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APPENDIX B
354
Compressing Video and Audio
Microsoft RLE
Useful for compressing frames that contain large areas of flat color, such as
cartoon-style animation. This codec uses a spatial 8-bit run-length encoding (RLE)
compressor and is lossless at the 100% quality setting.
Microsoft Video 1
Useful for compressing analog video. This lossy, spatial codec supports
pixel depths of 8 or 16 bits.
Intel Indeo Video R3.2
Useful for compressing 24-bit video for playback from CD-ROM discs.
This codec attains higher compression ratios, better image quality, and faster playback speeds
than the Microsoft Video 1 codec. For best results, use the Indeo Video codec on raw source
data that has not been previously compressed with a highly lossy codec. When used with a data
rate for playback, this codec produces movies that are comparable in quality to those
compressed with the Cinepak codec.
Cinepak Codec by Radius
Useful for compressing 24-bit video intended for CD-ROM discs
or for downloadable Web video files. This codec attains higher compression ratios and faster
playback speeds than the Video codec. You can set the data rate for playback; picture quality
drops more noticeably at data rates below 30 KBps. Cinepak is asymmetrical—it decom-
presses quickly, but compression is slow enough to make it impractical for editing. For best
results, use Cinepak only for exporting the final version of a video file.
Video for Windows audio codecs (Windows only)
When editing, the following software codecs are provided if you choose Video for Windows
from the Editing Mode menu in the General Settings panel of the Project Settings dialog box.
When exporting, the following software codecs are provided if you choose Microsoft AVI from
the File Type menu in the General Settings panel of the Export Movie Settings dialog box, or
Windows Waveform from the File Type menu in the General Settings panel of the Export
Audio Settings dialog box.
The audio codecs themselves appear in the Type menu in the Audio Settings panel of its dialog
box. In general, use a codec specifically designed for the type of audio in your program, such
as speech, music, or multimedia. Avoid codecs intended for telephony unless your audio is
almost exclusively speech to be delivered over low-bit-rate media such as the Web.
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