If you wont mind, a film is orginaly done at 23.976 fps.
So, its nearly 24fps, and for PAL - there is not converison, the speed-up no-one recongizes, only audio is cripled (faster) - same as video.
But for NTSC, DVD rips are 30fps (29.970), and these are onyl computed added frames, so, they got removed, when guys making an DVD rip, so, the result is 99% of times 23.976fps movies - as orginaly made.
There is not point for this speed-up thingies.
Got it straight?
