Weird pixelated distortion glitch in After Effects timeline, but not in the source file (mp4)

Question

Hi Community,

I want to render a project I've been working on, but lately, After Effects creates all kinds of weird glitches. This glitch even gets rendered, which is a problem of course. In After Effects the frame gets very pixelated. At first, I thought the problem was in the mp4 render. But the mp4 looks fine and smooth. I already imported the mp4's again, re-linked them, reloaded, etc, but After Effects keeps destroying some of the frames. (see example below)

If I delete the cache (by going to edit > purge > All Memory & Disk Cache) the issue is resolved for like 2 seconds. When I scroll in the timeline, the pixel distortion appears again.

Has anyone experienced this issue before?

Jose Panadero · Accepted Answer

Probably is related to the hardware acceleration using your graphics card. I suggest you a couple of solutions:

A.- Transcode the video into another format like Quicktime ProRes

B.- Go to After Effects Preferences > Import and deactivate hardware acceleration for decoding video. Then delete the cache, restart AE and try again

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