Preview & Final Render Choppy at transitions...

i searched for this on the forums, but couldn't find anything. i know it's probably a simple problem, but i can't figure it out:
whenever i overlap 2 or more clips to make a transitional fade (or even if i have 2 stacked clips on) the RAM preview is choppy at that part, and so is the final render when played back in both quicktime and WMP (i'm sure it's choppy in every player, those are the only 2 i've tried).
the video in both RAM preview and final render is smooth up until a transition, then it's choppy and crawls through it, then smooth again.
am i not checking some small box somewhere? anyone else have this problem and fix it?
TECH SPECS:
AE CS4
30fps
intel 2.49 GHz, 3 GB RAM
Windows XP Pro

Well, most MPG in digital photo cameras is some sort of MPEG-4, often deviating considerably from standardized specs, so anything is possible. In your case, a look in the manual might offer some insights. I'm beggining to think that the clips are actually recorded at a lower frame rate (e.g. 24fps) and then use some sort of pulldown to look like 30fps. that#s not noticable when just viewing them, but gets you when editing. they may require to have the pulldown removed by interpreting them as 24fps pa. likewise, 30fps and 29.97fps are different things in AE's world, so that should be checked as well. Those discrepancies could also well explain your audio issues. The scaling should be unrealted, as AE works on fully reconstructed frames, not the source stream. It just cannot reconstruct the frames correctly in the transition areas, that's why it looks so weird.
Mylenium

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