Thank you very much for the answer!
I also noticed that Cut video option sometimes doesn't "track" the right amount of frames, and, for example, from frame 50 to 200 I usually get over 200 PNGs. Does this depend on the desired FPS multiplier?
It'll be great, when you implement this Perfect Loop function with Cut video option in mind as well. Would it be possible to also implement visual selection of the cutting range? ^_^