[MPlayer-dev-eng] [PATCH] fix 4xm playback (bugzilla 882)

[Roberto Togni]

Hi all,
 this patch fixes the regression to 4xm playback after the latest
changes to ffmpeg.

FFmpeg now passes some data from 4xm lavf demuxer to 4xv lavc video
decoder using codec_tag. Since MPlayer does not always pass codec_tag
unchanged from demuxer to video decoder, the decoding fails even after
fixing the usual codec_id<->fourcc matching.

The patch move the data from codec_tag to extradata in demuxer_lavf,
and then writes it again to codec_tag in vd_ffmpeg.
This should also allow streamcopy to a different container (untested).


A better fix probably would be changing ffmpeg so that
is uses extradata to pass codec version for 4xm. 


For some samples (like aitd-daddy.4xm) there is a big A/V desync (video
too slow) but that issue was already there before the latest ffmpeg
changes to 4xm.


Ciao,
 Roberto

-- 
Better is the enemy of good enough.
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