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• FFMEPG Audio Encoding, How to get optional frame_size of the CodecContext and get right ouput

  23 octobre 2014, par 程栋彬

  I’m trying to encode pcm format audio using ffmpeg, because the pcm data is of FLTP format, I use audio codec AV_CODEC_ID_AC3 or AV_CODEC_ID_MP3, when I use avcodec_open2(pCodecCtx,pCodec), the pCodecCtx->frame_size was set by this function, for example, it is set as 1536. But the pcm data I get was saved by frame_size = 512. I don’t to do the data transfer, so I just change pCodecCtx->frame_size to 512 after avcodec_open2(), but the output encoded audio sounds wrong.

  So how to encode audio with optional frame_size when the input is pcm data saved in FLTP format ?

• Merge commit ’74b02377980321934e33969c84733ace7e9f4eeb’

  15 octobre 2014, par Michael Niedermayer

  Merge commit ’74b02377980321934e33969c84733ace7e9f4eeb’
  * commit ’74b02377980321934e33969c84733ace7e9f4eeb’ :
  
    mov : Correctly check the color transfer characteristics range
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/mov.c

• Ffmpeg send duration of video to client (using node-fluent-ffmpeg)

  26 mai 2013, par Vprnl

  I'm really new to the world of ffmpeg so please excuses me if this is a stupid queston.

  I'm using the module Node-fluent-ffmpeg to stream a movie and convert it from avi to webm with FFMPEG.

  So far so good (it plays the video), but I'm having trouble parsing the duration to the player. It also gives me an error even though I plays the video.

  my code is as followed :

  var stat = fs.statSync(movie);
  
  
  
  var start = 0;
  
  var end = 0;
  
  var range = req.header('Range');
  
  if (range != null) {
  
  start = parseInt(range.slice(range.indexOf('bytes=')+6,
  
    range.indexOf('-')));
  
  end = parseInt(range.slice(range.indexOf('-')+1,
  
    range.length));
  
  }
  
  if (isNaN(end) || end == 0) end = stat.size-1;
  
  if (start > end) return;
  
  
  
  var duration = (end / 1024) * 8 / 1024;
  
  
  
  res.writeHead(206, { // NOTE: a partial http response
  
      'Connection':'close',
  
      'Content-Type':'video/webm',
  
      'Content-Length':end - start,
  
      'Content-Range':'bytes '+start+'-'+end+'/'+stat.size,
  
      'Transfer-Encoding':'chunked'
  
  });
  
  
  
  var proc = new ffmpeg({ source: movie, nolog: true, priority: 1, timeout:15000})
  
      .toFormat('webm')
  
      .addOptions(['-probesize 900000', '-analyzeduration 0', '-minrate 1024k', '-maxrate 1024k', '-bufsize 1835k', '-t '+duration+' -ss'])
  
      .writeToStream(res, function(retcode, error){
  
      if (!error){
  
          console.log('file has been converted succesfully',retcode);
  
      }else{
  
          console.log('file conversion error',error);
  
      }
  
  });

  I set the header with a start and a end based on this article : http://delog.wordpress.com/2011/04/25/stream-webm-file-to-chrome-using-node-js/

  I calculate the length in seconds in the variable duration.

  The error FFmpeg is giving me is :

      file conversion error ffmpeg version N-52458-gaa96439 Copyright (c) 2000-2013 the FFmpeg developers
  
        built on Apr 24 2013 22:19:32 with gcc 4.8.0 (GCC)
  
        configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --e
  
      nable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable
  
      -libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --ena
  
      ble-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwola
  
      me --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enabl
  
      e-libxvid --enable-zlib
  
        libavutil      52. 27.101 / 52. 27.101
  
        libavcodec     55.  6.100 / 55.  6.100
  
        libavformat    55.  3.100 / 55.  3.100
  
        libavdevice    55.  0.100 / 55.  0.100
  
        libavfilter     3. 60.101 /  3. 60.101
  
        libswscale      2.  2.100 /  2.  2.100
  
        libswresample   0. 17.102 /  0. 17.102
  
        libpostproc    52.  3.100 / 52.  3.100
  
      Input #0, avi, from 'C:/temp/test.avi':
  
        Metadata:
  
          encoder         : Nandub v1.0rc2
  
        Duration: 00:01:09.78, start: 0.000000, bitrate: 1517 kb/s
  
          Stream #0:0: Video: msmpeg4v3 (DIV3 / 0x33564944), yuv420p, 640x352, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
          Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 222 kb/s
  
      [libvpx @ 0036db20] v1.2.0
  
      Output #0, webm, to 'pipe:1':
  
        Metadata:
  
          encoder         : Lavf55.3.100
  
          Stream #0:0: Video: vp8, yuv420p, 640x352, q=-1--1, 200 kb/s, 1k tbn, 23.98 tbc
  
          Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (msmpeg4 -> libvpx)
  
        Stream #0:1 -> #0:1 (mp3 -> libvorbis)

  The client side player (which is VideoJs) says the file is infinite/NaN in length.

  I feel like I'm pretty close to a solution but my inexperience with the subject matter prohibits me from getting it to work. If I'm unclear in any way please let me know. (I have a tendency of explaining things fuzzy.)

  Thanks in advance !

  [EDIT]

  I removed the duration bit because it has nothing to do with the issue. I checked the response header of the client and saw :

   Accept-Ranges:bytes
  
   Connection:keep-alive
  
   Content-Length:13232127
  
   Content-Range:bytes 0-13232127/13232128
  
   Content-Type:video/webm

  Why can't the client figure out the duration even though it receives it in the header ?