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Dav2d

jbkempf.com

21–30 of 212 posts

Re: Dav2d

#21
post #7

Sorry if this sounds naive, but does it make sense to write a codec library in C/ASM considering how well Rust is progressing, especially when, as the author puts it, AV2 decoding is roughly five times more complex than AV1 decoding ?

Yes? There is 5x more code to optimize the ASM for.

Re: Dav2d

#22
post #7

Sorry if this sounds naive, but does it make sense to write a codec library in C/ASM considering how well Rust is progressing, especially when, as the author puts it, AV2 decoding is roughly five times more complex than AV1 decoding ?

The algorithms deployed in these kind of codecs take into account not only human vision and mathematical laws of information, but also nitty-gritty details of how computers work, which are optimally exploited by directly having humans write detailed assembly rather than a compiler make a best guess and effort.

Re: Dav2d

#27
post #17
post #7

Sorry if this sounds naive, but does it make sense to write a codec library in C/ASM considering how well Rust is progressing, especially when, as the author puts it, AV2 decoding is roughly five times more complex than AV1 decoding ?

Go ask FFmpeg what they're writing their encoders and decoders in.

That isn’t particularly helpful to someone asking a question in good faith. What others are using doesn’t clarify why they are using it. Plus, FFmpeg is itself a decade older than Rust. The OP is asking about starting a new project today.

Re: Dav2d

#28
post #10

Earlier quoted context omitted.

How does that prove anything? They're claiming that there are patents, but that doesn't mean there are.

Dolby is only the most recent case, Sisvel consorsium actually bills licences per device: Consumer Display Device: EUR 0.32 Consumer Non-Display Device: EUR 0.11 (source here: https://www.sisvel.com/licensing-programmes/audio-and-video-... )

Can you point to any other patent lawsuit over AV1? AFAIK the Dolby case is the first.

Re: Dav2d

#29
When AV1 was first announced, I got the impression the name was chosen partly as a pun/reference/homage to AVI, the classic but outdated format with used to be popular. Then when I saw Dav1d, OK, good way to continue the pun.

But now with AV2 and Dav2d, that completely breaks. Are we eventually going to get AV3/Dav3d and AV4/Dav4d, which will read like Ave/Daved and Ava/Davad? Seems a bit awkward. Was the idea from the start to have the 1 be the version number, and have it specifically be part of the name?

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