Hi,
I am trying to create an RTP with FEC output from ffmpeg and receive the error 
“Unrecognized option ‘fec’” when running this incantation:

ffmpeg -re -i filename.ts -c copy -map 0 -fec prompeg=l=5:d=20 rtp://<IP>:5000

Is prompeg supposed to be in the distribution?  If so, how to enable support 
for FEC? If not, do I need to recompile and which libs to enable?
Thanks,
Steve


fmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg 
developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 
--build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu 
--incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl 
--enable-shared --disable-stripping --disable-decoder=libopenjpeg 
--disable-decoder=libschroedinger --enable-avresample --enable-avisynth 
--enable-gnutls --enable-ladspa --enable-libass --enable-libbluray 
--enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite 
--enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme 
--enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg 
--enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger 
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex 
--enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis 
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 
--enable-libxvid --enable-libzvbi --enable-openal --enable-opengl 
--enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq 
--enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
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outfile}...

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