On Thu, 2010-03-25 at 10:13 -0400, TJ wrote: > When playing HD files encoded with h.264, video progressively goes out of sync > with (lags behind) the audio. I tried it on 2 different computers. Here are the > commands I used: > I am using MPlayer SVN-r29796-4.3.4. > I was thinking maybe this has something to do with the monitor refresh rate > being 60Hz while the video is 59.94Hz. Yes this problem is most likely related to the frame rates. It's a limitation of the VDPAU driver (also shared by some other video outputs) in MPlayer svn. Try compiling a player from git://repo.or.cz/mplayer-build.git That has superior VDPAU support and should avoid this problem. (Depending on your linux distro there may be precompiled packages available in case you don't want to compile yourself.)