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• Install dependencies for Python ffmpeg library "av" (ImportError : libx264.so missing)

  7 septembre 2018, par Make42

  In Python I installed the library av (which is a Python API for ffmpeg) into my conda environment with conda install -c conda-forge av=0.4.0, but I when I import av into my python script, I get the error message

  ImportError: libx264.so.138: cannot open shared object file: No such file or directory

  on my Linux Kubuntu 14.4 machine. How can I resolve this issue ?

  Wild guess : My Kubuntu repositories are a little old, so I cannot update ffmepg further and I guess this is why libx264 is missing, but am not sure.

• Delay in displaying a video stream after streaming by libavformat

  15 janvier 2014, par Blue Sky

  I am using libavformat library to stream a video at a network address like udp ://127.0.0.1:1000. I use ffplay to display the received video stream at the network address. However, the video appears few second later (e.g. 5 6 seconds) at ffplay on the same machine. Do you know what is the reason ?

  More info :

  I have written my own streaming application using libavformat. When I stream a 3sec 1080p video at 25fps, ffplay does not show anything. If I repeat streaming the same video once again, this time, ffplay starts displaying the previous streamed video as well as the current video. So, it looks like ffplay waits for a buffer to be filled up by some amount, and then displays the stream. But am I correct ?

• How to capture a log message coming out of node JS spawn ffmpeg command

  17 janvier 2014, par keenan

  I am trying to find the silent parts of an audio recording. This command does exactly what I want on my local machine.

  ffmpeg -i http://twf-audio.s3.amazonaws.com/uploads/DBC50460-9A5C-4174-9885-07337A582D58_1377839443598_tell.m4a -af silencedetect=n=-40dB:d=0.2 -f null -

  It sends a bunch of messages to the command line including these last three which are the lines of data that I need. (for reference : ffmpeg silencedetect docs)

  [silencedetect @ 0x7feea040cf20] silence_start : 0.0321995

  [silencedetect @ 0x7feea040cf20] silence_end : 0.975238 | silence_duration : 0.943039

  [silencedetect @ 0x7feea040cf20] silence_start : 1.47184

  I cannot figure out how to get that message out. Here is the nodejs code that is running. The only event that is triggered is the 'exit'. I thought that "pipe:1" sends output to stdout but that does not do anything.

  var ffmpeg = spawn('ffmpeg', ['-i',filename,'-af','silencedetect=n=-40dB:d=0.2', '-f', 'null','-y', 'pipe:1' ]);
  
  
  
  ffmpeg.on('message', function(data) {
  
      console.log('ffmpeg2 PARENT got message:', JSON.stringify(data));
  
  });
  
  
  
  ffmpeg.stdout.on('data', function(data) {
  
      console.log('ffmpeg stdout data = '+JSON.stringify(data) );
  
  });
  
  
  
  ffmpeg.on('exit', function (code, signal) {
  
    console.log('child process exited with code:' + code + ' signal:' + signal);
  
  });