Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 621

In the Video Compression dialog box, choose a compressor from the first menu in the Compressor section.
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Choose a compressor based on the type of original images you have and the purpose of the rendered movie (available
compressors depend on the Video for Windows codecs installed on your computer).
You can render with 10-bpc YUV compression to create 10-bpc AVI files for use with HD footage in Adobe Premiere
Pro: choose 10-bit YUV (4:2:2 YUV) from the Compressor menu.
Select a Compression Quality level.
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6 If you selected either Cinepak or Microsoft Video 1 in step 4, click the Configure button to set other options:
• For Cinepak, choose whether the movie is compressed to color or to black and white.
• For Microsoft Video 1, choose a level for the temporal compression quality of the movie. Temporal compression
compresses a movie by comparing successive frames and keeping only changed data. High temporal quality
maintains smoothness of motion. Lower temporal quality tends to produce jerkiness of motion because a pixel
doesn't change unless the difference between frames is great.
If you want the smallest possible files, and your compressor choice allows for a key frame rate, select the Key
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Frame Every option and type a number of frames. Generally, you should type a number equal to the frame rate. For
example, if you set a frame rate of 30 fps, type 30 in the Key Frame box. This sets one key frame every 30 frames of
your movie.
Note: If you are going to use the resulting movie in another After Effects composition, type a small value (less than 5) in
the Key Frame Every field or deselect the Key Frame Every option. The presence of keyframes greatly increases the
memory required to edit and render a movie.
Click OK.
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If your compressor choice supports different image color depths, choose the appropriate color depth in the Output
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Module Settings dialog box.
Specify other settings in the Output Module Settings dialog box, and then click OK.
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See also
"Work in the Render Queue panel" on page 585
"Work with output module settings" on page 594
Video for Windows compression options
Use for lossless compression limited to 256 colors.
Microsoft RLE
Use for digital video camcorders.
Microsoft DV
Use for a depth setting of Millions Of Colors+ when an alpha channel is required.
No Compression
Intel Indeo/Microsoft Video
Use when compressing 16-bit and 24-bit video for playback from CD or for desktop presentations. For best
Cinepak
results, use the Cinepak compressor on raw source data that has not been previously compressed with a highly lossy
compressor. Note that this is a slow compression method. With Cinepak, decompression is much faster than
compression, and the data rate for playback can be defined by the user. However, you cannot save an alpha channel
using the Cinepak compressor.
Use when compressing video for playback from CD.
AFTER EFFECTS CS3 615
User Guide