https://bugs.freedesktop.org/show_bug.cgi?id=76564
--- Comment #40 from Rainer Hochecker fernetmenta@online.de --- If you set "sync playback to display" in XBMC, an inaccurate clock has no impact on dropped or skipped frames. Suppose you only have a 24Hz mode and play material which is 23.976. It would slightly speed up playback: every vblank interval a frame is rendered. If you observe skipped frames, the render thread may have been blocked too long or a vertical retrace was missed.