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• ffmpeg on android : playing MPEG2 TS udp multicast stream

  27 août 2013, par user1513822

  I want to make android media player using ffmpeg.
  (catch MPEG2 TS multicast stream via WIFI network and decode it)
  I checked followings :

  • My iptime AP supports WIFI multicast protocol.
    (send multicast stream in wired PC, and wifi connected PC can receive it)
  • My Android phone can receive multicast stream via WIFI.
    I coded NDK socket programming which is join udp multicast group and receive packets
    (I added multicast access grant to AndroidManifest.xml)
  • FFMPEG library is ported to android and it can play local media file.

  But when I try to open network stream using FFMPEG library, avformat_open_input() function returns fail.

  gFormatCtx = avformat_alloc_context();
  
  av_register_all(); 
  
  avcodec_register_all(); 
  
  avformat_network_init(); 
  
  if(avformat_open_input(&gFormatCtx,"udp://@239.100.100.100:4000",NULL,NULL) != 0)
  
      return -2;

  this code always return "-2".
  If I use "av_dict_set()" api, which option should I use ?

  av_dict_set(&options, "udp_multicast", "mpegtsraw", 0);

  please let me know what should I check for avformat_open_input error ?

  thanks.

• NodeJS - How to pipe same video stream to multiple clients ?

  30 août 2013, par SergioBR

  We have a situation trying to serve a video stream.

  Since HTML5 video tag does not support udp to multicast, we are trying to re-use an already converted ffmpeg stream and send it to more than one response. But that does not work.

  The first response gets the stream alright, but the second one does not.
  It seems that the stream cannot be piped out to another response, neither can it be cloned.

  Has anyone done that before ? Any ideas ?

  Thanks in advance !

  Here's the code :

  var request = require('request');
  
  var http = require('http');
  
  var child_process = require("child_process");
  
  var n = 1;
  
  var stdouts = {};
  
  
  
  http.createServer(function (req, resp) {
  
  
  
  console.log("***** url ["+req.url+"], call "+n);
  
  
  
  if (req.url != "/favicon.ico" && req.url != "/")
  
  {
  
  var params = req.url.substring(1).split("/");
  
  
  
  switch (params[0])
  
  {
  
    case "VIEW":
  
      if (params[1] == "C2FLOOR1" || params[1] == "C2FLOOR2" || params[1] == "C2PORFUN" || params[1] == "C2TESTCAM")
  
        var camera = "rtsp://192.168.16.19:554/Inter/Cameras/Stream?Camera="+params[1];
  
      else
  
        var camera = "http://192.168.16.19:8609/Inter/Cameras/GetStream?Camera="+params[1];
  
  
  
      // Write header
  
      resp.writeHead(200, {'Content-Type': 'video/ogg', 'Connection': 'keep-alive'});
  
  
  
      if (stdouts.hasOwnProperty(params[1]))
  
      {
  
        console.log("Getting stream already created for camera "+params[1]);
  
  
  
        var newStdout = Object.create(stdouts[params[1]]);
  
  
  
        newStdout.pipe(resp);
  
      }
  
      else
  
      {
  
          // Start ffmpeg
  
          var ffmpeg = child_process.spawn("ffmpeg",[
  
          "-i",camera,
  
          "-vcodec","libtheora",
  
          "-qscale:v","7",        // video quality
  
          "-f","ogg",             // File format
  
          "-g","1",               // GOP (Group Of Pictures) size
  
          "-"                     // Output to STDOUT
  
          ]);
  
  
  
          stdouts[params[1]] = ffmpeg.stdout;
  
  
  
          // Pipe the video output to the client response
  
          ffmpeg.stdout.pipe(resp);
  
  
  
      console.log("Initializing camera at "+camera);
  
      }
  
  
  
      // Kill the subprocesses when client disconnects
  
  /*
  
      resp.on("close",function(){
  
        ffmpegs[params[1]].kill();
  
        console.log("FIM!");
  
      });
  
  */
  
      break;
  
  }
  
  }
  
  else
  
  {
  
  resp.writeHeader(200, {"Content-Type": "text/html"});
  
  resp.write("WRONG CALL");
  
  resp.end();
  
  }
  
  n++;
  
  
  
  }).listen(8088);
  
  
  
  console.log('Server running at port 8088');

• pcm_dvd : consolidate pieces from pcm.c and mpeg.c

  30 août 2013, par Christian Schmidt

  pcm_dvd : consolidate pieces from pcm.c and mpeg.c
  Remove the header decoding for PCM audio from mpeg.c and the
  
  20/24bit parts from pcm.c and merge them into a new decoder in
  
  pcm-dvd.c.
  The decoder has added support for samples that span multiple
  
  packets and modified 20/24bit group decoding. Both is needed to
  
  decode samples that have been generated with DVD-Lab Pro 2. The
  
  decoding of 16bit PCM and two channel 24bit is identical to
  
  before. No other samples are known to verify the correctness of
  
  the encoding this software does.
  
  The complete list of tested formats is
  
  48kHz/16bit/2-8 channels
  
  48kHz/24bit/2-5 channels
  
  96kHz/16bit/2-4 channels
  
  96kHz/24bit/2 channels
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/pcm-dvd.c
  • [DH] libavcodec/pcm.c
  • [DH] libavcodec/version.h
  • [DH] libavformat/mpeg.c