[Bug 787466] New: glimagesink: release buffers on GST_EVENT_FLUSH_START

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787466

            Bug ID: 787466
           Summary: glimagesink: release buffers on GST_EVENT_FLUSH_START
    Classification: Platform
           Product: GStreamer
           Version: 1.12.2
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: HHG01200 at nifty.ne.jp
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 359427
  --> https://bugzilla.gnome.org/attachment.cgi?id=359427&action=edit
Patch proposal

According to GStreamer design documentation : Events,
elements are expected to discard buffers on GST_EVENT_FLUSH_START.
This helps upstream elements unblocked.
Do almost same as GST_STATE_CHANGE_PAUSED_TO_READY.

https://bugzilla.gnome.org/show_bug.cgi?id=787290


Note that "enable-last-sample" may be needed to be set to FALSE.

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