on 7/18/01 12:00 PM, iodine at [EMAIL PROTECTED] wrote:
> MPEG 4 is based on quicktime, right?
The file format is, yes. But there are some differences that keep them
from being fully cross-compatible right now.
> And WMP's .wmv files can be made ISO MPEG4 compatible, too.
No. They include an ISO compatible video format, but not support for
audio or the file format.
> So, one would think that quicktime should be able to play an ISO MPEG4
> compatible file [especially if re-suffixed to .mpg]
Nope. Windows Media is making an ASF formatted file, which is a
proprietary format QuickTime can't read, nor will ISO MPEG-4 players be able
to read it.
> But it doesn't.
>
> The implications if it did are that we have finally hit on a good quality
> cross platform stream format.
You're on the right track - MPEG-4 is designed to be that.
>
> Can anyone tell me where my logic and/or knowledge is faulty?
Support isn't widespread yet. Apple has announced that they will make
"MPEG-4 a first-class media type under QuickTime." So, some future version
of QuickTime will be able to read ISO MPEG-4 files. Microsoft hasn't
announced what their plans are here.
Ben Waggoner
Interframe Media <http://www.interframemedia.com>
Digital Video Compression Consulting, Training, and Encoding
Check out my Stanford compression classes:
<http://newmedia.stanford.edu/courses_video.html>
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