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• avformat/mov : read PCM audio configuration box ('pcmC') if available

  7 juin 2022, par Ivan Baykalov

  avformat/mov : read PCM audio configuration box ('pcmC') if available
  For ipcm and fpcm streams, big-endian format is the default, but it can be changed
  
  with additional 'pcmC' sub-atom of audio sample description.
  Details can be found in ISO/IEC 23003-5:2020
  Fixes ticket #9763.
  
  Fixes ticket #9790.
  Patch simplified by Marton Balint.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/mov.c

• avformat/mxfenc : Write Mastering Display Colour Volume to MXF

  9 septembre 2020, par Harry Mallon

  avformat/mxfenc : Write Mastering Display Colour Volume to MXF
  Described in Annex B SMPTE ST 2067-21:2020
  Signed-off-by : Harry Mallon <harry.mallon@codex.online>
  

  • [DH] libavformat/mxfenc.c

• Using ffmpeg to convert the audio of an RTSP stream to PCM alaw and hosting an RTSP stream as the output

  24 octobre 2020, par Sirisian

  I have an RTSP stream on my network that is H264 for video and aac for audio. I need the audio converted to PCM alaw with the video just passed through.

  


  I tried :

  


  ffmpeg -rtsp_transport udp -i rtsp://10.0.0.10/main -vcodec copy -acodec pcm_alaw -rtsp_flags listen -f rtsp rtsp://localhost:8001/main


  


  The output I get is :

  


  ffmpeg version 4.3.1-2020-10-01-essentials_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[rtsp @ 0000025ebdf1db00] Interleaved RTP mode is not supported yet.
Input #0, rtsp, from 'rtsp://10.0.0.10/main':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc
    Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (aac (native) -> pcm_alaw (native))
Press [q] to stop, [?] for help


  


  It's running, but it's not listening on port 8001. I've tried both UDP and TCP, so I think I am misunderstanding what "-rtsp_flags listen" does for ffmpeg ? My goal is to start an "RTSP server" locally and allow say VLC or any other player to connect and play it. Is this something ffmpeg can do or do I need to send the stream to something else to allow VLC or other media players to connect to it locally ? (The hardware I'm running isn't terribly fast, so I'd like to do this with the least amount of operations possible).

  


  For reference if I run :

  


  ffplay -rtsp_flags listen rtsp://localhost:8001/main


  


  Then run :

  


  ffmpeg -rtsp_transport udp -i rtsp://10.0.0.10/main -vcodec copy -acodec pcm_alaw -f rtsp rtsp://localhost:8001/main


  


  It plays fine in the ffplay application. So it's like the "-rtsp_flags listen" only works with the input portion of ffplay and ffmpeg.