[Bug 708867] New: rtsp: stream does not start with playbin until all rtp sessions got data

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=708867
  GStreamer | gst-plugins-good | 1.2.0

           Summary: rtsp: stream does not start with playbin until all rtp
                    sessions got data
    Classification: Platform
           Product: GStreamer
           Version: 1.2.0
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I'm trying to play a stream from an RTSP server, which has elementary audio and
video on separate rtp channels.

The stream plays fine in all cases when using a static pipeline, like this one:

gst-launch-1.0 rtspsrc location=rtsp://127.0.0.1:53923/211790253373785 name=src
  src. ! rtph264depay ! h264parse ! avdec_h264 ! videoconvert ! xvimagesink
  src. ! rtpmp4gdepay ! aacparse ! avdec_aac ! audioconvert ! pulsesink

However playback does not start until audio is received when using playbin. The
problem is that this stream has sparse audio, sometimes the server does not
stream any audio, while audio is still advertised in the SDP. rtspsrc only
calls gst_element_no_more_pads until all pads are exposed in the rtpmanager
element, which only happens after data has been received on all input pads.
Playbin does not preroll until no_more_pads has been called.

Is there an easy way to fix this ? I've tried calling no_more_pads very early
in rtspsrc but if I do that no video nor audio is played.

Thanks

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