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• Live streaming using FFMPEG via MPEG Dash

  4 février 2021, par mifol68042

  I have an application that creates gets frames for external source and creates a mp4 video every 60 seconds. I use OpenCV in Python to create an array of frames and then create a mp4 video every 60 seconds. Let's assume my file structure is like below :

  


  video_1.mp4
video_2.mp4
video_3.mp4


  


  Now I want this to be made into a live stream using FFMPEG via Apple HLS or MPEG Dash. I tried to run the following command to convert mp4 to hls :

  


  ffmpeg -i video_1.mp4 -codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls test.m3u88


  


  I did a cat of the test.m3u88 file, I can see the following output :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:50
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:50.000000,
test30.ts
#EXTINF:50.000000,
test31.ts
#EXTINF:25.000000,
test32.ts
#EXT-X-ENDLIST


  


  Next I did the same command for the video_2.mp4 but the contents of test.m3u88 is getting overwritten. I am not able to understand how to append to existing segments.

  


  My aim for this problem is that if I can append to the test.m3u88 file I can achieve live stream in my front end app. Is this the right way to get live stream or should I take another approach ? Please let me know examples if any that can help me on getting live stream to web app.

  


• dashenc : set DASH related options for the subsequent matroska muxer when using webm

  29 octobre 2017, par Peter Große

  dashenc : set DASH related options for the subsequent matroska muxer when using webm
  This patch is inspired by the ffmpeg webm_chunk muxer and fixes that all resulting
  
  tracks have the same track number.
  Signed-off-by : Peter Große <pegro@friiks.de>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/dashenc.c

• Video - extract image from DASH m4s file using ffmpeg

  6 juillet 2017, par Yogevnn

  I’m trying to create a thumbnail from a dash stream m4s file.

  I have the mpd, init.mp4 file and the m4s files.

  I have the code using nodeJS ffmpeg package that extracts image from an mp4 file :

  try {
  
  var process = new ffmpeg('video.mp4');
  
  process.then(function (video) {
  
      // Callback mode
  
      video.fnExtractFrameToJPG('C:\\files\\nodejs', {
  
          start_time: `1:50:30`,
  
          frame_rate : 1,
  
          file_name : 'my_frame_%t_%s'
  
      }, function (error, files) {
  
          if (!error)
  
              console.log('Frames: ' + files);
  
      });
  
  }, function (err) {
  
      console.log('Error: ' + err);
  
  });
  
  } catch (e) {
  
  console.log(e.code);
  
  console.log(e.msg);
  
  }

  But because i’m reading my files from a dash-stream i’m getting an m4s files.

  I’ve tried to convert the m4s format into mp4 and then use the code above, but the ffmpeg( fluent-ffmpeg to be exact) is returning an error message

  an error occured : ffmpeg exited with code 1 :
  C :\files\nodejs\testFiles\000000.m4s : Invalid data found when
  processing input

  The code i used to convert is :

  var proc = new fluent({source: "C:\\files\\nodejs\\testFiles\\000000.m4s", 
  
  nolog: true})
  
  
  
  //useless i think - not working
  
  //proc.setFfmpegPath("C:\\files\\ffmpeg-20170620-ae6f6d4-win64-static\\bin")
  
  
  
  proc.withSize('50%').withFps(24).toFormat('mp4')
  
  
  
  .on('end', function(){
  
  console.log('file has been converted successfully');
  
  })
  
  .on('error', function(err){
  
      console.log('an error occured: ' + err.message);
  
  
  
  })
  
  
  
  .saveToFile("C:\\files\\nodejs\\new.mp4");

  Is it possible to convert a single m4s file to mp4 ?

  If not, what is the right way of converting m4s to mp4 using ffmpeg with nodejs ?

  I couldn’t find any reference for that, but if it is possible to extract an image directly from the m4s file i think it will solve the problem faster.

  It is possible to use this site to download all the *.m4s files, mpd and init.mp4 files using the network section (f12 in Chrome browser) and check the code.