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I want to create seamless loops with FFMPEG but am unsure of the right way of approaching it.

If I can pseudocode it out for y'all would someone be able to help me with the correct invocation?

ffmpeg -i input.mp4 --get-midway-point --put-second-half-of-film-first --put-first-half-of-film-second --overlap-part1-and-part2-by-n-milliseconds ---transition-transparency-from-100-to-0-over-n-milliseconds -o output.mp4

I'm sort of presuming that it's possible but I'm really stumped.

Giacomo1968
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Pete
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  • Currently this requires scripting, so answer depends on your OS or preferred scripting language. Or wait for the pending crossfade filter patch to get applied and it will make things easier. – llogan Oct 28 '19 at 18:29
  • Aha, great. So I should break it down into each task and make a shell script or python script then.

    Thanks for answering, I'll be sure to report back if I get it worked out.

     – Pete Nov 01 '19 at 14:44
  • @llogan Please post your comment as an answer. – Giacomo1968 Nov 01 '19 at 14:52
  • @JakeGould Sure, but I was waiting for the OP to tell me the OS so I could possibly come up with a turnkey answer. – llogan Nov 01 '19 at 16:46
  • @llogan You should just post an answer and edit for the OS specifics after that is clarified. Take credit! – Giacomo1968 Nov 01 '19 at 18:42

1 Answers1

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This needs to be scripted, but I'm unsure of your OS/shell/scripting language so I can't give you a turnkey answer to copy and paste. Here are the basic steps:

  1. Get duration of input.

  2. Divide the result in half. Example using bc.

  3. Create segments with (a)trim filters.

  4. Crossfade

llogan
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