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I am using FFMPEG to create timelapses from multiple images - sometimes several thousand images. I want to create an effect near the end of the timelapse where it slows down a few seconds before it reaches the end. I've heard this referred to as "easing." Sometimes it's done at the start of a timelapse, sometimes at the end. Right now I am using the following to create the timelapse:

ffmpeg -y -r %framerate% -f image2 -i %08d.jpg -b:v 16384 -vcodec mpeg4 -an -s "1920x1080" out.mp4

This works as expected at the constant %framerate% - but I wonder if anyone has ever worked out the ability to specify different framerates at specific points in the output movie...

I thought about encoding separate movies (probably 3 - Normal Timelapse, Slower, slowest) and then trying to concatenate them. I'm not sure if that's possible though.

Destek
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1 Answers1

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Ugly, but there may no better way: Duplicate the jpg's where it should be slower, and then -vsync 2 to not waste space.
E.g., if after frame 2000 it should be 3x slower, copy 2001.jpg to 2001b.jpg and 2001c.jpg, 2002.jpg to ..., ..., then renumber the jpg's so ffmpeg will be happy, then encode to mp4.

Camille Goudeseune
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