[MPlayer-dev-eng] patch: YUV4MPEG2 demuxer

[Rik Snel]

Hello,

On Thu, 27 Dec 2001, Alex Beregszaszi wrote:
> > > > Scenario: mjpegtools generate header "YUV4MPEG2 BLA BLA BLA\n". The first
> > > > call to read_stream_char reads the header. (because the rest is not
> > > > available yet) Some check_fileformat functions want to see more of the
> > > i've moved detection code upper, so it won't lose the header.
> > > anyway, -cache option solve your original problem.
> > It works, thanks. 
> I hacked the older YUV4MPEG format support into your demuxer, it works
> fine. You can produce samples with XAWTV.
Cool, but there is a slight problem if it try to use it with the old
mjpeg tools:

'Slow source' problem again (as above). The YUV4MPEG header is shorter
than the YUV4MPEG2 header. Only 19 bytes are available (in the beginnig),
the ASF checker wants more, so the header is lost. The Y4M checker should
be moved so that it appears before the asf check. (the AVI check
only takes 8 bytes, so that is okay) (indeed -cache solves
the problem, but it is not the default)

Greetings,

Rik.

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