Although you may see some stuttering if you preview in the import window, the video should play back correctly once it is imported into iMovie.
iMovie '09: Sony Webbie footage stutters during import preview
When previewing video footage in the import window of iMovie '09 from a Sony Webbie HD (MHS-CM1 or MHS-PM1) camcorder, the video footage may appear to stutter or skip.
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