[Bug 787290] omxvideodec: Stuck after several seeks on Raspberry Pi3

[GStreamer (GNOME Bugzilla)]

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

--- Comment #10 from Yuji Kuwabara <HHG01200 at nifty.ne.jp> ---
Thanks for comments.

--------------------------------
This is not correct, the FLUSH_START event need to be propagated before you can
take the stream lock. That's why the base class will call flush on FLUSH_STOP
event, which hold the stream-lock.
--------------------------------

In my modification, GST_EVENT_FLUSH_START event is propagated before LOCK and
FLUSH. 
Similar pattern is seen in gst_rtp_rtx_send_sink_event().
---------------------------------
    case GST_EVENT_FLUSH_START:
      gst_pad_push_event (rtx->srcpad, event);
      gst_rtp_rtx_send_set_flushing (rtx, TRUE);
      gst_pad_pause_task (rtx->srcpad);
      return TRUE;
---------------------------------
LOCK is used in gst_rtp_rtx_send_set_flushing()

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