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• dash.js : four channels audio streaming

  19 juillet 2016, par Carlos Chacon

  Does dash.js supports 4 channels in the audio stream ?

  I’m using mp4 container : video : h254 and audio : AAC.

  For the case that the AAC audio stream is 2 channels it works fine, both video and audio play correctly. But 4 channels does NOT work.

  I’m using FFMPEG to create the files and WOWZA to setup the DASH streaming.

  For the case that the AAC audio stream is 4 channels I get the following error :

   Video can't be played because the file is corrupt.

  Command line to generate the 2-channels file :

  ffmpeg -i video_in.mp4 -i audio_in_4ch.wav -c:v copy -c:a aac -ac 2 output_2channels.mp4

  Command line to generate the 4-channels file :

  ffmpeg -i video_in.mp4 -i audio_in_4ch.wav -c:v copy -c:a aac -ac 4 output_4channels.mp4

  This is the fmmpeg -i information printed for each file :

  2 Channels output file details :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output_2channels.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.37.101
  
    Duration: 00:00:17.59, start: 0.000000, bitrate: 901 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1024x512 [SAR 1:1 DAR 2:1], 894 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 129 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  4 Channels output file details :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output_4channels.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.37.101
  
    Duration: 00:00:17.59, start: 0.000000, bitrate: 1038 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1024x512 [SAR 1:1 DAR 2:1], 894 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 4.0, fltp, 265 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  4 Channels output file mdp file :

  <?xml version="1.0" encoding="UTF-8"?>
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" publishtime="2016-07-19T05:56:28Z" mediapresentationduration="PT17.585S" minbuffertime="PT1.5S">
  
  <programinformation>
  
      
  
  </programinformation>
  
  <location>http://192.168.0.103:1935/vod/_definst_/mp4:output_4channels.mp4/manifest_w882219731.mpd</location>
  
  <period start="PT0.0S">
  
      <baseurl>http://192.168.0.103:1935/vod/_definst_/mp4:output_4channels.mp4/</baseurl>
  
      <adaptationset mimetype="video/mp4" width="1024" height="512" par="1024:512" framerate="30000/1001" segmentalignment="true" startwithsap="1" subsegmentalignment="true" subsegmentstartswithsap="1">
  
          <segmenttemplate presentationtimeoffset="0" timescale="90000" media="chunk_ctvideo_rid$RepresentationID$_cs$Time$_w882219731_mpd.m4s" initialization="chunk_ctvideo_rid$RepresentationID$_cinit_w882219731_mpd.m4s">
  
              <segmenttimeline>
  
                  <s t="0" d="1582650"></s>
  
              </segmenttimeline>
  
          </segmenttemplate>
  
          <representation codecs="avc1.42c01e" sar="1:1" bandwidth="894760"></representation>
  
      </adaptationset>
  
      <adaptationset mimetype="audio/mp4" lang="eng" segmentalignment="true" startwithsap="1" subsegmentalignment="true" subsegmentstartswithsap="1">
  
          <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
  
          <segmenttemplate presentationtimeoffset="0" timescale="48000" media="chunk_ctaudio_rid$RepresentationID$_cs$Time$_w882219731_mpd.m4s" initialization="chunk_ctaudio_rid$RepresentationID$_cinit_w882219731_mpd.m4s">
  
              <segmenttimeline>
  
                  <s t="0" d="844080"></s>
  
              </segmenttimeline>
  
          </segmenttemplate>
  
          <representation codecs="mp4a.40.2" audiosamplingrate="48000" bandwidth="265851">
  
          </representation>
  
      </adaptationset>
  
  </period>
  
  </mpd>

  HTML Player Code :

  <code class="echappe-js">&lt;script src=&quot;http://cdn.dashjs.org/latest/dash.all.min.js&quot;&gt;&lt;/script&gt;
  
         
  
  

• MPEG DASH (MPD) to MP4 in Node.js ?

  28 janvier 2024, par Hello World

  I am trying to convert streams to .mp4 files. I have successfully converted an HLS to MP4 using fluent-ffmpeg package on version 2.1.2. I did so with with the following code :

  


  var ffmpegCommand = ffmpeg();
            ffmpegCommand
            .input(HLS FILE HERE)
            .inputOptions('-protocol_whitelist file,http,https,tcp,tls,crypto,data')
            .on("error", (err, stdout, stderr) => {
                console.log(err)
                let error = new Error(err.message)
                error.code = err.code || 'FILE_CONVERSION_M3U8_TO_MP3/UNKNOWN_ERROR';
                error.status = err.status || 500;

                console.log('An error occurred: ' + err.message, err, stderr);
                reject(error)
            })
            .on("end", () => {
                console.log(temporaryFilePath2)
                resolve(temporaryFilePath2);
            })
            .on('progress', function(progress) {
                console.log('progress: ' + (progress.percent || 0).toFixed(2) + '%。');
                progressGathering.push((progress.percent || 0).toFixed(2))

                if(progressGathering.length == 10 && progressGathering[9] == 0.00){
                    let error = new Error("File is a live stream.")
                    error.code = 'FILE_CONVERSION_M3U8_TO_MP3/LIVESTREAM_SUPPORT'
                    error.status = 501

                    ffmpegCommand.kill()
                    reject(error)
                }
            })
            .inputOptions('-allowed_extensions ALL')
            .outputOptions("-c copy")
            .output(temporaryFilePath2)
            .run();

            setTimeout(() => {
                ffmpegCommand.kill();
                let error = new Error("The file selected was too large or the network was hanging. Conversion timeout.")
                error.code = 'FILE_CONVERSION_M3U8_TO_MP3/TIMEOUT'
                error.status = 599;
                reject(error)
            }, 300000) // 5 minutes


  


  However, when I attempt something similar with a mpd file url in the input, I get several errors that are all the same :

  


  ffmpeg exited with code 1: https://dash.akamaized.net/akamai/bbb_30fps/bbb_30fps.mpd: Invalid data found when processing input

  


  Is this something fluent-ffmpeg can't handle ? If so, I would like to know another package that can accomplish this.

  


• avformat/Makefile : Remove false dependency of WebM DASH manifest muxer

  7 avril 2020, par Andreas Rheinhardt

  avformat/Makefile : Remove false dependency of WebM DASH manifest muxer
  It does not use anything from libavformat/matroska.c.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/Makefile