[vlc] Improving Mac OS X Intel MPEG-2 Performance

[galenz at zinkconsulting.com]

I'm curious if there's any way to improve Intel builds' VLC  
performance. I have some MPEG-2 clips on a particular system where  
it's just marginally too slow... the playback isn't really dropping a  
lot of frames, but it drops just enough to give the motion a little  
lack of fluidity.

I'm already using OpenGL video output. There used to be some way to  
force ffmpeg or libmpeg2 to be the decoder. On PPC, libmpeg2 was the  
clear winner, but I'm wondering if perhaps on x86, ffmpeg might have  
some performance advantages?

I've also wondered about doing a custom build, possibly tweaking a  
few things for this system. A further thought has been to use the  
intel compiler, but I'm not sure the complexity of such an  
undertaking. Though some of the performance increases I've seen can  
be quite nice.

Any thoughts?

-Galen

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