1105 Views 1 Reply Latest reply: Oct 16, 2009 3:42 PM by rastriffler
OK, I have a bit more data, and some success!
Using Handbrake I converted the original mov files to mpeg-4 files using the ffmpeg codec rather than the H.264, then imported them as events in iMovie. This time they imported quickly, were responsive when edited, and shared to iDVD quickly, completing in under an hour.
So it would seem that it is the H.264 format that does not play well with iMovie. Still curious if anyone has any suggestions/explanations as to why that may be, but at least for now the problem is resolved.