A Digital Video Primer
Updated and Enhanced: March 2004
A Digital Video Primer
An introduction to DV production, post-production, and delivery
from the Adobe
Digital Video Group
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Introduction
There’s a lot to know about the technology involved in video. There are entire industries focused on
the nuances of professional video including cameras, storage, and transmission. But there’s no need
to be intimidated by all this technology. As digital video (DV) technology has evolved, it has gotten
increasingly easier to produce high quality work with a minimum of underlying technical know-how.
This Primer isn’t going to tell you everything, but it will give you a foundation in the basics and help
get you on the road to creating your own video productions.
Contents
VIDEO BASICS ........................................................ 3
Digital video has come of age ........................ 3
Frame rates and fields ...................................... 4
Resolution .......................................................... 5
Aspect ratios ...................................................... 6
Video color systems.......................................... 7
Color sampling .................................................. 8
Video compression ........................................... 8
How compression works ................................. 9
DV25 compression ............................................ 9
MPEG-2 compression .....................................10
Getting video into your computer ..............11
Analog video connections ............................11
Digital video connections .............................12
DIGITAL VIDEO FORMATS/CAMCORDERS ......17
What is DV? ......................................................13
What makes DV better than analog? ..........13
Is DV perfect? ...................................................13
DV variations....................................................14
Camcorder basics ............................................14
A d o b e
D i g i t a l
V i d e o
CONFIGURING YOUR SYSTEM ..........................17
The CPU .............................................................17
How much RAM do you need? .....................18
How much speed do you need? ...................18
How much storage do you need? ................18
Do you need a video capture card?.............19
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THE CREATIVE PROCESS ....................................20
An overview of movie-making .....................20
Preproduction..................................................20
Production ........................................................21
Post-production ..............................................21
ACQUIRING SOURCE MATERIAL .......................23
Capturing analog video .................................23
DV without delay ............................................23
Color without compromise ...........................24
Batch capture ...................................................24
Importing still images ....................................24
Importing computer graphics ......................25
Capturing audio ..............................................25
NONLINEAR EDITING ........................................26
Getting to know NLE tools ...........................26
Staying organized ..........................................27
Looking for approval? ...................................28
Preparing your assets....................................28
Putting the pieces together .........................29
Making transitions .........................................32
Adding effects ................................................32
More ways to enhance productions ...........33
Marking time ..................................................33
Merging creativity and productivity ..........34
Titles, graphics, and credits ..........................34
DIGITAL AUDIO FOR VIDEO .............................36
Digital audio basics .......................................36
Sweetening and mixing audio ....................36
More sophisticated audio production .......37
EFFECTS AND MOTION GRAPHICS .................39
Do I really need effects and
animation tools? ............................................39
New opportunities .........................................39
Why choose Adobe® After Effects®? ..........39
Build on your Adobe product skills ............39
Video compositing ........................................41
Animating ........................................................42
Adding effects ................................................43
Using expressions ..........................................45
GETTING VIDEO OUT OF
YOUR COMPUTER ..............................................46
Good housekeeping ......................................46
Exporting to videotape.................................47
Exporting to digital files ...............................47
Web video ........................................................47
Making DVDs ..................................................47
CONCLUSION ......................................................48
HOW TO PURCHASE ADOBE
SOFTWARE PRODUCTS .....................................48
FOR MORE INFORMATION ...............................49
GLOSSARY OF TERMS .......................................52
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Figure 1: Video signals
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VIDEO BASICS
Digital video has come of age
One of the first things you should understand is the difference between analog and
digital video (Figure 1):
Analog signal
Digital signal
Binary signal
Figure 2: Noise
Analog signal with noise
Digital (binary) signal with noise
A d o b e
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DTV COMES IN TWO FLAVORS
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• Standard Definition Television (SDTV)
offers resolution roughly equivalent to
a conventional analog signal (525 lines
of vertical resolution for NTSC). It can
have a 4:3 or a 16:9 aspect ratio.
• High Definition Television (HDTV)
offers the potential for approximately
twice the horizontal and vertical resolution of current analog (NTSC) television.
When combined with the compulsory
6:9 widescreen format, this can result
in about five times as much visual
information as analog TV. It also takes
approximately five times the bandwidth
to broadcast as SDTV.
• Analog signals are made up of continuously varying waveforms. In other words, the
value of the signal, at any given time, can be anywhere in the range between
the minimum and maximum allowed.
• Digital signals, by contrast, are transmitted only as precise points selected at intervals on the curve. The type of digital signal that can be used by your computer is
binary, describing these points as a series of minimum or maximum values—the
minimum value represents zero; the maximum value represents one. These series
of zeroes and ones can then be interpreted at the receiving end as the numbers
representing the original information.
There are several benefits to digital signals. One of the most important is the very high
fidelity of the transmission, as opposed to analog. With an analog signal, there is no way
for the receiving end to distinguish between the original signal and any noise that may
be introduced during transmission. And with each repeated transmission or duplication,
there is inevitably more noise accumulated, resulting in the poor fidelity that is attributable
to generation loss. With a digital signal, it is much easier to distinguish the original
information from the noise. So a digital signal can be transmitted and duplicated
as often as we wish with no loss in fidelity (Figure 2).
The world of video is making a clear transition from analog to digital. This transition is
happening at every level of the industry. At home and at work, viewers watch crystal
clear video delivered via digital versatile discs (DVDs). In broadcasting, standards have
been set and stations are moving towards digital television (DTV). The majority of U.S.
households receive digital cable or digital satellite signals. But the transition is still
going to take some time. No one expects consumers to suddenly throw away all their
old analog-based TV sets and buy all new digital TVs. Although some digital content
is now available, TV programming is still, for the most part, engineered for analog
broadcast and viewing—that is, set top boxes convert the digital cable or satellite signal
back to the analog NTSC standard (in the U.S.) before sending the signal to the TV set.
Nonetheless, the U.S. Government has mandated a full conversion of American television broadcasting to DTV by 2006, to make better use of available bandwidth.
The transition to digital television, as well as developments in DVD technology, will
make high-definition (HD) content widely available. TV sets currently on the market
are not all HDTV-capable or -ready—even the Widescreen (16:9) TVs. But virtually all
new sets today are, at least, SDTV-ready, meaning that they are equipped to accept a
digital signal directly (although most also include analog inputs). This means we can
connect DV camcorders, digital VCRs, and DVD players to our new digital TV sets via
IEEE 1394 or DVI to achieve a pristine, noiseless picture.
Even high-end filmmaking is conceding to digital. Today viable HD digital video formats are delivering magnificent quality for both high-end motion pictures and broadcast TV. Many major motion pictures consist largely of digitally-generated or enhanced
footage anyway. And for those who prefer that grainy quality that's characteristic of
film, there are digital effects that can impart convincing graininess to the impeccably
clean images made possible by HD video—in fact offering directors more choices for
what type of grainy quality they prefer, as opposed to the what-you-get-is-what-you-get
grain that comes with film. While the continuous-tone contrast range of film is still
more incremental than even the highest definition video, there are many compelling
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Desktop video...
enables you to
work with moving
images in much the
same way you write
with a word
processor. Your movie
“document” can
quickly and
easily be edited and
reedited to your
heart’s content...
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arguments for shooting digitally, not the least of which is cost. Many independent film-makers used to
have to scavange leftover film remnants to complete a project; today the greater affordability of digital
video is making it possible for more indies to get produced and seen than ever before. In consumer
electronics, an ever-growing selection of digital video camcorders offers impressive quality at an
affordable price.
The standard for video post-production moved from analog tape-to-tape editing to the the world of
digital nonlinear editing (NLE) many years ago. The advantages of using a computer for video production activities such as nonlinear editing are enormous. Traditional tape-to-tape editing was like writing
a letter with a typewriter. If you wanted to insert video at the beginning of a project, you had to start from
scratch. Desktop video, however, enables you to work with moving images in much the same way you
write with a word processor. Your movie document can quickly and easily be edited and reedited to
your heart’s content, including adding music, titles, and special effects.
Frame rates and fields
When a series of sequential pictures is shown to the human eye, an amazing thing happens. If the
pictures are shown rapidly enough, instead of seeing each separate image, we perceive a smoothly
moving animation. This is the basis for film and video. The number of pictures shown per second is
called the frame rate. It takes a frame rate of about 10 frames per second for us to perceive smooth
motion. Below that speed, we notice jerkiness. The movies you see in a theatre are filmed and projected
at a rate of 24 frames per second. The video you see on television is approximately 30 frames per second
(29.97 fps) in the U.S. and other countries where the standard is NTSC video; in Great Britain and parts
of Europe, Africa, Asia, and the Middle East, where PAL is the standard, the frame rate is roughtly 25
frames per second.
A d o b e
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But frame rate is just one of the differences between film and video. The methods by which film and
video were originally displayed has made them quite different, as well. Film is traditionally displayed
by projecting a focused beam of light through each sequential frame to cast a complete image of that
frame onto a screen—one frame after another. This progressive method of displaying complete frames
is similar to the manner in which a computer display is refreshed—the whole screen lights up with a
persistent image until the display is refreshed again. The new digital television sets are also capable of
progressive display.
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But in a standard television set, an electron beam scans across the inside of the screen, striking a
phosphor coating. The phosphors give off the light we see. The intensity of the beam controls the intensity of the released light. It takes a certain amount of time for the electron beam to scan across each line
of the television set before it reaches the bottom and returns to begin again. When televisions were first
invented, the phosphors available had a very short persistence (that is, the amount of time they could
remain illuminated). Consequently, in the time it took the electron beam to scan to the bottom of the
screen, the phosphors at the top were already going dark. To contend with this limitation, the early
television engineers designed an interlaced system. This meant that the electron beam would only scan
every other line the first time, and then return to the top and scan the intermediate lines. These two
alternating sets of lines are known as the upper (or odd) and lower (or even) fields in the television
signal. Therefore a television that is displaying 30 frames per second (actually 29.97) is really displaying
60 fields per second (truly 59.94)—two interlaced images comprising each frame.
Why is the frame/field issue of importance? Imagine that you are watching a video of a ball flying across
the screen. In the first 1/60th of a second, the TV paints all of the even lines in the screen and shows the
ball in its position at that instant. Because the ball continues to move, the odd lines in the TV that are
painted in the next 1/60th of a second will show the ball in a slightly different position. If you are using a
computer to create animations or moving text, then to achieve smooth motion, your software must calculate images for two interlaced fields for each frame of video. The frames/fields issue is only of concern
for video that will be displayed on standard televisions. If your video is going to be displayed progressively—on computers or digital TVs—there is no issue. In any case, if you are using Adobe Premiere®
Pro software for video editing or Adobe After Effects software for creating motion
graphics and visual effects, the frame/field issue will be handled correctly.
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THE PROMISE OF 24P
Frame rate differences and video interlacing complicate
the process of translating film to video when motion pictures are to be shown on TV, or when converting NTSC
video to PAL or vice versa; the worst case is converting
footage shot as interlaced video to film. At best, standards
conversion (that is, converting from one format to another)
causes motion artifacts and softens crisp images.
A d o b e
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V i d e o
The advent of digital television has underscored the need
for a better way to move between formats—in the U.S.,
the digital television mandate by the FCC allows broadcasters to choose from any of 18 different SD (standarddefinition) and HD (high-definition) formats. These formats are specified with a number indicating the lines of
vertical resolution, and a letter—either “i” or “P”—indicating whether the display is interlaced or progressive. CBS
and NBC have chosen 1080i; ABC prefers 720P; and FOX
will work with 480P, as well as with 480i and 720P. Sounds
like the commencement of chaos, doesn't it? Imagine the
poor producer who must be prepared to deliver in any
one of these 18 formats or in multiple formats.
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The term telecine refers to the combination of process, equipment,
and software used to perform film to video conversion. Pulldown
techniques are used in telecining to get the 24 frame-per-second rate of
film up to the approximately 30 frame-per-second rate of NTSC video
(or the 25 fps rate of PAL) and to handle the conversion from progressive frames to interlaced fields. The pulldown part of the pulldown
process refers to slightly slowing down the 24 frames-per-second rate
of film so that when the frames are allocated to fields, the result is the
correct number of fields per second for the video format (60 fields per
second for NTSC; 50 fields per second for PAL). Cadence refers to the
allocation scheme of frames to fields: 2-3 pulldown and 3-2 pulldown
methods allocate one film frame alternatively to 2 fields, then the next
to 3 fields or vice versa, ultimately yielding the 60 frames per second
required for NTSC video; 2-2 pulldown allocates each film frame to 2
fields, yielding the 50 frames per second required for PAL (the math
for 2-2 pull-down doesn't quite work out, and so film converted to
PAL runs 4 percent faster than normal).
Although pulldown techniques have their roots in film-to-video conversion, the cadence part of pulldown methodology is now also being
used for converting the high definition (HD) 24P (the “P” stands for
progressive) digital video that's being swiftly adopted for high-end
motion picture production, as well as for video, to 60i (the “i" is for
interlaced) to be displayed as standard, interlaced NTSC video.
Additionally, the benefits to the film industry of having a
suitable digital production format are enormous. Savings
on the cost of traditional film and film processing, not to
mention the time required for film processing are huge.
When digital effects are incorporated into footage, film
must be digitized anyway—being able to begin with
digital material makes sense.
Resolution
The solution may be 24P—a high definition (1080 lines
of vertical resolution), 24 fps, progressive-display video
format. 24P cameras are delivering major motion picture
quality material, as George Lucas proved shooting Star
Wars: Episode II digitally—with 24P. Plus film is easily
converted to 24P video, because it is 24 fps progressive
display to begin with. 24P allows you to make a single
digital master from which all the formats needed—from
NTSC or PAL, to any of the HD formats, even film—can be
produced, virtually without generation loss—because
it's digital.
Resolution for traditional analog video is represented by the number
of horizontal scan lines per image—that is, the number of lines the
electron beam draws across the screen—known as vertical resolution.
Don’t let the term vertical confuse you—the lines being counted are
actually in a horizontal orientation. Vertical resolution counts the
number of horizontal scan lines going from top to bottom.
“24P is the lingua franca of the new HD
world. It’s going to make the confusion of all
the proliferating standards simple and much
less expensive for the post-production community. More important, it offers the prospect of archiving a single master from which
any current (and possibly future) television
or theatrical delivery format can be derived.”
—Michael Buday
24P Primer, Editors Guild Magazine1
The quality of the images you see in film and video is not only dependent upon frame rate. The amount of information in each frame is also
a factor. This is known as the resolution of the image. All other things
being equal, a higher resolution will result in a better quality image.
• NTSC is based on 525 vertical lines of resolution—each interlaced
field comprised of 262 scan lines.
• PAL is based on 625 vertical lines or resolution—each interlaced
field comprised of 312 scan lines.
Horizontal resolution is the number of pixel across each scan line.
Horizontal resolution varies according to the capability of the video
recording device to record the dots and of the video playback device
and monitor to display them. Horizontal resolution for the VHS
format is only 250 lines, while horizontal resolution for DV and
DVD is 500 lines.
Resolution for digital images—on computer displays and digital television sets, for example—is represented by the number of individual
picture elements (pixels) that are on the screen, and is often expressed
as a number of horizontal pixels times the number of vertical pixels—
640x480 or 720x480 for example or, for a full-resolution HD image
1 www.editorsguild.com/newsletter/MayJun00/24p_Primer.html, “24P Primer: An Introduction to the Lingua Franca of the HD World,” by Michael Buday,
Editors Guild Magazine, copyright 2000
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on a 16x9 screen, 1920x1080. In the U.S., the FCC has approved 18 different standards for digital TV.
Currently, the three most commonly encountered are 480p* (480 lines of vertical resolution scanned
progressively—that is, refreshing all at once), 720p (720 lines of vertical resolution scanned progressively), and 1080i (1080 lines, interlaced).
Another factor to be aware of regarding resolution on digital TVs is the physical size of the screen—
there are more dots placed horizontally across a 50-inch plasma screen than on a 27-inch direct-view
screen. Although a 1080i image may be fed to an HDTV display, that display may not be able to reproduce all the dots comprising the lines in the image received. Digital TVs will reprocess (upconvert or
downconvert) the image to conform to the number of dots actually available on the screen. A 1080i
image created for HDTV with a resolution of 1920x1080 may be scaled to fit 1366x768, 1280x960,
1024x768, or any other pixel field—and this will, as may be expected, result in a loss of detail.
You may find yourself working with a wide variety of frame rates and resolutions. For example, if you
are producing a video that is going to be shown on VHS tape, DVD, and the Web, then you are going to
be producing videos in three different resolutions and at three different frame rates. The frame rate and
the resolution are very important in digital video because they determine how much data needs to be
transmitted and stored to view your video. There will often be trade-offs between the desire for great
quality video and the requirements imposed by storage and bandwidth limitations.
Better quality
Higher frame rate
Greater resolution
More data
More storage
More bandwidth
Aspect ratios
The width-to-height ratio of an image is termed its aspect ratio. The 35mm still photography film
frames on which motion picture film was originally based have a 4:3 (width:height) ratio, which is often
expressed as 1.33:1 or, simply, a 1.33 aspect ratio (multiplying the height by 1.33 yields the width).
Figure 3: Aspect ratios
For the 60 years from 1917 to 1952, the 4:3 image area aspect ratio was used almost exclusively to make
movies and to determine the shape of theatre screens. When television was developed, existing camera
lenses all used the 4:3 format, so the same aspect ratio was chosen as the standard for the new broadcast
medium. This 4:3 format is now known as fullscreen TV.
For many years, when widescreen films were shown on television, the sides of the image
were lopped off to accommodate the aspect ratio of the TV set. Eventually, letterboxing
came into vogue, whereby black bars were positioned above and below the widescreen
image, in order fit the full width of the image on the TV screen.
Today, as a result of the popularity of letterboxed films on DVD and broadcast TV, combined with the new HDTV standard that specifies a widescreen format, widescreen TVs
are available that are designed to accommodate widescreen content. The aspect ratio of
widescreen TV is 16:9 (1.78), which is well-suited to accommodate the now-standard film
aspect ratio of 1.85.
D i g i t a l
Fullscreen TV = 4:3 (1.33)
Widescreen TV = 16:9 (1.78)
A d o b e
V i d e o
In the 1950s, the motion picture industry began to worry about losing audiences to broadcast television. So the movie studios began to introduce a variety of different enhancements to guarantee audiences a bigger, better, and more exciting experience than they could have in their own living rooms.
One of these enhancements was the widescreen format, aka scope—Cinemascope (the original),
Warnerscope, Technicscope, Panascope, and others. Audiences liked widescreen and, as the technology developed, the standard adopted for most films had an aspect ratio of 1.85.
* Note that when the letter “P” is used to denote progressive in the 24P video format, it is capitalized; but when it is used in referring to television display, it is typically lower case.
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Broadcast standards including the 18 DTV options authorized in the U.S. by the FCC
Signal
NTSC
Aspect
Ratio
Horizontal
Resolution
Vertical
Resolution
(pixels/line)
(scan lines)
4:3
330
4:3
330
4:3
330
HDTV
16:9
1920
HDTV
16:9
1280
(USA, Canada, Japan, Korea, Mexico)
PAL
(Australia, China, most of Europe, South America)
SECAM
(France, Middle East, much of Africa)
SDTV
SDTV
SDTV
16:9
4:3
4:3
720
720
640
525
Frame
Rate
(interlaced or
progressive)
Bit
Rate
30i
N/A
25i
N/A
25i
N/A
1080
24p
30p
30i
18 Mbps
18 Mbps
18 Mbps
720
24p
30p
60p
8 Mbps
10 Mbps
18 Mbps
483
24p
30p
30i
60p
3 Mbps
4 Mbps
4 Mbps
8 Mbps
486
24p
30p
30i
60p
3 Mbps
4 Mbps
4 Mbps
7 Mbps
480
24p
30p
30i
60p
3 Mbps
3 Mbps
3 Mbps
7 Mbps
(480 visible)
625
(576 visible)
625
(576 visible)
Video color systems
A d o b e
D i g i t a l
V i d e o
Most of us are familiar with the concept of RGB color, referring to the red, green, and blue
components of a color. Our computer monitors display RGB color. Each pixel we see is actually
the product of the light coming from a red, a green, and a blue phosphor placed very close together.
Because these phosphors are so close together, our eyes blend the primary light colors so that we
perceive a single colored dot. The three different color components—red, green, and blue—
are often referred to as the channels of a computer image.
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Computers typically store and transmit color with 8 bits of information for each of the red, green, and
blue components. With these 24 bits (that is, 2 raised to the 24th power) of information, over a million
different variations of color can be represented for each pixel. In the computer world, this type of representation is known as 24-bit color; in the video industry, it’s equivalent to 8-bit-per-channel color.
While 8-bit-per-channel color is commonly used, today's high performance equipment often delivers
higher quality color. An 8-bit number (28) has 256 possible values, while a 10-bit number (210) has
1024 levels. 10-bit-per-channel color has the potential for providing as much as four times the color
resolution as 8-bit color. If you are concerned with the very highest quality output, you can work in
16-bit-per-channel color in Adobe After Effects software. When you work with high-resolution images
that use a narrow range of colors, such as when you’re creating film effects or output for HDTV, the
difference is easily visible: transitions between colors are smoother with less visible banding, and more
detail is preserved.
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Like computer monitors, televisions also display video using red, green, and blue phosphors. However,
television signals are not transmitted or stored in RGB. Why not?
When television was first invented, it worked only in black and white. The term black and white is
actually something of a misnomer because what you really see are the shades of gray between black
and white. That means that the only piece of information being sent is the brightness (known as the
luminance) for each dot.
When color television was being developed, it was imperative that color broadcasts could be viewed
on black-and-white televisions (in black and white, of course, not color), so that millions of people
didn’t have to throw out the sets they already owned. Rather, there could be a gradual transition to the
new technology. So, instead of transmitting the new color broadcasts in RGB, they were (and still are)
transmitted in something called YUV (YUV is usually the term used in analog video; YCC is the term
used primarily in the digital realm, shortened from YCrCb). The Y is the same old luminance signal that
was used by black-and-white televisions, while the U and V (or the two Cs) stand for the color components. The two color components determine the hue of a pixel, while the luminance signal
determines its brightness.
Color sampling
When working with RGB images, we use exactly the same number of bits to store the three color
components. When working with YCC video, however, we take advantage of the peculiarity of human
perception previously mentioned—the eye is much more sensitive to changes in the luminance of an
image than to the color (known as chrominance). So, instead of storing the same amount of information for each of the YCC components, broadcast-quality video only needs to store half as much color
information as it does luminance information. This is also known as 4:2:2 color, which means that for
every four samples of luminance values, there are only 2 samples of each color signal (see Figure 4).
This helps save bandwidth during transmission, as well as storage space.
In technical terms, the NTSC broadcast specifications call for video to provide 8-bit samples at 13.5
MHz with a 4:2:2 sampling ratio. What does all that mean?
