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• 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');

• 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.

• convert yuv to mp4 by ffmpeg on android

  10 août 2013, par worldask

  i have to convert yuv to mp4 by ffmpeg on android. When I convert wav to mp4 it works well. but when i convert yuv or yuv + wav to mp4, i got errer message said

  Error decoding AAC frame header

  anybody knows what happened ?

  following is the full debug log

  transferYUV2MP4() enter
  
  __transfer_yuv_to_mp4() enter
  
  __transfer_yuv_to_mp4() argv[00/17] = ffmpeg
  
  __transfer_yuv_to_mp4() argv[01/17] = -loglevel
  
  __transfer_yuv_to_mp4() argv[02/17] = debug
  
  __transfer_yuv_to_mp4() argv[03/17] = -y
  
  __transfer_yuv_to_mp4() argv[04/17] = -i
  
  __transfer_yuv_to_mp4() argv[05/17] = /sdcard/111.yuv
  
  __transfer_yuv_to_mp4() argv[06/17] = -i
  
  __transfer_yuv_to_mp4() argv[07/17] = /sdcard/3.wav
  
  __transfer_yuv_to_mp4() argv[08/17] = -c:a
  
  __transfer_yuv_to_mp4() argv[09/17] = aac
  
  __transfer_yuv_to_mp4() argv[10/17] = -strict
  
  __transfer_yuv_to_mp4() argv[11/17] = experimental
  
  __transfer_yuv_to_mp4() argv[12/17] = -b:a
  
  __transfer_yuv_to_mp4() argv[13/17] = 56k
  
  __transfer_yuv_to_mp4() argv[14/17] = -preset
  
  __transfer_yuv_to_mp4() argv[15/17] = ultrafast
  
  __transfer_yuv_to_mp4() argv[16/17] = /sdcard/111.mp4
  
  __run_ffmpeg_main() enter
  
  __run_ffmpeg_main() handle=0xb000f7f8
  
  __run_ffmpeg_main() dlfunc=0x4b5a2728
  
  ffmpeg version 1.2.2
  
   Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 10 2013 16:34:45 with gcc 4.6 (GCC) 20120106 (prerelease)
  
    configuration: --target-os=linux --prefix=./android/armv7-a --sysroot=/Users/pht/android/ndks/android-ndk-r9/platforms/android-8/arch-arm/ --enable-gpl --enable-version3 --disable-shared --enable-static --disable-ffprobe --disable-ffplay --disable-ffserver --disable-network --enable-avformat --enable-avcodec --enable-cross-compile --arch=arm --cc=/Users/pht/android-standalone-toolchain/bin/arm-linux-androideabi-gcc --nm=/Users/pht/android-standalone-toolchain/bin/arm-linux-androideabi-nm --cross-prefix=/Users/pht/android-standalone-toolchain/bin/arm-linux-androideabi- --extra-cflags=' -I../fdk-aac/include -I../x264 -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a ' --extra-ldflags=' -L../fdk-aac/lib -L../x264 -Wl,-rpath-link=/Users/pht/android/ndks/android-ndk-r9/platforms/android-8/arch-arm//usr/lib -L/Users/pht/android/ndks/android-ndk-r9/platforms/andr
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Splitting the commandline.
  
  Reading option '-loglevel' ...
  
   matched as option 'loglevel' (set libav* logging level) with argument 'debug'.
  
  Reading option '-y' ...
  
   matched as option 'y' (overwrite output files) with argument '1'.
  
  Reading option '-i' ...
  
   matched as input file with argument '/sdcard/111.yuv'.
  
  Reading option '-i' ...
  
   matched as input file with argument '/sdcard/3.wav'.
  
  Reading option '-c:a' ...
  
   matched as option 'c' (codec name) with argument 'aac'.
  
  Reading option '-strict' ...
  
   matched as AVOption 'strict' with argument 'experimental'.
  
  Reading option '-b:a' ...
  
   matched as option 'b' (video bitrate (please use -b:v)) with argument '56k'.
  
  Reading option '-preset' ...
  
   matched as AVOption 'preset' with argument 'ultrafast'.
  
  Reading option '/sdcard/111.mp4' ...
  
   matched as output file.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option loglevel (set libav* logging level) with argument debug.
  
  Applying option y (overwrite output files) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file /sdcard/111.yuv.
  
  Successfully parsed a group of options.
  
  Opening an input file: /sdcard/111.yuv.
  
  Format aac detected only with low score of 1, misdetection possible!
  
  File position before avformat_find_stream_info() is 0
  
  get_buffer() failed
  
  Error decoding AAC frame header.
  
  channel element 2.12 is not allocated
  
  More than one AAC RDB per ADTS frame is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
  
  channel element 3.4 is not allocated
  
  channel element 2.2 is not allocated
  
  Number of scalefactor bands in group (44) exceeds limit (40).
  
  channel element 2.10 is not allocated
  
  channel element 1.15 is not allocated
  
  channel element 3.6 is not allocated
  
  channel element 2.0 is not allocated
  
  channel element 3.3 is not allocated
  
  Sample rate index in program config element does not match the sample rate index configured by the container.
  
  channel element 2.8 is not allocated
  
  Sample rate index in program config element does not match the sample rate index configured by the container.
  
  channel element 3.2 is not allocated
  
  Reserved bit set.
  
  channel element 2.6 is not allocated
  
  channel element 2.1 is not allocated
  
  Dependent coupling is not supported together with LTP
  
  Dependent coupling is not supported together with LTP
  
  Dependent coupling is not supported together with LTP
  
  Dependent coupling is not supported together with LTP
  
  Dependent coupling is not supported together with LTP

  and the "Dependent coupling..." line loops thousands of times