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• Stream multiple docker container audio

  18 août 2021, par Sina Zand Karimi

  I want to run multiple docker containers on a machine and stream the audio via RTP. I can run apps with sound with this command :

  


  sudo docker run -it \
    --device /dev/snd \
    -e PULSE_SERVER=unix:${XDG_RUNTIME_DIR}/pulse/native \
    -v ${XDG_RUNTIME_DIR}/pulse/native:${XDG_RUNTIME_DIR}/pulse/native \
    -v ~/.config/pulse/cookie:/root/.config/pulse/cookie \
    --group-add $(getent group audio | cut -d: -f3) \
    
    ubuntu:16.04 /bin/bash


  


  It works fine and when i play any sound in the container it plays and i can hear it and i can stream it with FFmpeg. The problem is when i run multiple containers and play any sound from any container, it seems they are using the same sink in pulseaudio server so i can't separate them and each stream client hear all the sounds from all the running containers. How can i achieve my goal ?
My FFmpeg Stream code :

  


  ffmpeg -f alsa -i pulse -acodec libmp3lame -ab 128k -ac 2 -ar 48000 -c:a libopus -f rtp rtp://$IP:4001


  


• How can I setup PIDs using ffmpeg & MP4 Container ?

  11 août 2021, par Manoel Rocha

  Is there anyone who could help me with a simple hint regarding MP4 container ?

  


  Basically I got all the results I need, I just need a help to understand how to define PIDs (or component IDs) for each track inside the container.

  


  The command I'm using :

  


  ffmpeg -i source.mov -c:v libx264 -preset veryfast -b:v 20000K -minrate 20000K -maxrate 20000K -bufsize 40000K -bf 2 -qcomp 0.0 -keyint_min 25  -g 15 -pix_fmt yuv420p -color_trc bt709 -color_primaries bt709 -r 30000/1001 -profile:v high -level 4.1 -bsf:v 'filter_units=remove_types=6' -movflags faststart -metadata:s:v:0 language=eng -metadata:s:v:0 title="Video" -filter_complex "[0] scale=1920:1080" -filter_complex "[0:3][0:1][0:2][0:4][0:5][0:6]join=inputs=6:channel_layout=5.1,loudnorm=I=-23:TP=-1.0:LRA=20" -filter_complex "[0:9][0:7][0:8][0:10][0:11][0:12]join=inputs=6:channel_layout=5.1,loudnorm=I=-23:TP=-1.0:LRA=20" -c:a ac3 -b:a:0 448k -b:a:1 448k -metadata:s:a:0 language=eng -metadata:s:a:0 title="AC-3 5.1" -metadata:s:a:1 language=por -metadata:s:a:1 title="AC-3 5.1" -streamid 0:0x01E1 -streamid 1:0x01E2 -streamid 2:0x01E3 -f mp4 output.mp4


  


  My output file is a MP4 but tracks IDs are 1 (video), 2 (1st audio), 3 (2nd audio).

  


  How can I change these IDs to 101, 201 and 202 ?

  


  Many thanks for your time !

  


• FFMPEG wrapping live h264 to mp4 container delay

  3 août 2021, par Emil Borconi

  Sorry if this has been asked but I couldn't find the answer.

  


  I'm trying to wrap a live raw h264 stream to a fragmented MP4 container. This is working as expected, with one issue, I have a 5-10 seconds delay between the input and output. Basically the output start after 5-10 seconds of the first input received.

  


  This is my command :

  


  ffmpeg -r 30 -f h264 -i tcp://127.0.0.1:1234 -c:v copy -an -f mp4 -movflags separate_moof+empty_moov+default_base_moof -tune zerolatency -tcp_nodelay true -frag_duration 33000 -max_muxing_queue_size 1 tcp://127.0.0.1:1235


  


  I have played with fflags, with analyzeduration and with everything I could find in the documentation but no joy.

  


  The input stream is receiving NALU units and I can see that it receives a significant amount of units before it actually starts outputting. Once it starts it works perfect, but the output video is always 5-10 seconds behind the input one.

  


  After a bunch of NALU units received I see ffmpeg outputting the following :

  


  2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: Input #0, h264, from 'tcp://127.0.0.1:8105':
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit:   Duration: 
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: N/A
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: , bitrate: 
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: N/A
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit:   Stream #0:0
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: : Video: h264, yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1280x720
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: , 
2021-08-02 23:46:22.072 24626-11173/app.example.com I/ffmpeg-kit: 30 fps, 
2021-08-02 23:46:22.072 24626-11173/app.example.com I/ffmpeg-kit: 30 tbr, 
2021-08-02 23:46:22.072 24626-11173/app.example.com I/ffmpeg-kit: 1200k tbn, 
2021-08-02 23:46:22.072 24626-11173/app.example.com I/ffmpeg-kit: 60 tbc
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit: Output #0, mp4, to 'tcp://127.0.0.1:8104':
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit:   Metadata:
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit:     encoder         : 
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit: Lavf58.67.100
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit:   Stream #0:0
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit: : Video: h264 (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1280x720, q=2-31
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: , 
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: 30 fps, 
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: 30 tbr, 
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: 15360 tbn, 
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: 30 tbc
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: Stream mapping:
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit:   Stream #0:0 -> #0:0
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit:  (copy)
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: Press [q] to stop, [?] for help


  


  That is an Android wrapper, but same thing happen if I run the command on my laptop from the command line.

  


  What am I'm missing, I need this to be real-time / instant muxing...

  


  Thanks for the help.