[Bug 741398] New: version check failed (0 != 2) causes rtpptdemux to fail

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741398
  GStreamer | gst-plugins-base | 1.1.4

           Summary: version check failed (0 != 2) causes rtpptdemux to
                    fail
    Classification: Platform
           Product: GStreamer
           Version: 1.1.4
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: wigert at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


If the first packet received by rtpptdemux is "Unknown RTP version 0" (linphone
does this), a series of errors occur:

version check failed (0 != 2)
- gstrtpbuffer.c:442

Could not decode stream.
Dropping invalid RTP payload
- gstrtpptdemux.c:454

Internal data flow error.
- gstbasesrc.c:2855

streaming task paused, reason error (-5)


Linphone used:
Built from latest as of 11 dec 2014.
Calling with PCMA and Telephone-Event.

Pipeline used:
udpsrc -> rtpptdemux -> capsfilter -> rtpbin -> valve -> rtppcmadepay ->
alawdec -> wavenc -> filesink
                    \-> capsfilter          \-> rtpdtmfdepay -> fakesink

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