Comment by Tempest1981

1 month ago

One that older AI struggled with was the "bounce" effect: play from 0:00 to 0:03, then backwards from 0:03 to 0:00, then repeat 5 times.

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Tempest1981

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geysersam  1 month ago

Just tried it and got this, is it correct?

> Write an ffmpeg command that implements the "bounce" effect: play from 0:00 to 0:03, then backwards from 0:03 to 0:00, then repeat 5 times.

  ffmpeg -i input.mp4 \
  -filter_complex "
  [0:v]trim=0:3,setpts=PTS-STARTPTS[f];
  [f]reverse[r];
  [f][r]concat=n=2:v=1:a=0[b];
  [b]loop=loop=4:size=150:start=0
  " \
  output.mp4

  • Tempest1981  1 month ago

    Thanks, but no luck. I tested it on a 3 second video, and got a 6 second video. I.e. it bounced 1 time, not 5 times.

    Maybe this should be an AI reasoning test.

    Here is what eventually worked, iirc (10 bounces):

      ffmpeg -i input.mkv -filter_complex "split=2[fwd][rev_in]; [rev_in]reverse[rev]; [fwd][rev]concat=n=2,split=10[p1][p2][p3][p4][p5][p6][p7][p8][p9][p10]; [p1][p2][p3][p4][p5][p6][p7][p8][p9][p10]concat=n=10[outv]" -map "[outv]" -an output.mkv