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However I still can tell you I can't play a 1080p video with a q9300 and opengl acceleration, while with xv it's ok. (but there is tearing)
OpenGL will always have higher overhead than Xv for video playback; the GL output is just a useful short-term solution.
On the good news front, it looks like there is progress in standardizing sync-to-vblank in the framework; in this case in DRI2. Scroll down to "painflipping" :
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