Figure 4: Color sampling
= Luminance
= Chrominance
• 4:2:2 is the ratio between the luminance (Y) and color (Cr and
Cb) samples. It means that for every four samples of the luminance (Y) component, two samples of each of the two color
components (Cr and Cb) are taken—360 samples per scan line.
4:4:4 color (uncompressed)
4:2:2 color (broadcast quality)
D i g i t a l
4:1:1 (consumer/prosumer/professional nonbroadcast)
YCC can be reduced even further to what is known as 4:1:1 color,
in which for every four samples of the luminance (Y) component,
one sample of each of the two color components (Cr and Cb) are
taken—180 samples per scan line. 4:1:1 color provides adequate
quality for most consumer/prosumer (that is, nonbroadcast) needs.
The reduced information in 4:1:1 color is not a problem in most
usages, but it can cause issues such as visual artifacts around
composited images.
You may also encounter 4:2:0 color. This notation does not mean that the second chroma (Cb) is not
sampled—in 4:2:0 color, chrominance is sampled 360 times per scan line (like 4:2:2 color), but only
on every other line of each field—a sort of half sampling. 4:2:0 color is specified for PAL broadcast
video and is one of the reasons that PAL does not translate well to NTSC.
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• 13.5 million times per second, an 8-bit (2 raised to the 8th
power, that is, a 256-level) reading of the black-and-white—
that is, the luminance (Y)—component is taken.
Video compression
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Whether you use a capture card or a digital camcorder, in most cases, when your video is digitized it will
also be compressed. Compression is necessary because of the enormous amount of data that comprises
uncompressed video.
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It takes over 1.5 GB
(gigabytes) to hold a minute
of uncompressed video!
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A single frame of uncompressed video takes about 1 megabyte (MB) of space to store.
You can calculate this by multiplying the horizontal resolution (720 pixels) by the vertical
resolution (486 pixels), and then multiplying by 3 bytes for the RGB color information. At
the standard video rate of 29.97 frames per second, this would result in around 30 MB of
storage required for each and every second of uncompressed video! It would take over 1.5
gigabytes (GB) to hold a minute of uncompressed video! In order to view and work with
uncompressed video, you would need an extremely fast and expensive disk array, capable
of delivering that much data to your computer processor rapidly enough.
The goal of compression is to reduce the data rate while still keeping the image quality high. The amountof
compression used depends on how the video will be used. The popular DV25 format compresses at a 5:
1 ratio (i.e. the video is compressed to one-fifth of its original size). Video you access on the Web might
be compressed at 50:1 or even more.
How compression works
There are many different ways of compressing video. One method is to simply reduce the size of
each video frame. A 320x240 image has only one-fourth the number of pixels as a 640x480 image.
Or we could reduce the frame rate of the video. A 15 frame-per-second video has only half the data
of a 30 frame-per-second video. These simple compression schemes won’t work, however, if we want
our video to be displayed on a television monitor at full resolution and frame-rate. What we need
is another way of approaching the compression problem.
It turns out that the human eye is much more sensitive to changes in the luminance of an image than
to changes in the color. Almost all video compression schemes take advantage of this characteristic of
human perception. These schemes work by discarding much of the color information in the picture.
As long as this type of compression is not too severe, it is generally unnoticeable. In fact, in even the
highest quality uncompressed video used by broadcasters, some of the original color information
has been discarded.
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When each frame of video is compressed separately, the type of compression is known as intraframe or
spatial compression. Conversely, some video compression systems utilize what is known as interframe
or temporal compression. Interframe compression takes advantage of the fact that any given frame of
video is probably very similar to the frames around it. So, instead of storing entire frames, we can store
just the differences between certain frames.
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The compression and decompression of video is handled by something called a codec. Codecs may
be found in hardware—for example, in DV camcorders or capture cards — or in software. Some codecs
have a fixed compression ratio and therefore a fixed data rate. Others can compress each frame a different
amount depending on its content, resulting in a data rate that can vary over time. Some codecs let you
choose a quality setting that controls the data rate. Such adjustable settings can be useful in editing. For
example, you may wish to capture a large quantity of video at a low-quality setting to generate a rough edit
of your program, and then recapture just the bits you want to use at a high-quality setting. This lets you
edit large quantities of video without needing a drive large enough to hold the entire set at high-quality.
DV25 compression
DV25 is the compression format used for the standard DV format employed by most consumer and
prosumer camcorders. DV25 is compressed at a fixed rate of 5:1 and delivers 25 Mbps (million bits per
second) of video data. Audio and control information is also included, so the total data rate is about
3.6 million bytes (megabytes—MB) per second. This means that one hour of DV25-compressed footage will require about 13 billion bytes (gigabytes—GB) of storage. It is impressive to realize that each
60-minute mini-DV cassette is actually 13 GB of offline storage! DV25 compression uses 4:1:1 color sampling. The audio is uncompressed, and there are two stereo audio pairs. The audio can be digitized at
either 12 bits at a sampling rate of 32kHz or 16 bits at a sampling rate of 44kHz or 48kHz. You should
generally use the highest quality (16 bit, 48kHz) setting.
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OTHER FORMS OF MPEG
MPEG-1, limited to a 352x240-pixel
frame size, was the first MPEG standard
established and is still used for CD-ROMs,
video CD (VCD), and some Web video.
The specifications for MPEG-3 were
abandoned, as the industry moved on to
complete MPEG-4. (Note that MP3—
which stands for MPEG-1, Layer 3—is an
audio-only compression format and should
not be confused with MPEG video formats).
MPEG-4, which is currently in use in the
latest releases of the QuickTime and
Windows Media architectures, facilitates
streaming video on the Web and over
wireless networks, as well as providing
mechanisms for multimedia interactivity.
MPEG-4, with its lower-bit-rate approach,
may be adopted for HD-DVD.
The names MPEG-5 and MPEG-6 will
not be used; the next release is expected
to be MPEG-7, which will not advance
compression but will focus on the incorporation of “metadata,” enabling
sophisticated indexing and retrieval
of multimedia content.
MPEG-21, also in the planning stages,
is an iteration that is expected to create
a complete structure for the management and use of digital assets, incorporating e-commerce capabilities that will
make sharing creative products more
commercially viable.
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MPEG-2 compression
MPEG stands for the Motion Pictures Expert Group, an organization of film and
video professionals involved in establishing industry standards; 2 refers to “compression standard version 2.” MPEG-2 can provide extremely high-quality video. Readily
supporting data rates in excess of 8 Mbps (equivalent to 1 MB per second), MPEG-2
is ideal for DVD, with its high-end data rate of 9.8 Mbps, and is also the format currently received by home satellite dishes. So why isn’t everything in MPEG-2? MPEG2 started out as an excellent distribution format but was, initially, less useful for direct
recording and editing of video because, from a video-editing standpoint, it was difficult to work with. But over the past few years, the technology has advanced so that
MPEG-2 has become a viable compression format both for recording and for editing
video.
The MPEG-2 video format includes a sophisticated codec that performs both
intraframe (aka spatial) compression and interframe (aka temporal) compression.
• Intraframe compression reduces the amount of data within individual frames,
by removing color information that will be undetectable by the human eye.
• Interframe compression reduces the amount of data by replacing some frames
with mathematical predictions or interpolations based on preceding and
(sometimes) following frames.
MPEG-2 compression generates three different types of frames:
• I frames (which serve as the keyframes in MPEG-2) take advantage of
intraframe compression, reducing the amount of information within the individual frames through color sampling. I frames preserve more information
than P or B frames and are, therefore, the largest, in terms of the amount of
data needed to describe them.
• P frames are predicted frames, computed from previous frames, and may
require less than a tenth of the data needed for I frames.
• B frames, or bi-directional frames, are interpolated from both previous frames
and those that follow. B frames can be even smaller than P frames.
A typical MPEG-2 sequence might look something like this:
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IBBPBBPBBPBBPPB
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How each frame is compressed depends on the type of content. If the content is fairly static—for
example, a talking head shot against a plain, still background—where not much changes from frame to
frame, then few I frames will be needed, and the video can be compressed into a relatively small amount
of data. But if the content is action-oriented—for example, a soccer game, where either the action or
the background moves or changes rapidly or dramatically from frame to frame—then more
I frames are required, a greater amount of data is needed to maintain good quality and, therefore, the
video cannot be compressed as much.
While MPEG-2 is an excellent compression choice for distribution, it is rarely employed while editing
video. Relying on relatively complex algorithms for its sophisticated combination of intraframe and
interframe compression, it just isn’t very practical because most MPEG-2 codecs take much longer to
compress video than they do to decompress it. Perhaps it’s even easier to understand why MPEG-2 is a
poor choice for editing when you think about specific situations. Say, for example, that you wanted to
edit frame number 128 of your video. If frame number 128 is a P frame, the editing system might have
to read frames 124, 125, 126, and 127 to compute what frame 128 actually looks like. Or what if you
want to remove frame number 556, which happens to be an I frame? P and B frames that rely on the
data describing frame number 556, may not be able to be completely recreated. So, depending on your
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KNOW YOUR CABLES
AND CONNECTORS
If you are new to video, figuring out all of
those audio and video cables and connectors can be as difficult as untangling a bowl
of spaghetti one noodle at a time. This chart
is intended to help.
The pictured connectors (two audio—XLR
and RCA—and three video) are all male;
female counterparts also exist.
XLR
RCA
BNC
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S-Video
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XLR connectors are used
to connect microphones
and other balanced
audio devices and for
the AES/EBU digital
audio connection.
An RCA connector is also
called a phono plug and
is often used to connect
consumer audio and
video equipment like
VCRs, tuners, and
CD players.
BNC, which stands for
baby N connector, is
used to connect various
video sources, including analog composite,
analog component, and
serial digital video interface (SDI).
The S-Video connector
connects S-Video equipment, like S-VHS camcorders and video disks.
In video, IEEE 1394
is used toconnect a
camcorder or digital
tape recorder to
a computer’s
IEEE 1394 port.
IEEE 1394
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video editing system and how ambitious your editing plans are, you might do
some very basic editing to MPEG-2 video, but you will probably want to do
most of your video editing before applying MPEG-2 compression.
It is important to note that not all MPEG-2 codecs are the same. MPEG-2 is
not a patent; it is a set of standards—that is, specifications that must be met for
the codec to qualify as MPEG-2 and for the encoding and decoding sides of the
process to mesh. Codec developers have created and continue to create a wide
variety of applications based on MPEG standards, some more eloquent or
efficient than others. This is most significant when considering the encoding
side of the process, which can greatly impact the quality of the resulting
decoded video. So long as the standard continues to be MPEG-2, the decoder
chip in players will not need to change to yield better quality for video that
has been compressed with better encoding technology.
Getting video into your computer
Because your computer only understands digital (binary) information, any
video with which you would like to work will have to be in, or be converted to,
a digital format.
• Analog: Traditional (analog) video camcorders record what they “see and
hear” in an analog format. So, if you are working with an analog video
camera or other analog source material (such as videotape), then
to get your source material into the computer, you will need a video
capture device that can digitize the analog video. This will usually be a
video capture card that you install in your computer. A wide variety of
analog video capture cards are available. The differences between them
include the type of video signal they can digitize (such as composite or
component), as well as the quality of the digitized video. The digitization
process may be driven by software such as Adobe Premiere Pro. Once the
video has been digitized, it can be manipulated in your computer with
Adobe Premiere Pro and Adobe After Effects, or other software. After
you are done editing, you can then produce your final video for distribution—exporting a digital format, or recording to an analog format like
VHS or Beta-SP.
• Digital: Digital video camcorders have become widely available and
affordable for both consumers and for professionals. Digital camcorders
translate what they record into digital format right inside the camera. So
your computer can work with this digital information as it is fed straight
from the camera via a digital interface such as IEEE 1394 or SDI.
A few words about analog video connections
The music industry has already converted to digital—most music today is
mastered, edited, and distributed in digital form (primarily via CD or the Web).
It won't be so very long before all video is digital as well. While the change is
clearly happening, it doesn’t mean that you can ignore the analog video world.
Many professional video devices are still analog, as well as tens of millions of
consumer cameras and tape devices. You should understand some of the basics
of analog video.
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Because of the noise concerns mentioned on page 3 of this Primer, in analog video the connection between
devices is extremely important. There are three basic types of analog video connections. Typically, the
higher the quality of the recording format, the higher the quality of the connection type.
• Composite (used for VHS format): The simplest type of analog connection is the composite
cable. This cable uses a single wire to transmit the video signal. The luminance and color signal
are composited together and transmitted simultaneously. This is the lowest quality connection
because of the merging of the two signals.
• S-Video (used for S-VHS and Hi-8 formats): The next higher quality analog connection is called
S-Video. This cable separates the luminance signal onto one wire and the combined color signals
onto another wire. The separate wires are encased in a single cable.
• Component (used for Beta-SP format): The best type of analog connection is the component
video system, where each of the YUV signals is given its own cable.
Making digital video connections
Whichever interface you use for getting digital video into your computer from your camcorder or from
any digital video recording device, it's as simple as “plug-and-play.”
• IEEE 1394: Originally developed by Apple Computer, IEEE 1394 is the most common form of
connection used by standard DV camcorders. Also known by the trade names FireWire® (Apple
Computer) and i.LINK (Sony Corporation), this high-speed serial interface currently allows up to 400
million bits per second to be transferred (and higher speeds are coming soon). If you are living in
the Stone Age and your computer did not come with an IEEE 1394 port built in, then you can purchase an inexpensive card that provides one. The single IEEE 1394 cable transmits all of the information, including video, audio, timecode, and device control (letting you control the camera from
the computer). IEEE 1394 is not exclusively used for video transfer; it is a general purpose digital
interface that can also be used for other connections, such as to hard drives or networks.
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• SDI: Serial Digital Interface (SDI) is the high-end professional connection for digital video.
It was originally meant for SD, but it is now also used for HD transport. SDI is typically only
supported in high-end gear, although the price is dropping dramatically.
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DIGITAL VIDEO FORMATS AND CAMCORDERS
What is DV?
DV is often used to connote digital video in general... However...
DV has typically been used to refer to a specific digital video format based on DV25 compression that
primarily addresses the consumer and prosumer markets. The tape cassettes for this standard DV format
come in two sizes: one about the size of an audio cassette; the other—mini-DV—about half that size.
Standard DV records a standard-definition (SD), interlaced signal using DV25 compression (that's 5:1
compression with a bit rate of 25Mbps). For NTSC, the color sampling is 4:1:1; for PAL, it’s 4:2:0.
So, when someone refers to a standard DV camcorder, they are usually talking about a digital video
camcorder that uses mini-DV tape, records in the standard DV format using DV25 compression, and
has a port for connecting to a computer via the IEEE 1394 interface. DV camcorders are used by
consumers, prosumers, and even professionals shooting nonbroadcast quality material (for example,
events like weddings, meetings, and so forth.)
But... the world of digital video can be confusing, when it comes to terminology. As you'll learn reading
on, there are also variations of DV that refer to professional and broadcast-quality formats.
What makes DV better than analog video?
There are many benefits to the standard DV format, particularly when compared to analog devices like
VHS decks or Hi-8 cameras:
• Superior images and sound: A DV camcorder can capture much higher quality video than other
consumer video devices. DV video provides 500 lines of vertical resolution (compared to about
250 for VHS), resulting in a much crisper and more attractive image. Not only is the video resolution better, but so is the color accuracy. DV sound, too, is of much higher quality. DV can provide
better-than-CD quality stereo sound recorded at 48Khz with a resolution of 16 bits.
• No generation loss: Since the connection to your computer is digital, there is no generation loss
when transferring DV. You can make a copy of a copy of a copy of a DV tape, and it will still be as
good as the original.
• No need for a video capture card: Because digitization occurs in the camera, there is no need for
an analog-to-digital video capture card in your computer.
• Better engineering: The quality of the DV videotape is better than for analog devices. Plus, the
smaller size and smoother transport mechanism of the tape means DV cameras can be smaller
and have more battery life than their analog counterparts.
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Is DV perfect?
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While DV isn’t perfect, it is
certainly the highest-quality,
most cost-effective video format
ever made available to the
average consumer.
The image quality of the DV format has been tested by both human and mechanical
means. This testing ranks DV quality on par with Beta-SP, which has been the mainstay
for professional video production for decades. But DV is not perfect.
Because the video is compressed, it is possible for there to be visible degradations—
known as compression artifacts. These artifacts result from the color compression and
will be most noticeable around sharp color boundaries like white text on a black background. The 4:1:1 reduced color sampling in DV compression can also cause issues when
performing professional compositing.
Additionally, compression does add noise to the picture. If DV is repeatedly decompressed
and then recompressed, it will begin to degrade. This is different from just transmitting DV from generation to generation, which is lossless. Technology is advancing rapidly, and even now there are video
boards available that make it possible to edit and composite uncompressed video on the desktop. But,
for most editing uses, you won’t do many compression/decompression cycles, and so any degradation
that may result from DV compression will be unnoticeable.
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While DV isn’t perfect, it is certainly the highest-quality, most cost-effective video format ever made
available to the average consumer and to many professionals. The entire video industry is being
transformed by the low cost and high quality of the DV solution.
WHAT’S HDV?
Is it HD for the masses?
In October of 2003, four leading video
equipment manufacturers (Canon, Sharp,
Sony, and JVC) finalized the specification
for a new consumer/prosumer digital
video format that will record and play
back HD video on standard and mini-DV
cassettes. JVC introduced a single CCD
camcorder based on the new high-definition format—for under $3,500 (US).
HDV uses MPEG-2 compression to record
720p (progressive) and 1,080i (interlaced)
HD formats, supporting frame rates of
25p, 30p, 50p, and 60p for 720p at a data
rate of 19Mbits/sec, and 50i and 60i
for 1080i at a data rate of 25 Mbits/sec.
Audio is recorded using 16-bit, 48kHz,
MPEG-1 Audio Layer-2 encoding at
384kbps.
Although the size of the picture is larger
(1280x720 for 720p and 1440x1080 for
1,080i), the actual resolution is about the
same as standard DV, using 4:2:0 color
sampling. Initial reports are enthusiastic,
claiming beautifully clear picture definition that’s free of MPEG artifacts.
DV variations
There are a many variations to the DV format, including but not limited to:
• Digital8: A prosumer-targeted variation on the DV25 theme is called Digital8. It
offers the same data rate and color sampling as DV25, but a slightly lower resolution. The Digital8 camcorder is designed to accommodate those customers who
want to move up to digital video, but who might have a significant investment in
analog Hi-8 movies. The Digital8 camcorder records digitally, but it can also play
back analog Hi-8 tapes.
• DVCAM and DVPRO or DVCPRO: Sony’s DVCAM and Panasonic’s DVPRO
use the same DV25 compression as DV, but record less video on each tape.
Putting less data on the tape makes the recording more durable and facilitates
better interchange between devices. Both the DVCAM and DVCPRO systems are
designed with the professional in mind for applications such as electronic news
gathering, and each offers distinct benefits for a particular customer type. The
tape and cassettes in which it is housed are more durable than standard DV or
mini-DV, and the gear is typically more rugged and higher quality overall, as well.
• DV50 aka DVPRO50 or DVCPRO50 and D-9 (Digital-S): Whereas DV25 indicates 25 Mbits/sec of video, DV50 indicates 50 Mbits/sec. The DV50 standard
offers 4:2:2 color sampling and lower compression than DV25, making the video
quality of this standard extremely high—suitable for the most demanding professional broadcast purposes. Variations allow for progressive, rather than interlaced, scanning.
• DV100 aka DVPROHD and D-9 HD: Used for HD (high definition) recording,
DV100 offers a data rate of 100 Mbits/sec and 4:2:2 color sampling.
• Digital Betacam aka DigiBeta or Betacam SX and IMX and HDCAM: With data
rates in excess of 100 Mbits/sec, these formats are based on the MPEG-2 rather
than on DV compression. These are the very-high-end broadcast professionals’
choices. They provide superior image quality, and the high-end equipment
required to work in these formats is commensurately costly.
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Camcorder basics
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In the digital realm, video cameras are known as camcorders. The line between consumer and professional can be somewhat blurry, but understanding the basics of camcorder technology will help you
make the best purchasing decision for your needs.
The better the lens, the better the quality. When it comes to optics, camcorders are similar to still
cameras, in that a better lens (and that usually means a more expensive one) makes for clearer, crisper
video. Lower-end, consumer-targeted DV camcorders have permanent lenses that are typically not
of the same high quality as professional video camcorder lenses. If you want the flexibility of interchangeable lenses, you’ll probably have to move up to a professional grade camcorder.
Optical vs. digital zoom. Whether fixed or interchangeable, most camcorder lenses offer zoom capability, letting you achieve more of a close-up view of your subject without actually moving the camera
closer. But you’ll want to know if the camcorder lens you’re getting offers true optical zoom, or only
digital zoom. For true optical zoom, the lens physically varies the focal length (measured in millimeters) by telescoping—the longer the focal length, the more of a close-up shot you can get. Optical zoom
results in clear focus (assuming the f-stop is set appropriately to achieve the depth of field you desire).
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WHAT’S ANAMORPHIC?
Cameras and camcorders record the
images that comprise film or video in the
standard 4:3 aspect ratio. If your video
camcorder has a switch to toggle between
the standard 4:3 and wide-screen 16:9,
aspect ratios, it may simply be masking
off (that is, letterboxing) the top and bottom of the image, as it records. If that is
the case, then 25% of the available pixels
are being used up for black bars above and
below the wide-screen image, meaning
that there are fewer pixels available to
store the actual image information. With
only 75% of the available pixels recording
essential information, your video will
suffer from a loss in resolution.
Anamorphic video, on the other hand,
uses all available pixels to store as much
video information as possible, so your
image resolution is as high as possible.
How does it work?
If your camcorder offers anamorphic 16:9,
or if you can get an anamorphic adapter,
then as the image is recorded, it is horizontally squeezed to fit the 4:3 space. When
the image is played back on a widescreen
TV, it will be stretched to appear normal.
To make post-production easy, Adobe
Premiere and After Effects support
anamorphic aspect ratios.
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Shot in 4:3 mode.
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Shot in nonanamorphic 16:9
mode, only 75% of
pixels are used.
In anamorphic
16:9 mode, all
pixels are used;
image is squeezed,
but looks right
when played back.
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Digital zoom, on the other
hand, is not really a zoom feature at all—it’s more of a
cropping feature that enlarges
a small area of the image to
simulate a close-up. As the
image is enlarged, so are
the pixels—what you get is
degraded quality. If you want
clarity, use optical zoom only.
