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• Running pulseaudio inside docker container to record system audio

  20 mars 2023, par XXLuigiMario

  I'm trying to set up a Docker container with Selenium that takes a recording of the browser with system audio using ffmpeg. I've got video working using Xvfb. Unfortunately, on the audio side, it seems to be more tricky.

  


  I thought I would set up a virtual pulseaudio sink inside the container, which would allow me to record its monitor :

  


  pacmd load-module module-null-sink sink_name=loopback
pacmd set-default-sink loopback
ffmpeg -f pulse -i loopback.monitor test.wav


  


  This works on my host operating system, but when trying to start the pulseaudio daemon in a container, it fails with the following message :

  


  E: [pulseaudio] module-console-kit.c: Unable to contact D-Bus system bus: org.freedesktop.DBus.Error.FileNotFound: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory


  


  This would seem to be related to a freedesktop service called dbus. I've tried installing it and starting its daemon, but I couldn't seem to get it to work properly.
I couldn't find much information on how to proceed from here. What am I missing for pulseaudio ? Perhaps there's an easier way to record the system audio inside a container ?

  


  My goal is not to record it from the host operating system, but to play the audio inside the browser and record it all inside the same container.

  


• Muxing raw h264 + aac into mp4 file with av_interleaved_write_frame() returning 0 but the video is not playable

  3 avril 2020, par Jaw109

  I have a program [1] that muxing audio and video into mp4 file(in idividual worker thread, retrieving audio/video frame from a streaming daemon). The audio is perfectly played in VLC, but the video is not playable, VLC debug logs show the start-code of video frame is not found.

  



  I have another demuxing program [2] to retrieve all the frame to see what had happened. I found the video frame is modified

  



  00000001 674D0029... was modified into 00000019 674D0029... (framesize is 29)
00000001 68EE3C80... was modified into 00000004 68EE3C80... (framesize is 8)
00000001 65888010... was modified into 0002D56F 65888010... (framesize is 185715)
00000001 619A0101... was modified into 00003E1E 619A0101... (framesize is 15906)
00000001 619A0202... was modified into 00003E3C 619A0202... (framesize is 15936)
00000001 619A0303... was modified into 00003E1E 619A0303... (framesize is 15581)


  



  It seems like the h264 start-code was replaced with something like... frame-size. but why ? Is there anything I did wrongly ? (Any idea ? something flags ? AVPacket initialization ? AVPacket's data copy wrongly ?)

  



  [1] muxing program

  



  int go_on = 1;
std::mutex g_mutex;
AVStream* g_AudioStream = NULL;
AVStream* g_VideoStream = NULL;

int polling_ringbuffer(int stream_type);

int main(int argc, char** argv)
{

  AVFormatContext* pFmtCntx = avformat_alloc_context();
  avio_open(&pFmtCntx->pb, argv[1], AVIO_FLAG_WRITE);
  pFmtCntx->oformat = av_guess_format(NULL, argv[1], NULL);
  g_AudioStream = avformat_new_stream( pFmtCntx, NULL );
  g_VideoStream = avformat_new_stream( pFmtCntx, NULL );
  initAudioStream(g_AudioStream->codecpar);
  initVideoStream(g_VideoStream->codecpar);
  avformat_write_header(pFmtCntx, NULL);

  std::thread audio(polling_ringbuffer, AUDIO_RINGBUFFER);
  std::thread video(polling_ringbuffer, VIDEO_RINGBUFFER);

  audio.join();
  video.join();

  av_write_trailer(pFmtCntx);
  if ( pFmtCntx->oformat && !( pFmtCntx->oformat->flags & AVFMT_NOFILE ) && pFmtCntx->pb )
    avio_close( pFmtCntx->pb );
  avformat_free_context( g_FmtCntx );

  return 0;
}

int polling_ringbuffer(int stream_type)
{
  uint8_t* data = new uint8_t[1024*1024];
  int64_t timestamp = 0;
  int data_len = 0;
  while(go_on)
  {
    const std::lock_guard lock(g_mutex);
    data_len = ReadRingbuffer(stream_type, data, 1024*1024, &timestamp);

