^(\[.+\] ?)?(?=.*\b(x265|HEVC)\b)(?!.*\b(x264|AVC)\b).*$
Using is the standard for modern media libraries looking to save significant storage space without sacrificing quality, especially for 4K content . While it offers roughly 50% smaller file sizes compared to x264 at equivalent visual quality, implementing it effectively in Sonarr requires careful configuration of Custom Formats and Quality Profiles . Performance Review: The Good and the Bad sonarr x265
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Under , you can define a custom format for x265. sonarr x265