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• FFMPEG - Creating multiple copies of a video with different audio channels. Can't hear channel 4

  13 février 2020, par Gabriel_ris

  I’m working on a project where I need to have 6 copies of a video, where each copy only plays one audio channel.
  The original video has only 2 channel, with the same audio on each channel.
  First I had to copy one of the channels into the other 4 missing channels.
  I’m new to ffmpeg, I did some research and I used this command :

  ffmpeg -i input.mp4 -map_channel 0.1.0 -map_channel 0.1.0 -map_channel
  0.1.0 -map_channel 0.1.0 -map_channel 0.1.0 -map_channel 0.1.0 -c:v copy output.mp4

  That helped to turn the video into a 6 channels one. Then, I revised the command for each channel :

  ffmpeg -i input.mp4 -map_channel 0.1.0 -map_channel -1 -map_channel -1
  -map_channel -1 -map_channel -1 -map_channel -1 -c:v copy output_channel1.mp4

  ffmpeg -i input.mp4 -map_channel -1 -map_channel 0.1.0 -map_channel -1
  -map_channel -1 -map_channel -1 -map_channel -1 -c:v copy output_channel2.mp4

  and so on.

  All the videos worked perfectly on their own channels, but channel 4, in which I can only hear some low noise.
  I read channel 4 is used for low frequency audio in 5.1 configuration, which might be the problem.
  I tried specifying the channel layout to 6.0, increasing the volume, disabling guess_layout_max, but nothing worked.
  As I said, I’m new to ffmpeg, and probably there is a much better way to do it. I’d appreciate if someone here could help me.
  Thanks !

• Pass channel id to ffmpeg

  17 octobre 2016, par snowman

  Is there a way to pass a particular channel id to ffmpeg to control a tuner card ?
  I can run the following and capture my tuner card, but would like to pass a particular channel id.

  ffmpeg -f dshow -show_video_device_dialog true -i video="Hauppauge Cx23100 Video Capture" -r 20 -threads 0 -hls_time 10 -hls_list_size 6 -hls_wrap 10 -start_number 1 TEST.m3u8

• No sound : FFmpeg + ip camera + youtube live

  22 mars 2019, par Vsevolod Trofimov

  I have troubles with live broadcast to Youtube using ip+camera + FFmpeg. Now I use following command :
  ffmpeg  -i rtsp://[source]:554 -c:v copy -c:a aac -f flv rtmp://a.rtmp.youtube.com/live2/[seckey]

  video working, but no sound

  ip camera support alaw and ulaw codecs, i’ve checked with botch of them. when I open rtsp://[source]:554 in vlc - there is video with sound.

  output of FFmpeg :

  ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --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-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Guessed Channel Layout for Input Stream #0.1 : mono
  
  Input #0, rtsp, from 'rtsp://...:554':
  
    Metadata:
  
      title           : RTSP Session/2.0
  
    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], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1: Audio: pcm_mulaw, 16000 Hz, mono, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/...':
  
    Metadata:
  
      title           : RTSP Session/2.0
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: h264 (Main) ([7][0][0][0] / 0x0007), yuvj420p(pc, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 1k tbn, 90k tbc
  
      Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 16000 Hz, mono, fltp, 69 kb/s
  
      Metadata:
  
        encoder         : Lavc57.107.100 aac
  
  [rtsp @ 0x55967aaaa820] max delay reached. need to consume packet
  
  [rtsp @ 0x55967aaaa820] RTP: missed 145 packets
  
  frame=  564 fps= 27 q=-1.0 size=   11305kB time=00:00:22.92 bitrate=4040.4kbits/s speed=1.08x