[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 #2 from Mingke Wang <mingke.wang at freescale.com> ---
in my understanding, the GAP event can be used to solve the sink prerolls
problem.if there is no text, parser should send GAP event to tell sink.
if set async to false. a custom text-sink will cause sync problem after
seeking.
subtitle will come out quickly and earlier than the video after seeking.

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