    AVPacket pkt = {0};
    av_init_packet(&pkt);
    pkt.data = data;
    pkt.size = data_len;

    static AVRational r = {1,1000};
    switch(stream_type)
    {
      case STREAMTYPE_AUDIO:
        pkt.stream_index = g_AudioStream->index;
        pkt.flags = 0;
        pkt.pts = av_rescale_q(timestamp, r, g_AudioStream->time_base);
        break;
      case STREAMTYPE_VIDEO:
        pkt.stream_index = g_VIDEOStream->index;
        pkt.flags = isKeyFrame(data, data_len)?AV_PKT_FLAG_KEY:0;
        pkt.pts = av_rescale_q(timestamp, r, g_VideoStream->time_base);
        break;
    }
    static int64_t lastPTS = 0;
    pkt.dts = pkt.pts;
    pkt.duration = (lastPTS==0)? 0 : (pkt.pts-lastPTS);
    lastPTS = pkt.pts;

    int ret = av_interleaved_write_frame(g_FmtCntx, &pkt);
    if(0!=ret)
      printf("[%s:%d] av_interleaved_write_frame():%d\n", __FILE__, __LINE__, ret);
  }

  return 0;
}


  



  [2] demuxing program

  



  int main(int argc, char** argv)
{
  AVFormatContext* pFormatCtx = avformat_alloc_context();
  AVPacket pkt;
  av_init_packet(&pkt);
  avformat_open_input(&pFormatCtx, argv[1], NULL, NULL);
  for(;;)
  {
    if (av_read_frame(pFormatCtx, &pkt) >= 0)
    {
      printf("[%d] %s (len:%d)\n", pkt.stream_index, BinToHex(pkt.data, MIN(64, pkt.size)), pkt.size );
    }
    else
      break;
  }

  avformat_close_input(&pFormatCtx);
  return 0;
}


  



  [3] Here are my environment

  



  Linux MY-RASP-4 4.14.98 #1 SMP Mon Jun 24 12:34:42 UTC 2019 armv7l GNU/Linux
ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 8.2.0 (GCC)

libavutil      56. 22.100 / 56. 22.100
libavcodec     58. 35.100 / 58. 35.100
libavformat    58. 20.100 / 58. 20.100
libavdevice    58.  5.100 / 58.  5.100
libavfilter     7. 40.101 /  7. 40.101
libswscale      5.  3.100 /  5.  3.100
libswresample   3.  3.100 /  3.  3.100
libpostproc    55.  3.100 / 55.  3.100


  


• dockerfile apt-get install ffmpeg unmet dependencies

  8 juillet 2020, par Martin

  I have a Dockerfile which looks like this :

  


  FROM node:carbon
VOLUME ["/root"]
ADD setup-ffmpeg.sh /root
RUN /root/setup-ffmpeg.sh
# Create app directory
WORKDIR /usr/src/app
# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./
RUN npm install
# If you are building your code for production
# RUN npm install --only=production
# Bundle app source
COPY . .
EXPOSE 8080
CMD [ "npm", "start" ]


  


  Which tries to run the file setup-ffmpeg.sh :

  


  #!/usr/bin/env bash
echo 'deb http://www.deb-multimedia.org jessie main non-free' >> /etc/apt/sources.list
echo 'deb-src http://www.deb-multimedia.org jessie main non-free' >> /etc/apt/sources.list
apt-get update
apt-get install -y --force-yes deb-multimedia-keyring
apt-get remove -y --force-yes ffmpeg
apt-get install -y --force-yes build-essential libmp3lame-dev libvorbis-dev libtheora-dev     libspeex-dev yasm pkg-config libfaac-dev libx264-dev libav-tools 
echo "ffmpeg time"
apt-get install ffmpeg 


  


  I am on Ubuntu 20.04 LTS, and try to run this the Dockerfile, from terminal, with the command :

  


  docker build -t alien35/node-web-app .


