Random HDV clips choppy

Hi gang,
I'm editing HDV clips (1440x1080/25p) on a MBP with 4gig ram and FW800 drives.
Now, opening the clips in the viewer and playing them back is generally fine, I've done a fair amount of HDV (and ProRes) stuff on this MBP and it can handle it fine.
However - occasionally some clips will playback choppily, and watching the CPU meter rise the computer is obviously struggling playing the clips back. It's always the same clips, in other words, ones that are affected stay affected, all the other clips are fine. This is about, what, 5 clips in 500 odd.
Why would most HDV clips play fine, and some seem to require a lot of grunt to playback? Is it to do with edit points causing the HDV compression to require CPU intervention?
And most importantly, is there anything I can do about it? it's not the end of the world, as I can drop them into the timeline and render, but it's bugging me...
Edit: Ok, this is interesting. The affected clip is actually according to FCP an HDV 1080i50 clip. However, the data rate is consistent with my 25p footage and not the other 50i footage, and more importantly, looking at the footage at 100%, it is not interlaced at all.
So it would seem that FCP has incorrectly interpreted this footage on ingest as 50i when it is actually 25p - and presumably because of this is having to do some CPU mojo to play it back, resulting in choppy video.
Any thoughts?

Oh well - I used Compressor to pretend that the footage was progressive, then converted it out to ProRes and that has done the job - and it's what I will do if/when this situation happens again.

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Sent from my iPhone
Phil Mariasy
Allied Media Group
[email protected]
419-297-2730
151 N. Michigan
Ste. 300
Toledo, OH 43604

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Random HDV clips choppy

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