[Bug 747499] New: gstplaysink: 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

            Bug ID: 747499
           Summary: gstplaysink: set async to false for a customed
                    text-sink will cause sync problem when seeking
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mingke.wang at freescale.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 301119
  --> https://bugzilla.gnome.org/attachment.cgi?id=301119&action=edit
gstplaysink: don't set async of custom text-sink to  false

set async to false for a custom text-sink will lead to sync problem when
seeking.
eg. we use appsink to catch text and use UI to render those text.
if set async to false, after seeking, the text and video are not sync.

I think the preroll need use GAP event instead of setting async to false for
text sink.

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