Video for windows compression settings – Adobe After Effects CS4 User Manual
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USING AFTER EFFECTS CS4
Rendering and exporting
Last updated 12/21/2009
In QuickTime terminology, the term key frames refers to something different from the change-over-time keyframes
placed in the After Effects Timeline panel. In QuickTime, key frames are frames that occur at regular intervals in the
movie. During compression, they are stored as complete frames. Each intermediate frame that separates them is
compared to the previous frame, and only changed data is stored. Using key frames greatly reduces movie size and
greatly increases the memory required to edit and render a movie. Shorter intervals between key frames enable faster
seeking and reverse playback, but can significantly increase the size of the file.
7
Click OK.
8
If your compressor choice supports different image color depths, choose the appropriate color depth in the Output
Module Settings dialog box:
•
Choose Millions Of Colors+ if you want 24-bit color quality and you want your composition background to be
transparent (to include an alpha channel). The composition background color is disregarded.
•
Choose Millions Of Colors if you want 24-bit color quality but want to include your composition background color
(no alpha channel).
Note: Color depth settings of Thousands Of Colors or lower may cause banding and dithered images.
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Specify other settings in the Output Module Settings dialog box, and then click OK.
More Help topics
Render and export with the Render Queue panel
Output modules and output module settings
Video for Windows compression settings
1
In the Render Queue panel, click the underlined name of the output module.
2
Choose Video For Windows from the Format menu.
3
Click Format Options in the Video Output section.
4
In the Video Compression dialog box, choose a compressor from the first menu in the Compressor section. Choose
a compressor based on the kind 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). Choose No Compression for
a depth setting of Millions Of Colors+ when an alpha channel is required.
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.
5
Select a Compression Quality level.
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.
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If you want the smallest possible files, and your compressor choice allows for a key frame rate, select the Key Frame
Every option and enter a number of frames. Generally, you should enter a number equal to the frame rate. For
example, if you set a frame rate of 30 fps, enter 30 in the Key Frame box.