QuickTime Movie Frame Rate Conforming

Hello, I’ve been lurking here for a long time now so here’s my first question, which I think may not actually be possible with Applescript and QuickTime Player 7 / X !

There are tools such as “Cinema Tools” from Final Cut Studio, “QtChange”, “Lossless Frame Rate Converter” etc

They allow you to conform the frames of the movie to a new Frame Rate. My understanding is that this process affects the header of the mov, NOT the duration/time of each frame and not the duration of a track/movie (track/movie duration is read only in AS)

Does anyone have any experience with this? Is it only possible using QtKit or AVFoundation?