How to find the frames-per-second of a Quicktime movie using Applescript?

Is there a way to find out the real-time "frames per second" of a Quicktime movie?
The only Applescript movie properties in Quicktime which I have found to be useful are "duration" and "time scale". The real-time duration of the movie in seconds is found by dividing "duration" by "time scale".
But "time scale" only sometimes relates to any real time property. In some cases it does (2500 = PAL 25 fps, 2997 = NTSC 29.97 fps) but for many other movie types I've opened (DivX, flv, mp4 etc) the "time scale" is often reported as "600" even though the Quicktime movie inspector window will report a frame rate of 25, 29.97, 15 or some other number.
Where does the Quicktime movie inspector window extract the FPS from, and is it possible to extract that same number, or calculate the real-time FPS of a Quicktime movie using Applescript only?
Thanks.

Thanks for this but unfortunately it only works for some movie types. For .dv .flv and .divx movies, this script correctly calculates the FPS. But for .mpg .mp4 and .m4v it does not.
For .mpg movies I tested, the count of frames was always 1, so clearly the FPS calculation is always wrong.
For the .mp4 and .m4v movies I tried, the FPS was always reported as 43, regardless of whether the actual FPS was 25 or 29.97. In all cases the count of frames was incorrect.
A bug in Quicktime?

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How to find the frames-per-second of a Quicktime movie using Applescript?

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