[MPlayer-dev-eng] [PATCH] vf_ffmpeg, threads and slice callback

[Adrian Stutz]

Hello,

This patch originates from this discussion on mplayer-users:
http://lists.mplayerhq.hu/pipermail/mplayer-users/2009-December/078410.html
http://lists.mplayerhq.hu/pipermail/mplayer-users/2010-January/078845.html

Basically, using a ffmpeg decoder that supports slices with multiple
threads leads to serious video corruption (e.g. when playing DVDs).

I can reproduce the issue with this command line (see the above thread
for more info):
mplayer -lavdopts threads=4 dvd:////path/to/VIDEO_TS

I cherry picked this patch from the fix Utoi applied to his unofficial
git branch.

There's also a much less educated patch from me in this post:
http://lists.mplayerhq.hu/pipermail/mplayer-users/2010-January/078851.html

Is this ok to apply?

Greetings,
Adrian
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