Hi,
As you have found, deleting the media from the timeline will not delete the media from the iMovie library. Unfortunately, deleting media from the iMovie library is very risky. (See below).
Two ways to delete media from the iMovie library:
- Select the clip in the timeline or in the media browser and do a File/Reveal in Finder. An Original Media folder will pop up with the name of the selected clip highlighted. Delete it from there.
2.Select and delete the media from the iMovie timeline by pressing the delete key on your keyboard. Then control click on the clip in the project media browser and select Delete Media from Event in the drop down menu.
WARNING: Be aware that deleting media from the iMovie library will remove the media from all projects that are referring to it. So you will be disabling those projects. Therefore you will need to share out the project before deleting the media if you want to preserve your work. I'm not exactly clear as to your workflow, but if you are intending to preserve several games in your iMovie project or projects, you cannot delete the clips from the iMovie library. If you do, you will end up with black thumbnails with a question mark in them and a missing file notification.
When one is working with movies and have a disk space issue, the solution is to purchase an external drive, formatted Mac OS Extended (Journaled) or APFS, to store the iMovie libraries. That way the iMovie media files will not take up space on the internal drive.
-- Rich
-- Rich