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• Live streaming multiple bitrates with FFmpeg and node.js

  14 juillet 2014, par user2757842

  I am looking for an efficient way of transcoding a live stream and breaking it up into different bit rates, I have it working as of now but I have to state each time which video I would like to address as well as each different bit rate, example below :

  var spawn = require('child_process').spawn;
  
  
  
  /*
  
  var ffmpeg = spawn('C:\\Users\\Jay\\Documents\\FFMPEG\\bin\\ffmpeg.exe', [
  
      '-i',
  
      'rtmp://192.168.201.8/livepkgr/livestream2 live=1',
  
      '-movflags',
  
      'isml+frag_keyframe',
  
      '-f',
  
      'ismv',
  
      'http://192.168.201.237/LiveSmoothStreaming.isml/Streams(video2)'
  
  ]);
  
  */
  
  
  
  var ffmpeg = spawn('C:\\Users\\Jay\\Documents\\FFMPEG\\bin\\ffmpeg.exe', [
  
      '-i',
  
      'rtmp://192.168.201.8/livepkgr/livestream live=1',
  
      '-ac',
  
      '2',
  
      '-b:a',
  
      '64k',
  
      '-c:v',
  
      'libx264',
  
      '-b:v:0',
  
      '150k' /* first bit rate i want */ ,
  
      '-movflags',
  
      'isml+frag_keyframe',
  
      '-f',
  
      'ismv',
  
      'http://192.168.201.237/LiveSmoothStreaming2.isml/Streams(video1)',
  
      '-c:v',
  
      'libx264',
  
      '-b:v:0',
  
      '500k' /* second bit rate i want */ ,
  
      '-movflags',
  
      'isml+frag_keyframe',
  
      '-f',
  
      'ismv',
  
      'http://192.168.201.237/LiveSmoothStreaming2.isml/Streams(video3)'
  
  ]);

  As you can see, this is not a very efficient way of doing it as this is only for 2 bit rates, I have to give a video name (video1, video 3 etc) each time I want a new bit rate and then I have to give it it’s bit rate (150k, 500k etc). If I wanted anymore bitrates, the code lines would go on and on and it would quickly become messy.

  Has anyone worked within the world of Node.js and FFmpeg that could maybe point me in the direction of managing this more efficiently ? Or even link me to a page which would help me out ?

  Cheers

• creating illusion of live streaming (internet radio) using ffmpeg

  29 décembre 2014, par user259060

  I am working on a project that involves live streaming but without seeking (just like internet radio). I am using ffmpeg and ffserver.

  • I could just send the song to ffserver feed using ffmpeg but the problem is that the whole song / file is getting dumped. I don’t want that to happen.

  • First I segmented the song using ffmpeg -threads 1 -i INPUT.mp3 -ar 24000 -acodec libmp3lame -ac 1 -aq 1 -ab 64k -map 0:0 -f segment -segment_time 2 -segment_list /PATH/TO/LIST/outputlist.m3u8 -segment_format mpegts /OUTPUT/PATH/output%05d.mp3 (this is just an example) .

  • As you can see that the segment time is 2 seconds. What I’m actually planning to achieve is that I want to send first segmented file say output00001.mp3 to ffserver feed and wait for 1 second then send the the second segmented files say output00002.mp3 to ffserver feed and so on till the end of the song. This creates an illusion of radio live streaming. I was able to implement this without a problem using python.

  PROBLEM :

  The problem I faced while listening to song (htttp ://foo:port/test1.mp3) is that after 2nd second I hear a few millisecond pause and then the song continues to play which is very irritating. This happens after every segmented song completes playing. Is there any solution to eradicate the pause ? Is there a technique to make song play live (that means if my server shuts down, the song should stop immediately) ?

• Is no signal in live stream a subtitle if yes then how to read it ? [on hold]

  14 mars 2017, par A Sahra

  I am streaming live from an rtsp source link using ffmpeg,in someways i get no signal text in my video,my question is,is that view a subtitle in my video or it’s a single frame showing when there is no video stream ? i am doing this because when i don’t have video from source and the message pops up i want to stop streaming there ? by reading (no signal) subtitle,if that is not the case so how do i stop streaming when there is no video coming from source and how to do it by using ffprobe.