It was working before 12.2 for me and I haven't changed anything.
I was able to import video from my Sony Handycam into iMovie using a Firewire cable on my Mac Mini M1. After update to 12.3, I tried to import a tape today the camera doesn't show up in iMovie anymore.
Mac mini, macOS 12.3
You can re-install Big Sur on your Mac fairly easily without removing Monterey.
Create a new partition (volume) on your Mac using Disk Utility and install Big Sur on that.
You then open your Mac using the new partition.
Installing macOS on a separate APFS volume - Apple Support
How to get old versions of macOS – Apple Support (UK)
Eventually if you want to remove the new partition . . .
Add, delete or erase APFS volumes in Disk Utility on Mac – Apple Support (UK)
Creating a new partition takes only a minute or so . . . installing Big Sur will take longer of course.
Back up any important data first.
Same issue here: I have been using iMovie 10.3.1 on a 2020 M1 13" MacBook Pro to import DV footage from a Canon MV700 with no problems (4 pin to 6 pin FireWire cable > FireWire 400 to 800 adapter > Apple FireWire 800 to Thunderbolt adapter > Thunderbolt to Thunderbolt 3 > Mac) using Big Sur. As soon as I updated to Monterey, I can confirm the camcorder no longer displays in iMovie's import window.
I have the same issue with my Canon MV550i.
To copy my family videos from tape to the cloud, was the main reason I recently bought my MacBook Air. I had copied two tapes and now this has happened.
It is very frustrating.
So I have have a new MacBook Pro and a Sony trv20 camera which takes a fire wire. I just went out and dropped another 100 bucks in adapters and connected to iMovie. its showing my cam but its not playing. am I doing something wrong or is this the issue everyone is now having after installing iMovie?
yes I did before update to 12.3
How to revert to previous version?
Thanks
Makes me glad that I saved my old G4 PowerBook.
-- Rich
Same issue with me – since upgrading to Monterey, iMovie no longer recognizes my Sony miniDV camcorder
DV device isn't recognized in iMovie at Last version OS