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OK
1 1/4 CCD = 1 CCD with a small (1/4") chip
Good
1 1/3 CCD = 1 CCD with a large (1/3") chip
Very Good
1 2/3 CCD = 1 CCD w/ an extra large (2/3") chip
Excellent
3 1/4 CCD = 3 CCDs with small chips
Best
1 1/3 CCD = 3 CCDs with large chips
One CCD or three? CCD stands for charge-coupled device. CCDs detect the light coming
through the lens into a digital camcorder and convert it into electrical signals. The factors
that determine the quality of the resulting images are: size of the CCD chip, number of
active pixel elements, the number of CCDs, and the quality of the technology embedded in
the CCD circuitry. Camcorders with one CCD rely on a single sensor to capture light from
all three primary colors (red, green, and blue); those with three CCDs dedicate a sensor to
each color and are, therefore, able to produce better-quality images. Expect a significant
difference in price between 1-CCD and 3-CCD camcorders.
What about lux? A CCDs responsiveness to light also impacts video quality. Lux is a measure of illumination (that is, light) used to specify a camcorder’s low light responsiveness
limit and the amount of light recommended for achieving good quality. The more light required, the higher the lux. Some camcorders have infrared (IR) capabilities that will record
in 0 lux situations (for example, at night). You may also want to note a camcorder's signalto-noise ratio—a higher signal-to-noise ratio produces better quality images in low light
conditions, while a noisy signal typically records images that appear grainy or smudged.
Optical image stabilization is best. There are three kinds of image stabilization in handheld camcorders: optical, digital, and electronic. Optical image stabilization uses a system
of motion detectors and lenses to reduce the effects of vibration and camera movement.
Electronic and digital image stabilization merely manipulate the digital image and may
degrade video quality. If you plan to shoot your summer vacation and your kids’ soccer
games, no worries; but if you want professional quality, go for optical image stabilization.
Want to override automatic settings? Camera controls such as zoom, focus, audio gain,
white balance, exposure, and shutter speed are likely to be automatically adjusted in most
consumer camcorders. If you want to do more professional work, be sure your camcorder
lets you override automatic mode and manually adjust camera controls.
What about widescreen? Many camcorders let you toggle between standard 4:3 and
widescreen 16:9 modes. If widescreen is important to you, you probably want a camera
that handles anamorphic widescreen (read about anamorphic in the sidebar on this page).
Those little LCD screens are mighty small. If you plan to shoot professional-quality
video, you'll want a video output to support an external video monitor so you, your crew,
and possibly a client can really see what’s being shot.
Do you want progressive scan mode? DV camcorders with progressive scan mode are
becoming more sought-after. Obviously, if you want to shoot 24P (see the sidebar on 24P
on page 5 of this Primer), you’ll need progressive scan capability, but you’ll want to be sure
your progressive scan camcorder can also shoot at a full 29.97 fps. Progressive scan video
is better for desktop editing and digital delivery (DTV or computer viewing) because it
eliminates interlace artifacts. It’s also much better if you plan to capture still images from
your video.
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How about audio recording? The DV specification allows for up to four channels of 32 kHz, 12-bit audio
(that’s four mono tracks or two stereo tracks) or two channels of 48 kHz 16-bit audio (better-than-CD
quality). Most camcorders support both of these formats. If you want the best audio, you want an audio
level meter on your camcorder and the ability to control audio levels. You’ll also want a jack so you can
plug in high-quality headphones to monitor the audio.
Consumer camcorders accept a mini-plug microphone connector like the ones used for headphones with
portable radios. Such connectors are not shielded from outside line noise, so cables over 10 feet long are
prone to interference. Professional camcorders offer low-impedance, balanced-line inputs for a 3-pronged
XLR connector and shielded cables. Or you can get a mini-plug-to-XLR adapter that allows a professional
quality microphone to be used with a consumer-grade DV camcorders.
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Do you need analog in? Some digital camcorder models let you feed in existing analog video footage
(usually with an S-video connector), they digitize it, and then feed it back to your computer for editing.
With the analog in option in your camcorder, you don’t need a capture card in your computer to do analogto-digital capture—just feed the analog through your camera and into the computer via IEEE 1394.
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CONFIGURING YOUR SYSTEM
Whether you’re a professional or a hobbyist, choosing the right combination of software and hardware can be a tricky guessing game about what the future holds. You need to purchase enough power,
storage, and flexibility to meet your current needs, while being mindful that technology is inexorably
advancing, so you had better conserve enough capital to keep your systems current, as well as to fund
anticipated growth. Not long ago, the more money you threw at your system, the more capability you
bought. But the differences between results are ultimately becoming more a matter of the artist’s vision
than the cost of the system being used. Today, you can put together a powerful, desktop-based video
production setup for under $5,000. Here are a few more questions that should be considered:
What kind of video will you be putting into the computer? Will you only be working with DV footage?
Do you need to be able to edit footage captured in component or composite video? For example, many
industrial and broadcast users need to be able to capture and record video in the component
format for use with Beta-SP decks, in addition to DV. It would make little sense for such a user to
have a DV-only system. What about working with HD?
How time-critical will your productions be? When you add effects like transitions and titles to video,
they usually have to be rendered by the computer into their final form. This can take anywhere from
minutes to hours depending upon the complexity of your productions. If you are producing home
videos, then this isn’t much of a problem. But, if you have clients looking over your shoulder asking
for changes, then you might find it well worth your while to purchase a system that can produce these
effects instantly—in real time.
How much video will I be working with? Remember that one hour of standard DV video takes about
13 GB of disk storage. If you are producing a one-hour documentary, then you’ll want at least enough
storage for several hours of raw footage. You will often find yourself working with four or five times as
much raw footage as you will eventually use. If you are doing professional editing, you could be working with 20 or even 50 times the amount of final footage! Of course, you don’t need to have all of it
available at all times, but you will need to think about this when configuring your storage.
How will I distribute my finished video? Do you intend to distribute on film, in SD or HD, on VHS
tape, DVD, the Web?
The CPU
A d o b e
D i g i t a l
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It’s important that you choose a computer with a CPU (central processing unit) that’s powerful enough
to meet the demands your creative process will place on it. Post-production is all about processing and
moving huge amounts of data, while maintaining a steady data rate as the resulting signal is sent out
to a television monitor or other device. The rendering of complex edits, transitions, filters, composites,
and effects places enormous demands on the system. Although the video captured by your system is
compressed, it must be decompressed to be processed, and then, once rendered, it must be recompressed to be saved and stored.
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For example—just for standard NTSC, each frame of uncompressed video consists of 720x486 pixels
(NTSC). That’s 349,920 pixels per frame. There are 29.97 frames in every second of video, so that’s
approximately 10,500,000 pixels per second. Each pixel is made up of 3 bytes of color (RGB), meaning
that nearly 31,500,000 bytes—31.5 MB—of information need to be processed for every second of video
that’s altered in any way. Even for something as seemingly simple as adjusting brightness or contrast,
millions of calculations must be made to get the job done. The speed at which the task can be completed is dependent upon the power and speed of the processor. Moreover, your creative process, flowing
from task to task, can only proceed as rapidly as each operation is executed, so that it, too, is ultimately
dependent upon the processor.
When all is said and done, output is CPU-dependent, as well. If you’re planning to export your completed production in a compressed format, such as one of the MPEG variations or a Web-streaming
format, then the power of the CPU will determine the speed of the final file-creation process.
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C O N F I G U R I N G
Y O U R
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Even when the processing load is shared with or shunted to a video card (there’s more on video cards later in
this section), the performance of the CPU is still critical. In most cases, the video-editing software relies on
the CPU to handle functions like real-time previews and transcoding video for export. A number of computer manufacturers offer workstations specifically recommended for digital video editing. There are many
single and dual-processor computers that provide appropriate CPUs as well as other important features, such
as necessary I/O interfaces, that make them well-suited to video creation and other post-production tasks.
How much RAM do you need?
First, check the System Requirements for the software you’ll be using. However, because System Requirements are usually established using a clean computer, in the real-world you’re likely to want more than what
is recommended. While you may be able to struggle along with 256 MB of RAM, you’ll probably be much
happier with 512 MB. Most professionals opt for 2 GB of RAM. While some experts will tell you that, when
it comes to RAM, “bigger is better and biggest is best,” others say that above a certain amount, adding more
RAM is moot—a case of diminishing return on investment. But it’s always a good idea to hedge your bets—
Rule No. 1: Make sure you can add more RAM down the road.
How much speed do you need?
The data comprising each frame of video needs to be transferred to and from the processor at the video
frame rate—29.97 frames per second for NTSC—no matter how large the frames might be (that is, how
much data comprises them). For high definition (HD), you’re looking at 6 MB per frame, which translates to
a data transfer rate of 180 MB/second; for uncompressed standard video, approximately 1 MB per frame, or
almost 30 MB/second. The transfer rate for DV (standard video, compressed 5:1) is approximately 5-6 MB
per second. Real-time editing often means accessing two video streams, combining them—in a dissolve, for
example—and then merging the result into a single stream. This means that the required data rate has just
tripled! When you start thinking about compositing three or more streams of video and previewing or rendering the results in real time, the rate multiplies even more.
Video requires not only moving a great deal of data rapidly, it must also move at a steady, sustained pace.
If the transfer rate falls below what’s required, frames may be dropped, resulting in poor quality video.
Because systems with faster disks typically cost more, you’ll want a system with disks that are fast enough
to not drop frames, but not so fast that you’re paying a premium for speed you don’t need. If you are working with uncompressed video or HD, you should check the requirements for data transfer rate recommended
by the manufacturer of your video card.
A d o b e
D i g i t a l
V i d e o
How much storage do you need?
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There’s just no getting around the fact that digitized video is big. We’ve seen that uncompressed, a single
video frame is approximately 1 MB and, therefore, at the NTSC frame-rate of 29.97 fps, 1.5 GB is required
for just one minute of video. An hour-long program can consume 90 GB of storage, without even considering all the raw footage that went into it—often five times the amount of the actual production (450 GB);
for high-end productions, as much as 20-50 times (1,800-4,500 GB). And, with HD now a reality, a single
frame takes up to 6 MB; a minute of HDTV more than 10 GB; an hour requires 600 GB!
To figure the amount of storage you need for DV (compressed 5:1), you can calculate based on approximately 216 MB for each minute of stored video. Or, looking at it from the opposite direction, each gigabyte
of storage holds about 4 minutes, 45 seconds of video. For an hour of DV, you would need a 13 GB disk.
Let’s say that you’re an event videographer shooting standard DV and creating DVDs for your clients.
To figure out how much storage you would need to make a 2-hour DVD, here’s how you might do the math:
Start with what you need for your finished production—two hours of DV footage
26.0 GB
Add a conservative amount for unused footage—at least twice the finished amount
52.0 GB
Figure in some additional graphics—titles, for example—and audio tracks
2.0 GB
You’ll need space for the MPEG-2 files you export for your DVD
4.7 GB
Minimum storage space needed
84.7 GB
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STORAGE SUBSYSTEMS
Individual external hard disks, available in
the hundreds-of-dollars range, can now hold
up to nearly 200 GB of storage. Small and compact, usually quite portable, and often taking
advantage of convenient hot-swappable IEEE
1394 or USB interfaces, such drives make for
excellent—and affordable—“sneaker net”
solutions that can be physically picked up and
moved from one workstation to another.
A d o b e
D i g i t a l
V i d e o
RAID arrays are fast, fault-tolerant, and relatively expensive, typically costing from just
under a thousand to thousands of dollars.
A RAID is comprised of multiple hard disks
which (to the workstation operating system)
appear to behave as a single unit. RAID, which
stands for Redundant Array of Independent
Disks, is a technology that specifies at least
10 different ways to coordinate multiple disks,
each method optimized for different types of
storage requirements. Because all the disks in
a RAID can read and write simultaneously, a
RAID can access and deliver information faster
than a single hard drive. Most RAID configurations also store parity information to reconstruct lost data in the event of a crash. RAIDs
may be connected to workstations via IEEE
1394, SCSI, or fibre-channel interfaces.
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A Storage Area Network (SAN) may provide
terabytes of capacity, and is a commensurately
costly, centralized storage sub-network that
can be simultaneously accessed by multiple
users. A SAN may be JBOD (Just a Bunch of
Disks) or comprised of multiple RAIDs. Data
may be accessed in real time and at very high
speeds, most often via fibre-channel interfaces
or SCSI, although IEEE 1394-based SANs are
available. Anyone with authorization can access
any digitized content on the SAN, so the need
for multiple copies of large media files is
eliminated, thereby making this a very efficient
solution for larger production facilities and
workgroups. Depending on the software interface, the administration of a SAN may be done
remotely, offering incredible flexibility to
mobile workgroups among which workflow
must be reorganized on the fly. With the
ever-increasing demand for more digital
video content, SANs are becoming more
common, even in smaller production
environments.
C O N F I G U R I N G
Y O U R
S Y S T E M
It is unlikely that the amount of storage that comes as standard equipment with
your computer will be adequate for your video production needs. If you intend to
produce more than just very short video clips, you’ll want to consider a storage
subsystem. There are three general scales of subsystems, as outlined in the sidebar.
Companies that specialize in disk storage for video production applications often
rate their systems based on the amount of video they can store. When assessing such
systems, be sure to check if the ratings are based on uncompressed video or, if compressed, by how much. A storage system rated for 15 hours of DV video (compressed
5:1) would only hold 3 hours of uncompressed (1:1) video.
When calculating the amount of storage you’ll need, remember to account for more
than just what is needed for the finished program. And don’t neglect audio storage—
while it doesn’t consume nearly as much space as video, it should not be overlooked.
Do you need a video capture card?
With IEEE 1394 ports built into most computers these days, support for DV devices
built into your editing software, and analog-in with pass-through capability available
in camcorders, if you’re not going to be capturing much analog video, why do you
need a video capture card at all?
If you are a professional editor, you are probably going to need a video card to
capture analog footage. Make sure your capture card provides the capabilities you
need to work with your most important acquisition formats.
When it comes to video cards today, however, capture compatibility is just the tip of
the iceberg for professionals and hobbyists alike. There are several other reasons you
might want a video capture card:
• Some cards come with software tools that can be used to augment the capture
capabilities found in your editing software, cutting down capture time and saving wear and tear on camcorders and tapes.
• If your CPU is less than 3 GHz, you may not be able to take full advantage of
the real-time editing experience featured in Adobe Premiere Pro software, so a
real-time video card that provides the additional speed and power needed for
real-time rendering can increase your productivity.
• Some video card solutions offer enhancements to the capabilities of your
editing or effects software, such as 3D effects or real-time HD.
• Video cards can also boost productivity when it comes to delivering your
finished productions, speeding the transcoding process to a wide variety of
formats you need to export.
Six basic features define video capture cards:
1. Types of analog video input/output supported
2. Types of digital video input/output supported
3. Types of video compression supported
4. Types of special processing supported
5. Types of software included or supported
6. Types of audio supported
Your choice will depend on the type of video and how much video you will be
working with, as well as how time-critical your workflow needs to be. Other factors
may include cost and compatibility.
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T H E
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P R O C E S S
THE CREATIVE PROCESS
An overview of movie-making
Let’s assume you have a story to tell. It might be “Jonathan and Jennifer’s Wedding” or “The Hometown
Bank’s Loan Officer Training Guide” or “Emma’s Big Adventure: A Film About My Cat” or “How to
Assemble the Waldo Widget.” Whether you are making a very short video for the Web, an industrial or
training presentation, a television commercial, a feature film, or just doing a personal project, the process is virtually the same. This section describes the key steps.
As you can see from the following chart, sometimes stages will overlap. You’ll end up tailoring your
own process to fit the project, or to your own, individual working style. Depending upon your personal working preferences, you might want to shoot, create, or gather all your clips before you begin
the assembly process. Or, you might prefer to work back and forth on production and post-production
tasks (or, if you have a team, concurrently). With digital video, your movie making tasks can flow over
and around one another in an extremely fluid manner.
Preproduction
Production
Post-production
Plan the Project
•
•
•
•
•
•
•
•
•
Outline
Script
Storyboard
Budget/Finance
Cast
Costumes
Sets/Props
Locations
Logistics
Create/Gather
Raw Material
• Shoot video and
procure stock footage
• Create text and
graphics with
Adobe® Illustrator®
• Shoot/scan/prepare
stills with Adobe®
Photoshop®
• Create animations with
Adobe After Effects
• Record, sweeten,
mix, and edit highquality audio with
Adobe® Audition™
A d o b e
D i g i t a l
V i d e o
Preproduction
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Capture/Import
Assemble/Edit
Use Adobe Premiere
to:
• Use Adobe Premiere
to perform non-linear
editing (NLE) and to
author multimedia and
Web content
• Import DV
• Digitize analog video
and audio
• Import source material
in compatible Adobe
file formats and many
others
• Use Adobe Premiere
and/or Adobe Audition
to sweeten, mix, edit,
and synchronize audio
with video
Create/Composite
Use Adobe After Effects
to develop:
• Motion graphics
• Visual effects
• Sophisticated, multilayered compositions
Output, Author,
Distribute
• Use Adobe Premiere
to output an edit
decision list (EDL)
• Use Adobe Premiere
and/or Adobe After
Effects to output
your productions
for a variety of media
including: videotape,
film, CD, DVD, and
the Web
• Use Adobe® Encore™
DVD along with other
Adobe applications
to create menus for,
author, and produce
professional-quality
DVDs
Preproduction is the planning stage. Typically, it
includes steps to take before you begin production
Use royalty-free music
(shooting film or video). But this is a flexible
included with Adobe
process and the nonlinear editing methods made
Audition to create new
soundtracks
possible by the advent of digital video make it
even more so. When you begin your project, you
may have already shot some or all of the video
you’ll need. You may be re-purposing content that includes existing video, still photography, charts,
graphs, illustrations, or animations. Or you may be starting with a blank slate. The preproduction
phase should include all the steps you need to take to be sure that you are prepared to move from
concept to completion.
• Outline: No matter how simple (and this is, of course, a relative term!) you intend your project to
be, begin with an outline. An outline helps you plan. It can be shared with coworkers or clients to
make sure everyone is “watching the same TV show” in terms of their expectations. Your outline
will help you identify what materials you need to create, assemble, or acquire to get your process
underway. You can also use your outline to plan the budget for your project.
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• Script: An outline may be enough for you to work from, or you may want a more formal script
that includes dialogue, narration, notes about the locations or settings, the action, the lighting,
the camera angles and movements, the edits, as well as the visual and sound effects.
• Storyboards: You may also choose to do storyboards—sketches of key moments in the action—
like a comic strip—labeled with notes about the action, sound, camera angles or motion, and so
forth. Sometimes storyboards are even translated into motion to create animatics, using a tool
like Adobe Premiere Pro or After Effects. This is called previsualization, and may be used to help
work out notions for a sequence, share an idea with coworkers, or sell a concept to a client.
• Budgeting: Whether you are doing a personal or a professional project, it is definitely a good
idea to add a budget to your outline as early as possible. For professionals, you’ll need a budget
to secure financing. Your budget should include wages for yourself, your coworkers, actors, and
other talent (for example: effects specialists, graphic designers, musicians, narrator, animal trainers), as well as costs for location fees, costumes, props, equipment rentals, catering—and anything else you can think of, such as videotape or DV cassettes, lunch, and miscellaneous expenses.
• Casting, Locations, Props, Costumes, Equipment Rentals, Catering, and so forth: Every project
is different. Plan adequately for yours. Do sweat the details! Here’s a very brief list of tips to get
you started thinking about some of those details:
• Take the time to test your cast to make sure they work well together. For example, a conversation between a very tall and a very short person might not work well on camera.
• If you are shooting real people be sure to give them guidance about what to wear. For example:
white shirts generally don’t photograph well, as they may glare under artificial light; stripes
and small patterns might be problematic. Real people should be reminded to pay special attention to grooming (hair and makeup) if they are going to be in your video, or you might want
to have professional help on hand.
• If necessary, get permission to use locations.
• Be sure your costumes, sets, and props will be ready when you need to shoot.
• Make sure you have all the rental equipment you need, that it all functions, and that you know
how to use it—before you head out for a location.
Production
A d o b e
D i g i t a l
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“Quiet on the set! Action! Roll ‘em!” Capturing live or animated action and sound on film, videotape,
or DV—shooting or creating raw footage—is called production. During production, your concerns
will include: lighting, “blocking” (where and how your actors or subjects move), and shooting (how the
camera moves and from what angles your scenes are viewed). There are many good learning references
available regarding production—books, Web sites, classes, and more.
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Postproduction
What comes out of production is a collection of clips—different scenes shot in different places at
different times. To actually develop and deliver your story, you need to edit and assemble your clips
and, perhaps, add visual effects, graphics, titles, and a soundtrack. This part of the process is called
postproduction. This is where Adobe enters the picture, with four of the industry’s leading software
applications specifically designed for post-production:
• Adobe Premiere Pro—real-time editing for professional video production
• Adobe After Effects—the essential tool for motion graphics and visual effects
• Adobe Audition™—the essential tool for professional digital audio
• Adobe Encore™ DVD—creative authoring for professional DVD production
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T H E
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P R O C E S S
Adobe delivers the leading edge software you need to produce professional quality
results for film, video, DVD, and the Web. This comprehensive video production
toolset is well integrated, streamlining your workflow to give you more time to be
creative and to maximize your productivity. Adobe products have a familiar interface that will get you up to speed quickly, while letting you customize them to
meet your particular workflow needs.
Adobe makes it easy for you to acquire all the software you need, with an affordable collection developed specifically for videographers. Comprised of Adobe
Premiere Pro, Adobe After Effects, Adobe Audition, and Adobe Encore DVD, the
Adobe Digital Video Collection is a powerful and complete set of professional
tools that deliver unparalleled integration and precise control for creating movies
and motion graphics from digital video.
Adobe is also well-known for two powerful software applications that have set the standard for graphic
arts professionals worldwide and are enormously useful for creating and enhancing elements during the
post-production process—Adobe Photoshop® and Adobe Illustrator®. Plus, if you plan to incorporate
your video productions into Web sites, Adobe can provide the software you need for a comprehensive,
tightly-integrated solution—choose Adobe GoLive® for developing and managing your Web sites.
A d o b e
D i g i t a l
V i d e o
In the next sections, you’ll find lots of useful information about post-production techniques.
We have used our own products to illustrate these techniques because Adobe software products
adhere to (and, in many cases, have established) industry standards for digital video post-production.
So, whatever software you choose, the material presented in this Primer will help you learn about
what's involved in the post-production process.
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A C Q U I R I N G
S O U R C E
M A T E R I A L
ACQUIRING SOURCE MATERIAL
You’ve configured your system. You’ve shot or gathered some video. And you are eager to begin postproduction. But first you need to gather all of your raw material together on your computer.
“Be prepared” should be your motto. You simply never know what file formats you’ll need to handle,
nor what the media requirements will be for different projects. That’s why Adobe Premiere Pro imports
and exports all of the leading video and audio formats natively and why it supports virtually any codec
that the Windows XP operating system supports.
