[MPlayer-dev-eng] [PATCH] using demuxer_switch(-2) to uninit audio/video

[Nico Sabbi]

At the moment demuxer_switch_{audio,video} always passes to the demuxer
*arg=-1 to switch to the next track.
This patch changes a bit the interface, using -2 to mean "no sound", 
consistently
with -novideo and -nosound; it's needed when switching from a program that
doesn't have one stream type (e.g. video)  to another program which has it.
All other demuxers should be unaffected.
If there are no complains I'll commit RSN
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