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• Merge remote-tracking branch ’cehoyos/master’

  7 mai 2015, par Michael Niedermayer

  Merge remote-tracking branch ’cehoyos/master’
  * cehoyos/master :
  
    lavf/img2dec : Autodetect qdraw images.
  
    lavc/qdrw : Also support real-world qdraw images.
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/qdrw.c
  • [DH] libavcodec/version.h
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/img2dec.c
  • [DH] libavformat/version.h

• mdct15 : add inverse transform postrotation SIMD

  29 juillet 2017, par Rostislav Pehlivanov

  mdct15 : add inverse transform postrotation SIMD
  2.5ms frames :
  
  Before   (c) :  2638 decicycles in postrotate, 2097040 runs,    112 skips
  
  After (sse3) :  1467 decicycles in postrotate, 2097083 runs,     69 skips
  
  After (avx2) :  1244 decicycles in postrotate, 2097085 runs,     67 skips
  5ms frames :
  
  Before   (c) :  4987 decicycles in postrotate, 1048371 runs,    205 skips
  
  After (sse3) :  2644 decicycles in postrotate, 1048509 runs,     67 skips
  
  After (avx2) :  2031 decicycles in postrotate, 1048523 runs,     53 skips
  10ms frames :
  
  Before   (c) :  9153 decicycles in postrotate,  523575 runs,    713 skips
  
  After (sse3) :  5110 decicycles in postrotate,  523726 runs,    562 skips
  
  After (avx2) :  3738 decicycles in postrotate,  524223 runs,     65 skips
  20ms frames :
  
  Before   (c) : 17857 decicycles in postrotate,  261866 runs,    278 skips
  
  After (sse3) : 10041 decicycles in postrotate,  261746 runs,    398 skips
  
  After (avx2) :  7050 decicycles in postrotate,  262116 runs,     28 skips
  Improves total decoding performance for real world content by 9% with avx2.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/mdct15.c
  • [DH] libavcodec/mdct15.h
  • [DH] libavcodec/x86/mdct15.asm
  • [DH] libavcodec/x86/mdct15_init.c

• Ffmpeg set duration using node-fluent-ffmpeg

  23 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.
  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 !