[Macgregor Thomson]

I should also add that transitions are not as smooth for the obvious reason that you are going from 30fps to 24fps.

[Macgregor Thomson]

Gabriele,
If you’re footage is already edited, you might try a solution that I’ve had success with. Export the sequence as a Quicktime Reference then run it through compressor with the ProRes codec, except in the settings turn frame controls on, and in the de-interlace pulldown select Reverse Telecine.
Compressor automatically detects broken cadence so the process works even with already edited footage. This works for me, as I am often handed footage from the DVX100 shot in 24p (non-advanced) that has already been digitized. I edit the footage in a 29.97 timeline then follow the process that I described above. Cuts down dramatically on waiting time since you are only reverse telecine’ing your edited sequence (not all footage).

Only snag is I’m not sure how well it would work with a sequence with heavy effects or motion compositing, Probably not at all. Otherwise, hope this helps,
MacGregor Thomson