[FFmpeg-trac] #10040(ffmpeg:new): Unable to enable FEC on libopus

[FFmpeg]

#10040: Unable to enable FEC on libopus
-------------------------------------+-------------------------------------
             Reporter:  Simon        |                     Type:  defect
  Blandford                          |
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
                                     |  master
             Keywords:  libopus fec  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 -fec switch does not work as expected on libopus.

 According to the docs, libopus requires the fec option to enable forward
 error correction.

 https://ffmpeg.org/ffmpeg-codecs.html#libopus-1

 However the error, "Unsupported FEC protocol" is output regardless of what
 I try to set it to.

 How to reproduce:
 {{{
 % ffmpeg -re -f lavfi -i sine=frequency=864 -c:a libopus -fec 1
 -packet_loss 10 -ac 1 -b:a 32k -ar 48000 -f rtp rtp://0.0.0.0:5020
 ffmpeg version N-109079-g3ab11dc5bb-https://www.martin-riedl.de Copyright
 (c) 2000-2022 the FFmpeg developers
   built with gcc 10 (Debian 10.2.1-6)
   configuration: --prefix=/home/ffmpegBuild/out --enable-gpl --pkg-config-
 flags=--static --extra-version='https://www.martin-riedl.de' --enable-gray
 --enable-libxml2 --enable-libfreetype --enable-fontconfig --enable-
 libbluray --enable-libass --enable-libzvbi --enable-libaom --enable-
 libopenh264 --enable-librav1e --enable-libsvtav1 --enable-libvpx --enable-
 libx264 --enable-libx265 --enable-libmp3lame --enable-libopus --enable-
 libvorbis --enable-libtheora
   libavutil      57. 42.100 / 57. 42.100
   libavcodec     59. 52.102 / 59. 52.102
   libavformat    59. 34.101 / 59. 34.101
   libavdevice    59.  8.101 / 59.  8.101
   libavfilter     8. 50.100 /  8. 50.100
   libswscale      6.  8.112 /  6.  8.112
   libswresample   4.  9.100 /  4.  9.100
   libpostproc    56.  7.100 / 56.  7.100
 Input #0, lavfi, from 'sine=frequency=864':
   Duration: N/A, start: 0.000000, bitrate: 705 kb/s
   Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
 [rtp @ 0x559aab9580c0] Unsupported FEC protocol 1
 rtp://0.0.0.0:5020: Input/output error

 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10040>
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