Adobe Premiere Pro offers the most flexible support, enabling you to import and work with all these
leading formats:
• Video files in MPEG-1, MPEG-2, DV, AVI, Windows Media 9 Series, QuickTime, and Open DML
• Audio files in WAV, MP3, and AIFF, as well as audio-only AVI and QuickTime
• Still-image and sequence files in AI, AI sequence, PSD, PSD sequence, JPEG, TGA, TGA sequence,
TIFF, TIFF sequence, PCX, BMP, and BMP sequence
Capturing analog video
Despite a world gone digital, it’s not unlikely that you’ll still need to capture analog footage. So it’s best to
choose format-agnostic software (like Adobe Premiere Pro), engineered to handle the capture of the wide
variety of video formats you’ll need to accommodate (for example: composite, component, S-video, SDI,
HD). You can digitize analog video directly into Adobe Premiere Pro using digitizing hardware to connect
an analog video player or camera to your computer. Video-digitizing hardware is built into some personal
computers, but usually must be added to a system by installing a compatible hardware capture card.
Alternatively, if you have a digital camcorder that has analog-in with pass-through capability, you can route
analog video through your digital camcorder (where it will be digitized) and into your computer. If you will
be adding analog video to a DV project, you can avoid compatibility problems by digitizing the analog video
as if it were DV.
For a list of Adobe-certified third-party capture cards, visit: www.adobe.com/products/premiere/6cards.html
DV without delay
A d o b e
D i g i t a l
V i d e o
If you shot DV, or if your raw material is on DV tape, with Adobe Premiere Pro, capturing your clips can be
as easy as “plug and play.” Built-in support for the IEEE 1394 interface allows frame-accurate control for all
types of DV devices. You can efficiently review footage, set in and out points, and use EDLs to perform automated batch captures, without ever leaving your NLE application. Adobe Premiere Pro lets you customize a
wide range of settings to streamline and optimize your workflow.
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• Device control customization: Just specify the DV device (deck or camcorder) manufacturer and
model and Adobe Premiere Pro optimizes its built-in device control for maximum reliability and efficiency, making the video capture process more precise. Scene detection controls let you automatically
detect scenes and divide raw DV footage into separate scene-based clips that are faster and easier to
work with. You can also scan tapes to create low-resolution, scene-based clips for offline editing, then
batch-capture full-resolution versions of the clips you need after assembling your rough cut. By default,
Adobe Premiere Pro uses the new Adobe DV Codec to capture DV clips in their native YUV color space
and preserve their color quality.
To find out if your hardware is compatible with the built-in DV support in Adobe Premiere Pro, use the DV device
compatibility database at www.adobe.com/products/premiere/dvhdwrdb.html
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A C Q U I R I N G
S O U R C E
M A T E R I A L
• DV presets: Adobe Premiere Pro stores groups of project settings in files called presets, which
include settings for compressor, frame size, pixel aspect ratio, frame rate, depth, audio, and field
order. When you start a project, you’ll be prompted to select a preset, or select individual settings
to customize your own.
The Adobe Premiere Pro Capture window lets you specify a target bin in the Project window, then capture clips
directly to the bin. Also keep an eye on available hard-disk space, deck activities, and other data during capture.
Tabs
Status area
Preview panel
Metadata, for example:
source tape name, clip
name, description,
and so forth.
Device controls
Color without compromise
Adobe Premiere Pro provides native support for YUV color, enabling you to preserve the native color space
of the original video material. This support ensures higher color quality in your final video productions
because the source footage no longer passes through a lossy conversion to RGB color. It also improves overall performance because the application isn’t performing processor-intensive color conversions. With native
YUV processing, you get better results faster!
A d o b e
D i g i t a l
V i d e o
Batch capture
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If you have the proper setup for device control and have a videotape recorded with timecode, you can
set up Adobe Premiere Pro for automatic, unattended capture of multiple clips from the same tape. This
is called batch capture. You can batch capture clips from analog or DV camcorders or decks. First you log,
or create a list of, the segments you want to capture, using the Batch Capture window. The list (called a
batch list or timecode log) can be created either by logging clips visually, using device control, or by typing
In and Out points manually. When the batch list is ready, you just click one button to capture all the clips
in the list. Batch capturing is very useful in a professional production environment, and can be especially
helpful when you need to return to a previously produced project that you need to recreate from the
original tape sources.
Importing still images
The ability to import still images—photographs and illustrations—is also an important feature to look for.
You may want to import photographs to create movie montages or acquire illustrations to incorporate in
animations. Tight integration with industry-standard image-editing software like Adobe Photoshop and
leading vector-drawing software like Adobe Illustrator facilitates this type of work.
Importing computer graphics
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SOME CAPTURE TIPS
• Use a separate hard disk for capturing video—
the fastest hard disk you’ve got. You can use
Adobe Premiere Scratch Disks preferences to
select the disk to which you want to record.
Faster rotational speeds allow for faster sustained
throughput without dropping frames. While
7200-rpm IEEE 1394 drives will eventually get the
job done, 10,000 or 15,000 rpm Ultra 320 (U320)
SCSI hard drives are probably a better choice for
professional production environments. For maximum performance, U320 controllers also provide
enough bandwidth to support multiple drives
configured for RAID.
• Defragment the capture disk just prior to capture,
so free space is available in large contiguous
blocks. A fragmented hard disk can reduce
capture frame rate.
A d o b e
D i g i t a l
V i d e o
• Place as few other demands on the system as
possible, to gain the undivided attention of the
CPU. If other programs are running (for example:
virtual memory, network connections, unnecessary drivers or extensions), they may interrupt
capture with calls for processing time. To lighten
the processing load, keep open only essential windows and palettes. In Adobe Premiere, you can
toggle the TAB key to close all open palettes or
make them reappear.
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• Capture audio at the highest quality settings your
computer can handle, even if those settings are
higher than those you’ll specify for final export or
playback. This provides headroom, that is, extra
data, which will help preserve quality if you adjust
audio gain (volume) or apply audio effects such
as equalization or dynamic range compression/
expansion. Standard practice is to make sure the
gain level is correct when you capture because, if
the gain in an audio clip was set too low when it
was digitized, increasing the gain may emphasize
noise or introduce distortion.
A C Q U I R I N G
S O U R C E
M A T E R I A L
If your source material includes digital animations or computer graphics, previously digitized clips, or digital sound, you can import or export many different
types of video, audio, and image formats. Support for input and output formats
in Adobe Digital Video software is extensive. If support for the format you want
is not built into Adobe Premiere Pro or After Effects, chances are a third party
plug-in will provide it.
Find a list of plug-ins for Adobe Premiere Pro at www.adobe.com/products/plugins/
premiere/main.html, and a list of plug-ins for Adobe After Effects at www.adobe.com/
products/plugins/aftereffects/main.html
Capturing audio
Be sure your software provides support for all the significant audio formats.
You should be able to import separate digital audio clips from tracks in video
files or from audio files stored on a hard disk or other digital media such as a
CD or DAT tape.
Adobe Premiere Pro and Adobe Audition both provide excellent support for
capturing audio. For example, both applications can import and export the
highest-quality 24-bit, 96 KHz audio files, and support any ASIO-compliant
audio card or device.
In Adobe Audition, you’ll find support for 20 different input audio file formats,
as well as support for recording from all the standard input devices and cards
you would expect. Device Properties and Device Order dialog boxes give you all
the controls you need to work with your favorite input and output audio hardware. Record up to 32 different sources at once, and specify different output
devices for different tracks or buses in your session. And Adobe Audition makes
CD ripping (that is, extracting audio from a CD) as easy as working from any
other source audio file.
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NONLINEAR EDITING
Yes, it’s finally time to put it all together. And post-production has never been easier. Nonlinear editing
(NLE) makes editing and assembling your production as easy and as flexible as word processing. Once
your raw materials are in your computer, you can edit, alter, adjust, and reconfigure them—over and
over again—with a few mouse clicks. In this section, we’ll introduce you to some of the basic concepts
involved in nonlinear editing, as well as giving you an overview of Adobe Premiere Pro, the real-time
editing solution for professional video production.
Getting to know NLE tools
By getting to know the Adobe Premiere Pro interface, you’ll learn about many of the tools and methods
that are familiar to seasoned professionals who may have learned their craft working on costly high-end
systems. Yet Adobe Premiere Pro software is also easy for beginning video enthusiasts to learn and use.
Because of its flexibility and many customization options, Adobe Premiere Pro is a good choice for
beginners and experts alike.
Three named windows form the main work area in Adobe Premiere Pro:
• the Project window, where assets are managed
• the Monitor window, where video being edited is viewed
• the Timeline, where video clips are arranged over time.
The main work area in Adobe Premiere Pro
Monitor window
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Project
window
Timeline
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ONLINE AND OFFLINE EDITING
Online Editing: Online editing is the practice of
doing all editing (including the rough cut) on the
clips that will be used to produce the final cut.
Online editing used to be done on only on highend workstations that could meet the quality and
data-processing requirements of broadcast video.
Editors who could not afford an online system
had to rent time at a production facility. As personal computers and affordable workstations
have become more powerful, online editing has
become practical for a wider range of highquality productions.
For online editing using analog source material,
you capture clips once at the highest level of quality your computer and peripherals can handle.
With standard DV source material, all editing is
typically done online because DV compression
makes standard DV manageable.
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Adobe Premiere Pro also provides specialized windows for tasks such as
capturing video, creating titles, applying and controlling effects, and mixing
audio. Additionally, a variety of feature-rich, pop-up palettes for handling
transitions, effects, and other functions are visible when needed but can be
hidden to conserve screen real estate.
The configuration of windows and palettes in Adobe Premiere Pro is completely
customizable, so you can optimize your workspace to suit your needs or your
own style of working. You can create and save named window layouts as workspaces available to any project. Additionally, when you exit Adobe Premiere Pro,
the position of windows and palettes are saved with the project.
Staying organized
A short production may include only a few clips; longer productions may
require hundreds or even thousands of assets. With the current propensity for
repurposing, it has become more important than ever for videographers to keep
assets well organized. Make sure your software includes a good asset management system that lets you preview clips, identify clips visually with the still
frames (aka poster frames) you select, annotate clips with essential information,
and easily access detailed information about all your video and audio assets.
The Adobe Premiere Pro Project window displaying Preview and Bin areas
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Offline Editing: In offline editing, you edit a
rough cut of your video using low-quality clips,
and then produce the final cut using high-quality
clips. Offline editing was originally developed to
save money by preparing rough cuts on less
expensive systems. Although offline editing can
be as simple as writing down time points for clips
while watching them on a VCR, it is increasingly
done using personal computers and capable software such as Adobe Premiere Pro.
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If you are working with analog source material,
offline editing techniques can be useful even if
your computer can edit at the quality of your final
cut. By batch-capturing video using low-quality
settings, you can edit faster, using smaller files. In
most cases, you need only enough quality to identify the correct beginning and ending frames for
each clip. When you’re ready to create the final cut,
you can redigitize the video at the final-quality settings. This is another example of where the logging
and batch capture techniques in Adobe Premiere
Pro can be useful.
Professional editors looking for a powerful, affordable offline editor will appreciate the way Adobe
Premiere Pro software facilitates quickly building an offline edit and exporting an advanced
authoring format (AAF) file. AAF files can be
exported from Adobe Premiere Pro for use with
other editing systems. (See the sidebar on page
28 to learn more about AAF files.)
In Adobe Premiere Pro, the Project window manages all the assets in your
video project including video, audio, stills, and titles. You organize your assets
into folders called bins, which can be given custom names (such as Scene 12,
Voiceovers, Chase Scene). The Project window provides database functionality,
so you can use metadata to sort or search your media assets, as well as add
custom fields of information. The Project window can be displayed in a variety
of different ways, depending on the task at hand:
• As shown above, the Project window can display Preview and Bin areas,
providing a convenient overview of the files associated with a project.
• Preview Area: Click the Play button under a thumbnail-sized poster
frame to preview a video clip within the Project window. The Preview area
includes basic information about the clip, such as frames per second and
average data rate. The poster frame used to represent a clip can be changed
from the default (first frame) to any frame you select.
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THANK YOU MAM!
As the world’s gone digital, the facts, photos, and footage
we used to archive and catalog in file cabinets and on library
shelves has found its way into our computers. What an incredible opportunity! Digital media assets can and should be
searchable, accessible, and (via intranets or the Internet) easily exchangeable across workgroups and even around the
world. A whole industry has emerged, focused on Media
Asset Managment (MAM), also known as Digital Asset
Managment (DAM).
One of the major challenges in the development of media asset
management solutions was how to make the essence (that is,
the actual images, animations, video, and audio clips that have
been created and stored in a host of different formats) and its
associated metadata (ancillary data that describes and specifies essence, such as: source location, timecode, transitions,
descriptive key words, and so forth) exchangeable across
different computing platforms and between various multimedia and post-production applications. An open standard
was needed—one that would be amenable to the many
industries interrelated around video.
The answer began to emerge with OMF (aka OMFI), the Open
Media Framework Interchange format, a media and metadata
exchange solution introduced by Avid. Initially, OMF was not
broadly adopted but, as the industry transitions to the more
widely accepted AAF standard, more applications and utilities
are facilitiating support for the OMF interchange, as well.
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AAF, the Advanced Authoring Format, has emerged as the open
standard-of-choice. Sometimes described as a “super EDL” solution, AAF is, essentially, a wrapper technology that can carry
either the essence itself or merely links (pointers) to it, along
with relevant metadata. Although AAF files may contain the
actual essence, the emphasis of this format is the exchange of
composition metadata—that is, the information that describes
how essence is handled in a composition, rather than on the
exchange of the essence itself.
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In addition to AAF, a related standard is now also coming into
broader use—MXF, the Material eXchange Format. Like AAF
(of which it can be an object subset), MXF is an open standard
for the exchange of essence (actual images, video and audio
clips, and so forth) and its associated metadata—across platforms and between applications. MXF was designed for less
complex metadata applications than AAF—while AAF may
carry the actual essence or only a link to it, MXF always carries
the essence along with the metadata—the primary objective
of MXF being the streamlined exchange of the essence itself
with its associated metadata. MXF files may be used as a source
for AAF. With its greater emphasis on actual essence exchange,
MXF is better optimized than AAF for real-time streaming of
video and audio assets, making it an excellent solution for
such applications as broadcast news editing.
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• Bin Area: The Bin area provides a hierarchical representation of the files in your project. Use the Search button to find
what you need, fast. Command buttons let you quickly delete
selected clips and bins and add new items. The “Export Bin
From Project” feature lets you share bins among projects.
• The List and Thumbnail views can be combined, so you can
choose to display a Thumbnail together with detailed file
information. The fields available in List view include columns
for media start/end, video and audio in and out points, offline
properties, scene, shot/take, client, compressor, and more.
You can rearrange, add, remove, rename, hide, and show any
column. In addition, you can create any number of userdefined columns that offer text entry fields or checkboxes.
For example, you could create a Legal Signoff column and
check off each clip as usage approvals come in for a video
shot or piece of audio.
• The Storyboard view presents media in an orderly grid. You
can select and rearrange icons anywhere in the grid, even in
noncontiguous arrangements.
Looking for approval?
With Adobe Premiere Pro, you can assemble a storyboard or
rough cut in minutes. Using the Storyboard view in the Project
window, you can quickly assemble stills, such as photos or concept sketches, into a storyboard-style slide show or, if you have
clips, into a rough cut. Just drag and drop poster-frame icons,
arranging and rearranging them until you, your colleagues, and
your clients are completely satisfied. Then use the Automate To
Sequence command to instantly send your sequenced material to
the Timeline, where it will be automatically assembled using a
default transition you specify. Add music and voiceover for a
smooth presentation you can use to share your concepts.
Adobe After Effects is also a wonderful visualization tool that can be
used to help you share and sell your concepts—read more about
After Effects in the next section of this Primer.
Preparing your assets
Assets aren’t always perfect. Before you begin to assemble your
production, you’ll probably want to clean up imperfections and
inconsistencies, especially when it comes to color.
Color can have a dramatic impact on a movie. Emotional overtones change when the colors on-screen look lush and vibrant, or
when they look more muted. It’s critical to ensure that colors look
consistent from cut to cut because jumps in color create a jittery
effect that’s highly noticeable to audiences. Editors commonly
perform color correction to make sure that all of the shots in a
scene match, to adjust key elements to look a certain way, and to
correct exposure, color-balance, and other jarring errors caused
by lighting, cameras, and environment.
If your production is destined for broadcast, the color must meet
legal broadcast standards. When videos exceed these limits, colors
tend to bleed into one another, blacks and whites look washed
out, and the picture signal can even get distorted.
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The color correction controls in Adobe Premiere Pro give you precise control.
Use built-in color monitors to see if clips meet legal color broadcast standards.
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Adobe Premiere Pro provides built-in vectorscope,
waveform, YCbCr Parade, and RGB Parade monitors
to offer highly accurate readouts of chrominance
(hue and saturation) and luminance (image intensity
from absolute black to bright white). With these tools,
you can see whether clips share a common color
spectrum and make sure that your color adjustments
fall within legal broadcast limits. The three-point
color correction tools in Adobe Premiere Pro give you
precise control over the look of every clip in your
project. With the Color Corrector effect, you can
apply three-point adjustments to the hue, saturation,
and lightness for highlights, midtones, and shadows.
The Color Match effect lets you replace a color
throughout a clip with a single selection.
Putting the pieces together
Enough of your assets have been captured, coordinated, corrected, and created for you to begin putting
your production together. With capable and costeffective NLE software like Adobe Premiere Pro, you
can work just as you would on any high-end proprietary system, with precise trimming tools and support
for three-, four-, five-, six-, and seven-point edits.
Adobe Premiere Pro also facilitates the slip and slide,
ripple and roll edits described in this section, and lets
you work with industry-standard keyboard shortcuts.
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For piecing together your production, you’ll work back and forth between the three named windows in
the main work area: the Project window (which you’ve already learned something about), the Timeline
window, and the Monitor window.
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The Timeline graphically shows the placement of each clip in time, its duration, and its relationship to
the other clips in the program. Once you’ve captured or imported clips into your project, you can use
the Timeline window to organize your clips sequentially; make changes to a clip’s duration, speed, and
location; add transitions; superimpose clips; and apply effects, opacity, and motion. The Adobe Premiere
Pro Timeline is easy to use, understand, and manage—clips of audio, video, and graphics can be moved,
trimmed and adjusted with simple mouse clicks or with keyboard commands. Up to 99 video and 99
audio tracks can be created for your program, and each track can be given a descriptive ID. Tracks can
be hidden to reduce screen clutter or locked to avoid accidental changes. Each track in Adobe Premiere
Pro is collapsible, which means that there is more information available by clicking and “twirling down”
a track. This saves screen space but keeps critical controls handy. You can uncollapse tracks to make
precise adjustments to transitions between specific video clips. The preview indicator area (directly
under the yellow work area bar) is color-enhanced: green means that a preview exists on disk for the
segment; red indicates that you need to build a review file for the segment; and no color shows a
cuts-only segment that can play in real time.
In Adobe Premiere Pro, you can set up a virtually unlimited number of timelines and nest any number
of timelines inside others with complete flexibility. The ability to create and nest multiple timelines
streamlines a range of editing tasks. You could, for example, divide a complicated video project into
parts with each part assembled on a separate timeline, and then combine those parts together by nesting
the timelines into one main timeline. You could also set up one timeline and then duplicate it several
times to try out different cuts or visual effects for a client or director without affecting the original
version. Quickly comparing the original against several variations can speed up editing decisions and
client approval significantly. In addition, you could use separate timelines to manage how effects are
applied—you could, for instance, apply different effects to several timelines, and then nest those timelines together to apply an effect, such as a color correction, to all of them.
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The Timeline window in Adobe Premiere Pro
Multiple timelines
Nested timelines
on video track 1
A tab for each timeline
appears in the Program
view area of the Monitor
window. Clicking a tab
here brings the related
tab forward in the
Timeline window,
and vice-versa.
The floating tool palette is accessible from any timeline.
You can use the Monitor window to view a wide range of media including individual clips, still images, audio, color mattes, and titles. Resizing the monitor
window dynamically resizes the video image displayed in each view. To help you
position elements on-screen, you can switch on safe zone guides. A magnification
setting lets you examine the image in detail or zoom out when you need to see
the off-screen pasteboard area. In addition, you can manually reset display
quality, which can reduce rendering times.
The Monitor window in Program view
Use controls in the Monitor window to play, pause, and scrub a clip. Use tools
for setting video, audio, and program In and Out points. Set and move among
clip and sequence markers, perform insert and overlay edits, move forward and
backward frame-to-frame, or edit-point to edit-point, and much more. Editing
clips in the Monitor window dynamically updates the targeted timeline.
The Monitor window can be displayed in either of two basic formats:
• Dual view: As shown on page 26, in the default Dual view, the Source view displays the most recently
activated clip in a tab named for that clip The tab also includes a drop-down list of clips previously
activated in a session, so you can quickly switch from clip to clip. The Program view, which lets
you view the program you are constructing, displays a separate tab for every timeline.
• Program view: As seen on this page, just the program under construction is displayed.
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In addition to the three primary windows in Adobe Premiere Pro, there are numerous other windows
and palettes that provide information and functionality. For example:
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• The Trim window provides even more precise control than the Monitor window over ripple, rolling, slip, and slide edits. You can view live updates in the Trim window, which shows an edit in
progress as you’re adjusting the clip.
• You’ll use the bins in the Effects window to keep your video and audio effects and transitions
organized; use the Effect Controls window to apply effects and transitions to your clips.
• In the Audio Mixer, you can adjust settings while listening to audio and viewing video tracks.
• The Adobe Title Designer gives you the ability to design sophisticated titles for use in your
productions, using templates provided or working from scratch.
• The Info and History palettes will be familiar, if you’ve worked in other Adobe applications. The
Info palette displays vital information about the selected item; the History palette lets you navigate
among the available levels of Undo.
Most windows and palettes include menus that appear by clicking a button. All windows have context
menus, the content of which depends on the current task or mode. Some windows contain tabs that
you can click to view. Tabs can be dragged away, forming separate windows that can be recombined, so
you can customize your workspace to suit your own working style.
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• Changing clip speed: Clip speed is the playback rate of
action or audio compared to the rate at which it was recorded.
When the speed is accelerated, everything appears to move
faster; when the speed is reduced, the action or audio plays
back in slow motion. Changing a clip’s speed alters its source
frame rate. Some frames may be omitted when the speed
is increased; when the speed is decreased, frames may be
repeated. Changing the speed to a negative value, (such
as -100) causes the clip to play in reverse. You can change
a clip’s speed numerically in the Adobe Premiere Pro Project
window, or in the Timeline window by choosing Clip > Speed
from the title bar. You can change speed visually in the
Timeline window by using the rate stretch tool to drag
either end of the clip. A three-point edit can also change
the speed of a clip.
