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• Using ffmpeg to record 15 minute segments of a live audio stream

  6 août 2015, par David

  I currently have a code setup to record a live streaming audio file from a given url to an mp3 file until I terminate the program.

  fmpeg(obj.url)
  
  .noVideo()
  
  .format('mp3')
  
      .on('error', function(err, stdout, stderr) {
  
      console.error(err);
  
      console.error(stdout);
  
      console.error(stderr)
  
    })

  I already have it set up so that it will create a new file every time the ffmpeg is called. All I need is a way to have ffmpeg stop, and then start again, every 15 minutes.

  I know duration will stop it after 15 minutes, but I don’t know of anything that will start the same ffmpeg file again after this.

• How to use ffmpeg to transcode many live streamed videos ? [closed]

  21 septembre 2020, par user14258924

  PREMISE

  


  As a pet project, I am writing a live video streaming service, in Go, that can consume video streams from OBS via SRT(TS -> h264/aac) and RTMP(FLV -> h264/aac) protocols and am planning to support streaming video from web browser as well, captured from a web camera via JS. This ingress server will receive many video streams in various containers and codecs and I need to normalize them into single container and codec and then create multiple versions for various bitrates(ie. 240p, 360p, 480p, 720p, 1080p...) to pass along where needed in the application. Each stream is split into 2 second GOP segments, separate for audio and video track, that will produce fragmented MP4 as the end result - which can be consumed by web browser.

  


  The issue is that I am using Go which has no libraries for transcoding video so I need to use either ffmpeg or vlc, which is a C code. I have decided to avoid the CGo route and use ffmpeg/vlc as standalone binaries.

  


  QUESTION

  


  My question is how to use either of these project in the most efficient way - avoiding the use of files in favour of unix sockets/streams and also the performance aspect - handling hundreds of video segments in any one time and in sufficient time to avoid creating too much of a lag beteen producer and consumer.

  


  So let's say I will pick the most used one - ffmpeg, how should I actually use it to achieve what I have described ? How would you set it up and which flags/config to use with it ?

  


  Can the performance be even achieved or is it just too much and I will need some sort of ffmpeg cluser to even come close to some useful performance/low delay ?

  


• How do I close a Node.js FFMPEG child process that is actively streaming from a live capture source ?

  1er juin 2013, par RickZ

  I'm new to Node.js and have figured out how to utilize child.spawn to launch an instance of FFMPEG that is being used to capture live video and send it over to Adobe Media Server via rtmp.

  Every example I've seen of FFMPEG being used in conjunction with Node.js has been with a time limited sample, so the child process closes once FFMPEG reaches the end of the file it is converting.

  In this case, there is no "end of file".

  If I instantiate :

      var ffmpeg = child.spawn('ffmpeg.exe', [args]);

  it creates the live feed.

  I have tried immediately shutting the child process down with a :

      setTimeout(function() {
  
          ffmpeg.stdin.resume();
  
          ffmpeg.stdin.write('insert command to echo q to close FFMPEG');
  
          ffmpeg.stdin.end();
  
      });

  However, that does not seem to work. I continue to see my rtmp feed on my test box.

  Is there any way to pass FFMPEG a shut down command via stdin in Node.js ?

  Thanks in advance !

  Rick