ProRes 4444 exports in Beta 22.1 have color shift and added grain

New Here ,
Sep 27, 2021 Sep 27, 2021

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Testing out the latest AE Beta v22.1.0.3 on Windows and found that any export of ProRes 4444 (including XQ) has a color shift and small additional amount of grain. 

I've tried CUDA vs. Software Only, 32 vs 16 bpc project, Millions vs Trillions of Colors, MFR vs No MFR - all exhibit the same issue. Note: AE 2021 on the same system renders the ProRes 4444 correctly.


To test the actual shift, I created a 50% gray solid composition in 32bit and rendered it out in multiple different formats:

ProRes 422, ProRes 4444, ProRes 4444 XQ, (and Tiff Sequence as a control)


When re-importing the renders, the 4444 and 4444 XQ renders exhibit the shift, as seen in the RGB values, for example:

Original grey solid:


ProRes 4444 Render:


Here's the ProRes 4444 on top of the original 50% gray with a Difference blending mode (comp viewer exposure is bumped up about +12). Played back, the grain pattern moves uniformly across the screen.



I've included all of the renders of the 50% gray and a video of the difference blend playing back at this link so you can take a look: 


I understand that ProRes is a lossy format and won't be exactly the same as the original, but this color shift and grain is new to me in this beta. AE 2021 renders everything as expected.


System info
    Application: After Effects (Beta) v22.1.0.3
    OS: Windows v10.0.19043, RAM: 127.95 GB GB, CPUs (logical): 32

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