• Altering clip duration: The duration of a clip is the length
of time it plays—from its In point to its Out point. The initial
duration of a clip is the same as it was when the clip was
captured or imported; if you alter the source In and Out points,
the duration of the clip changes. In Adobe Premiere Pro, you
can edit In and Out points in the Project window, the Monitor
window, or directly in the Timeline. You can change duration
numerically in the Project window or in the Timeline window
by choosing Clip > Duration from the title bar. You can change
duration visually in the Timeline by dragging either end of
the clip with the selection tool.
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It’s important to note that when you perform any action
that extends the duration of a clip (which may include
ripple or rolling edits) additional frames must be available
in the source clip (the clip you originally captured or imported) before the current In point or after the current Out point.
This is why it’s a good practice, whenever possible, to capture
extra material.
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• Ripple edit: A ripple edit changes the duration of a clip,
correspondingly changing the duration of the entire program.
When you use the ripple edit tool to shorten or lengthen a
clip by dragging its beginning or ending in the Timeline, the
adjacent clip is not affected and, consequently, the duration
of the program is shortened or lengthened.
• Rolling edit: A rolling edit changes the duration of the
selected clip and of an adjacent clip, maintaining the overall
duration of the program. When you use the rolling edit tool
to shorten or lengthen a clip by dragging its beginning or
ending in the Timeline, the adjacent clip will be correspondingly lengthened or shortened, maintaining the overall
program duration.
Find “More Useful Editing Techniques” on page 32.
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Ripple edits
In this example of a ripple edit,
the Out point of a clip is moved
2 frames to the right in the Timeline, resulting in the duration of
the clip being lengthened by 2
frames. The adjacent clip is not
altered by a ripple edit; therefore,
the overall program duration is
lengthened from 8 frames to 10.
In this ripple edit, the Out point
of a clip is moved 2 frames to
the left in the Timeline, resulting
in the duration of the clip being
shortened by 2 frames. Because
the adjacent clip is not altered by
a ripple edit, the overall program
duration is shortened from 10
frames to 8.
Rolling edits
In this example of a rolling edit,
the Out point of a clip is moved
2 frames to the right in the Timeline, resulting in the duration of
the clip being lengthened by 2
frames. The rolling edit shortens
the beginning of the adjacent clip
by 2 frames, thereby preserving the
duration of the overall program.
In this rolling edit, the Out point
of a clip is moved 2 frames to
the left in the Timeline, resulting
in the duration of the clip being
shortened by 2 frames. The rolling
edit correspondingly lengthens the
beginning of the following clip by
2 frames, thereby preserving the
duration of the overall program.
Slip edits
The slip edit moves the In and
Out points of a clip, but does not
change the duration of the clip,
does not affect the adjacent clips,
and does not alter the duration
of the overall program.
You can slip the In and Out points
of the clip to the right or to the
left on the Timeline; neither the
adjacent clips nor the overall
program length are affected.
Slide edits
The slide edit moves the In and
Out points of a clip without
changing its duration, while the
Out and In points of the adjacent
clips are moved, so the overall
program duration is preserved.
You can slide the In and Out
points of the clip to the right or to
the left on the Timeline; the overall
program length is maintained
because the Out and In points of
the adjacent clips slide accordingly.
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• Slip edit: A slip edit shifts the In and Out points of a clip
without changing the clip’s duration, without affecting adjacent clips, and without altering the overall program duration.
You can use the slip edit tool in the Timeline to drag a clip left
or right, and its In and Out points will shift accordingly. In
other words, a slip edit alters which specific portion of the
source clip is included, but does not alter the duration of the
selection. The slip edit is extremely useful for when you slap a
bunch of clips down quickly, then plan to go back and fine
tune later, but do not want to mess up the pacing and edit
points downstream.
• Slide edit: A slide edit preserves the duration of a clip and
of the overall program by changing the Out point of the
preceding clip and the In point of the following clip. When
you use the slide edit tool, sliding an entire clip forward or
backward in the Timeline, the adjacent clips are correspondingly lengthened or shortened by the same number of
frames; therefore, the duration of the program stays the same.
A slide edit affects three clips: the clip being slid (the duration
of which stays the same), as well as the two clips before and
after the slid clip (the durations of which are both altered).
The overall program duration is maintained.
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• Three-point edits: When you are lifting and replacing
footage in a video program, four points must be specified.
Those four are the In and Out points of the source clip (what
segment you are taking) and the In and Out points for the
program (where you are putting it). With three-point editing
in Adobe Premiere Pro, you need only specify any three of
these four In and Out points. The software then automatically
calculates the fourth point to ensure a proper edit, and even
will adjust the speed of the clip to fill a gap if you like. Monitor
window controls and keyboard short-cuts make three-point
editing quick and easy in Adobe Premiere Pro.
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• Four-point edits: A four-point edit is useful when the
starting and ending frames in both the source and program
are critical. In a four-point edit, you mark all four points.
If the durations are different for the marked clips, Adobe
Premiere Pro alerts you to the discrepancy and provides
alternatives to resolve it.
• Six-point edits: More commonly called a split edit, in a
six-point edit, a clip’s video and audio start or end at different
times. In one version of a split edit, called an L-cut, the audio
Out point is later than the video Out point, so the audio continues to play after the beginning of the next clip appears.
The audio from a concert, for example, could extend into the
next shot of a nature scene. Another kind of split edit is the
J-cut, also known as an audio lead, which you use when you
want a clip’s audio to begin playing before the corresponding
video appears. For example, you may want to begin hearing a
speaker’s voice while showing a relevant scene, then transition
to the shot of the person speaking.
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Making transitions
Transitions can be useful in setting a mood or adding a creative
element to your project. Examples of transitions include dissolves,
wipes, zooms, page peels, and many others. Adobe Premiere Pro
includes a whole library of transitions, and you can add others,
such as QuickTime transitions. You’ll find transitions in the Video
Transitions Bin in the Effects window. Within this bin, transitions are
organized into nested bins by type. You can customize these groupings,
putting the transitions you prefer into bins you name, or by hiding
transitions that you don’t often use.
To add a transition, simply drag the icon from the Transition palette to
a point in the Timeline where two clips meet. Or, a default transition
can be specified, and the process of adding transitions can be automated. You can use the Effect Contols window to apply, remove, or adjust
the settings of a transition at any time.
All transitions have duration, alignment, and direction parameters.
Duration refers to the number of frames affected by the transition.
Transitions use frames from the end of the first clip—called “tail
material”—and frames from the beginning of the second clip—called
“head material.” Alignment refers to the position of the transition in
relation to the cut between the two clips. The options are Center at
Cut, Start at Cut, and End at Cut. Direction indicates how the transition operates on the two clips. Normally, the direction will be from
the first clip to the second—from left to right on the Timeline—but
for some types of transitions, you may want to change the direction.
Adding effects
Video and audio effects (sometimes known as filters) serve many useful purposes. You can use them to fix defects in video or audio, such as
correcting the color balance of a video clip or removing background
noise from dialogue. Effects are also used to create qualities not present in the raw video or audio, such as softening focus or giving a sunset tint, or adding reverb or echo to a sound track. Multiple effects
may be applied to a clip, but note that the result may vary depending
on the order in which effects are rendered.
Adobe Premiere Pro includes dozens of effects, including many shared
with Adobe After Effects. Additional effects are available as plug-ins.
Adobe Premiere Pro comes with several Adobe After Effects plug-ins
that can be used in your video work, and many other plug-ins are
available from third-party vendors or can be acquired from other
compatible applications. Video effects are found in the Video Effects
bin in the Effects window; audio effects in the Audio Effects bin. As
with transitions, effects are grouped by type in nested bins. You can
reorganize effects and customize bins as you prefer and hide effects
or bins that you rarely use.
To apply an effect, just drag it to a clip in the Timeline window or,
if the clip is selected in the Timeline, the effect can be dragged to the
Effect Controls palette, where attributes can be modified and, if multiple effects have been applied, the order in which they are rendered can
be adjusted. You can apply, disable, or remove an effect at any time.
By default, when an effect is added, keyframes are set at the beginning
and end of the clip, resulting in the effect being applied to the entire
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WHAT’S THE DIFFERENCE
BETWEEN EDITING IN AND
OUT POINTS AND TRIMMING?
Editing a video program means using only the best
segments of the material you have shot or gathered.
In the first stage of the process—capturing—you
select those portions of material that you think you
might want to use and save them on your hard drive.
You will probably capture more clips than you will
actually use, and it’s likely that you won't use your
captured clips in their entirety.
When you insert clips into your video program, the
clips do not become part of the program file; rather,
the program references the source clips stored on your
hard drive. Clips become part of the finished program
only when you export your project to a delivery medium, such as videotape or to a file to be posted on the
Web. Unless you are absolutely sure you will not be
using some of the source clips you captured, it’s best
not to delete any of them from your hard drive until
your project is completed.
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clip. If an effect has adjustable controls, you may wish to change the start or end
point of the effect by adjusting the keyframes in the Timeline, or use the Effect
Controls window to add additional keyframes to create an animated effect.
The effect controls in Adobe Premiere Pro work similarly to the ones in Adobe After
Effects. The settings provide exacting control over every aspect of an effect because
you can set keyframes for individual effect parameters to vary how a clip is affected
over time. When you apply an effect to a clip in the Timeline, the Effect Controls
window displays all of the parameters associated with that effect. For example, imagine that you’ve applied a Radial Blur to a clip in a timeline. The Radial Blur effect is
then listed in the Effect Controls window, where you can select and set independent
keyframes for parameters such as the Amount of blur and the X and Y position of
the blur. Rather than applying a uniform effect, you could start out with a clip that
looks crisply clear and gradually blur the clip over time, or vice-versa, start out with
a completely blurry clip that grows more clear over time. You can then evaluate the
effect design choices you’re making through the real-time editing experience
described earlier in this document. Note that these keyframes are preserved with
Adobe Premiere Pro projects when you move those projects to Adobe After Effects.
Set keyframes for individual effect parameters with complete control.
You define the beginning of the clip’s appearance by
marking an In point (the first frame that will appear
in your program). You define the end by marking an
Out point (the last frame that will appear). Initially,
you select In and Out points when you capture your
clips. Most clips are captured with extra frames at the
beginning and end to enable more precise editing
later and, often, to include overlap footage for transitions. These extra frames before the In and after the
Out points of a clip are called handles.
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It is common to fine-tune the beginning and end of
a clip just before moving a clip into the program. For
numerical precision, you will want to set In and Out
points in the Monitor window in Adobe Premiere Pro.
For visual precision, or if you prefer to use the mouse,
you can edit directly in the Timeline. Even if you use
only a small portion of a captured clip in your program, the entire clip remains available on your hard
drive, enabling you to make adjustments at any point
in the editing process.
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Trimming is a term that is sometimes used to mean
setting In and Out points. In Adobe Premiere Pro,
when you use the Trimming window, that is precisely
what you are doing, but, unlike setting In and Out
points in the Monitor window, you are affecting two
clips at once.
The term trimming is often used, as well, to refer to
the practice of removing frames from clips when you
have completed your project and you want to tidy up
your files. This function in Adobe Premiere Pro is
nondestructive.
When you use the Project Trimmer, Adobe Premiere
Pro first creates a copy of the project, just in case
you change your mind. Only those portions of clips
actually used (including specified handles) are copied;
unused clips will not be copied. If you so choose, you
can then delete the clips you originally captured, to
save disk space.
Still more ways to enhance your productions
Adobe Premiere Pro lets users create motion, picture-in-picture, and keying effects.
You can create smooth keyframed animations of flying video, controlling such parameters as rotation, scale, and distortion. Chroma, luminance, and alpha keying are
also supported in Adobe Premiere Pro. You can even use Adobe Photoshop images as
mattes, then superimpose clips with transparency to create composited sequences.
But for even more advanced control over compositing and animation (and to learn
a little bit about the techniques mentioned in this paragraph)—you’ll want to look
ahead to the section of this Primer that describes some of the sophisticated features
found in Adobe After Effects software.
Marking time
Markers indicate important points in time and, among other uses, can help you
position and arrange clips. Working with markers is much the same as working with
In and Out points, but markers are only for reference and do not alter the video
program. In Adobe Premiere Pro, each sequence and each clip can contain up to 100
numbered markers, labeled from 0 to 99, and any number of unnumbered markers.
In general, you add markers to clips to identify important points within individual
clips; you add markers to sequences in the Timeline to identify significant time
points that affect multiple clips, such as when you need to synchronize video and
audio on different clips. Timeline markers can include:
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• A comment, which will appear in the Program view of the Monitor window
WHAT IS REAL-TIME RENDERING?
• A chapter link, which can initiate a jump to a specified point in a QuickTime
movie or on a DVD
Previewing involves rendering (that is, calculating)
the frames of a sequence for playback. Sequences
that consist of cuts between single tracks of video
and audio render quickly, whearas sequences that
include layered video and audio and complex
effects require more processing time.
• A Web link, which will initiate a jump to a Web page in the browser when
the video is playing on a computer connected to the Internet or an intranet
Once upon a time, there was...
Rendering: Desktop software used to (some still
does) make you wait while it rendered. Sometimes,
rendering an effect on a desktop system would take
minutes or even hours, which would slow production to a crawl. If you wanted to generate results
instantly—that is, in real time—you had to purchase and equip your system with a real-time video
card that was compatible with your software.
Background rendering: Background rendering
still requires you to wait before you can preview
your work. You can move onto something else while
your adjustments are rendering, but if the next
thing you want to do is dependent on the results,
you’re no better off. In effect, background rendering
is like being able to do something else while your
dinner cooks, but not being able to taste the food
until it’s completely done.
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Now, however, there’s...
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Real-time software: Real-time software (such as
Adobe Premiere Pro) offers you a better option—
one that’s more supportive of your creativity, while
promoting your productivity. Adobe Premiere Pro’s
Real Time Preview capability renders the frames of
the sequence on the fly, so that in most cases, previewing simply involves playing the sequence using
any of the controls in the Program view or Timeline
window. When Adobe Premiere Pro can’t achieve
the sequence’s full frame rate, you have the choice
of playing the segment right away at a reduced
quality and frame rate, or waiting to render a preview file that can play at the full frame rate.
Sequences that have been rendered at full frame
rate for previewing need not be re-rendered for
export. Adobe Premiere Pro’s Real Time Preview
supports all Adobe Premiere Pro effects, transitions,
transparencies, motion settings, and titles.
What’s more?
Real-time hardware: Real-time hardware shunts
the processor-intensive work of rendering from the
CPU to a specialized processor on a video card. Most
real-time cards can handle the most common types
of effects, such as transitions and titles; more costly
cards can handle a much wider array of effects and
other techniques—even the capability to fly your
video around in 3D, in real time.
Make an automatic music video! Organize a sequence of clips in the Project or
Storyboard window. Then drop a series of unnumbered markers onto the Timeline,
highlighting rhythmic features as you listen to your audio track. When you perform
Automate to Sequence, your clips will be choreographed to the music, cutting in
and out at the beats you marked.
Merging creativity and productivity
One of the more time-consuming aspects of editing video on a desktop has been
waiting for productions to render before you could see how effects, transitions,
and other edit choices looked. As computers have become faster, video editing systems have introduced real-time previewing—but usually with artificial boundaries
that limit their effectiveness. Adobe Premiere Pro takes video editing to a new level
with its breakthrough real-time editing experience that enables you to see exactly
how your video will look without waiting for sequences to render.
Whether you’re making on-the-fly changes for a client or preparing to export your
final production, you’ll deliver results with unprecedented speed. Adobe Premiere
Pro plays back full-resolution frames, including titles, transitions, effects, motion
paths, and color correction on two channels, in real time with no additional
hardware support. Because it’s fast and efficient to review editing decisions as you
make them, you can experiment more freely. You could, for example, try different
settings for the effects you’re creating, and then play back each combination to
check the results and decide which one works for you. You can also view scenes
playing back in real time on an external NTSC or PAL video monitor—an incredible time win when you need to check how a work in progress will look on a final
viewing device. Your ability to increase productivity and improve edit decisions
will grow exponentially thanks to the real-time editing experience that Adobe
Premiere Pro delivers.
Note: The real-time editing experience is designed to take advantage of Pentium 4 systems, 3GHz and faster.
Playback frame rates and quality degrade gracefully on less powerful systems.
Don’t forget titles, graphics, and credits
Text and graphics can play an integral role in conveying information in a video
program. And, when you’re proud of all that you’ve accomplished, you’ll want
to include credits that acknowledge your hard work and that of everyone else
who helped create your production. Titles may include lines, shapes, images,
animations, video, and text. A title is an independent file, separate from your
project. Like any other clip, it doesn’t become part of your video program until
you add it to the Timeline, so you can use your title assets in more than one
project. You can create titles using still-graphics software applications such as
Adobe Illustrator and Photoshop, using motion graphics software such as Adobe
After Effects, or use the Adobe Title Designer built right into Adobe Premiere Pro.
The Adobe Title Designer in Adobe Premiere Pro gives you the capability to
design complex titles using customizable templates and styles created by professional designers, or develop your own custom styles that you can save and use
within other title documents. Use familiar, spline-based drawing tools to create
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and freely manipulate shapes. Import still backgrounds to appear behind your titles or view a frame of video
footage in the drawing area as you create a title to ensure that your titles will look their best as video plays
behind them. Add logos or other custom graphics with ease and use the Align and Distribute features similar
to those found in Adobe Illustrator to facilitate the design process. Incorporate any vector type font in your
system including Type 1 (Postscript), OpenType, and TrueType fonts. The Adobe Title Designer gives you the
control you’d expect over type from an Adobe product, letting you easily adjust such properties as font size,
aspect, leading, kerning, tracking, baseline shift, slant, small cap size, and more. Plus you can apply strokes,
fills, gradients, sheens, textures, shadows, glows, and more to both objects and type to create exactly the look
you want.
Although static titles, graphics, and logos may suffice for some projects, many others require titles that move
across the screen in front of your footage. Titles that move vertically (up or down) are called roll; titles that
move horizontally are called crawls. The Adobe Title Designer provides choices and settings that facilitate
creating smooth, expert rolls and crawls.
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The Adobe Title Designer in Adobe Premiere Pro
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DIGITAL AUDIO FOR VIDEO
Audio can play an equally important role to imagery in telling your story. The right voice over, music,
or sound effects can add information and impact to your video program.
Digital audio basics
You hear sounds because your ear recognizes the variations in air pressure that create sound. Analog
audio reproduces sound variations by creating or reading variations in an electrical signal. Digital audio
reproduces sound by sampling the sound pressure or signal level at a specified intervals and converting
that information to numbers that can be recorded as computer code. The quality of digitized audio and
the size of the audio file depend on the sample rate (the number of samples per second) and the bit
depth (the number of bits per sample). Higher sample rates and bit depths reproduce sound at higher
levels of quality, but with correspondingly larger file sizes. Accordingly, digitizing stereo audio requires
twice as much disk space as mono audio.
You will need to be mindful of audio sample rates in relation to the timebase and frame rate of your
project. It is a common mistake to create a movie at 30 fps with audio at 44.1 kHz, and then play back
the movie at 29.97 fps (for NTSC video). The result is a slight slowdown in the video, while the audio
(depending on your hardware) may still be playing at the correct rate and will, therefore, seem to get
ahead of the video. The difference between 30 and 29.97 results in a synchronization discrepancy that
appears at a rate of 1 frame per 1000 frames, or 1 frame per 33.3 seconds (just under 2 frames per
minute). If you notice audio and video drifting apart at about this rate, check for a project frame rate
that doesn’t match the timebase.
Sweetening and mixing audio
Sweetening audio refers to minimizing imperfections and adjusting audio qualities through the application of audio effects (aka filters). Mixing means combining audio tracks. For example, you might
combine dialogue clips with ambient background sounds and a musical soundtrack.
Adobe Premiere Pro
Audio Mixer
You can perform any combination of the following tasks in Adobe Premiere Pro:
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• Fading—that is, increasing or decreasing audio gain (the volume
levels) of audio clips over time: While watching the video program, you can adjust the gain of an audio clip at precise time
points—in the Adobe Premiere Pro Timeline window or by using
the Volume faders in the Audio Mixer to adjust and record the
volume levels for each audio track.
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• Panning/balancing stereo clips: Panning an audio clip shifts
the sound from a single (monophonic) channel to either the left
or right stereo channel. For example, you might want to pan a
dialogue clip to match a person’s movement in the video frame.
Balancing adjusts the balance of sound between the two channels
in a stereo clip. You can adjust pan and balance in the Timeline
window, or you can use the Pan control in the Audio Mixer to
precisely position audio in a stereo channel.
• Sweetening the sound and adding audio effects: Adobe Premiere
Pro provides a wide range of built-in controls for audio sweetening, aka sound processing. For example, the compressor/expander
effect fine-tunes dynamic range; the notch/hum effect removes
distracting hum; the reverb effect acoustically simulates a live
interior, and the parametric equalizer effect lets you tweak specific
frequency ranges. Like video effects, you can add multiple effects
to a single audio clip, and audio effects can also be keyframed so that they change over time. While a
variety of audio effects are included with Adobe Premiere Pro, built-in support for industry-standard
VST audio plug-ins enables you to use your favorite audio plug-ins with Adobe Premiere Pro.
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In Adobe Premiere Pro, you can create and work with multichannel audio to produce surround sound and
other richly layered audio experiences. With support for editing audio clips at the sub-frame, audio-sample
level, you can adjust audio clips with the precision of up to 1/96,000th of a second to produce exacting L-cuts
or eliminate small problems, such as the pops and crackles that sometimes occur.
When you import or capture a video clip that contains audio, the audio track is linked to its video track by
default, so that they move together. You can unlink and relink video and audio clips to perform a variety of
editing tasks. Basic editing procedures for audio-only clips are virtually identical to those for editing a video
clip, such as setting In and Out points, speed and duration. When you edit a video clip linked to an audio
clip, although the audio will appear on its own track below the Video 1 track on the Timeline, your edits are
applied to both video and audio. You can process an audio clip in several ways: choosing a menu command
for a selected clip, adjusting volume and pan/balance levels either directly in the Timeline or by using the
Audio Mixer window, or applying an audio effect.
The Adobe Premiere Pro Audio Mixer supports many convenient features. Use the Audio Mixer to capture
audio directly to the Timeline—for example, you can record live professional voiceovers to the timeline as
it’s playing back; or record notes about an edit sequence as you watch it. Adobe Premiere Pro automatically
records the voiceover live as the video plays and inserts a new clip on the specified track.
Even more sophisticated audio production
If you’ve ever looked into software for audio production, you’ve probably found that the available solutions were either too rudimentary or seemed like they’d take a rocket scientist to run. Now there’s Adobe
Audition—made to partner with Adobe Premiere Pro and After Effects. Comprehensive and versatile enough
to satisfy the demands of broadcast sound engineers and professional musicians, Adobe Audition turns your
computer into a professional multitrack recording studio—with the tools to produce high-quality audio, a
flexible workflow, and exceptional ease of use. Unlike other professional sound solutions that require you to
purchase several products to get all the functionality you’re likely to need, Adobe Audition provides multitracking, editing, looping, and effects (including more than 45 DSP effects) all in one cost-effective package.
