[Bug 780442] New: gtreamer-vaapi render multi video in single pipeline causing videos not killed with vaapisink in wayland

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=780442

            Bug ID: 780442
           Summary: gtreamer-vaapi render multi video in single pipeline
                    causing videos not killed with vaapisink in wayland
    Classification: Platform
           Product: GStreamer
           Version: 1.8.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: siew.hoon.lim at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Gstreamer framework: 1.8.3
Gstreamer vaapi: 1.8 branch
OS: Yocto Linux with wayland weston compositor 
Wayland and weston version: 1.10.0

Able to reproduce the issue with vaapisink (1 video didn't get killed): 
gst-launch-1.0 filesrc location=/Videos/test.mp4 ! qtdemux ! vaapidecode !
vaapisink filesrc location=/Videos/test.mp4 ! qtdemux ! vaapisink

Able to reproduce the issue with vaapisink (2 video didn't get killed): 
gst-launch-1.0 filesrc location=/Videos/test.mp4 ! qtdemux ! vaapidecode !
vaapisink filesrc location=/Videos/test.mp4 ! qtdemux ! vaapisink filesrc
location=/Videos/test.mp4 ! qtdemux ! vaapisink

Not able to reproduce issue if vaapisink replace to waylandsink. 
This issue does not happen in X11 if using vaapisink.

Attached the output_log.txt running with command:
GST_DEBUG=vaapi*:5,GST_REFCOUNTING:7 gst-launch-1.0 -v filesrc
location=/home/root/HoneyBee.mp4 ! qtdemux ! vaapidecode ! vaapisink filesrc
location=/home/root/HoneyBee.mp4 ! qtdemux ! vaapidecode ! vaapisink &>
output_log.txt

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