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• Adaptive part in MPD using MP4box

  28 janvier 2019, par enigmaVada

  I have used ffmpeg to encode audio and video files of my video sample.mp4 for the dash player. The commands are as follows :

  ffmpeg -i sample.mp4 -s 426x240 -c:v libx264 -b:v 640k -g 90 -an sample_video_240.mp4
  
  ffmpeg -i sample.mp4 -s 480x360 -c:v libx264 -b:v 960k -g 90 -an sample_video_360.mp4
  
  ffmpeg -i sample.mp4 -s 640x480 -c:v libx264 -b:v 1280k -g 90 -an sample_video_480.mp4
  
  ffmpeg -i sample.mp4 -s 1280x720 -c:v libx264 -b:v 2560k -g 90 -an sample_video_720.mp4
  
  
  
  ffmpeg -i sample.mp4 -c:a aac -b:a 128k -vn sample_audio.mp4

  I have generated 240p,360p,480p and 720p videos and audio file.

  Then I have used mp4box to generate the mpd file using the following command :

  mp4box -dash 10000 -rap -profile dashavc264:onDemand -mpd-title BBB -out sample.mpd -frag 5000 sample_audio.mp4 sample_video_240.mp4 sample_video_360.mp4 sample_video_480.mp4 sample_video_720.mp4 

  I am using the dash.js player to play the video. The problem is, the adaptive part of DASH isn’t working. The player is just using the 240p video and not switching to a better format even if proper bandwidth is available. I am checking using the network tab of chrome dev tools.

  What am i doing wrong ? Please help.

  Here is the mpd file for reference :

  <?xml version="1.0"?>
  
  
  
  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" minbuffertime="PT1.500S" type="static" mediapresentationduration="PT0H1M9.869S" maxsegmentduration="PT0H0M9.985S" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011,http://dashif.org/guidelines/dash264">
  
   <programinformation moreinformationurl="http://gpac.io">
  
    
  
   </programinformation>
  
  
  
   <period duration="PT0H1M9.869S">
  
    <adaptationset segmentalignment="true" lang="und" subsegmentalignment="true" subsegmentstartswithsap="1">
  
     <representation mimetype="audio/mp4" codecs="mp4a.40.2" audiosamplingrate="44100" startwithsap="1" bandwidth="130920">
  
      <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
  
      <baseurl>sample_audio_dashinit.mp4</baseurl>
  
      <segmentbase indexrangeexact="true" indexrange="902-1017">
  
        <initialization range="0-901"></initialization>
  
      </segmentbase>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" group="1" maxwidth="426" maxheight="240" maxframerate="30" par="426:240" lang="und" subsegmentalignment="true" subsegmentstartswithsap="1">
  
     <representation mimetype="video/mp4" codecs="avc1.640015" width="426" height="240" framerate="30" sar="1:1" startwithsap="1" bandwidth="590708">
  
      <baseurl>sample_video_240_dashinit.mp4</baseurl>
  
      <segmentbase indexrangeexact="true" indexrange="914-1053">
  
        <initialization range="0-913"></initialization>
  
      </segmentbase>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" group="1" maxwidth="640" maxheight="480" maxframerate="30" par="4:3" lang="und" subsegmentalignment="true" subsegmentstartswithsap="1">
  
     <representation mimetype="video/mp4" codecs="avc1.64001E" width="480" height="360" framerate="30" sar="1:1" startwithsap="1" bandwidth="883873">
  
      <baseurl>sample_video_360_dashinit.mp4</baseurl>
  
      <segmentbase indexrangeexact="true" indexrange="914-1053">
  
        <initialization range="0-913"></initialization>
  
      </segmentbase>
  
     </representation>
  
     <representation mimetype="video/mp4" codecs="avc1.64001E" width="640" height="480" framerate="30" sar="1:1" startwithsap="1" bandwidth="1188712">
  
      <baseurl>sample_video_480_dashinit.mp4</baseurl>
  
      <segmentbase indexrangeexact="true" indexrange="913-1052">
  
        <initialization range="0-912"></initialization>
  
      </segmentbase>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" group="1" maxwidth="1280" maxheight="720" maxframerate="30" par="16:9" lang="und" subsegmentalignment="true" subsegmentstartswithsap="1">
  
     <representation mimetype="video/mp4" codecs="avc1.64001F" width="1280" height="720" framerate="30" sar="1:1" startwithsap="1" bandwidth="2365717">
  
      <baseurl>sample_video_720_dashinit.mp4</baseurl>
  
      <segmentbase indexrangeexact="true" indexrange="914-1053">
  
        <initialization range="0-913"></initialization>
  
      </segmentbase>
  
     </representation>
  
    </adaptationset>
  
   </period>
  
  </mpd>

• Container does not reflect MediaReader setting

  8 mars 2014, par Mondain

  I would like my reader to be able to handle audio, when it does not start with the video ; hence the setting of "AddDynamicStreams". How do I get the container to recognize the setting of the reader from which it originated ? Is there a flag or some other property that I need to set ?

