Or, you can find out and delete the corrupted files. Redundancy in file management is excellent if you need to work with complex files. To avoid this, ensure that you have various copies of the file. It might not be possible to use a different file all the time. It is a common thing that the file you are trying to work with is a corrupted one and won’t play. Here are the most straightforward solutions to the problem.

I can't imagine why it would change anything for iMovie, but nothing else changed.It is common that iMovie keeps freezing while importing any file, or iMovie keeps quitting unexpectedly while getting started with a new project. I had to use the MobileDeviceUpdater in order for iTunes to recognize my ipod touch. The only change I made to the computer since yesterday is that I installed iOS 14 on my ipod touch. I'm on 10.13 and iMovie 10.1.6 (and I can't upgrade). I tried deleting the preferences: didn't solve anything. I also can't export any of the videos it previously exported in the last few days and weeks. The application doesn't bug or freeze (as I can keep working on the video or move to other projects), it just doesn't export the file. The little pie-chart progress indicator flashes for a fraction of a second before disappearing for good. But now, when I select all the clips in a project and select the 'Share - File.' option and hit 'OK', nothing happens. I've created and exported about 30 videos thus far and I understand the basics. Everything has been working fine until this morning. I've been using/learning iMovie in order to create online classes for my students because of COVID19.

Imovie not exporting