[Bug 792403] New: compositor not producing buffers unless a buffer has been received despite start-time-selection=zero

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792403

            Bug ID: 792403
           Summary: compositor not producing buffers unless a buffer has
                    been received despite start-time-selection=zero
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I'm trying to feed compositor with data from udpsrc; i am expecting compositor
to start producing buffers from 0 (since start-time-selection is set to zero),
but it doesn't.

GST_DEBUG=agg*:6 gst-launch-1.0 compositor name=comp ! timeoverlay !
xvimagesink udpsrc port=1234 ! "application/x-rtp, media=(string)video,
clock-rate=(int)90000, encoding-name=(string)RAW, sampling=(string)YCbCr-4:2:0,
depth=(string)8, width=(string)320, height=(string)240,
colorimetry=(string)BT601-5, payload=(int)96, ssrc=(uint)2807559578,
timestamp-offset=(uint)1965208493, seqnum-offset=(uint)21164" ! rtpvrawdepay !
videorate ! queue ! comp. 

The display sink will only display something whenever some data is coming in
with e.g.

gst-launch-1.0 videotestsrc is-live=true pattern=18 ! rtpvrawpay ! udpsink
host=127.0.0.1 port=1234

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