Damaged frames after video export

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Hi,

I'm facing the very same problem in iMovie. First I thought it has something to do with the transitions or the source videos, so I tried to delete them and put them back in the project, but the graphic issues remain or occur on different frames. I spent a couple of days now to somehow fix it, but in the end there were still those glitches, also in the exported files.

I see the glitches in the preview as well, but when I skim back a little and replay the same frames, it's gone. It reoccurs though, when I skim to a different part of the video and go back then to the problematic part.

Today I loaded older projects into the timeline and saw the same problems on those projects which worked totally fine before without errors, so I assume it is a Catalina problem.

Some details:

• iMovie 10.1.13
• Videos taken with iPhone XS, 1080p, 60p
• all source videos were imported to Apple Photos
• no problems (glitches) anywhere else when playing those videos (Photos itself or playing from finder)
• Video project is 4k / 30p, around 14 min.
• I get around 10-12 pixel errors in the project, so it's practically useless

Anyone with the same issues or fixes?

Thx, Roman