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• FFMPEG split audio files accurately

  5 mai 2015, par Jakob Hougaard Andersen

  I am trying to use ffmpeg to split uncompressed audio files. I would like to split them very precisely at certain points.
  My experiments so far have led me to this procedure :

  ffmpeg -ss 1.126 -i someInputFile.wav -acodec copy -t 0.634 someOutputFile.wav

  So I am seeking (-ss) to a certain point in the input file and then I am outputting to a file with a defined length (-t).

  The -ss parameter seems to locate the starting point very accurately, but the length of the file doesn’t seem to match my defined length exactly.
  It seems that the file size jumps in steps of 4096 bytes (and the length with it) so that I can not define a file length in between two steps.

  I know that 4096 bytes is not a lot, but for a mono wave file (44.1kHz, 16 bit) it equals a step size of approximately 45 ms. I would really like to be able to define the length as precisely as the starting point.

  So my question is : is it possible to avoid this 4096 byte quatization on the output file length ?

  I have tried to use the ’chomp’ bitstream filter, and it seems to make the length exactly what it should be, but it also causes the output audio file to have strange regions with pure noise...

  Best regards, Jakob

• Is there an elegant way to split a file by chapter using ffmpeg ?

  18 janvier, par Kattern

  In this page, Albert Armea share a code to split videos by chapter using ffmpeg. The code is straight forward, but not quite good-looking.

  


  ffmpeg -i "$SOURCE.$EXT" 2>&1 |
grep Chapter |
sed -E "s/ *Chapter #([0-9]+\.[0-9]+): start ([0-9]+\.[0-9]+), end ([0-9]+\.[0-9]+)/-i \"$SOURCE.$EXT\" -vcodec copy -acodec copy -ss \2 -to \3 \"$SOURCE-\1.$EXT\"/" |
xargs -n 11 ffmpeg


  


  Is there an elegant way to do this job ?

  


• Split video with ffmpeg with specific conditions

  15 juin 2023, par Mahdi

  I have some videos and I want to split them into 15 min each with FFmpeg with the following conditions :

  


  

  1. Final videos should be less than 15 min

  


  2. Script should cut the video somewhere that speaker is not talking. For example, script should cut video on the following point :

  


  


  

  


  And it should not cut videos like the following :


  


  This article could working for the first condition, but the second option is missed.

  


  python ffmpeg-split.py -f big_video_file.mp4 -s 10