  String inputUrl = "rtmp://127.0.0.1:1935/myapp/mystream live=1 buffer=1";
  
  IMediaReader reader = ToolFactory.makeReader(inputUrl);
  
  reader.setCloseOnEofOnly(false);
  
  reader.setQueryMetaData(false);
  
  // we want dynamic addition of streams
  
  reader.setAddDynamicStreams(true);
  
  // this shows "true"
  
  log.debug("Reader can dynamically add streams: {}", reader.canAddDynamicStreams());
  
  // get the container
  
  IContainer container = reader.getContainer();
  
  // this shows "false"
  
  log.debug("Container can dynamically add streams: {}", container.canStreamsBeAddedDynamically());

• What the correct args for ffmpeg conversion

  8 novembre 2013, par Andrew Simpson

  I have a C# app. I am using ffmpge to convert jpgs to an OGG file. I use the process class to write to a stream buffer within my app using piping without having to write the ogg file to a disk. I then upload these bytes to my server where it is written to the hard drive.

  On the server side I want to convert it to say an mp4 format. Again, I want to pipe it out to a stream buffer and allow my User to download the file.

  This is my code :

  Process _serverBuild = null ;

  public byte[] EncodeAndUploadImages(string _args1)
  
  {
  
      byte[] _data = null;
  
      try
  
      {
  
          _args1 = "ffmpeg.exe -i \"c:\\Cloud\\Zipped\\000EC902F17F\\f3e45e44-b61c-472b-8dc1-a8e9b9511497_00007.ogg\" avi -";
  
          _serverBuild = new Process();
  
  
  
          _serverBuild.StartInfo.WorkingDirectory = Environment.CurrentDirectory;
  
          _serverBuild.StartInfo.Arguments = _args1;
  
          _serverBuild.StartInfo.FileName =  @"C:\inetpub\wwwroot\bin\ffmpeg.exe";
  
          _serverBuild.StartInfo.UseShellExecute = false;
  
          _serverBuild.StartInfo.RedirectStandardOutput = true;
  
          _serverBuild.StartInfo.RedirectStandardError = true;
  
          _serverBuild.StartInfo.RedirectStandardInput = true;
  
          _serverBuild.StartInfo.CreateNoWindow = true;
  
          _serverBuild.StartInfo.LoadUserProfile = false;
  
          _serverBuild.ErrorDataReceived += _server_ErrorDataReceived;
  
          _serverBuild.OutputDataReceived += _server_OutputDataReceived;
  
          _serverBuild.Exited += new EventHandler(_server_Exited);
  
          _serverBuild.EnableRaisingEvents = true;
  
          _serverProcessHasFinished = false;
  
          _serverBuild.Start();
  
  
  
          mStandardOutput = _serverBuild.StandardOutput.BaseStream;
  
          mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);            
  
          _serverBuild.WaitForExit();
  
  
  
  
  
  
  
  
  
      }
  
      catch (Exception _ex)
  
      {
  
  
  
      }
  
      finally
  
      {
  
          _serverBuild.ErrorDataReceived -= _server_ErrorDataReceived;
  
          _serverBuild.OutputDataReceived -= _server_OutputDataReceived;
  
          _serverBuild.Dispose();
  
      }
  
      return _data;
  
  }
  
  
  
  byte[] mReadBuffer = new byte[4096];
  
  MemoryStream mStandardOutputMs = new MemoryStream();
  
  Stream mStandardOutput;
  
  
  
  private void StandardOutputReadCallback(IAsyncResult ar)
  
  {
  
      try
  
      {
  
          int numberOfBytesRead = mStandardOutput.EndRead(ar);
  
          {
  
              mStandardOutputMs.Write(mReadBuffer, 0, numberOfBytesRead);
  
              mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);
  
          }
  
      }
  
      catch (Exception _ex)
  
      {
  
  
  
      }
  
  }

  The error I get (when I test with a bat file and run within a DOS prompt) is :

  

  Obviously my parameters are at fault. I want to keep it simple as I may want to use other formats apart from MP4.

  Thanks