What graphics driver are you using (what video card)? Ist the XVideo extension listed in xdpyinfo?
onboard Intel 810e graphics adaptor. xdpyinfo lists XVideo amongst 27 other extensions
Is it a laptop? I had a problem with my laptop where if the X server was started while I had video output going to an external monitor Xv playback would bluescreen. If I started the X server with video to the builtin LCD it worked fine (even if I later plugged in the external monitor and redirected the video output).
HTH,
-Roberto
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