[Bug 753850] New: playsink: overlay composition negotation with the sink fails

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753850

            Bug ID: 753850
           Summary: playsink: overlay composition negotation with the sink
                    fails
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: rawoul at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The overlay composition with the sink fails in textoverlay when using playsink.
When using the sink directly the query allocation is successful. For comparison
here are both pipelines:

GST_DEBUG='pango:5' ~/Work/gst/bin/gst-launch-1.0 videotestsrc ! queue !
t.video_sink http://absolut.zogzog.org/goinfre/share/samples/srt/tags.srt !
queue ! subparse ! t.text_sink textoverlay name=t ! glimagesink 2>&1 | grep
'sink alloc'

prints "sink alloc has overlay meta 1"

GST_DEBUG='pango:5' ~/Work/gst/bin/gst-launch-1.0 videotestsrc ! queue !
t.video_raw_sink http://absolut.zogzog.org/goinfre/share/samples/srt/tags.srt !
subparse ! queue ! t.text_sink playsink name=t flags=0x5 2>&1 | grep 'sink
alloc'

prints "sink alloc has overlay meta 0"

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