Please add support for the srt protocol (Secure Reliable Transport)

[gargolito]

Overview

FFMpeg has support to fully utilize the SRT protocol

Existing FFmpeg API

libavformat/libsrt.c

Expected PyAV API

Example:

container = av.open(srt://ipaddress:port?mode=caller)

This will currently fail with "unable to open file"

Investigation

Tried to open an srt video stream in caller mode

container = av.open(srt://IPADDRESS:PORT/?mode=caller)

Reproduction

1. Start a listener (this is the server): ffmpeg -hide_banner -loglevel error -re -stream_loop -1 -i SOME_VIDEO_FILE -c copy -map 0 -f mpegts srt://localhost:5765/?mode=listener
2. try to open the stream with python script using pyav as usual

Versions

• OS: ubuntu linux 22.04
• PyAV runtime: 12.3.0

  PyAV v12.3.0
  library configuration: --disable-static --enable-shared --libdir=/tmp/vendor/lib --prefix=/tmp/vendor --disable-alsa --disable-doc --disable-libtheora --disable-mediafoundation --enable-fontconfig --enable-gmp --enable-gnutls --enable-libaom --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libspeex --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxcb --enable-libxml2 --enable-lzma --enable-zlib --enable-version3 --enable-libopenh264 --disable-libx264
  library license: LGPL version 3 or later
  libavcodec     60. 31.102
  libavdevice    60.  3.100
  libavfilter     9. 12.100
  libavformat    60. 16.100
  libavutil      58. 29.100
  libswresample   4. 12.100
  libswscale      7.  5.100

• PyAV build: pip installed, got version

  v12.3.0

• FFmpeg:

  ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100

Additional context

I really just need to be able to open srt streams, so that basic functionality would be enough for me.