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lavc nr is a decimation-with-filtering noise reduction algorithm. This means that it will act directly on things like grain and pixellation type artifacts. Anime should be denoised with the hqdn3d filter, which is a temporal denoiser more suited to anime (and highly recommended!).
lavc nr is a decimation-with-filtering noise reduction algorithm. This means that it will act directly on things like grain and pixellation type artifacts. Grain is handled using values from 10-30, and pixellation responds well at values of 110-150. Anime should be denoised with the hqdn3d filter, which is a temporal denoiser more suited to anime (and highly recommended!).