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• How to apply complex filters more than once with different parameters while avoiding "too many inputs" errors in ffmpeg ?

  15 mai 2019, par Hugh Walxet

  I’m trying to apply the displace complex filter more than once in a video, at specific intervals with no proportional relationship. In each instance, I want to apply the displace filter with slightly different parameters. If I list it twice in the commands for the complex_filter, I get an error saying I have too many inputs.

  I might as well ask, separately, how I could apply the same filter with the same parameters more than once in a video, without re-iterating the same filter more than once in the command line. Put differently, how do I run a filter as specific times without writing the command several times sequentially, each with a different trigger time ?

  C :\Users\Me>ffmpeg -i c :\users\Me\desktop\house2.mp4 -i c :\users\Me\desktop\house3.mp4 -i c:users\Me\desktop\house4.mp4 -filter_complex "shuffleframes=enable=’between(t,21,27)’:mapping=0 9 2 1 10 5 8 6 7 4 3, shuffleframes=enable=’between(t,3,7)’:mapping=0 4 9 1 10 5 8 6 2 7 4 3, shuffleframes=enable=’between(t,15,19)’:mapping=0 6 2 1 10 5 8 3 7 4 9, [0][1][2] displace=enable=’between(t,9,10)’:edge=wrap, [0][1][2] displace=enable=’between(t,20,21)’:edge=smear" c :\users\Me\desktop\houseglitch.mp4

• How to generate only 10 thumbnails irrespective of video duration with ffmpeg

  15 août 2022, par EaBengaluru

  Hi i want to generate only 10 thumbnails irrespective of video duration with ffmpeg

  


  I have followed this thread Create multiple thumbnails from a video at equal times / intervals

  


  here is the command i'm using

  


  ffmpeg -i input.mp4 -vf "select='not(mod(t,60/12))'" -vsync vfr output_%04d.jpg


  


  for 14.4 duration video it is generating only 3 thumbnails , i want always 10 with equal interval.

  


  For example if i have 120 duration video i must get thumbnails at

  


  [0 or 12, 24,36,48,60,72,84,96,108,120]


  


  Question : i want to generate always 10 thumbnails with equal interval as shown in example for duration of 120

  


• Run ffmpeg once but get multiple screenshots

  9 novembre 2017, par user779159

  I get a screenshot from a remote video file using ffmpeg with a command like ffmpeg -ss $TIME -i $URL -frames:v 1 -filter:v $FILTER file.jpg (-ss comes before -i for fast seeking https://trac.ffmpeg.org/wiki/Seeking). $FILTER is how I want to transform the screenshot, like cropping/resizing. In this case it’s "crop=iw-5:ih-5, scale=100:100:force_original_aspect_ratio=increase, crop=100:100")

  If I want to get 3 screenshots, at 3 seconds, 5 seconds, and 14 seconds, I need to run this command 3 separate times, passing 3, 5, and 14 as $TIME. But is it possible to run the command once but have it output multiple screenshot files for the different times ?

  And would ffmpeg do that in a way where it would make the round-trip remote request just 1 time instead of 3 ? In that case it would be more efficient. If not, then maybe it’s better to make the 3 requests separately since I could do it in parallel.