Grain is the enemy of x265. RARBG used a light denoise filter via -vf hqdn3d to tame grain before encoding.
Extract the master display metadata from your source and pass it along: Rarbg X265 Encoding Settings
According to community-shared RARBG Encoding Settings on Gist , here is how you might structure a command: Grain is the enemy of x265
For 1080p content, a CRF of 21 delivers excellent transparency. Action scenes get more bitrate, while static scenes get less. For 4K UHD content, they often pushed CRF to 23 or 24 . 2. Color Depth (10-bit Encoding) Parameter: --output-depth 10 Action scenes get more bitrate, while static scenes get less
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Anime compresses extremely well, but suffers from banding (gradients in skies/shadows). RARBG added a grainy dither to mask banding.