ffmpeg minterpolated slomo

https://ffmpeg.org/ffmpeg-filters.html#minterpolate

minterpolate
Convert the video to specified frame rate using motion interpolation.

Example, assuming input and output are 25 fps

ffmpeg -i in.mov -vf minterpolate=fps=50 -c:v prores -r 25 out.mov # < that didn't work

ffmpeg -i in.mov -t 1 -vf minterpolate=fps=150 -f nut -c:v rawvideo - | ffmpeg -r 25 -i - -c:v prores out.mov # this is very ugly, but working (25fps > 25fps)
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