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The Adobe Audition
interface lets you
create and mix audio
in a professional multitrack recording studio
environment while
watching your video.
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The integrated wave editing view in Adobe Audition means you don’t
need to leave the application for any of your digital audio tests.
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The precision tools in Adobe Audition give you
the power to create rich, nuanced audio at 32-bit
resolution using any sample rate up to 10MHz.
Precise sample rate conversion guarantees highquality results, and is ideal for up-sampling CD
material from 44.1kHz to 48kHz for video or 96kHz
for DVD. Make production audio useable with with
features designed to handle specific production
challenges: Adobe Audition provides sophisticated
audio restoration features and powerful mastering
and analysis tools, all running natively at
32-bit resolution.
Enhance your video soundtracks with musical
underscores, music beds, foley effects, and the ability to replace and synchronize dialog. Import AVI
files and sweeten audio tracks while you watch video
playback, then resave the AVI file with a new audio
component. The editing tools in Adobe Audition
enable you to be as precise in your cuts as you like,
with editing control down to the sample level and
Adobe Audition provides extensive support for industry-standard audio file
options to automatically detect zero-crossings.
formats, including WAV, AIFF, MP3, mp3PRO, WMA, and WMAPro.
Short crossfades can be added for clean, pop-free
cuts every time, and automation envelopes ensure
smooth transitions when applying effects, adjusting pan and volume, and more. You can change tempo
without shifting pitch or shift pitch without changing tempo thanks to high-quality stretch support.
Save time with batch processing tools that let you automate repetitive tasks such as file format conversion, matching the loudness of multiple files, and more. With the multichannel encoder, you can easily
transform any mix into a surround sound experience. Create default sessions to use as templates for
projects that share similar configurations.
When you need to quickly create new soundtracks, Adobe Audition includes thousands of high-quality,
royalty-free loops in a wide variety of musical styles, and exceptional looping controls make combining
them into new music easy. Plus, loops automatically match global session tempo and key so the music
you create sounds authentic.
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Adobe Audition includes support for the Edit Original command found in both Adobe After Effects
and Adobe Premiere Pro. When working in either of those programs, select an audio file in your project
and use the Edit Original command to open either that single file or the entire session that created it in
Adobe Audition. This integration means Adobe offers a complete, flexible, and timesaving solution for
enhancing both the audio and video components of your film and video projects.
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CREATE STUNNING VISUAL EFFECTS AND MOTION GRAPHICS
Do I really need effects and animation tools?
It is more than likely that, as you progress rapidly up the movie-making learning curve, you will want to
include more sophisticated elements in your productions. While Adobe Premiere Pro provides a wide
range of transitions and effects, as well as powerful capabilities for titling, motion graphics, transparency,
and compositing, you may also want a more specialized tool kit. Adobe After Effects lets you do more
involved tasks including sophisticated compositing of moving imagery and very precisely controlled 2D
and even 3D animations.
Leverage graphics experience into new opportunities
If you are a graphic designer, you are probably acutely aware of the way in which motion is finding its
way into your world—in everything from animated Web banners to business presentations. Your experience with Adobe Illustrator and Photoshop will make it easy for you to migrate to the world of motion
graphics, expanding your creative and business potential. Adobe After Effects lets you directly animate
layered media from Adobe Illustrator and Photoshop. Plus, the layering and compositing methodologies
in Adobe After Effects build on similar functionality in the Adobe software applications you already
know. By adding Adobe After Effects to their tool kits, many graphic designers have found new markets
for their talents in work ranging from the Web to the world of music videos and even film titles.
Why choose Adobe After Effects?
Adobe After Effects is the essential tool for motion graphics and visual effects. At almost any time, the
work of After Effects artists can be seen in broadcast, cable, and satellite programming in every part of
the world. The list of major motion pictures that have been created with the help of Adobe After Effects
is extensive, including effects-heavy films such as Monsters Inc., Gladiator, Tomb Raider,
Hannibal, Spy Kids 3D, Hulk, Bruce Almighty, The Italian Job, Cold Mountain, Hollow Man,
CHOOSE THE EDITION
and many others.
THAT’S RIGHT
FOR YOU
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Adobe After Effects 6.0 is available in two editions: Standard
and Professional.
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Designed for the most demanding production environments,
Adobe After Effects Professional
combines the core 2D and 3D
compositing, animation, and
effects tools from the Standard
edition with advanced motion
tracking and stabilization
controls, additional keying and
warping tools, over 30 additional
effects, a particle system, Render
Automation and network rendering, 16-bit per channel color, and
additional audio effects. You can
purchase Adobe After Effects
Standard for its core tools, then
upgrade to the Professional
edition as your needs grow.
Adobe After Effects offers the speed, precision, and creative control you need to produce
superb motion graphics and visual effects for film, video, multimedia, or the Web. With its
professional compositing tools, keyframe-based animation system, and extensive selection of
visual effects, After Effects delivers an unparalleled set of powerful production tools for generating dynamic openers, bumpers, titles, games, Web animations, and more. After Effects has
also spawned an entire category of third-party software and training support products.
We can’t even begin to cover all of the extraordinary capabilities of this feature-rich application
in this Primer, so if you would like to know more about Adobe After Effects 6.0 Standard or
Professional edition software, please visit www.adobe.com.
If you are new to the art of motion graphics and visual effects, some of what you are going to
read about in the next few pages may sound pretty complicated. But Adobe After Effects makes
it easy to learn. Context-sensitive menus make commands available right where you need
them, and tool tips help new users see what a tool or option does.
Build on your Adobe product skills
If you already use Adobe Photoshop, Illustrator, or Premiere, you’ll recognize the awardwinning Adobe user interface featured in Adobe After Effects. You’ll find the familiar tabbed
windows and palettes, similar tools, and common keyboard shortcuts that make it possible for
you to work more efficiently and move among the programs with ease. Productivity-boosting
features such the pen tool, Align palette, rulers and guides, editing tools, and free transform
mode work in After Effects just as they do in other Adobe products. Plus After Effects and
Premiere Pro use a similar time-based interface. Here are just a few of the ways you benefit
from After Effects integration with other Adobe applications.
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Commonly used windows in Adobe After Effects
Project window
Composition window
Tool palette
Character and
Paragraph
palettes
Effects palette
Timeline
window
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The integrated vector
paint engine provides
Adobe Photoshop-style
brushes and powerful
cloning capabilities.
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• Adobe Photoshop: Easily transform layered Photoshop images into animations. Import Photoshop
files as compositions, one at a time or in batches. After Effects preserves layers, common layer
effects, adjustment layers, alpha channels, transfer modes, vector masks, guides, and more. You can
then apply visual effects to color-correct, stylize, or manipulate each layer, and animate these layers
over time. Use Photoshop paths as masks or motion points. Text also remains fully editable and formatting is preserved when you import Photoshop files.
• Adobe Illustrator: Add carefully-crafted typography or eye-catching graphics to your video
productions. Import layered Illustrator files as compositions, one at a time or in batches. Choose
whether After Effects preserves the layers or merges them on import. Then resize the Illustrator
layers to any resolution without losing detail, and animate them with complete control. Copy paths
in Illustrator and paste them into After Effects files as masks or motion points. Preserve transparency and transfer modes. Continuously rasterize Illustrator layers in both 2D and 3D.
• Adobe Premiere Pro: Import Premiere Pro projects as compositions. Each video, audio, and stillimage clip appears on its own layer, arranged in the correct time-based sequence in the Timeline
window. Nested sequences in Adobe Premiere Pro appear as nested compositions when the project
is opened in After Effects; transparency, Cross Dissolve, and motion keyframes in Adobe Premiere
Pro appear as keyframes in After Effects; cropping in Adobe Premiere Pro appears as a mask in After
Effects. You can then manipulate these clips to create the sophisticated effects and animations best
produced in After Effects. If you use the After Effects filters included with Adobe Premiere Pro,
those effects and their associated key-frames are also imported. In addition, you can embed a link in
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MANAGEMENT
Adobe After Effects meets the
challenge of keeping dozens or
even hundreds of diverse-media
source files organized with:
• Powerful management tools:
Arrange the Project window
based on media type, name,
file size, and other attributes;
use folder hierarchies and color
coding for organizing large
projects.
• Drag and drop stacking: The
order in which you select footage in the Project window is
used to determine the stacking
order of layers when you drag
multiple items to the Timeline
window; you can drag footage
into any position in the layer
stacking order, as well as to
any point on the Timeline.
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the After Effects movies you output so that you can use the Edit Original command in
Premiere Pro to open the original project.
• Adobe Audition: Import and export audio from Adobe Audition. Use the Edit Original
command in Adobe After Effects to open either a single audio file or the session that
created it in Adobe Audition. After Effects recognizes the changes and updates your
project automatically.
• Adobe Encore DVD: Use Adobe After Effects to create motion menus for the DVDs you
author in Adobe Encore DVD. As with other Adobe applications, using the Edit Original
command in Adobe Encore DVD to open and adjust source files in Adobe After Effects.
• Adobe GoLive: When creating a marker in After Effects, you can add a URL link that will be
embedded in rendered movies. When these movies are included in Web pages created by
applications such as Adobe GoLive, the embedded URL is recognized during playback, initiating a jump to the specified URL.
Video compositing
Compositing, also known as a superimposition, is the process of combining two or more
images to yield a resulting, enriched image. Composites can be made with still or moving
images. Compositing, or superimposing, simply means playing one clip on top of another.
The terms matting and keying, in video and film production, refer to specific compositing
techniques:
• Easy file finding: Available
as both a button in the Project
window and a command on
the File menu, the Find command helps locate a source file
listed in the Project window—
no matter how deeply nested
the file is; finding files on disk is
easy with the Reveal command.
• Automatic source file reduction: The Reduce Project command clears unused source
files and compositions.
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• Keying uses different types of transparency keys to find pixels in an image that match a
specified color or brightness, and makes those pixels transparent or semitransparent. For
example, if you have a clip of a weatherman standing in front of a blue-screen background,
you can key out the blue using a blue-screen key, and replace it with a weather map.
• Matting uses a mask or matte to apply transparency or semi-transparency to specified areas
of an image. By using keying or matting to apply transparency to portions of an image that
is layered on top of another image, portions of the lower image are revealed.
Combining diverse types of media elements is one of the things for which Adobe After Effects
is best known. After Effects is the optimal program for layering media in motion because of
its extensive transfer mode support (just like in Adobe Photoshop) and its powerful masking
capabilities (up to 128 animatable bezier masks per layer), along with its wide selection of
keying methodologies.
Streamlined Editing: In order to composite video clips, you must first edit and assemble them
onto a Timeline. Those clips to which keys or mattes will be applied are placed on superimpose tracks above the Video 1 track footage. Adobe After Effects includes tools and commands that
streamline the process of constructing and refining compositions by turning time-consuming manual
tasks into operations that can be completed with a simple tool or command.
Powerful Masking: You can create, edit, and animate an unlimited number of masks on every layer in
After Effects. Draw paths to create transparencies or add new objects to an animation such as stroked
lines. Combine paths to make unusual shapes using operations such as Add, Subtract, and Intersect.
Rotate and scale masks, and apply opacity settings to make masks appear and disappear over time. Lock
masks to protect them from change. Extensive masking capabilities give you extraordinary control:
• Edit masks in the Composition window: You can copy and paste masks into your compositions
from Adobe Illustrator and Photoshop, or create masks on the fly by drawing them directly in
the After Effects Composition window. This saves time and can make it easier to adjust a mask
precisely, relative to other layers. You can also continue to create masks in the Layer window.
• Assign mask colors: Assign colors to masks for easy identification.
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• Mask Expansion property: Create and adjust the inner or outer feather of a mask by insetting or
outsetting the mask edge from the mask shape.
• Apply Motion Blur to masks: Apply Motion Blur to masks to create realistic-looking
mask animations.
2D and 3D compositing: You can work in either 2D or 3D, or mix and match on a layer-by-layer basis.
Use the 3D Layer switch to toggle a layer between 2D and 3D at any time. While both types of layers can
move horizontally or vertically, 3D layers can also animate numerous properties—such as z-position,
xyz-rotation, and orientation—in 3D space while interacting with lights, shadows, and cameras.
Use the Auto-trace feature in Adobe After Effects to quickly convert alpha channels into vector-based masks. This powerful feature makes it easy to use the edge
of an object or any key you’ve created as a path. For example, you might want to
use an alpha channel from a greenscreen shot to create an animated vector shape
or to use as the basis for text on a path.
Frame from the original footage (left)
and alpha channel (right)
We applied the Glow and Stroke effects
to the mask created by the Auto-trace
command. Because the alpha channel
is traced in each frame, the mask
animates smoothly.
Animating
Adobe After Effects provides powerful motion controls. But making things move is only one
aspect of animation, and After Effects offers an extraordinary range of features and tools to
augment your animation capabilities.
A d o b e
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Timeline implementation: Animation revolves around the concept of elements changing
over time. The ability to selectively display control curves with linear keyframe information
directly inside the Timeline window lets you fine-tune timings of multiple elements. The
Time Layout window offers flexibility for viewing and editing all object parameters.
42
Keyframe control: Keyframes are the heart and soul of moving objects, and After Effects
provides precise control over keyframe type, generation, placement, and all other aspects
of keyframe functionality. Full curve-based editing of keyframe data delivers the ability
to exactly tweak motion and animation data to fit a desired requirement for all aspects of
motion and effects over time.
Motion Sketch and Smoother: Use the Motion Sketch tool to draw animation paths as easily
as sketching with a pencil on paper. Simply select the tool and draw the animation path onscreen. Adjust your drawing speed to vary the velocity of the path. After Effects automatically
creates the keyframes for you. Then use the Smoother tool to smooth the shape of the path
and fine-tune it until the animation moves exactly as you want.
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E F F E C T S
Here, parent-child relationships were defined between different layers
to quickly create a dancing skeleton. As a parent part moves (the upper
arm), so do its children (the lower arm and hand).
A N D
M O T I O N
G R A P H I C S
Parenting: Use parenting to animate layers
hierarchically in 2D or 3D space. By defining a parent-child relationship between layers, you ensure that the child layers inherit
all of the transformations applied to the
parent. For example, when the scale and
position of the parent layer are animated,
the child layers behave the same way.
Parent-child relationships aren’t limited to
footage layers—you can also define relationships between light and camera layers
in 3D compositions. For example, define a
camera as the child to a key footage
element in a composition, so the camera
will automatically track the movement of that element.
Or a light might have a camera as a parent, so that the
elements a camera is pointing at are always illuminated.
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Text/Character Generation: Type and edit text directly in the Composition window using the Adobestandard Type tool, and format text using familiar, Adobe-standard Character and Paragraph palettes, as
well as keyboard shortcuts. If you’ve ever worked with text in Adobe Photoshop or Illustrator, you’ll be
right at home using the text tools in After Effects 6.0. You can fine-tune the look of text using kerning,
tracking, baseline shift, and other interactive options that provide instant visual feedback. Plus, text in
Photoshop files remains fully editable when you work with those files in After Effects.
43
A single text layer and
only two keyframes were
required to create this
2D text animation. We
animated Scale, Opacity,
Rotation, and Character
Offset properties for a
single text selector, so
that the property changes
resolve into a clear,
recognizable word.
Text Animation: Animating text used to be a labor-intensive process of placing every letter on a separate
layer that had to be individually animated. With Adobe After Effects 6.0, you can animate characters,
words or lines within a single text layer, animate properties that move smoothly across the same range,
and animate the entire text layer as a unit. Plus, animated text remains fully editable throughout the
design process, so making late-stage copy changes is easy. To choose which part of a text layer you want
to animate, you define a selector that applies to specific characters or a certain percentage range of the
overall text string. Because you can animate the selector, for example by moving it from the start of the
text to the end, it’s easy to create animations that ripple a property change—such as a change in color or
scale—across the text on a layer. Each selector you create can animate multiple properties, from standard
ones such as position and opacity to text-specific options such as baseline shift and tracking. You can
animate a random wiggle across a range of text, and you can also apply a wiggle to other animated
properties that apply to text. For example, you could create an animation in which a random scale
change ripples across an entire range of text, and, at the same time, wiggle the rotation of each letter
in the range.
Adding effects
Adobe After Effects delivers powerful, precise tools for creating a limitless range of visual and audio
effects from the most utilitarian color correction and audio sweetening tools to extremely sophisticated
distortion and time remapping features. Adobe After Effects comes with more than 100 effects plugins, and you can expand your effects toolkit even further with numerous third-party plug-ins. Apply
an unlimited number of effects to every layer; animate every control. Save your most frequently used
effects (including keyframes) as favorites, which you can apply instantly and share with colleagues.
Visual Excitement: You can stylize, enhance, and manipulate layers using a vast array of effects. For each
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WORKING IN 3D
Creating elaborate 3D motion graphics and
visual effects is a lot easier, in Adobe After
Effects, than you might imagine.
E F F E C T S
A N D
M O T I O N
G R A P H I C S
effect that comes with After Effects or that you add to your toolkit, there are an
unlimited number of ways to apply that effect. The effects functionality in Adobe
Premiere Pro is based on the award-winning toolset in Adobe After Effects and they
work quite similarly—you organize your effects in the Effects palette; you manipulate the properties of effects in the Effects Control window.
The ability to distort and warp elements is a key component of any compositor’s
The Effects Control window in Adobe After Effects
Using the Scribble effect, vary the look of
animated scribbles by adjusting how much
the fill wiggles, where the fill starts and ends,
where it is applied to a mask, how it is composited with the layer, and how random the
variations in the fill’s appearance appear.
• View 3D compositions from different perspectives: After Effects provides
controls for viewing a composition from
six different preset vantage points (front,
back, top, bottom, left, and right), the active
camera, and three additional user-definable
custom views. Keyboard shortcuts make it
easy to switch between views.
• Define cameras and lenses: Create
multiple cameras to produce the results
you envision. For example, you might define
a camera using a wide angle 15mm preset,
then cut to a second camera created using
a 200mm lens to capture close-ups from
a different perspective. In addition to
standard preset lenses, you can create
and save custom camera presets.
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• Define lights to illuminate layers in 3D
space: Create as many lights as you need,
and then adjust and animate each light’s
properties, controlling its illumination and
color, as well as the shadow it casts. For
example, spot lights provide dramatic
lighting effects by pointing a cone of
light at the point you define.
44
• Control how layers interact with light
sources: Specify material properties that
define how a light affects the surface of a
layer, as well as how layers interact with
lights. You can define and animate Ambient,
Diffusion, Specular, and Shininess values.
• Animate 3D layer properties: Whether
you’re working with 3D layers, lights, or
cameras, you can animate numerous
properties—such as position, rotation, and
orientation—to create a wide range of
effects. You can also automatically orient
3D layers towards a camera, or animate
lights and cameras along a path or
towards a point of interest you define.
toolkit. After Effects 6.0 expands your creative
options with Warp and Liquify tools that add
depth and
flexibility to already exceptional support for
warping and distortion.
• Liquify: When you apply Liquify, you can
distort footage using brush-based Liquify tools
similar to those in Photoshop. For example, the
Turbulence tool smoothly scrambles pixels and
is great for creating clouds, smoke, and other
similar effects. The Clone tool makes it easy to
clone the distortion from one part of an image
to another, and the Twirl tools rotate pixels
clockwise or counter-clockwise. Use the Shift
Pixels and Reflection tools to move pixels
perpendicular to the brush stroke to create the
effect of reflections in water. And work with the
Reconstruction tool to make dramatic distortions more subtle or return the footage to its
original state. Settings for each tool can be customized, and masks can be used to protect, or
freeze, areas of the footage so that the Liquify
tools don’t modify them. You can control how
quickly a distortion animates by setting
keyframes for Distortion Percentage; if you want
to apply a distortion to tracked footage, you can
offset the distortion mesh by applying tracking
data to the Distortion Mesh Offset property.
•
Warp: Instantly transform layers with the
In the sequence below,
Liquify was used to make
the cat’s eyes bulge and
add a small smile.
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A N D
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new Warp effect. Fifteen preset warp styles give you options that range from transforming layers
into regular geometric shapes—such as Arcs, Wave, and Flag—to simulating the look of objects
viewed through a fisheye lens or inflated like a
balloon. You can animate the effect easily by setting keyframes for the Bend and Distortion
properties, and you can customize each Warp Style by changing its axis and specifying a more
or less extreme Bend value.
In addition, After Effects includes Turbulent Displace and Magnify tools for creating specialized
distortions. Turbulent Displace uses fractal noise to create turbulent distortions, such as for flowing
water, waving flags, or fun-house mirrors. Magnify simulates the placement of a magnifying glass over
an area of the image, making it possible to scale an image beyond 100% while maintaining resolution.
Adobe After Effects also delivers a comprehensive set of audio effects for full-featured audio-processing.
For example, you can synchronize animation elements to audio amplitude and drive video effects using
audio data. In addition to applying audio effects to your footage, you can also change the volume levels
of audio layers, preview them at a specified quality, and identify and mark locations. Use the convenient
Audio palette to set the volume levels of an audio level, or use the Timeline window to view the waveform values and apply time remapping.
Using expressions
Just a few examples
of the Warp effects
available in Adobe
After Effects 6.0
With the expressions feature, After Effects offers support for creating arbitrary relationships between
parameters. This lets you create procedural-type animations without using keyframes. With expressions, you can create a live relationship between the behavior of one property in a composition and the
behavior of almost any other property on any other layer—opening up an infinite number of animation
possibilities. And while expressions are exceptionally powerful, they’re also easy enough to use that any
user can put them to work right away. The most straightforward expressions link one property’s behavior to that of another within the same composition. For example, the opacity of one layer could be tied
to the scale of another so that as one layer increases in size, the opacity of the other increases. Or the
tracking of path text could be linked to the rotation of another layer, so that the text tracks more tightly
as the layer rotates in one direction, then tracks more loosely as it rotates back. To create these types of
expressions, simply drag the expression pick whip from the property that is to be animated to the property that the animation will be based on—and voila! After Effects automatically creates the expression
for you. You can even drag the pick whip between the Timeline and Effect Controls windows.
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In this example, an expression is used to tie a directional blur effect to text tracking.
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If you have some familiarity with JavaScript, you can create expressions that are even more powerful.
By defining variables and using other basic JavaScript programming concepts, you can create powerful
procedural animations that stretch the limits of the imagination.
