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• FFMPEG ldash 1 low latency option but dash.js not low latency and buggy with lag and start always at 0 cannot control

  7 avril 2021, par Jintor

  I can't figure out how to fix this. playing a supposed low latency mpeg-dash manifest but it's with lots of lag, and play-stop-wait-play-stop-wait....

  


  I have latest ubuntu with latest ffmpeg

  


  here the command

  


  ffmpeg -re -i file.webm -c:v libx264 -preset ultrafast -tune zerolatency -c:a aac -ac 2 -strict -2 -crf 18 -profile:v baseline -maxrate 1000k -pix_fmt yuv420p -bufsize 969k -ldash 1 -streaming 1 -use_template 0 -use_timeline 1 -seg_duration 1 -remove_at_exit 0 -f dash index.mpd


  


  and player side

  


  <code class="echappe-js">&lt;script src='http://stackoverflow.com/templates/account_js/dashjs/dash.3.1.0.min.js'&gt;&lt;/script&gt;&#xA;    
  &#xA;    &lt;script&gt;&amp;#xA;    (function(){&amp;#xA;        var url = &quot;index.mpd&quot;;&amp;#xA;        var player = dashjs.MediaPlayer().create();&amp;#xA;        player.initialize(document.querySelector(&quot;#videoPlayer&quot;), url, true);&amp;#xA;        player.updateSettings({&amp;#xA;            streaming: {&amp;#xA;                 lowLatencyEnabled: true, &amp;#xA;                 liveDelay: 3,&amp;#xA;                 liveCatchup: {&amp;#xA;                    enabled: true,&amp;#xA;                    minDrift: 0.05,&amp;#xA;                    maxDrift: 0,&amp;#xA;                    playbackRate: 0.5,&amp;#xA;                    latencyThreshold: 30    &amp;#xA;                  }&amp;#xA;            }&amp;#xA;        });&amp;#xA;    })();     &amp;#xA;    video = document.getElementById(&quot;videoPlayer&quot;);&amp;#xA;    video.addEventListener(&quot;loadedmetadata&quot;, function(){ video.muted = true; video.play(); }, false);&amp;#xA;    &lt;/script&gt;&#xA;
  

  


  but it's NOT low latency, It forces to start at 0 and cannot control the video

  


  is there a better config setup and what need to be fixed : ffmpeg options or dash.js config

  


• 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.

• 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