[Bug 686547] New: rtpopuspay outputs unparseable caps

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=686547
  GStreamer | gst-plugins-bad | 0.10.23

           Summary: rtpopuspay outputs unparseable caps
    Classification: Platform
           Product: GStreamer
           Version: 0.10.23
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: james at talkunafraid.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Tested on Raspbian (effectively Debian packages, armhf architecture), PyGST w/
0.10.23.


rtpopuspay yields the following caps: application/x-rtp, media=(string)audio,
clock-rate=(int)48000, encoding-name=(string)X-GST-OPUS-DRAFT-SPITTKA-00,
caps=(string)"audio/x-opus, multistream=(boolean)false, streamheader=(buffer)<
4f707573486561640102000080bb0000000000,
4f707573546167731e000000456e636f6465642077697468204753747265616d6572204f707573656e630000000001
>", ssrc=(uint)1840561209, payload=(int)96, clock-base=(uint)2761078862,
seqnum-base=(uint)617

Upon trying to set up on the receiver by setting caps on the udpsrc, the
following warnings and critical assertion failure pop up:

0:00:00.491406610  6606  0x2421a20 WARN                 default
gststructure.c:2112:gst_structure_parse_field: failed to parse value
caps=(string)"audio/x-opus, multistream=(boolean)false, streamheader=(buffer)<
4f707573486561640102000080bb0000000000,
4f707573546167731e000000456e636f6465642077697468204753747265616d6572204f707573656e630000000001
>", ssrc=(uint)1840561209, payload=(int)96, clock-base=(uint)2761078862,
seqnum-base=(uint)617
0:00:00.492531625  6606  0x2421a20 WARN                 default
gststructure.c:2293:gst_structure_from_string: Failed to parse field,
r=caps=(string)"audio/x-opus, multistream=(boolean)false,
streamheader=(buffer)< 4f707573486561640102000080bb0000000000,
4f707573546167731e000000456e636f6465642077697468204753747265616d6572204f707573656e630000000001
>", ssrc=(uint)1840561209, payload=(int)96, clock-base=(uint)2761078862,
seqnum-base=(uint)617

(python:6606): GStreamer-CRITICAL **: gst_pad_set_caps: assertion `caps == NULL
|| gst_caps_is_fixed (caps)' failed
/GstPipeline:rx/GstUDPSrc:udpsrc0.GstPad:src (gst.Pad)
ANY


I'm guessing this is choking on the caps within caps thing which is not
standard for GStreamer.

Is this workaroundable (drop inner caps/pass them elsewhere) or is this a bug
within the caps parsing code that requires fixing?

This effectively renders 0.10.23 unusable for RTP transit of Opus unless I'm
being an idiot and missing something.

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