Upscaling comes in three strengths. Each makes up more than the last. ffmpeg's lanczos scaler resizes with arithmetic and adds no detail, while Real-ESRGAN, from 2021, is a per-frame model whose portable build runs on a Mac, Windows or Linux without Python and sharpens by guessing what each frame alone should contain. Video diffusion upscalers such as ByteDance's SeedVR2 and Topaz Labs' Starlight models look at many frames together and generate detail that holds steadier across time, which is exactly why their inventions are the most convincing.
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