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I just installed 11.10 and I also installed the ATI prop. driver. Whenever I try to play a mkv file in mplayer, smplayer, or vlc, it is choppy. And in the case of VLC the audio is messed up also. Any way to fix this?

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Try to see if my answer works for you.… – Celso Jan 17 '12 at 10:38
Which driver are you using for ATI? – shantanu Jan 22 '12 at 13:31

You could try installing the driver from the ati website (if you haven't done so already). Follow these instructions:

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You need to install xvba-va driver and then enable GPU acceleration in VLC codecs.

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