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ffmpeg_notes [2019-07-10 14:30] – created nikffmpeg_notes [2020-05-07 11:35] – nik
Line 11: Line 11:
 ''for file in `/bin/ls -1`; do ffmpeg -i $file -filter "setpts=6.0*PTS" -r 30 -an $file.30fps.mp4 ; done'' ''for file in `/bin/ls -1`; do ffmpeg -i $file -filter "setpts=6.0*PTS" -r 30 -an $file.30fps.mp4 ; done''
  
 +====video -> image sequence====
 +
 +...timelapsed (1 frame every 4 seconds)
 +
 +''ffmpeg -i IMG_4566.MOV -r 0.25 IMG_4566_seq/output_%05d.png''
 +
 +==== concat ====
 +
 +a list of files (e.g. named files.txt)\\
 +''file 'dust_and_shadow_28min.mp4' ''\\
 +''file 'dust_and_shadow_black.mp4' ''\\
 +
 +then...\\
 +''ffmpeg -f concat -i files.txt -c copy dust_and_shadow_30min.mp4''
 +
 +also -> https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg
  
 ====ffmpeg filters  ==== ====ffmpeg filters  ====
Line 128: Line 144:
 ''ffmpeg -i clip.mov -i clip2.mov  -filter_complex vstack merged.mov'' ''ffmpeg -i clip.mov -i clip2.mov  -filter_complex vstack merged.mov''
  
 +====extract audio from mp4====
 +
 +''ffmpeg -i input.mp4 -b:a 320K -vn output-audio.mp3''
  
 ====avoid audio/video reencode==== ====avoid audio/video reencode====
  • ffmpeg_notes.txt
  • Last modified: 2023-08-27 12:27
  • by nik