  


  This causes an error when reaching the ffmpeg part though :

  


  Sending build context to Docker daemon  9.793MB
Step 1/10 : FROM node:carbon
 ---> 8eeadf3757f4
Step 2/10 : VOLUME ["/root"]
 ---> Using cache
 ---> 3658672462de
Step 3/10 : ADD setup-ffmpeg.sh /root
 ---> c9c192aa97c5
Step 4/10 : RUN /root/setup-ffmpeg.sh
 ---> Running in b9240ac8d351
Ign:1 http://deb.debian.org/debian stretch InRelease
Get:2 http://security.debian.org/debian-security stretch/updates InRelease [53.0 kB]
Get:3 http://deb.debian.org/debian stretch-updates InRelease [93.6 kB]
Get:4 http://deb.debian.org/debian stretch Release [118 kB]
Get:5 http://deb.debian.org/debian stretch Release.gpg [2410 B]
Get:6 http://security.debian.org/debian-security stretch/updates/main amd64 Packages [529 kB]
Get:7 http://deb.debian.org/debian stretch-updates/main amd64 Packages [28.2 kB]
Get:8 http://deb.debian.org/debian stretch/main amd64 Packages [7083 kB]
Get:9 http://www.deb-multimedia.org jessie InRelease [24.6 kB]
Ign:9 http://www.deb-multimedia.org jessie InRelease
Get:10 http://www.deb-multimedia.org jessie/main Sources [60.8 kB]
Get:11 http://www.deb-multimedia.org jessie/non-free Sources [2480 B]
Get:12 http://www.deb-multimedia.org jessie/main amd64 Packages [82.8 kB]
Get:13 http://www.deb-multimedia.org jessie/non-free amd64 Packages [1776 B]
Fetched 8080 kB in 2s (3402 kB/s)
Reading package lists...
W: GPG error: http://www.deb-multimedia.org jessie InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5C808C2B65558117
W: The repository 'http://www.deb-multimedia.org jessie InRelease' is not signed.
Reading package lists...
Building dependency tree...
Reading state information...
The following NEW packages will be installed:
  deb-multimedia-keyring
0 upgraded, 1 newly installed, 0 to remove and 56 not upgraded.
Need to get 10.7 kB of archives.
After this operation, 25.6 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  deb-multimedia-keyring
Get:1 http://www.deb-multimedia.org jessie/main amd64 deb-multimedia-keyring all 2016.8.1 [10.7 kB]
debconf: delaying package configuration, since apt-utils is not installed
Fetched 10.7 kB in 0s (23.3 kB/s)
Selecting previously unselected package deb-multimedia-keyring.
(Reading database ... 29962 files and directories currently installed.)
Preparing to unpack .../deb-multimedia-keyring_2016.8.1_all.deb ...
Unpacking deb-multimedia-keyring (2016.8.1) ...
Setting up deb-multimedia-keyring (2016.8.1) ...
W: --force-yes is deprecated, use one of the options starting with --allow instead.
W: --force-yes is deprecated, use one of the options starting with --allow instead.
Reading package lists...
Building dependency tree...
Reading state information...
Package 'ffmpeg' is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 56 not upgraded.
Reading package lists...
Building dependency tree...
Reading state information...
pkg-config is already the newest version (0.29-4+b1).
pkg-config set to manually installed.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libav-tools : Depends: ffmpeg (= 10:2.6.9-dmo1+deb8u2) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
ffmpeg time
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 ffmpeg : Depends: libavcodec56 (>= 10:2.6.9) but it is not going to be installed
          Depends: libavdevice56 (>= 10:2.6.9) but it is not going to be installed
          Depends: libavfilter5 (>= 10:2.6.9) but it is not going to be installed
          Depends: libavformat56 (>= 10:2.6.9) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
The command '/bin/sh -c /root/setup-ffmpeg.sh' returned a non-zero code: 100


  


  I have tried adding the dependencies to apt-get install in my Dockerfile, and adding -f to the ffmpeg command as well, but I am still getting this error