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Why upscaling old low-res video makes it look worse, and the ffmpeg filters that fix it

This story is from 2026-11-05. It is preserved in the archive; the latest stories are on the live feed.

If you've ever run an old 240p YouTube rip or a 2012 phone video through an AI upscaler, you've probably seen this: the output is bigger and sharper, and somehow looks worse . Faces turn into mosaics. Flat walls grow a grid of tiles. Edges get a crunchy halo. I build a video restoration app, and th…

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  1. 2026-11-05 10:38 · DEV Community — AI
    Why upscaling old low-res video makes it look worse, and the ffmpeg filters that fix it

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