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GETTING VIDEO OUT OF YOUR COMPUTER
Once you have finished assembling and editing clips, it’s time to get your final production out of your
computer and on its way to distribution. These days, creative professionals are expected to deliver movies that can be used in multiple media. Broadcast and film professionals alike are now creating Webbased work, while Web designers may need to create animations that are output in video formats. DVD,
combining high-quality video and audio content with menu-driven interactivity, has also become an
extraordinarily popular delivery medium. To address this growing need for flexibility, Adobe Premiere
Pro and Adobe After Effects both offer a wide range of options that enable you to produce high-quality
deliverables for any medium.
The program you edited in the Timeline does not actually contain the material from which it was pieced
together—rather, it references your source files. Before export, make sure that the Timeline is ready to
output at the quality you require. For example, replace any offline files with high-resolution files suitable for final export. To get your edited program out of your computer in one piece, you can:
• Record the Timeline to physical media including videotape or motion picture film, assuming that
you have the proper hardware for video or film transfer, or have access to a service provider that
offers the appropriate equipment and services.
• Export a video file for viewing from a hard disk, removable cartridge, CD, DVD, or the Web.
• Export portions of your Timeline as clips.
• Capture stills or sequences of stills.
From Adobe Premiere Pro, you can also export:
• an EDL (edit decision list)
• an AAF (Advanced Authoring Format) file
Good housekeeping
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In professional production environments, once a video project has been completed, it must be cleared
from the editing system to make room for new work. Because the multigigabyte storage media that
would be needed is costly, and the process of uploading can be very time-consuming, projects—
including the referenced source files—are not usually saved in their entirety. If you do want to save
your entire project, you’ll want to conserve space. So, when you are satisfied with the results of your
editing, you may want to trim unused frames from some or all of your source clips and remove
unused clips in their entirety from Project Bins.
46
Typically, however, a digital master file is exported and archived, the original raw footage is stored on
tapes, and an EDL is saved. If the project needs to be revised later, the master file can often be edited.
For more extensive repurposing, the EDL can be used to generate the necessary clips from the original
tapes. Files used to develop titles, graphics, and animations, as well as portions of the project that have
undergone extreme manipulation to achieve special effects may also be archived.
Today, more and more production pros are exporting AAF files, rather than EDLs to archive or
exchange projects. AAF is a widely supported industry standard for high-end exchange of data, such
as the information necessary to transfer a video project from one platform (combination of hardware and software) to another. An AAF file helps you preserve as much of the projects integrity as
possible when you transfer it to another system. However, not all elements of a project can be
successfully transferred via AAF. Also, the application you use to open the AAF file may not support
all features. In general, an AAF file dependably translates editing data and commonly used transitions
(such as cross-dissolves and wipes) but does not support effects (filters) or audio fade and pan
information, including audio transitions.
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ROTOSCOPING
Rotoscoping involves painting
on individual frames over a series
of frames to create an animation
or to remove unwanted details in
your footage. This type of painting can be accomplished either
in Adobe After Effects or Adobe
Photoshop.
For rotoscoping in Photoshop,
you need to export the Filmstrip
format from Adobe Premiere Pro
or After Effects. You can render all
or part of a composition as a filmstrip, a single file that contains all
the frames of a composition or
portion of a composition.
Video compression is not used in
creating a filmstrip file (because
rotoscoping requires each and
every frame be available in its
entirety for painting on), so filmstrip files can be very large, but
you can break the filmstrip file
into any number of smaller files.
A filmstrip opens in Adobe
Photoshop as a series of frames
in a column, with each frame
labeled by number, reel name, and
timecode. If the column created
by the filmstrip frames is more
than 30,000 pixels tall, the frames
continue in a second column.
The number of frames displayed
depends on the duration of the
footage and the frame rate selected when you render the filmstrip.
G E T T I N G
V I D E O
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Exporting to videotape
You can record your edited program onto videotape directly from your computer. This can
be as simple as playing the Timeline and recording on a connected device. When you record
standard DV video back to standard DV tape, all that is required is an IEEE 1394 connection.
However, if plan to record DV audio and video to an analog format, such as VHS tape, you'll
need a device that is capable of converting DV to analog using the connectors supported by
your analog video recorder. Most DV cameras and all DV video tape recorders are capable of
this conversion; some DV cameras require you to record the video to DV tape, then dub the
DV tape to the analog video recorder.
Exporting to digital files
You can prepare variations of a program or clip for a variety of different uses. For example,
you can create separate versions for DVD distribution and Web viewing. Adobe Premiere Pro
and After Effects both offer built-in support for exporting the following digital video file formats: Microsoft AVI, Animated GIF, QuickTime, MPEG-1 and -2, as well RealMedia and
Windows Media files for the Web. Adobe After Effects also exports Macromedia Flash (SWF)
files. Several audio-only formats and a variety of still-image and sequence formats are also
supported by both applications. Additional file formats may be available if provided with your
video capture card or if you add third-party plug-in software.
When you export to digital files, you need to adjust settings, depending on the kind of output
you need. These settings may include such choices as the data rate for playback, the color
depth, the frame size and frame rate, the quality, and what type of compression method, or
codec, to use. Choosing compression settings is a balancing act that varies depending on the
type of video material, the target delivery format, and the intended audience. Often, the optimal compression settings are arrived at through trial and error. You should always test the files
you export on the type of platform or equipment you expect your audience to use prior to
distribution.
With Adobe Premiere Pro, you can export multiple video programs or clips to multiple files
automatically. This is known as batch processing. The Batch Processing command uses the
export settings and compression options you specify for each video file being created. You can
create and save multiple batch lists for easy, repeatable exporting of groups of projects. Batch
processing can save time and greatly simplify the following tasks:
• Exporting several video files overnight, or while you attend to something else
• Testing several different export settings files to find out which work best
• Creating versions for different media, such as videotape, CD, and Web delivery
A d o b e
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Web video
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The Web is rapidly gaining importance as a vehicle for distributing video content. From movie
trailers to training programs to sharing the experience of personal events such as weddings,
video delivered via the Internet or a corporate intranet is now a reality. If you would like to
learn more about Web video and how Adobe products make it easier than ever to take advantage of this dynamic medium, check out the Adobe Streaming Media Primer. You can download the Adobe Acrobat PDF from the Adobe Web site at www. adobe.com/smPrimer.
DVD
Adobe Encore DVD adds creative authoring for professional DVD production to the Adobe
Digital Video solution set. To learn more about DVD production and Adobe Encore DVD, take
a look at the Adobe DVD Primer! You can download the Adobe Acrobat PDF from the Adobe
Web site at www. adobe.com/dvdPrimer.
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CONCLUSION
We hope this Digital Video Primer has answered enough of your questions to encourage you to get
started. We know that once you do, you and your audience will be thrilled with the rewards upon
the screening of your first motion picture project—whether personal or professional. If you still feel
somewhat confused and hesitant, however, it’s not surprising—there is a lot to know about video.
But the best thing to do is to jump right in and learn as you go. Finding the information you need is
easy with the comprehensive HTML-based online Help included with Adobe Digital Video products.
You can also access additional help and training materials through Adobe Online located on the Help
menu. The Adobe Digital Video Collection is a great way to get started, with a comprehensive set of
easy to learn and use tools that include features to grow with.
HOW TO PURCHASE ADOBE SOFTWARE PRODUCTS
Via Web:
www.adobe.com/store
Via Phone:
Call the Adobe Digital Video and Audio Hotline at: (888) 724-4507
Education Customers:
Contact an Adobe Authorized Education Reseller at:
www.adobe.com/store/general/otherplaces/uscanada/educlist.jhtml
Free Tryouts:
www.adobe.com/products/tryadobe/
A d o b e
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V i d e o
To find the reseller nearest you, visit:
http://www.adobe.com/store/customerregistration/other_places.jhtml
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F O R
M O R E
I N F O R M A T I O N
FOR MORE INFORMATION
A variety of products and
information are available
that can be helpful to
learning and working with
digital video. The following
information is provided as
a courtesy. Adobe does
not endorse third-party
products or services. This
listing was last updated
March 2004.
BOOKS
Adobe Classroom in a Book
published by Peachpit Press
Series of hands-on software training
workbooks for Adobe products;
includes CD
www.peachpit.com
Visual QuickStart Guides
published by Peachpit Press
Concise, step-by-step instructions to
get you up and running quickly, and
later provide a great visual reference
www.adobepress.com
Applying Adobe After Effects
Studio Techniques
by Rod Harlan
published by Sams (2000)
ISBN: 0672318563
Step-by-step instructions of popular
procedures and effects; includes CD
Creating Motion Graphics
with After Effects
by Trish and Chris Meyer
published by CMP Books (2000)
ISBN: 0879306068
Techniques for creating animation,
composites, and effects; includes CD
After Effects in Production
by Trish and Chris Meyer
published by CMP Books
ISBN: 1578200776
Companion book to Creating Motion
Graphics; includes CD and tutorials
A d o b e
D i g i t a l
V i d e o
Desktop Digital Video
by Ron Grebler
published by Prompt Publications
ISBN: 0790610957
Examines hardware and software
applications, and how to utilize them.
49
Digital Nonlinear Editing: Editing
Film and Video on the Desktop
by Thomas A. Ohanian
published by ButterworthHeinemann ISBN: 024080225X
Addresses the latest developments
in digital editing for film and video
Digital Video for Dummies
by Martin Doucette
published by: Hungry Minds, Inc.
ISBN: 0764500236
Step-by-step instructions on digital
video editing using Premiere Pro
Nonlinear: A Guide to Digital
Film and Video Editing
by Michael Rubin
published by Triad Publishing
Company
ISBN: 0937404845
Covers topics including SMPTE timecode, component and composite video,
the post-production process, online
and offline editing, and much more.
VideoSyncrasies: The Motion
Graphics Problem Solver
Trish and Chris Meyer provide in-depth
information about motion graphics
and special effects in After Effects
www.desktopimages.com/ae.shtml
TRAINING RESOURCES
ADDITIONAL LEARNING RESOURCES
ADOBE CERTIFIED EXPERT (ACE)
PROGRAM
Internet Campus
Complete courses in digital
video production
www.internetcampus.com
To become an Adobe Certified Expert,
you must pass an Adobe Product
Proficiency Exam for the product
for which you want to be certified.
For more information see the
Adobe Web site at:
www.adobe.com/education/educators/ace_program.html
ADOBE CERTIFIED TRAINING
PROVIDER (ACTP) PROGRAM
For more information see the
Adobe Web site at:
http://partners.adobe.com/asn/
partnerfinder/trainingprovider/
index.jsp
CD-ROM, VIDEOTAPE, AND
WEB-BASED TRAINING
Adita Video Inc.
Adobe Premiere Pro training on
CD-ROM
www.videoguys.com/adita.html
ElementK
Online training libraries on Adobe
products. Learn at your own pace
with unlimited subscription access
for one full year.
http://adobe.elementk.com/
Mac Academy/Windows Academy
Premiere Pro training on CD-ROM
Phone: 386-677-1918
Fax: 386-677-6717
www.macacademy.com
Total Training Inc.
In-depth training on DVD for both
Premiere Pro and After Effects
Toll-free: 888-368-6825
Phone: 760-517-9001
Fax: 760-517-9060
www.totaltraining.com
VTC: The Virtual Training Company
CD and Web-based training on
Premiere Pro and After Effects
www.vtc.com/usa.php
Video University
Complete courses in digital
video production
www.videouniversity.com
Short Courses
A course in digital video
www.shortcourses.com/video/
index.htm
FREE INFO ON THE WEB
GUIDES, TUTORIALS, AND TIPS
Video Highlights by Total Training:
Adobe After Effects:
www.adobe.com/products/
aftereffects/newfeatures.html
Adobe Audition:
www.adobe.com/products/audition/
overview.html
Adobe Encore DVD:
www.adobe.com/products/encore/
overview.html
Premiere Pro:
www.adobe.com/products/premiere/
overview.html
Adobe Digital Video Primer
Download a PDF copy from
www.adobe.com/motion/
primers.html
Adobe Streaming Media Primer
Download a PDF copy from
www.adobe.com/motion/
primers.html
Master the Art of Digital Video
Download a PDF copy from
www.adobe.com/motion/events/
pdfs/dvtour.pdf
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Adobe Product Tips
http://studio.adobe.com/tips/
main.jsp
Adobe Product Support
Announcements
www.adobe.com/support/
emaillist.html
Creative Mac
Premiere and After Effects tutorials
www.creativemac.com/HTM/
Sections/Tutorials/tutorials.htm
The Mining Company
Overview of desktop video
http://desktopvideo.miningco.com
After Effects Portal
Multipurpose site with tutorials
and tips for After Effects
http://msp.sfsu.edu/Instructors/rey/
aepage/aeportal.html
After Effects Freemart
After Effects tutorials
www.aefreemart.com
ToolFarm
Tips on using network rendering,
3D channels, and Mesh Warp in
After Effects
http://store.yahoo.com/toolfarm/
index.html
FlickTips
Tips for low budget video-web
production
www.newvenue.com/flicktips
Video Guys
Helpful resource that explains many
of the new technologies related to
digital video
www.videoguys.com
INFORMATION ABOUT MPEG
• www.mpeg.org/MPEG/
• www.coolstf.com/mpeg/
A d o b e
D i g i t a l
V i d e o
INFORMATION ABOUT DVD
50
• www.dvddemystified.com/
dvdfaq.html
• www.videoguys.com/
DVDhome.html
INFORMATION ABOUT IEEE-1394
• www.oakmusic.com/parkplace/
video/techpapers.htm
• www.well.com/user/richardl/
theSilverList.html
F O R
M O R E
ONLINE GLOSSARIES
DVD Demystified Glossary
www.dvddemystified.com/
glossary.html
PC Technology Guide
www.pctechguide.com
Webopedia
www.webopedia.com
MAGAZINES
AV Video Multimedia Producer
Covers video production, multimedia,
and presentation
Phone: 847-559-7314
Fax: 847-291-4816
www.avvideo.com/Htm/
homeset2.htm
Broadcast Engineering
Covers broadcast technology
http://industryclick.com/magazine.
asp?magazineid=158&SiteID=15
Computer Videomaker
Covers camcorders, computers, tools
and techniques for creating video
Toll-free: 800-284-3226
Phone: 530-891-8410
Fax: 530-891-8443
www.videomaker.com
Digital Editor Online
Master the tools needed to make nonlinear and digital editing profitable
Phone: 888-261-9926
www.digitaleditor.com
DV (Digital Video Magazine)
Covers mainstream digital video
www.dv.com
eMediaLive
For digital studio professionals who
capture, edit, encode, publish, and
stream digital content
www.emedialive.com
Film & Video
Covers film and video production
Phone: 847-559-7314
Fax: 847-291-4816
www.filmandvideomagazine.com/
Htm/homeset.htm
Millimeter
Resource for technology trends in
animation, production and postproduction for film, video and
streaming
US Toll Free: 866-505-7173
Fax: 402-293-0741
www.millimeter.com
Post Magazine
Resource for video, audio, and
film post-production
Toll-free: 888-527-7008
Phone: 218-723-9477
Fax: 218-723-9437
www.postmagazine.com
I N F O R M A T I O N
Videography
Covers the professional video
production market
Phone: 323.634.3401
Fax: 323.634.2615
www.videography.com
Video Systems
Covers the video production process
from acquisition through presentation
US Toll-free: 866-505-7173
Fax: 402-293-0741
www.videosystems.com
NEWSLETTERS
Adobe.com
Sign up for technical support
announcements
www.adobe.com/support/
emaillist.html
About.com
Desktop video
www.desktopvideo.about.com/gi/
pages/mmail.htm
Digital Media Net
Topics related to digital
content creation
www.digitalmedianet.com/
newsletters/
DV.com
Digital video industry news
www.dv.com/newsletters/
index.jhtml
COMMUNITIES
USERS GROUPS
Adobe User to User Forums
www.adobe.com/support/forums/
main.html
DMN Forums
Home of worldwide users groups
for Adobe Premiere and Adobe
After Effects users
www.dmnforums.com
DVD Forum
International association of hardware
manufacturers, software firms and
other users of Digital Versatile Discs
www.dvdforum.org
Canopus Users Forums
http://forum.canopus.com/
DV.com Forums
www.dv.com/community/
Creative Cow
Online creative communities of the
world including Premiere Pro and
After Effects user forums
www.creativecow.net
A
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CONFERENCES
ENCODING SOFTWARE
DV Expo
http://dvexpo.com
Main Concept
One Chagrin Highlands
2000 Auburn Drive
Suite 200
Beachwood, Ohio 44122
Phone: 216-378-7655
Fax: 216-378-7656
www.mainconcept.com
Vidpro
Discussions for video and television
professionals
www.vidpro.org/subscribe.htm
NEWSGROUPS
If you use an internet application that
lets you access newsgroups, you can
read and respond to postings in the
following digital video newsgroups:
• comp.graphics.animation
• rec.video.desktop
• rec.video.production
• rec.video.professional
PROFESSIONAL ASSOCIATIONS
Digital Video Professionals
Association
www.dvpa.com
Society of Motion Pictures and
Television Engineers
www.smpte.org
V i d e o
Digital Editors
www.digitaleditor.com
D i g i t a l
I N F O R M A T I O N
Use e-mail to exchange information
and distribute questions and answers
on a particular topic.
DV-L List Server
DV and FireWire technologies
www.dvcentral.org/thelist.html
A d o b e
M O R E
MAILING LISTS
Yahoo
Premiere Pro and After Effects
mailing lists
http://groups.yahoo.com/
51
F O R
NAB (National Association
of Broadcasters)
www.nab.org
Siggraph
www.siggraph.org
THIRD-PARTY SOFTWARE
AND HARDWARE
PLUG-INS
For Adobe Premiere Pro
For detailed descriptions of thirdparty plug-ins for Premiere Pro, visit the
Premiere Pro page on the
Adobe Web site:
www.adobe.com/products/premiere/
main.html
For Adobe After Effects
For detailed descriptions of third-party
plug-ins for After Effects, visit the After
Effects page on the Adobe Web site:
www.adobe.com/products/aftereffects/main.html
CAPTURE CARDS
For a list of video capture cards that
Adobe has tested and certified for
use with Premiere Pro, visit the
Adobe Web site:
www.adobe.com/products/premiere/
6cards.html
QDesign Corporation
QDesign Music Codec
Phone: 604-451-1527
Fax: 604-451-1529
www.qdesign.com
RealNetworks
Helix Producer
Toll-free: 800-444-8011
Phone: 206-674-2700
www.realnetworks.com/
index_rn.html
Microsoft
Windows Media Technologies
www.microsoft.com/windows/windowsmedia/default.asp
Apple
QuickTime
http://developer.apple.com/
quicktime/
Sorenson Media
Sorenson Video Developer and
Basic Edition
Phone: 888-767-3676
Fax: 435-792-1101
www.sorenson.com
Discreet
Cleaner
Phone: 800-869-3504
www.discreet.com
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G L O S S A R Y
Glossary
4:1:1 color: Nonbroadcast color-sampling system in
which for every four samples of the luminance (Y)
component, one sample of each of the two chrominance
components (Cr and Cb) are taken.
4:2:0 color: Color-sampling system used for
PAL video in which for every four samples of the
luminance (Y) component, two samples of each of
the two chrominance components (Cr and Cb) are
taken but, unlike 4:2:2 color, only on every other line
of each field.
4:2:2: color: Color-sampling system used for NTSC
video in which for every four samples of the luminance (Y) component, two samples of each of the two
chrominance components (Cr and Cb) are taken.
8-bit-per-channel color: Type of color representation that stores and transmits 8 bits of information for
each of the red, green, and blue (RGB) components. In
computer terms, known as 24-bit color.
24-bit color: Type of color representation used by
most computers. For each of the red, green, and blue
components, 8 bits of information are stored and
transmitted—24 bits in total. With these 24 bits of
information, over a million different variations of color
can be represented. In digital video, known as 8-bit-perchannel color.
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24P: A high-definition (1080 lines of vertical resolution), 24 fps, progressive-display video format.
52
AAF: The Advanced Authoring Format was developed
to provide a common (open) file format to allow content to be used by different multimedia authoring and
post-production software applications. AAF is an open
standard for the interchange of essence (actual images,
video and audio clips, and so forth.) and its associated
metadata (ancillary data that describes and specifies
essence, for example: source location, timecode, transitions, effects applied)—across platforms and between
applications. Sometimes described as a super EDL solution, AAF is, essentially, a wrapper technology that can
carry either the essence itself or merely links (pointers)
to it, along with relevant metadata. Although AAF files
may contain the actual essence, the emphasis of this
format (contrast with MXF) is the exchange of composition metadata—that is, the information that describes
how essence is handled in a composition, rather than on
the exchange of the essence itself.
aliasing: A term used to describe the unpleasant jaggy
appearance of unfiltered angled lines. Aliasing is often
caused by sampling frequencies too low to faithfully
reproduce an image. There are several types of aliasing that can affect a video image including temporal
aliasing (for example, wagon wheel spokes apparently
reversing) and raster scan aliasing (such as, flickering
effects on sharp horizontal lines).
alpha channel: Color in an RGB video image is
stored in three color channels (see channel). An image
can also contain a matte (also known as a mask) stored
in a fourth channel called the “alpha channel.”
analog: The principal feature of analog representations is that they are continuous. For example, clocks
with hands are analog—the hands move continuously
around the clock face. As the minute hand goes around,
it not only touches the numbers 1 through 12, but also
the infinite number of points in between. Similarly, our
experience of the world, perceived in sight and sound,
is analog. We perceive infinitely smooth gradations of
light and shadow; infinitely smooth modulations of
sound. Traditional (nondigital) video is analog.
animatic: A limited animation used to work out film
or video sequences. It consists of artwork shot on
film or videotape and edited to serve as an on-screen
storyboard. Animatics are often used to plan out
film sequences without incurring the expense of the
actual shoot.
anti-aliasing: The manipulation of the edges of an
image, graphic, or text to make them appear smoother
to the eye. On zoomed inspection, anti-aliased edges
appear blurred, but at normal viewing distance, the
apparent smoothing is dramatic. Anti-aliasing is
important when working with high-quality graphics
for broadcast use.
architecture: In digital video, the term architecture
(sometimes also known as format) refers to the structure of the software responsible for creating, storing,
and displaying video content. An architecture may
include such things such as compression support,
system extensions, and browser plug-ins. Different
multimedia architectures offer different features and
compression options, and store video data in different file formats. QuickTime, RealVideo, and MPEG are
examples of video architectures (although MPEG is also
a type of compression).
artifact: Visible degradations of an image resulting
from any of a variety of processes. In digital video,
artifacts usually result from color compression and
are most noticeable around sharply contrasting color
boundaries such as black next to white.
aspect ratio: The ratio of an image’s width to its
height. For example, a standard video display has an
aspect ratio of 4:3.
assets: Typically, the term “asset” refers to the video
and audio clips, stills, titles, and any other materials
that comprise the content of a video production. With
the recent proliferation of media asset management
solutions, the term “asset” has come to mean a piece of
content (see essence) plus its metadata.
audio gain: Audio level or volume.
audio lead: See J-cut.
audio sweetening: Processing audio to improve
sound quality or to achieve a specific effect.
