How To Reduce/Eliminate Horizontal Tearing

Nick Nobody me at
Wed Dec 10 21:55:40 PST 2008

On Thu, December 11, 2008 00:31, Nikos Chantziaras wrote:
> Keith Packard wrote:
>> On Wed, 2008-12-10 at 23:14 -0500, Nick Nobody wrote:
>>> Hello,
>>> I'm using Ubuntu 8.10 with a GM945 (at 1920x1080) for my media center
>>> PC.
>>> The problem I'm running into is a bunch of horizontal tearing on higher
>>> resolution videos (720p or greater). From what I can tell it's not a
>>> CPU
>>> limitation but rather something related to the graphics card...
>>> Are there any options that I can enable in my xorg.conf to help
>>> reduce/eliminate this tearing? Or is this simply a hardware limitation?
>>> Can XvMC somehow help me here?
>> There aren't any options at this point, but I'm wondering -- is this
>> full-screen? If we made full-screen Xv operations block until vblank
>> (which would lock up the X server), would that be an acceptable option?
>> It's actually very easy to do, just stick a 'wait for vblank' command
>> into the ring right before the 'copy the new picture' command in the Xv
>> extension code. It's just annoying when you're watching a tiny movie and
>> your whole session stops responding.
> That would be just a temporary solution with too many problems (since I
> assume a real solution will be in DRI2?)  The OpenGL method with VSync
> works quite well.

Can you recommend a media player that is able to use OpenGL? I've tried
mplayer but even on a relatively fast cpu it can't playback the video fast
enough (720p content). Unless I'm missing some magic switch that's buried
deep within the man page :)


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