M
TIL about Netflix’s clever film grain hack.
For years Netflix has apparently been using a feature of the AV1 video codec that lets it strip out bitrate-destroying grain, then add it back in when the stream is being decoded. That means that the device you’re watching Netflix on is actually using a map to generate the grain effect on the fly.
You can watch a talk from 2019 explaining the process below, and if you really want to dig into the details, here’s the paper proposing the tech.
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