Am Mo., 23. Sept. 2019 um 23:04 Uhr schrieb Michael Koch
<astroelectro...@t-online.de>:

> ffmpeg -f lavfi -i testsrc2=size=vga:duration=10:rate=20 -lavfi
> "setpts='(20-sqrt(400-2*N))/TB' " -y out.mp4

(Does this syntax really work?)

As said before, our mp4 muxer does not (correctly) support
constant frame rate.

Carl Eugen
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