Before you begin, make sure to back up your iMovie libraries, your media, and the iMovie app.
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Try these troubleshooting steps in order
After trying each step below, test iMovie again to see if you've fixed your issue.
Restart your MacReset NVRAM
If you use an external device with iMovie like a camera, reset NVRAM:
Update macOS and iMovie
Choose Apple menu > App Store, then click Updates. If an iMovie update is available, click Update to download and install it.
Check camera and media format compatibility
Make sure you're using a camera and media format that works with iMovie. If you can't find your camera listed or need further assistance, contact the manufacturer of the device for support.
If you're using a third-party video interface with your Mac, check with the manufacturer for firmware or other software updates for your device.
Test with a new library and project
You can create a new library and test project to check if the issue is with your library, project, or iMovie app. First, create a new library:
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Next, create the test project using a built-in trailer template, then export it as a QuickTime video file:
Next, import the QuickTime video file into a new project in the new library:
If the new library and project work as expected, you've isolated the cause of your issue to the original library or project. Try to restore a previous version of the original library from a Time Machine or other backup.
Test iMovie with a new user account
Create another user account on your Mac, then test iMovie with the new user account. How to open mail app on mac. How to get rid of google apps on mac.
Reset iMovieReinstall Notes App Mac Os
Reset iMovie to default settings. Libraries won't be affected.
Reinstall iMovie
Delete iMovie, then redownload and reinstall it. Libraries won't be affected.
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