imovie crashes on mojave importing video
I have a 27" imac 3.3 processor with 16 gig of ram. I have used this machine for over 3 years editing our church video services for youtube. Almost same size every week and nothing changed. Since upgrading to 10.14 Moj. every time I try to import the file into imovie it gets to the end of the import and crashes. It gives me a message saying I have run out of system memory. Never had a problem at all with the same machine and same file on High Sierra or before. If you play with it and do a power management reset and every other thing you can think of you might get it done but it is hit or miss and mostly miss. I make sure all apps are shut down which I never had to do before even to the point of going into activity monitor and shutting down things there. I have a second imac and am having simuler problems with it on a trial basis as I normally do not use it for video editing. But wanted to try to see if it was just the one machine or something else. I have talked to apple support and they did mostly things that I have already tried and no resolution has been found. Anyone else having a problem or hopefully a fix for this?
IMAC (RETINA 5K, 27-INCH, LATE 2015), macOS Mojave (10.14)