[Bug 747499] playsink: set async to false for a customed text-sink will cause sync problem when seeking

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747499

--- Comment #4 from Mingke Wang <mingke.wang at freescale.com> ---
in my case, I use app-sink to get the subtitle text and text was rendered by
UI. I didn't perform sync in UI, that means the sync will reply on app-sink,
once app-sink sent me a text, UI will renders it immediately. 
I found that if async=false, then after seeking, app-sink will get subtitle
text earlier than video.

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