[FFmpeg-trac] #8436(undetermined:new): ffmpeg sets opus audio to stereo in SDP even though it is mono

FFmpeg trac at avcodec.org
Fri Jan 24 12:30:12 EET 2020


#8436: ffmpeg sets opus audio to stereo in SDP even though it is mono
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  rudolfs.bundulis                   |
                 Type:  defect       |                   Status:  new
             Priority:  minor        |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  opus rtsp    |               Blocked By:
  sdp                                |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by rudolfs.bundulis):

 Replying to [comment:5 cehoyos]:
 > Did you see a05f5052fef3b3743fab7846da12861d8a8098ec?
 > Is the comment wrong?

 Thanks for the link, I looked at the commit and then at
 https://tools.ietf.org/html/rfc7587 and yeah under paragraph 7 it has:

 {{{

 The media subtype ("opus") goes in SDP "a=rtpmap" as the encoding
       name.  The RTP clock rate in "a=rtpmap" MUST be 48000, and the
       number of channels MUST be 2.
 }}}

 so the comment is correct, will close the issue.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8436#comment:6>
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