I'm guessing the user has/had an nvidia graphics card. It sounds like a
known problem with a fairly easy workaround. See the following link:

http://www.nvnews.net/vbulletin/showthread.php?t=131221

In short, the XVideo settings get zeroed. I personally suspect the
culprit is actually nvidia-settings and users perhaps have this run as
part of their login sequence. I only saw the problem after I had run
nvidia-settings (it had been working fine for me before that). The easy
workaround is to start nvidia-settings, go to the "X Server XVideo
Settings" item and you will probably see contrast, hue and saturation
all set to zero. Click on the "Reset Hardware Defaults" button, contrast
and saturation will change to 4096 and your picture will instantly
appear.

HTH.

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mplayer unable to play DV avi files
https://bugs.launchpad.net/bugs/240348
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