Artefacts after rendering final cut

Hi,

I'm getting some artefacts every now and again after rendering in Final Cut Pro - almost like a transition was broken BUT there are no transitions.

I've got a bunch of iPhone 11 Pro footage, all on the same track/timeline (can you tell I'm a novice!).

After rendering, the artefacts almost look like the system was having trouble deciding which piece of footage to show so shows so shows both.

I've tried deleting the render files and tried rendering in all sorts of different prores settings but I still get the same - although seemingly at different points.

Can someone help?!

MacBook Pro 15”, macOS 10.15

Posted on Oct 23, 2019 12:49 AM

Top-ranking reply

kiaora76

Level 1

8 points

Posted on Oct 31, 2019 3:15 PM

After speaking with Apple tech pros, the only thing I've found that solved my issue is to optimize any clip you use. This ideally can be done upon import, or afterward in the browser (but not the timeline, meaning if you have existing projects like I do, you have to replace those pieces with the optimized versions) by control-clicking each clip and going to Transcode Media, then Optimize. That turns the clips into more "Apple-friendly" versions that didn't have those crazy issues in the projects or once exported (finally!!!). My problem seemed to be connected to the Catalina update and my type of videocamera, which has an AVC1 codec that is still "acceptable"(ish) to FCPX but not "preferred," hence the optimizing (which I think turns it into a ProRes 422 clip that Apple really likes...or something like that -- I'm no tech expert!!). Not sure if it would work for you, but might be worth a try. Also, the only reason I updated to Catalina was because FCPX would no longer open until I did that; I'm not sure if Apple will eventually force you do to the same. Anyway, good luck to you!

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Artefacts after rendering final cut

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