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• Cutting a video without re encoding using ffmpeg and nodejs (fluent-ffmpeg)

  22 septembre 2020, par foufrix

  I have a quick question,
I'm trying to do a cloud video editor, and i want to be able to cut out video usng nodejs.

  


  I'm using fluent-ffmpeg. Here is my code :

  


  const cutVideo = async (sourcePath, outputPath, startTime, duration) => {
  console.log('start cut video');

  await new Promise((resolve, reject) => {
    ffmpeg(sourcePath)
      .setFfmpegPath(pathToFfmpeg)
      .setFfprobePath(ffprobe.path)
      .output(outputPath)
      .setStartTime(startTime)
      .setDuration(duration)
      .on('end', function (err) {
        if (!err) {
          console.log('conversion Done');
          resolve();
        }
      })
      .on('error', function (err) {
        console.log('error: ', err);
        reject(err);
      })
      .run();
  });
};


  


  It's working but not optimal, and as soon as i try to edit to a long video (getting 10 min from a video instead of 1 min out) it's super long.

  


  What i understand is that ffmpeg re encode everything, so that's why the longer the edit is the longer the process will.
Is there way to cut out using node-fluent-ffmpeg without re encoding everything ?

  


  Thanks to the community !

  


• Revision 4b57a8b356 : Add extended transforms for 32x32 and 64x64 Framework for alternate transforms

  17 juillet 2015, par Debargha Mukherjee

  Changed Paths :
   Modify /test/quantize_test.cc

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_entropy.h

  
   Modify /vp9/common/vp9_entropymode.c

  
   Modify /vp9/common/vp9_entropymode.h

  
   Modify /vp9/common/vp9_enums.h

  
   Modify /vp9/common/vp9_idct.c

  
   Modify /vp9/common/vp9_idct.h

  
   Modify /vp9/common/vp9_idwt.c

  
   Modify /vp9/common/vp9_idwt.h

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/common/vp9_scan.c

  
   Modify /vp9/common/vp9_scan.h

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_dwt.c

  
   Modify /vp9/encoder/vp9_dwt.h

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_encoder.c

  
   Modify /vp9/encoder/vp9_encoder.h

  
   Modify /vp9/encoder/vp9_rd.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Add extended transforms for 32x32 and 64x64

  Framework for alternate transforms for inter 32x32 and larger based
  on dwt-dct hybrid is implemented.
  Further experiments are to be condcuted with different
  variations of hybrid dct/dwt or plain dwt, as well as super-resolution
  mode.

  Change-Id : I9a2bf49ba317e7668002cf1499211d7da6fa14ad

• Does 'keyint infinite' improve overall compression with crf and mb-tree ?

  23 avril 2012, par HitomiTenshi

  After reading what intra-refresh does, I kinda got confused. I'm encoding for YouTube and YouTube will re-encode the video-file anyways, so I thought "why not removing all these heavy IDR-frames ?" I just want to compress my video as hard as possible, enabling everything that could help me getting a lower filesize, but still maintaining a high quality.

  I used to test around stuff with lossless QP encoding, but the only thing I could max out was the merange. Here is a paste of my x264 settings : Pastebin.

  I want to achieve highest compression while maintaining visually lossless quality. (using crf values around 10 - 13, and merange 32)

  Could anyone give me advice on how to compress my video super hard (without touching the crf value !). I also want to know if it's true, that keyint infinite reduces overall compression.