[mythtv] [PATCH] Multithreaded libavcodec/MPEG4 encoding

[Debabrata Banerjee]

---- This is not for 0.15 release ---

This enables the use of more than one thread to encode MPEG4, configurable
through the recording profiles. I am probably getting close to double
encoding
capacity with it on my SMP machine. It should help a bit for HT as well.
However when using many threads it magnifies a small memory leak in
libavcodec, but most people will not want to use more than 2. By default it
comes set to one thread, which should be no different than normal.

I also needed to patch libavcodec's pthread.c, which had some bugs which
caused memory and thread freeing problems (not a problem in ffmpeg since
it's one shot). I'll be submitting these changes to the ffmpeg project.

Thanks,
Debabrata



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