Originally Posted by AaronP
Also, make sure that you disable XV sync-to-vblank in nvidia-settings if you're using a compositor. This option syncs rendering of the video into the offscreen pixmap, which isn't what you want. You want to sync the compositor's rendering to the screen.
There are 3 Sync To Vblank options, 2 xvideo (video texture and video blitter) and opengl. So the two xvideo ones should be disabled, right?