I'm having trouble with MPlayer, which I've just installed. I can't get the video to play full screen. That is to say, when I'm using the X11 driver, the video window does not resize when I select full screen playback - it continues to play at its original size in a black window. If I select gl or gl2 then the sound badly lags the video, before the video seizes up and refuses to play any further.
I'm using a fairly powerful machine so I don't think that the hardware should be a problem. At least, when i used to play videos in windows I never had any problems, so i think I should be OK