[vlc-devel] Another stutter issue

[Rémi Denis-Courmont]

Le samedi 5 mars 2011 19:11:59 Juha Jeronen, vous avez écrit :
> a) Maybe the processing chain is not aligned to vsync? Framerate doubler
> = 60Hz, LCD display, also 60Hz. There should be exactly one output frame
> rendered at each vsync, and there is no room for any misses. This may
> set limits on acceptable times when the decoding of the next frame
> should begin (so that all output frames can be rendered in time for the
> next vsync).

I believe we cannot synchronize with the vertical refresh using plain X11. 
This issue is quite evident when resizing a video.

With XVideo, the driver will do it automatically... or not. You can check with 
'xvinfo' if XV_SYNC_TO_VBLANK is set to 1 (good), 0 (bad) or missing (probably 
bad).

With OpenGL, I think we have to do it by hand from the video output plugin, 
and I'm not sure we actually do.

-- 
Rémi Denis-Courmont
http://www.remlab.info/
http://fi.linkedin.com/in/remidenis