AVI: Defined by Microsoft, “AVI” stands for Audio
Video Interleave. AVI is one of the file formats for video
on the Microsoft® Windows® platform.
A
balancing: Adjusting the balance of sound between
the two channels (left and right) in a stereo clip.
batch capture: Automated process of capturing a
specified list of clips from source footage—either digital or analog media.
batch list: List of clips—identified by the timecode
for their In and Out points—to be captured via batch
capture.
binary: A type of digital system used to represent
computer code in which numerical places can be held
only by ‘zero’ or ‘one’ (on or off).
bit depth: In digital graphics and video, bit depth
indicates the number of colors the image can display. A
high-contrast (no grey tones) black and white image is
1-bit, meaning it can be off or on, black or white. As bit
depth increases, more colors become available. 24-bit
color allows for millions of colors to be displayed.
Similarly, in digital audio, bit depth indicates the number of bits per sample; the higher the number, the better
the sound quality.
BNC connector: A connector typically used with professional video equipment for connecting cables that
carry the video signal.
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camcorder: A digital video camera—that is, a device
that records sequences of continuous pictures and generates a signal for display or transfer of video footage.
To avoid confusion, it is recommended that the term
camcorder be used to designate devices used primarily
for recording video, while the term camera be used to
refer to those digital devices primarily used to record
still images.
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chrominance: The color portion of a video signal.
clip: A digitized portion of video.
CMX: A standard file format for EDLs.
codec: Short for compressor/decompressor; comprised
of algorithms that handle the compression of video to
make it easier to work with and store, as well as the
decompression of video for playback.
color sampling: A method of compression that reduces the amount of color information (chrominance)
while maintaining the amount of intensity information
(luminance) in images.
component video: A video signal with three separate
signals: Y for luminance, Cr for Chroma and red, and
Cb for Chroma and blue. Component signals offer the
maximum luminance and chrominance bandwidth.
Some component video, like Betacam and Betacam-SP,
is analog; other component video, like D1, is digital.
composite video: A video signal where chrominance
and luminance are combined in the same signal.
compositing: The process of combining two or more
images to yield a resulting, or “composite” image.
compression: Algorithms used by a computer to
reduce the total amount of data in a digitized frame or
series of frames of video or audio.
compression ratio: Degree of reduction of digital
picture information as compared to an uncompressed
digital video image.
crawling title: Text or graphics that move horizontally
left or right across the screen.
capture: If the source is analog, capture involves
digitizing to make audio or video footage usable on a
computer. Capture typically also involves the simultaneous application of compression to reduce the footage (especially video) to a manageable data rate for
processing and storage. If the source is digital, capture
typically refers to the simple transfer of audio or video
from an external device, such as a digital camcorder or
tape deck, to a computer hard drive.
cut: The simplest type of transition, in which the last
frame of one clip is simply followed by the first frame
of the next.
capture card: See video capture card.
digital: In contrast to analog, digital representations
consist of values measured at discrete intervals. Digital
clocks go from one value to the next without displaying
all intermediate values. Computers are digital machines
employing a binary system, that is, at their most basic
level they can distinguish between just two values, 0 and
1 (off and on); there is no simple way to represent all
the values in between, such as 0.25. All data that a computer processes must be digital, encoded as a series of
zeroes and ones. Digital representations are approximations of analog events. They are useful because they are
relatively easy to store and manipulate electronically.
CCD: Abbreviation for Charge-coupled Device (also
called a chip)—the sensor that detects light inside
a digital camera or camcorder. In single-chip camcorders, the CCD detects all three colors (red, green,
blue); in a camcorder with three chips, each chip
is dedicated to one of the three colors, resulting in
better-quality images.
CG: Abbreviation for Character Generator (see character generator).
CGI: Abbreviation for Computer Graphic Imagery.
channel: Each component color defining a computer
graphic image—red, green, and blue—is carried in a
separate “channel,” so that each may be adjusted independently. Channels may also be added to a computer
graphic file to define masks.
character generator: Stand-alone device or software
program running on a computer used to create text for
display over video.
DAM: Abbreviation for digital asset management;
see media asset management.
data rate: Amount of data moved over a period of
time, such as 10MB per second. Often used to describe a
hard drive’s ability to retrieve and deliver information.
digital asset management (DAM): See media asset
management (MAM).
digitize: To convert an analog audio or video signal
into a digital signal.
dissolve: A fade from one clip to another.
DTV: Digital television.
A
duration: The length of time a video or audio clip
plays—the difference in time between a clip’s In point
and Out point.
DV: Generally refers to digital video, but current usage
suggests a variety of nuances. DV can connote the type
of compression used by DV systems or a format that
incorporates DV compression. DV camcorders employ
a DV format; more specifically, a standard consumer
DV camcorder uses mini-DV tape, compresses the
video using the DV25 standard, and has a port for connecting to a desktop computer. The DV designation is
also used for a special type of tape cartridge used in DV
camcorders and DV tape decks.
DVD: Abbreviation for Digital Versatile Disc, DVDs
look like CDs but have a much higher storage capacity,
—more than enough for a feature length film compressed with MPEG-2. DVDs require special hardware
for playback.
DVI: Abbreviation for Digital Video Interface, a professional quality connection interface for high-end digital
video equipment.
DV25: The most common form of DV compression,
using a fixed data rate of 25 megabits/sec.
EDL: Edit Decision List—master list of all edit In and
Out points, plus any transitions, titles, and effects used
in a film or video production. An EDL can be sent to an
edit controller—a device that interprets the list of edits
and controls the decks or other gear in the system to
recreate the program from master sources.
effect: Distortion of a frame or frames of video to
change its appearance.
essence: In media asset management formats such as
AAF, that portion of the digital signal comprising the
actual visual and aural information (video, graphics,
text, animation, music, sounds, and dialogue). Contrast
with metadata.
A d o b e
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fields: The sets of upper (odd) and lower (even)
lines drawn by the electron gun when illuminating the
phosphors on the inside of a standard television screen,
thereby resulting in displaying an interlaced image. In
the NTSC standard, one complete vertical scan of the
picture—or field—contains 262.5 lines. Two fields
make up a complete television frame—the lines of field
1 are vertically interlaced with field 2 for 525 lines of
resolution.
54
final cut: The final video production, assembled from
high-quality clips, and ready for export to the selected
delivery media.
FireWire:
IEEE 1394.
The Apple Computer trade name for
four-point edit: An edit used for re-placing footage
in a program when the precise In and Out points of
the clip to be inserted and the portion of the program
to be replaced are critical and are, therefore, specified
by the editor. The four-point editing feature in Adobe
Premiere Pro alerts the editor to any discrepancy in the
two clips and automatically suggests alternatives.
FPS: Frames per second; a method for describing
frame rate.
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frame: A single still image in a sequence of images
which, when displayed in rapid succession, creates the
illusion of motion—the more frames per second (FPS),
the smoother the motion appears.
frame rate: The number of images (video frames)
shown within a specified time period; often represented
as FPS (frames per second). A complete NTSC TV picture consisting of two fields, a total scanning of all 525
lines of the raster area, occurs every 1/30 of a second.
In countries where PAL and SECAM are the video standard, a frame consists of 625 lines at 25 frames/sec.
fullscreen: Format that utilizes the entire aspect ratio
of a standard (4:3) television screen.
generation loss: Incremental reduction in image or
sound quality due to repeated copying of analog video
or audio information and usually caused by noise introduced during transmission. Generation loss does not
occur when copying digital video unless it is repeatedly
compressed and decompressed.
handles: Extra frames specified before the In and Out
points of a clip that may be needed to accommodate
transitions or editing adjustments.
headroom: When capturing audio, extra data
acquired as a result of capturing at higher quality settings than needed for the final cut. Headroom helps
preserve quality when adjusting audio gain or applying
certain audio effects.
horizontal resolution: The number of pixels across
each horizontal scan line on a television.
IEEE 1394: The interface standard that enables the
direct transfer of DV between devices such as a DV
camcorder and a computer; also used to describe the
cables and connectors utilizing this standard.
i.LINK: The Sony trade name for IEEE 1394.
In point: The point in a source clip at which the material used in a video program begins.
insert edit: An edit in which a series of frames
is added, lengthening the duration of the overall
program.
interframe compression: Reduces the amount
of video information by storing only the differences
between a frame and those that precede it. (Also known
as temporal compression.)
interlacing: System developed for early television
and still in use in standard television displays. To compensate for limited persistence, the electron gun used
to illuminate the phosphors coating the inside of the
screen alternately draws even, then odd horizontal lines.
By the time the even lines are dimming, the odd lines
are illuminated. We perceive these “interlaced” fields of
lines as complete pictures.
intraframe compression: Reduces the amount of
video information in each frame, on an individual basis.
(Also known as spatial compression.)
J-cut: A type of split edit where the audio In point is
earlier than the video In point so that the audio begins
to be heard during the previous video clip. Also known
as an audio lead.
A
D V
JPEG: File format defined by the Joint Photographic
Experts Group of the International Organization for
Standardization (ISO) that sets a standard for compressing still computer images. Because video is a sequence
of still computer images played one after another,
JPEG compression can be used to compress video (see
MJPEG).
key: A method for creating transparency, such as a
blue-screen key or a chroma-key.
keyframe: A frame selected at the beginning or end
of a sequence of frames, that is used as a reference for
any of a variety of functions. For example, in interframe
video compression, keyframes typically store complete
information about the image, while the frames in
between may store only the differences between two
keyframes; or, in applying an effect to a video clip,
keyframes may contain values for all the controls in
the effect and, when the values are different for the
beginning and ending keyframes, the effect will change
over time.
keyframing: The process of creating an animated
clip by selecting a beginning image and an ending
image whereby the software automatically generates the
frames in between (similar to “tweening”).
keying: The technique of using a key to apply transparency when superimposing video clips.
L-cut: A type of split edit where the audio Out point is
later than the video Out point so that the audio continues to be heard with the next video clip.
log: A list of shots described with information
pertinent to content or other attributes; or the act of
creating such a list.
lossless: A process that does not affect signal fidelity; for example, the transfer of DV via an IEEE 1394
connection.
lossy: Generally refers to a compression scheme or
other process, such as duplication, that causes degradation of signal fidelity.
luminance: Brightness portion of a video signal.
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MAM: Abbreviation for media asset management.
55
markers: Markers are used in the editing process to
indicate important points in the Timeline or in individual clips. Markers are for reference only; they do not
alter the video program.
mask: See matte. The term “mask” is usually used in
working with still images, while the term “matte” is
typically used in film and video post-production.
matte: An image that specifies an area of another
image, most often used to apply transparency, semitransparency, or some other effect to the area specified.
Also see mask.
matting: The technique of using a matte to specify
transparency when superimposing video clips.
media asset management (MAM): Also known
as digital asset management (DAM), MAM is, in
practice, the warehousing of multimedia content in a
manner that is referencable and retrievable via a relational database. Each item of visual or aural content
P r i m e r :
G L O S S A R Y
(images, graphics, animations, video, audio)—that is,
the essence—is linked to critical information about
that content, kown as metadata—that may include,
for example: creation date, a description, the equipment (camera or recorder) that recorded the material,
timecode, and so forth. Together, the essence and the
metadata for a single item comprise an asset. One of
the most significant features and benefits of a MAM is
that assets can also be linked to other systems, such as
financial databases.
metadata: In media asset management formats such
as AAF, that portion of the digital signal comprising
ancillary information such as description, source, timecode, and so forth. Contrast with essence.
MJPEG: Motion JPEG.
motion control photography: A system for using
computers to precisely control camera movements so
that different elements of a shot can later be composited in a natural and believable way.
motion effect: Speeding up, slowing down, or
strobing of video.
MPEG: Abbreviation for the Motion Pictures
Expert Group of the International Organization
for Standardization (ISO) which has defined multiple standards for compressing audio and video
sequences. Setting it apart from JPEG which compresses individual frames, MPEG compression uses a
technique where the differences in what has changed
between one frame and its predecessor are calculated
and encoded. MPEG is both a type of compression
and a video format. MPEG-1 was initially designed
to deliver near-broadcast quality video through a
standard speed CD-ROM. Playback of MPEG-1
video requires either a software decoder coupled
with a high-end computer, or a hardware decoder.
MPEG-2 is the broadcast quality video found
on DVDs. It requires a hardware decoder (for example, a
DVD-ROM player) for playback.
MXF: The Material eXchange Format is a “wrapper”
technology designed to facilitate asset interchange
between different multimedia and post-production
software applications. Like AAF (of which it can be
an object subset), MXF is an open standard for the
exchange of essence (actual images, video and audio
clips, and so forth.) and its associated metadata—
across platforms and between applications. MXF was
designed for less complesx metadata applications than
AAF—while AAF may carry the actual essence or only
a link to it, MXF always carries the essence itself along
with the metadata—the primary objective of MXF
being the streamlined exchange of the essence itself
with its associated metadata. MXF files may be used as
a source for AAF. With its greater emphasis on actual
essence exchange, MXF is better optimized than AAF for
real-time streaming of video and audio assets, making it
an excellent solution for such applications as broadcast
news editing.
NLE: A nonlinear editing computer system.
noise: Distortions of the pure audio or video signal
that would represent the original sounds and images
recorded, usually caused by interference.
A
nonlinear editing: Random-access editing of video
and audio on a computer, allowing for edits to be
processed and reprocessed at any point in the timeline,
at any time. Traditional videotape editors are linear
because they require editing video sequentially, from
beginning to end.
NTSC: National Television Standards Committee
standard for color television transmission used in the
United States, Japan and elsewhere. NTSC incorporates
an interlaced display with 60 fields per second, 29.97
frames per second.
offline editing: The practice of editing a rough cut
using low-quality clips, then producing the final cut
with high-quality clips, usually on a more sophisticated editing system than that used for developing the
rough.
OMF aka OMFI: The Open Media Framework (or
Open Media Framework Interchange) format is a
media and metadata exchange solution introduced
prior to AAF. It was not broadly adopted but, as the
industry transitions to the more widely accepted AAF
standard, more applications and utilities are facilitating
support for the OMF interchange.
online editing: The practice of doing all editing
(including the rough cut) on the same clips that will be
used to produce the final cut.
Out point: The point in a source clip at which the
material used in a video program ends.
PAL: Phase-alternating line television standard popular in most European and South American countries.
PAL uses an interlaced display with 50 fields per second,
25 frames per second.
panning: Moving a camera horizontally or vertically
as a scene is being shot. Also, shifting sound from or to
either the left or right stereo channel.
phosphor: A luminescent substance, used to coat
the inside of a television or computer display, that is
illuminated by an electron gun in a pattern of graphical
images as the display is scanned.
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pixel: An abbreviation for picture element. The minimum computer display element, represented as a point
with a specified color and intensity level. One way to
measure image resolution is by the number of pixels
used to create the image.
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poster frame: A single frame of a video clip selected
to be used as an icon to represent and identify that clip
in parts of the Adobe Premiere Pro interface.
post-production: The phase of a film or video project that involves editing and assembling footage and
adding effects, graphics, titles, and sound.
preproduction: The planning phase of a film or
video project—usually completed prior to commencing production.
previsualization: A method of communicating
a project concept by creating storyboards or rough
animations or edits.
print to tape: A command for exporting a digital
video file for recording onto videotape.
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production: The phase of a film or video project
comprised of shooting or recording raw footage.
program monitor: Window on the Adobe Premiere
Pro interface that displays the edited program.
progressive display: A method for displaying
sequential images such as the frames comprising film
or video, whereby the entire image is shown at once;
contrast with interlacing.
project: File with all information pertaining to a job,
including settings and source material.
prosumer: Term used to define a market segment
for video equipment and software, comprising serious
hobbyists or those whose primary profession is not
video production, but who create and use videos as
part of their job or who earn extra money by producing videos.
pulldown: Technique used in telecining to get the
24 fps rate of film up to the approximately 30 fps rate
of NTSC video or the 25 fps rate of PAL video and
o handle the conversion from progressive frames to
interlaced fields.
QuickTime: A multi-platform, industry-standard,
multimedia software architecture developed by Apple
and used by software developers, hardware manufacturers, and content creators to author and publish
synchronized graphics, sound, video, text, music, VR,
and 3D media. QuickTime 4 includes strong support
for real-time (RTSP) streaming.
RAID: RAID, an acronym for Redundant Array of
Independent Disks, is a digital data storage subsystem
comprised of multiple hard disks which, to a workstation operating system, appear to behave as a single
unit.
RCA connector: A connector typically used for
cabling in both audio and video applications.
RealMedia: Architecture designed specifically for
the Web, featuring streaming and low data-rate compression options; works with or without a RealMedia
server.
real-time: In computing, refers to an operating
mode under which data is received, processed, and the
results returned so quickly as to seem instantaneous. In
an NLE, refers to the result of effects and transitions
appearing without an interruption for rendering.
rendering: The process of mathematically calculating the result of a transformation effect on a frame
of video.
resolution: The amount of information in each frame
of video, normally represented for digital displays by
the number of horizontal pixels times the number of
vertical pixels (such as 720 x 480); for television, by
the number of vertical scan lines (for example, 525 for
NTSC). All other things being equal, a higher resolution
will result in a better quality image.
RGB: Red-Green-Blue—a way of describing images
by breaking a color down in terms of the amounts of
the three primary colors (in the additive color system),
which must be combined to display that color on a
computer monitor.
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ripple edit: Automatic forward or backward movement
of program material in relationship to an inserted or
extracted clip, or to a change in the duration of a clip.
rolling edit: Automatic change in the duration of a
program when a clip is inserted or extracted, or when the
duration of a clip is altered.
rolling title: Text that moves vertically up or down across
the screen.
rotoscoping: Painting on individual frames over a series
of frames to create an animation or to remove unwanted
details in film or video footage.
rough cut: A preliminary version of a video production,
often assembled from lower quality clips than those used
for the final cut.
sample rate: In digital audio, the number of samples
per second; the higher the number, the better the sound
quality.
SAN: A Storage Area Network is a data storage subsystem that may provide terabytes of capacity and
can be simultaneously accessed by multiple users. A SAN
may be JBOD (Just a Bunch of Disks) or comprised of
multiple RAIDs.
scrubbing: Variable-rate backward or forward movement through audio or video material via a mouse, keyboard, or other device.
SECAM: Similar to PAL at 25 FPS, the SECAM format is
employed primarily in France, the Middle East, and Africa.
It is only used for broadcasting. In countries employing
the SECAM standard, PAL format cameras and decks are
used.
SDI: Serial Digital Interface is a professional digital video
connection format with a 270 Mbps transfer rate. SDI uses
standard 75-ohm BNC connectors and coax cable.
six-point edit: See split edit.
slide edit: An edit that adjusts the previous clip’s Out
point and the next clip’s In point without affecting the clip
being slid or the overall program duration.
slip edit: An edit that adjusts the In and Out points of a
clip without affecting the adjacent clips or affecting overall
program duration.
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spatial compression: See intraframe compression.
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speed: The playback rate of a video or audio clip compared to the rate at which it was recorded.
split edit: A technique resulting in a clip’s video and
audio beginning or ending at different times. Also see
L-cut and J-cut.
storyboard: A series of sketches or still images outlining material to be shot on film or video, or indicating a
sequence of clips to be edited together.
streaming: Process of sending video over the Web or
other network, allowing playback on the desktop as the
video is received, rather than requiring that the file be
downloaded prior to playback.
superimposition: A composite, or layered image involving transparency; also see compositing.
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S-Video: Short for Super-Video, a technology for
transmitting video signals over a cable by dividing the
video information into two separate signals: one for
luminance and the other chrominance. (S-Video is
synonymous with Y/C video).
telecine: Refers to the combination of process, equipment, and software used to translate film to video.
temporal compression: See interframe compression.
three-point edit: An edit in which a clip is inserted into
an existing program, where only three of the four In and
Out points of the clip to be inserted and the portion of the
program to be replaced are known. The three-point editing
feature in Adobe Premiere Pro automatically specifies the
fourth point.
time code: Time reference added to video that allows
for extremely accurate editing; may be thought of as the
“address” on a tape that pinpoints where the clip begins
(in) and ends (out).
timecode log: See batch list.
timeline: On an NLE interface, the graphical representation of program length onto which video, audio, and
graphics clips are arranged.
titler: See character generator.
track: In the Adobe Premiere Pro Timeline window, video
clips are arranged on tracks, which are similar to the layers found in many other Adobe applications. When clips
are placed one above another, both clips will play back
simultaneously. The Video 1 track is the main video editing track; all tracks above Video 1 are for superimposing
clips over the Video 1 track; all tracks below Video 1 are
for audio.
transcoding: Translating a file from one file format into
another; that is, re-encoding the data.
transition: A change in video from one clip to
another. Often these visual changes involve effects where
elements of one clip are blended with another.
transparency: Percentage of opacity of a video clip or
element.
trimming: May refer to setting the In and Out points
of a clip (usually with handles) or to actually removing
unneeded portions of clips.
uncompressed: Raw digitized video displayed or stored
in its native size.
vertical resolution: The number of horizontal scan lines
(counting from top to bottom) that the electron beam
draws across a television screen to form the picture.
video capture card (or board): Installed inside a
computer, adds the functionality needed to digitize
analog video for use by the computer. Using a hardware
or software codec, the capture card also compresses video
In and decompresses video Out for display on a television
monitor.
voice over: The voice of an off-camera narrator or other
speaker that is heard when video of the speaker is either
not seen or not synchronized with the sound.
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widescreen: Any aspect ratio for film and video wider
than the standard 4:3 format; previously used to refer to
wide-aspect film formats; now typically used to refer to the
16:9 format that has become standard widescreen for DVD,
because this is the aspect ratio specified for HDTV.
XLR connector: A connector with three conductors used
in professional audio applications, typically with a balanced signal.
Y/C video: A video signal where the chrominance and
luminance are physically separated to provide superior
images (synonymous with S-Video).
YCC: A video signal comprised of the luminance—the
Y—component and two chrominance (color)— C— components.
YUV: Another term for YCC.
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zooming: Moving the focus of a camera either closer to
or further away from a subject while shooting.
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Adobe, the Adobe logo, Adobe Audition, Adobe Encore, Adobe Premiere, After Effects, GoLive, Illustrator, and Photoshop are registered trademarks or trademarks of Adobe Systems Incorporated
in the United States and/or other countries. Apple and Mac are trademarks of Apple Computer, Inc., registered in the United States and other countries. Macromedia and Flash are trademarks
or registered trademarks of Macromedia Inc. in the United States and/or other countries. Microsoft, Windows, and WindowsMedia are either registered trademarks or trademarks of Microsoft
Corporation in the United States and/or other countries. All other trademarks are the property of their respective owners. © 2004 Adobe Systems, Inc. All Rights Reserved.
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