[Bug 794793] waylandsink: change to use GCond to avoid dropping video buffer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794793

--- Comment #3 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #2)
> Review of attachment 370283 [details] [review]:
> 
> I'm not convinced by this solution, since you might be playing something
> like 60fps over 30fps display. This method will add one vblank latency that
> isn't needed. Also, you have a bug, since you need to unblock on state
> transition to READY and on flush-start event.
> 
> The is a branch that started implementing presentation timestamp support,
> that seems much more robust solution.

Which branch? Could you show me the implementing? We need this solution because
sink will drop frames and video is not smooth.

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