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I have interior scene in cycles render and it's flickering after rendering. I denoised render with compositing nodes. Rendered with Optix, GeForce RTX 2060, 200 samples, 24fps.

There is lighting (sun lamp 20W, portals, spotlights), plus hdri with strength of 15 lighting

See flickering animation: https://www.youtube.com/watch?v=dqozCEtRvSE

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    $\begingroup$ It's likely caused by denoising. Try disabling it or increasing the number of samples $\endgroup$
    – Gorgious
    Commented Apr 23, 2021 at 8:30

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This flickering looks like the typical denoise smears (flickering). It can be that your denoising way too much/strong, so the smears of the denoise changes from frame to frame and are not consistent anymore because your raw output is too noisy. You can try to set a denoise seed or you might need to render with more samples. You can also try to denoise the animation afterwards, in a other program.

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