To resolve this issue, import footage from your Canon 5D Mark II in large format (960x540) instead of full-size format.
iMovie '09: Canon 5D Mark II may cause iMovie to unexpectedly quit
Footage imported into iMovie '09 in full-size format from a Canon 5D Mark II may cause iMovie '09 to unexpectedly quit. This may occur when scrubbing through the imported clips in a project or in the event library.
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