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Appendix B: Compressing Video
and Audio
D
igital video involves storing, moving, and calculating extremely large volumes of data
compared to other kinds of computer files. The data rate and file size of uncompressed
digital video can overwhelm many personal computers and hard disks. Use compression
to lower the data rate of digital video into a range that your computer system can handle.
Understanding scenarios that affect compression
As you build your video program in Premiere, compression settings are most relevant
when capturing source video, previewing edits, playing back the Timeline, and exporting
the Timeline. In many cases, the settings you specify won't be the same for all situations.
The following guidelines can help you determine the proper compression settings:
When capturing source video, use compression settings that lower the data rate just
•
enough to preserve maximum quality and play back smoothly on the editing computer.
If you're using a video-capture card, use the codec included with the video-capture card.
You specify compression settings for capture in the Capture Settings dialog box (see
"Preparing for video capture" on page 93).
When previewing edits, compression settings affect how long you wait for edits to be
•
processed before the Timeline is played back. Start by specifying the same compression
settings you used for capturing, especially if you use a video-capture card for capturing and
editing. If you're using the QuickTime editing mode, try Motion JPEG A or B; if you're using
the Video for Windows editing mode, try Microsoft Video 1. If it still takes too long to wait
for the Timeline to play back, you can try reducing the frame size or frame rate. You specify
compression settings for previewing in the Video Settings and Keyframe and Rendering
Options dialog boxes (see "Video settings" on page 61 and "Keyframe and rendering
options" on page 64).
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