[Bug 726579] New: Receiving opus audio over RTP sometimes include static in the right channel

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726579
  GStreamer | gst-plugins-bad | 1.x

           Summary: Receiving opus audio over RTP sometimes include static
                    in the right channel
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: marcin at saepia.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=272206)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=272206)
Dump of receiver pipeline

In 1.2.3 I randomly get a static in the right channel of audio received via RTP
if it's encoded as opus. I was not able to find a pattern, but I have never
reproduced this using e.g. vorbis so I guess it is related to opus codec.

Please see attached pipeline and sample recordings.

For streaming I use avconv although I was able to reproduce this by using
gst-launch as a sender.

Sender command:

$ avconv -f pulse -i default -acodec libopus -ab 128k -f rtp
rtp://localhost:10000
avconv version 9.11-6:9.11-2ubuntu1, Copyright (c) 2000-2013 the Libav
developers
  built on Mar  2 2014 20:32:58 with gcc 4.8 (Ubuntu 4.8.2-16ubuntu4)
[pulse @ 0xcf5100] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, pulse, from 'default':
  Duration: N/A, start: 0.005766, bitrate: N/A
    Stream #0.0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Output #0, rtp, to 'rtp://localhost:10000':
  Metadata:
    encoder         : Lavf54.20.3
    Stream #0.0: Audio: libopus, 48000 Hz, stereo, s16, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le -> libopus)
SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 54.20.3
m=audio 10000 RTP/AVP 97
b=AS:128
a=rtpmap:97 opus/48000

Press ctrl-c to stop encoding
^Csize=    1446kB time=112.17 bitrate= 105.6kbits/s

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