Yes, you are correct. You could drop your 30p (which I presume is really 29.97 fps) into a 24p (really: 23.976 comp), then Add Twixtor and set Twixtor's Input: Frame Rate to 29.97. Then you can have AE render-out 29.97 footage with pulldown to get the "film look."
However, that introduces a world of studder, and opens you up to having artifacts (Twixtor will undoubtedly have some artifacts, like every other retiming software out there). I would instead simply add motion blur using ReelSmart Motion Blur to compensate for the difference in shutter speeds between video and film. Of course, many people think you must go to 24p to get the "film look", and I disagree.
You can read more about our suggestions here:
http://www.revisionfx.com/support/faqs/generalfaqs/video_like_film/ The solution I propose is in step 4 (you can ignore the part that describes deinterlacing the footage since you already have 30p footage).
Cheers,
pete Litwinowicz
RE:Vision Effects, Inc.
