At 8:00 PM +0100 7/18/01, iodine wrote:
>MPEG 4 is based on quicktime, right?
Yes, but with slight variations. Also, although the file format is
very similar, there are new codecs involved that need to be added to
QT.
>And WMP's .wmv files can be made ISO MPEG4 compatible, too.
No. They can contain MPEG4 video data, but they wrap it in a
proprietary patented format that only MS's code will read. They have
sued companies that reverse engineer it.
>So, one would think that quicktime should be able to play an ISO MPEG4
>compatible file [especially if re-suffixed to .mpg]
It will be able to in future; this work is underway, and has been
demonstrated at NAB & WWDC. It is not part of QuickTime 5. The
extension will be .mp4 - it is a different file format than mpeg 1 &
2.
>But it doesn't.
>
>The implications if it did are that we have finally hit on a good quality
>cross platform stream format.
What do you mean by 'cross platform' in this context? QT, WM and Real
are all available on both Mac and Windows.
MPEG4 streamed over RTP should indeed be a good cross-platform
format, and the platforms it is expected to be implemented on go
beyond computers to 3G wireless devices. The industry group working
on making this happen is the ISMA:
http://isma.tv/
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