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I would assume (completely uninformed assumption, however) that WebAssembly without SIMD won't be performant enough to decode this in realtime.

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We already have an enscripten'd decoder, built into a nice analyzer tool that lets you inspect the AV1 bitstream! But you're right, it'll need SIMD to decode at high resolutions in realtime.

[1] https://0x0.st/tQ

JavaScript doesn't have SIMD

JavaScript was once to have SIMD. ;- )

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

Yep, but now just WebAssembly

They're kinda unrelated. I don't think WebAssembly has explicit SIMD operations yet? Then again, maybe WebAssembly could be delivered in a form which makes autovectorization straightforward for some subset of use cases.

There's a proposal for SIMD but it's not in any shipping browsers AFAIK.

https://github.com/WebAssembly/simd/blob/master/proposals/si...

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