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As mentioned before, the AVI container format can hold a lot of different types
of compressed video, including MPEG4 which had great quality for the file size
and is almost universally compatible. However, the AVI format is somewhat
inefficient for holding AVI and doesn't diretcly support B frames, so a plain
.mpg file is better - smaller for the same quaility with slightly better
compatibility if nonstandard hacks are used for B frames in the AVI.
A WMV with Microsoft's non-standard version of MPEG4 is OK, but not as
widely compatible as straight .mpg files. Flash video uses mpeg4, so
you can also set your Flash applet to stream an MPEG4 .mpg file from the
server and also provide a direct link to the same .mpg for the 15% or so
of users you can't install a good Flash player because they are running 64 bit
systems or whatever other reason.
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