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

    26 May 2013, by 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?

  • Ffmpeg set duration using node-fluent-ffmpeg

    23 May 2013, by 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.
    So far so good (it plays the video), but I'm having trouble parsing the duration to the player. My ultimate goal is to be able to skip ahead in the movie. But first the player needs to know how long the video is.

    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;
    

    
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')
    
    .withVideoBitrate('1024k')
    
    .addOptions(['-probesize 900000', '-analyzeduration 0', '-bufsize 14000'])
    
    .writeToStream(res, function(retcode, error){
    
    if (!error){
    
        console.log('file has been converted succesfully',retcode);
    
    }else{
    
        console.log('file conversion error',error);
    
    }
    
});

    I tried to 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 also looked in the FFmpeg documentation and found -f duration and -ss.
    But I don't quite know how to convert the byte range to seconds.

    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!

  • Merge commit 'bd6496fa07e32fd09ceb79404f9af43df959bcb2'

    5 May 2017, by Clément Bœsch
    Merge commit 'bd6496fa07e32fd09ceb79404f9af43df959bcb2'

    * commit 'bd6496fa07e32fd09ceb79404f9af43df959bcb2':
    
  interplayvideo: Convert to the new bitstream reader
    
  adx: Convert to the new bitstream reader
    
  dvbsubdec: Convert to the new bitstream reader
    
  motionpixels: Convert to the new bitstream reader
    

    This merge is a noop, see
    
http://ffmpeg.org/pipermail/ffmpeg-devel/2017-April/209609.html
    

    Merged-by: Clément Bœsch <u@pkh.me>

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