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• Live streaming using FFMPEG to web audio api

  19 janvier 2014, par Nayan

  I am trying to stream audio using node.js + ffmpeg to browsers connected in LAN only using web audio api.

  Not using element because it's adding it's own buffer of 8 to 10 secs and I want to get maximum high latency possible (around 1 to 2 sec max).

  Audio plays successfully but audio is very choppy and noisy.

  Here is my node.js (server side) file :

  var ws = require('websocket.io'), 
  
  server = ws.listen(3000);
  
  var child_process = require("child_process");
  
  var i = 0;
  
  server.on('connection', function (socket) 
  
  {
  
  
  
  console.log('New client connected');
  
  
  
  var ffmpeg = child_process.spawn("ffmpeg",[
  
      "-re","-i",
  
      "A.mp3","-f",
  
      "f32le",
  
      "pipe:1"                     // Output to STDOUT
  
      ]);
  
  
  
   ffmpeg.stdout.on('data', function(data)
  
   {
  
      var buff = new Buffer(data);
  
      socket.send(buff.toString('base64'));
  
   });
  
  });

  And here is my HTML :

  var audioBuffer = null;
  
  var context = null;
  
  window.addEventListener('load', init, false);
  
  function init() {
  
      try {
  
          context = new webkitAudioContext();
  
      } catch(e) {
  
          alert('Web Audio API is not supported in this browser');
  
      }
  
  }
  
  
  
  var ws = new WebSocket("ws://localhost:3000/");
  
  
  
  ws.onmessage = function(message)
  
  {
  
      var d1 = base64DecToArr(message.data).buffer;
  
      var d2 = new DataView(d1);
  
  
  
      var data = new Float32Array(d2.byteLength / Float32Array.BYTES_PER_ELEMENT);
  
      for (var jj = 0; jj < data.length; ++jj)
  
      {
  
          data[jj] = d2.getFloat32(jj * Float32Array.BYTES_PER_ELEMENT, true);
  
      }
  
  
  
      var audioBuffer = context.createBuffer(2, data.length, 44100);
  
      audioBuffer.getChannelData(0).set(data);
  
  
  
      var source = context.createBufferSource(); // creates a sound source
  
      source.buffer = audioBuffer;
  
      source.connect(context.destination); // connect the source to the context's destination (the speakers)
  
      source.start(0);
  
  };

  Can any one advise what is wrong ?

  Regards,
  Nayan

• JW Player can't play mp4 video downloaded from youtube

  20 janvier 2015, par kheya

  I have doenloaded am mp4 video using IE Realplayer plugin from youtube.
  https://www.youtube.com/watch?v=e3a80c5Ar3Y

  I have a test site on my local machine where I have HTML5 JW Player.

  I download the video and then play locally using realplay to see if it plays.
  I notice that not all mp4 downloads from youtube plays in Realplayer.
  The ones that play in Realplayer also play in JW Player on local website.
  But the mp4 files that don’t play in Realplayer also don’t play in JW player.

  This is the error I get in the player :
  the video playback was aborted due to a corruption problem or because the video used features your browser didnot support mylocalsite/xyz.mp4 undefined

  I tested IE, FF, Chrome. It works nowhere.

  Here is my jw player setup and html :

  <video src="mylocalsite/test.mp4" type="video/mp4" poster="mylocalsite/test.jpg" width="640" height="360"></video>

  player setup :

  var modes = '';
  
  var swfPath = '/content/jw/player.swf';
  
              if (navigator.userAgent.toLowerCase().match(/(android)/) || navigator.userAgent.toLowerCase().match(/(chrom)/)) {                
  
                  modes = [{ type: 'flash', src: swfPath }, { type: "html5"}];
  
              } else {
  
                  modes = [{ type: 'html5' }, { type: 'flash', src: swfPath }, { type: "download"}];
  
              }
  
  
  
  jwplayer('container').setup({                
  
                  'flashplayer': swfPath,                
  
                  'width': '640',
  
                  'height': '360',
  
                  'provider': 'video',
  
                  'modes': modes,                
  
              });

  Here is the details info about the file returned by ffmpeg :

  ffmpeg version 1.1.4 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 31 2013 02:49:36 with gcc 4.6.2 (GCC)
  
    configuration: --prefix=/c/Users/Administrator/ffmpeg --extra-cflags=-I/c/User
  
  s/Administrator/ffmpeg/include --extra-ldflags=-L/c/Users/Administrator/ffmpeg/l
  
  ib --cpu=i686 --enable-gpl --enable-libfdk-aac --enable-libx264 --enable-nonfree
  
  
  
    libavutil      52. 13.100 / 52. 13.100
  
    libavcodec     54. 86.100 / 54. 86.100
  
    libavformat    54. 59.106 / 54. 59.106
  
    libavdevice    54.  3.102 / 54.  3.102
  
    libavfilter     3. 32.100 /  3. 32.100
  
    libswscale      2.  1.103 /  2.  1.103
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\videos\woh.mp4':
  
    Metadata:
  
      major_brand     : dash
  
      minor_version   : 0
  
      compatible_brands: iso6avc1mp41
  
      creation_time   : 2013-09-08 23:34:28
  
    Duration: 00:03:50.96, start: 0.000000, bitrate: 189 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 480x360,
  
  187 kb/s, 25 tbr, 90k tbn, 50 tbc
  
      Metadata:
  
        creation_time   : 2013-09-08 23:34:28
  
        handler_name    : VideoHandler

  What can be causing this issue ?

• Video created via ffmpeg will not play on iPhone 10 or Huawei Android using Chrome

  17 février 2020, par MHatton

  I have created a video from a image and adding an MP3 file. It plays fine on my Moto G Android phone and on my desktop, but a collegue has said it will not play on his iPhone 10 or Huawei Android phone running Chrome.

  Does the following ffmpeg need an extra command adding to make the created MP4 more compatible across devices ?

  ffmpeg -loop 1 -i 6f4aa5dfefc4dd32186f41315ad9d1e2-0.png -i "download.mp3" -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest aw-slide0.mp4