Karma XPU : noise jittering

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Hello,

Strangely, on only one sequence of a project render animation, we have a lot of noise jittering : from good to bad to really bad frames.
Half rendered images are just unusable :


look one frame before and the other one just after, result are drastically different.
We don't use any denoiser here.

Here is the setttings used :


Any idea of what happen ? (H.20.5.584)
Thank you

Attachments:
karma_noise.jpg (1.8 MB)
settings.jpg (53.9 KB)

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Two things jump to mind
- what happens if you render with the variance oracle disabled?
- are you able to replicate the issue with a simplified scene? (and therefore can submit a bug)
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Ok, we'll re-render without oracle for test.

About replicate on simplified scene, I'll try it but have absolutely no time to do this this week.
That's already 2 times we rendered this sequence..
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Are you in a position to post the source EXR files? (1 clean, 1 broken)
Perhaps there is information in the header that could give us clues
thanks
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Yes, thanks, I post them now to your support.
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Just a quick note to say that with variance oracle disabled (sampling set to uniform) the problem still here.

Edit: Also I still have no response from support since I post 2 rendered images (one good and one bad) last week..
Edited by julca - June 9, 2025 13:26:45
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