video - ffmpeg -r / fps over time? -

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ok - going round in circles here welcome...

using ffmpeg generate frames movie. want limit total frames 10 per movie.

so im trying figure out -r (fps) use in code.

so if video 10secs long want 10 files -r 1 fps.

but if video 100 secs long , want 10 files th -r should 0.1 fps.

i can't seem figure out formula?!

please help!

ok r = frameswanted / totalseconds


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