i want to know mecanism of 'Assume this frame rate' function.

i had some test for video convert(24 to 2398 and inverse) and i figure out very strong function.

that is Modify - Interpret Footage in Project Pannel. in there, you can 'Assume This Frame Rate' to Frame Rate modify. this function available to convert frame rate 23.98FPS from 24FPS or inverse, perfectly. perfectly means ; without frame loss or involuntary freeze frame.

how can work this function? 

for example, i put the 24FPS footage in 24FPS timeline sequence and export as 23.98FPS and then i get unwanted frame loss(probably 1 frame per 1000 frame) result.

BUT, i had interpret(modify - Assume This Frame Rate) source footage 24FPS to 23.98FPS before put on timeline sequence, and make 23.98FPS Timeline sequece and put the footage on the sequence and export as 23.98FPS. and then i get perfect footage no frame loss or freeze frame.

how it work “modify - Assume This Frame Rate” ? i know it is definitely different between 23.98FPS and 24FPS. they different total running time(duration, timecode-frame number).

but MAGICAL function that Assume This Frame Rate could convert perfectly between 23.98FPS 24FPS. modified and result footages can share exactly same timecode and total duration.

in want to know, how it “Assume This Frame Rate” works.