[mythtv-users] Sync to VBlank & non 60hz framerate

Mark Buechler mark.buechler at gmail.com
Thu Sep 27 17:22:02 UTC 2007

I have a question regarding people's experience with using
XVideoTextureSyncToVBlank, XVideoBlitterSyncToVBlank or SyncToVBlank. I have
an nvidia 8500 so I use XVideoTextureSyncToVBlank=1. For all 30fps
(specifically 29.94) video, this works very well. Without it I get tearing.
I am using OpenGL VSync:

2007-09-27 08:00:04.790 OpenGLVideoSync()
2007-09-27 08:00:04.793 OpenGLVideoSync: x,y -> 959, 540
2007-09-27 08:00:04.810 Using OpenGLVideoSync

However, often times with streams playing at near 60fps (ie: 59.88), I get
quite a lot of stuttering and "video behind audio" messages from myth. My
modeline is 1080i at 59.9hz:

"1080i-spec" 74.175824 1920 1960 2008 2200 1080 1084 1094 1125 interlace
-hsync -vsync

Note, I also use ExactModeTimingsDVI=true in my configuration. If I set
XVideoTextureSyncToVBlank to 0 then playback is flawless. Has anyone else
run into this issue and found a solution? Should I be using a better

Thanks, Mark.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mythtv.org/pipermail/mythtv-users/attachments/20070927/9777bd05/attachment.htm 

More information about the mythtv-users mailing list