It sounds like you’re noting the (High Efficiency Video Coding, also known as H.265) encode of Rick and Morty S01E02 (“Lawnmower Dog”) — likely because it offers better compression than H.264, keeping file sizes smaller while retaining quality.
Would you like help extracting the encoding parameters from the file, or are you curious about how HEVC improves animation quality in general? rick and morty s01e02 hevc
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