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• Play UDP live video stream in UWP

  19 avril 2018, par Nicolas Séveno

  I need to display a live video stream in a UWP application.

  The video stream comes from a GoPro. It is transported by UDP messages. I think it is a MPEG-2 TS stream.

  I can play it successfully using FFPlay with the following command line :

  ffplay -fflags nobuffer -f:v mpegts udp://:8554

  I would like to play it with MediaPlayerElement without using a third party library.

  According to the following page :
  https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/supported-codecs
  UWP should be able to play it. (I installed the "MPEG 2 video extension" in the Windows Store).

  I tried using DatagramSocket and the MessageReceived event to receive the UDP packets, it works without problem :

  _datagramSocket = new DatagramSocket();
  
  _datagramSocket.MessageReceived += (s, args) =>
  
  {
  
      Debug.WriteLine("message received");
  
  };
  
  await _datagramSocket.BindServiceNameAsync(8554);

  Then I create a MseStreamSource :

  _mseStreamSource = new MseStreamSource();
  
  _mseStreamSource.Opened += (_, __) =>
  
  {
  
      _mseSourceBuffer = _mseStreamSource.AddSourceBuffer("video/mp2t");
  
  };
  
  this.MediaSource = MediaSource.CreateFromMseStreamSource(_mseStreamSource);

  And in the DatagramSocket.MessageReceived event I send the messages to the MseStreamSource :

  using (IInputStream stream = args.GetDataStream())
  
  {
  
      _mseSourceBuffer.AppendStream(stream);
  
  }

  The AppendStream method fails with error HRESULT 0x8070000B for some packets.
  If I catch the error, the MediaPlayerElement displays the message "video not supported or incorrect file name". (not sure of the message, my Windows is in French).

  Is the MseStreamSource the correct way to display the stream ? Is there a better solution ?

• Convert *.mov file to *.mp4 with media source support

  4 février 2017, par Yerzhan Torgayev

  My goal is to play converted *.mp4 file with HTML5 Media Source Extension (MSE).
  I made a small video with iMovie on my Mac and exported this video to *.mov file. Using ffmpeg I’ve converted *.mov file to fragmented *.mp4 file.
  I used code from Mozilla Media Source tutorial to make simple html5 video player.

  https://developer.mozilla.org/en-US/docs/Web/API/Media_Source_Extensions_API/Transcoding_assets_for_MSE

  But I couldn’t get my video played with this tutorial. Other *.mp4 videos play just fine. But I have troubles with converted *.mov videos.

  I’ve checked codec support for my video.
  On this page I’ve got my codec info :

  http://nickdesaulniers.github.io/mp4info/

  track #0 codec string: mp4v
  
  track #1 codec string: mp4a.40.2
  
  track #2 codec string: tmcd
  
  MediaSource.isTypeSupported('video/mp4; codecs="mp4v, mp4a.40.2, tmcd"'); // => false

  I found that tmcd codec is not supported by MSE :

  https://cconcolato.github.io/media-mime-support/

  I couldn’t find the way to get my video work with MSE. Can anyone help me with this issue ?

• Anomalie #3386 : Spip derrière Varnish : port non-standard dans l’URL ?

  15 février 2015, par Mathieu MD

  Bien vu. La doc de `mod_rpaf` précise en effet qu’il réécrit « REMOTE_ADDR, HTTPS, and HTTP_PORT to the values provided by an upstream proxy ».

  Ça n’a pas l’air d’être le cas du module Realip de Nginx (que j’utilise), ni de mod_remoteip, qui remplace mod_rpaf depuis Apache 2.4.
  http://wiki.nginx.org/HttpRealipModule
  https://httpd.apache.org/docs/2.4/mod/mod_remoteip.html

  On pourrait forcer, dans la conf Varnish, un entête `X-Forwarded-Port` qui serait parsé directement par Spip. Quelque chose comme ça :

  • Varnish :

  Soit :
  

  sub vcl_recv 
      set req.http.X-Forwarded-Port = server.port ;
  
  

  Soit :
  

  sub vcl_recv 
      if (req.http.X-Forwarded-Proto == "https" ) 
          set req.http.X-Forwarded-Port = "443" ;
       else 
          set req.http.X-Forwarded-Port = "80" ;
      
  
  

  • Spip, dans `ecrire/inc/utils.php` :

    if (isset($_SERVER[’SERVER_PORT’])
      AND $port=$_SERVER[’SERVER_PORT’]
      AND strpos($host," :")==false)
      # X-Forwarded-Port doit être ajouté par le proxy inverse (Varnish, etc.)
      if (isset($_SERVER[’HTTP_X_FORWARDED_PORT’])
        AND $xport=$_SERVER[’HTTP_X_FORWARDED_PORT’])
        if ($http=="http" AND $xport !=80) $host.=" :$xport" ;
        if ($http=="https" AND $xport !=443) $host.=" :$xport" ;
       else 
        if ($http=="http" AND $port !=80) $host.=" :$port" ;
        if ($http=="https" AND $port !=443) $host.=" :$port" ;