Did you ever get this resolved? There is so much misinformation floating about and muddying the situation.
the NUMBER ONE thing for Canon Vixia/MacOS clients that ought to be pointed out is the
CONNECTION & LAUNCH ORDER of the camera and software. --I only discovered this after the dizzying ordeal of searching (I want to re-import vids) I went to the Canon site and downloaded their transfer utility.
Upon reading Transfer Utility's instructions a couple of key steps became clear:
1: have camera TURNED ON (BUT UNCONNECTED) IN AVCHD PLAYBACK MODE
2: LAUNCH TRANSFER UTILITY
3: assuming you have already got the usb cable plugged into your Mac -plug it into the camera.
et voila!! this presupposes you've already got the a/c adapter plugged into the camera -Canon is specific about using it during transfer -whether that's a precaution or if it affects the way the camera operates I cannot say. I know 4sure that avchd containers can be irretrievably damaged if interrupted during transfer -even if it's just the battery running out of power because you need the entire hidden file structure contained within the .mts folders.
When I plugged my camera onto the usb cable "Photos" instantly launched and gave me the option to import previously imported video. I have not as yet tried it with iMovie but I suspect that will be the same. At any rate I AM NOT IMPORTING TO PHOTOS but using Pixela/Canon Transfer Utility to put them into my movie folder in full glorious original format.
Hope this saves others from similar frustration.
"WHY" don't the users write the instructions ...I swear with some of these systems and app (Dropbox was the latest) people writing directions have a very narrow view and ignore similarities and differences across multiple platforms .
Cheers "WE DIDN'T GET UP TODAY TO GO WITHOUT!!" xoxo 🙂