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When I try to play MP4 files in mplayer, after a few seconds I get the "Your system is too SLOW to play this!" warning and the video starts lagging behind the audio. It only happens with MP4s, and seems to happen with just about all of them. mplayer doesn't seem to be overtaxing my system, it's just something with playing that particular format. I tried all the mplayer suggestions (different video driver, -framedrop, etc.); the only one that even partially helps is -autosync 30, but that's a hack. What could be wrong? How do I go about debugging/fixing it?

Edit: My video card is an nVidia; I use the official drivers. My available video output drivers according to mplayer are:

    xv  X11/Xv
    gl_nosw OpenGL no software rendering
    x11 X11 ( XImage/Shm )
    xover   General X11 driver for overlay capable video output drivers
    gl  OpenGL
    gl2 X11 (OpenGL) - multiple textures version
    matrixview  MatrixView (OpenGL)
    null    Null video output
    mpegpes MPEG-PES file
    yuv4mpeg    yuv4mpeg output for mjpegtools
    png PNG file
    jpeg    JPEG file

I haven't tried any other players (I don't think I even have any), but I'll try installing another one and see if it has the same problem. I forgot to mention that I have this problem on multiple computers, but they all have essentially the same setup so it's probably a common cause

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Buggy codec? Did you try playing MP4s in another player? Potentially useful info: what video driver(s) (-vo) in mplayer, what video driver(s) in X? –  Gilles Apr 13 '11 at 19:54
Either use the vdpau or use the mplayer argument "framedrop". May be either one of them help you out. –  SHW May 5 '11 at 10:34
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