[Bug 709800] New: [gstrtpjitterbuffer] stalled stream after gst_rtp_jitter_buffer_clear_pt_map() being called.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=709800
  GStreamer | gst-plugins-good | 1.2.0

           Summary: [gstrtpjitterbuffer] stalled stream after
                    gst_rtp_jitter_buffer_clear_pt_map() being called.
    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: fabrice at bellet.info
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Hi!

In empathy on Fedora-20, I start an audio connection (xmpp) with a peer, and I
enable the video a few seconds later. When the video is enabled, the audio
stops being received (both peer are symetric in my testcase : same Fedora
version)

I debugged the problem up to gst_rtp_jitter_buffer_clear_pt_map() being called
when the new streams are enabled. This causes next_seqnum to be reset to value
-1, and this value is never modified again, causing packets to accumulate in
handle_next_buffer().

Full debug logs are here : http://bellet.info/gstreamer
(the pipeline is also provided when audio only is used, and after video is
enabled)

The problem begins at timeframe 0:00:19.766628529:

0:00:19.766628529 10530      0x1a24890 DEBUG        rtpjitterbuffer
gstrtpjitterbuffer.c:903:gst_rtp_jitter_buffer_clear_pt_map:<rtpjitterbuffer0>
reset jitterbuffer

The value of next_seqnum is not updated in gst_jitter_buffer_sink_parse_caps(),
at timeframe 0:00:19.808406390, because the value for seqnum-base is not
defined in the caps_struct. And the rtpjitterbuffer remains stalled with buffer
#25995:

0:00:19.808975837 10530      0x2250630 DEBUG        rtpjitterbuffer
gstrtpjitterbuffer.c:2372:handle_next_buffer:<rtpjitterbuffer0> First buffer
#25995
0:00:19.809187602 10530      0x2250630 DEBUG        rtpjitterbuffer
gstrtpjitterbuffer.c:2372:handle_next_buffer:<rtpjitterbuffer0> First buffer
#25995
0:00:19.809403417 10530      0x2250630 DEBUG        rtpjitterbuffer
gstrtpjitterbuffer.c:2372:handle_next_buffer:<rtpjitterbuffer0> First buffer
#25995


A naive fix, that seems to work for me consists in also setting next_in_seqnum
to value -1 in gst_rtp_jitter_buffer_clear_pt_map().

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