When you create a movie that you plan to play back with QuickTime, consider
the following factors:
* You must have a compressor/decompressor for both Video for Windows and
QuickTime environments.
* To ensure a movie file plays effectively, author it to reflect the
restrictions of the Macintosh hardware.
* Optimum interleaving for QuickTime is different from that of Video
for Windows.
In order to play back a compressed AVI file on the Macintosh, the compatible
decompressor for that file must exist on the Macintosh. Currently supported
are: Microsoft Video 1, Microsoft RLE, Microsoft Full Frame, and Cinepak by
SuperMatch (if you have the Apple Compact Video or the Apple Cinepak
installed).
By default, Video for Windows creates CD-ROM movie files that play back at 150 KBytes per second, the standard CD-ROM data-transfer rate for multimedia personal
computers. However, CD-ROM drives on many Macintoshes do not have the same
playback capacity. Playback rates in the 90-100 KBytes per second range are
common. If you play back a movie file authored for 150 KBytes per second
playback on such a CD-ROM drive, you are likely to experience problems
(for example, audio breakup or dropping frames from the video). To ensure
successful playback on the widest possible range of Macintosh hardware,
capture the movie file at 90 KBytes per second. If your target platform is
higher-end Macintosh machines, you may be able to capture at a higher
frame rate.
Video for Windows normally interleaves audio with every frame of video. For
optimum playback on the Macintosh, you should change the interleaving factor
so that audio is interleaved every second of video. For example, if your movie file
plays at 15 frames per second, specify an interleaving factor of 15.
When you convert a compressed QuickTime movie to a compressed AVI file,
consider the following factors:
* You must have a compressor/decompressor for both Video for Windows and
QuickTime environments.
* You may wish to adjust the quality and temporal settings for each compressor.
The AVI files will not play back on Video for Windows, unless a decompressor
for that compressor exists. Currently supported are: Apple Compact Video
(also called Apple Cinepak), Microsoft RLE, Microsoft Full Frame and
Microsoft Video 1.
The quality and temporal settings for the Video for Windows Converter are
both set to High. You may be able to improve the visual quality of the movie
by increasing the quality and temporal settings for the compressor.
Increasing these settings will have a direct effect on the resulting file
size: the higher the quality, the larger the file size. (To change the
temporal setting, move the mouse pointer onto the quality slider, and press
the Option key.)
4. FINAL RELEASE NOTES
======================
The Video for Windows Converter:
Files converted to AVI format with the Video for Windows Converter are not
interleaved. To improve playback of these files on a CD-ROM, you may want
to interleave the files again with VidEdit or some other tool.
The AVI to QuickTime Utility:
Files compressed with versions of Cinepak for Windows earlier than 1.5.0.29 may
display artifacts when played back on the Macintosh. Recompress
those source files with Cinepak for Windows version 1.5.0.198 or later. Version information on Cinepak may be obtained through the Drivers applet in your Windows Control Panel.
You might significantly improve the playback of AVI files on the Macintosh
by increasing the preferred memory requirements of MoviePlayer.
This can be done with the Get Info command in the Finder.