[FFmpeg-devel] Re: [Question] Learning about VVC and wasm

[Zhao Zhili via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

> On Nov 14, 2025, at 19:30, Rémi Denis-Courmont via ffmpeg-devel <ffmpeg-devel@ffmpeg.org> wrote:
> 
> 
> 
> Le 14 novembre 2025 06:09:25 GMT+02:00, Zhao Zhili via ffmpeg-devel <ffmpeg-devel@ffmpeg.org> a écrit :
>>> For FFmpeg, WASM optimisations are embryonic at best. There is no 
>>> documentation since there is very little experience with them as yet.
>> 
>> The wasm and wasm simd has already reached a considerable level of maturity.
> 
> There is only HEVC IDCT for 8- and 10-bit, and SAO for 8-bit. I don't doubt that those optimisations are good and mature. But in terms of coverage, compared to x86 and AArch64. That is embryonic IMO.

Oh I’m talking about the general wasm/wasm simd128 technique, not binding to FFmpeg.

Current wasm implementation in FFmpeg isn’t far from a proof of concept. I have done more work on this and get better speed boost, but the work isn’t in good
shape yet.

> 
> There are also no WASM guidelines in the optimisation doxygen file. How to write good assembler that runs fast on x86 and on AArch64 with intrinsics is not explained or referenced either.
> 
> To be clear, I'm not *faulting* anyone, and the RISC-V stuff, that I've been involved with, is also in many ways "embryonic" if less so than WASM's.
> 
> Br,
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