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What do you mean by motion detection? Scene changes?

But whatever you mean, the answer is probably VapourSynth. In fact, you can probably do whatever you are trying to do inside VapourSynth instead of ffmpeg.

If you mean scene changes, this library works: https://github.com/Breakthrough/PySceneDetect

https://github.com/roboflow/supervision

How about https://opencv.org/ ?

If you mean scene change detecting, LosslessCut can do that (wrapper around ffmpeg filters)

What would you like ffmpeg to do with the timestamps, extract them?