[Bug 27192] bad double buffering or vertical sync

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=27192





--- Comment #8 from Alex Deucher <agd5f at yahoo.com>  2010-03-19 12:00:05 PST ---
(In reply to comment #7)
> Created an attachment (id=34248)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=34248) [details]
> simulation
> 
> An screenchot does not reproduce the problem I am seeing because it mixes a lot
> of video frames (and not just two) in the resulting image.
> 
> I have made up a picture showing the effect. The border between the frames is
> not static but changes randomly and is usually placed at the top, between the
> 10% and 30% of the screen.

Looks like tearing.  Make sure the Xv attribute XV_VSYNC is set to 1 (check
with xvinfo or xvattr) and your video app is using Xv.  You might also try
disabling XV_BICUBIC (use xvattr).


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