Stuttery playback in FC only

new 27inch iMac with 8gigs ram. Video from Canon 5dmkii. Full quality video plays full screen in quicktime with no problems. Viewed from within FC though motion has a strobed jittery look. Any ideas why?
Cheers

Were you aware that FCE doesn't work with h.264 natively? Convert the files to AIC prior to importing them into your project. Check the FCE user's manual for details on which codecs work.
-DH

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