Video Artifacts in Multicam Sequences

[addfrench]

Hi there,

I've taken over editing a project from another editor. The other editor created a multicam sequence and I'm seeing some visual artifacting in the footage occasionally. It looks like this – a horizontal line that breaks up the image and only appears for a frame or two (its position varies in the frame; sometimes it's a partial line, other times it extends the full width of the frame) It doesn't seem to be reflected in the original source media, just the multicam sequences and final renders. It looks like this:

I've worked with my own multicam sequences and haven't encountered this issue before. I'm curious if anyone has a fix for it that doesn't require me replacing all of the footage with the original source material, because that would be a nightmare. 🙂

Thanks everyone!

P.S., The files are XAVC 4K mp4s at 23.976fps. I'm running Premiere 14.3.0 (Build 38) on a Mac Pro, OSX 10.15.6.

[R Neil Haugen]

That sort of thing tends to be a GPU or GPU driver issue.

Neil

[addfrench]

Hey Neil

Software is up to date in OSX, which should include any updated drivers for my AMD FirePro D500. Any idea or ways I can fix the issue if it's a GPU issue?

Thanks!

[R Neil Haugen]

Check by setting your Project setting for Mercury Acceleration to software only. If that goes away, you probably need to manually change the driver.

Neil

[Michael Grenadier]

just in case it's simply an transient artifact, duplicate the sequence and flatten the mutlicamera clip and see if the problem goes away...  but as Neil suggests, check to see if you have the latest drivers for the graphics card...