HD footage jerky in timeline on iMovie
Ok. This is driving me mad. I have a MacBook Pro (Catalina 10.14.7). I have successfully used iMovie to edit HD footage from my Sony HDR XR160 Handycam for some time.
However, the last couple of times I found that I couldn't edit HD because in that form it was jerking on the timeline. This made fine editing impossible. Then I found that if I shot using STD image quality it would go smoothly on the timeline.
I have read up on this and much of the advice concerns clearing the storage and memory on the computer. I have therefore now removed all video material, including everything in iMovie Libraries, to an external hard drive. I naively believed it would all go back to normal and I could edit in HD again.
No luck, I'm afraid.
Is this something that I can fix without having to buy a whole new laptop (I've had this one for 8 years). I have something coming up which I'd really prefer to shoot in HD as the STD just doesn't quite cut it visually.
I would appreciate any advice on this. Please help!!