I’ve noticed some people have stumbled here looking for how to solve Ubuntu video flickering issues. While I still haven’t figured out how to use both outputs of my dualhead ATI card without flicker, I do know how to fix video playback flickering.
I use VLC as my default media player. During an Ubuntu upgrade (I think it was 8.04 to 8.10), video playback in VLC started flickering.
In VLC, go to Tools->Preferences and click the Video button. Change output to X11 video output. This fixed the problem for me. There may be some way to change the output system-wide if you use other players, but I’ve had no reason to do this. Also, I don’t think I’ve had any issues with Internet Flash videos.
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