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Dav2d

jbkempf.com

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Re: Dav2d

#71

Post by ZeroGravitas »

jordand wrote: post #52
breve wrote: post #40

Earlier quoted context omitted.

Hardly niche. My laptop isn't new and it has hardware AV1 decoding and encoding. My 10 year old iPhone 7 can play 1080p AV1 video in software for over 200 minutes with VLC. The iPhone 7 was released in 2016, a year and a half before AV1. The dav1d decoder is mighty. Netflix uses AV1: https://netflixtechblog.com/av1-now-powering-30-of-netflix-s... YouTube uses AV1. It's tough to be more mainstream than that. Right cli…

Yeah I could imagine the AV1 codec sticking around for a very long while, even as a fallback for AV2. There's still hundreds of millions of people out there using old/cheap devices (especially in developing countries) where that battery drain from software decoding is a big problem, so AV2 would be nonviable.

Some of the early use of VP9 and AV1 was Netflix serving video to people in developing countries. Their metered bandwidth was more of a bottleneck than the CPU playback.

Re: Dav2d

#72

Post by throawayonthe »

LoganDark wrote: post #68
jbk wrote: post #16

Earlier quoted context omitted.

Because it's 5 times more complex, you need to get the maximum performance available. Therefore more ASM than ever. Rust does not bring more performance. Just more safety.

The safety can be worth it in certain cases. Like when handling untrusted input. And it's not just Rust: look at WUFFS for example. WUFFS can actually rival handwritten implementations in certain cases.

but not these cases

Re: Dav2d

#73

Post by p1mrx »

latexr wrote: post #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was first announced, I got the impression the name was chosen partly as a pun/reference/homage to AVI, the classic but outdated format with used to be popular.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 t…

I think it's a reasonable decision. The only people who will interact with dav2d by name are codec nerds, and a simple increment makes the lineage more obvious to that audience.

Re: Dav2d

#74

Post by throawayonthe »

poly2it wrote: 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 it makes sense to use C/ASM here, but if you're curious, there is a rust port of dav1d named rav1d: https://github.com/memorysafety/rav1d

it's not much slower than the original C/ASM implementation (last i checked ~5%?) but that matters here

Re: Dav2d

#75

Post by Caspy7 »

BillStrong wrote: post #53
0x1ceb00da wrote: post #41

Earlier quoted context omitted.

What does "complexity" mean here? Computation required?

Yes, much higher computation required to encode it, and decode it, both.

He only mentioned decode complexity. Would be interesting to know the average encode complexity compared to AV1.

Re: Dav2d

#76

Post by ant6n »

MaxikCZ wrote: post #35
UnlockedSecrets wrote: post #12

Earlier quoted context omitted.

Return of the 8MB Shrek encodes?

https://web.archive.org/web/20210416200451/https://cdn.disco... Shrek 1 at 8.34MB including audio.. insane

There's a 64MB game boy advance cartridge with shrek on it [1]. Looks pretty horrible [2]. But the GBA only has 16KB fast / 256KB slow RAM, and a 16MHz CPU.

[1] https://archive.org/details/Shrek-Video-GBA [2] https://www.youtube.com/watch?v=CyOfPZQl4MI

Re: Dav2d

#77

Post by xp84 »

latexr wrote: post #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 t…

As with all naming schemes in the tech world, I am sure no future scenarios, including successor names, were ever considered

Re: Dav2d

#78

Post by xp84 »

Hendrikto wrote: post #46
jl6 wrote: post #38

Earlier quoted context omitted.

1dav2codecs? 2av2furious?

And then AV3: Tokyo Drift, and after that AV Episode 1.

Or go the Apple Watch naming scheme route.

Just “AV”

Next, AV Series 1 and 2 (released simultaneously)

Later, AV Edition but it costs $10,000

Re: Dav2d

#80

Post by BetterThanSober »

kaka314 wrote: post #66
celsoazevedo wrote: post #64

"Too Many Requests" - https://web.archive.org/web/20260531130034/https://jbkempf.c... - https://archive.md/ln5UE

Too much traffic from HN? ``` Too Many Requests The page you have tried to access is not available because the owner of the file you are trying to access has exceeded our short term bandwidth limits. Please try again shortly. Details: Actioning this file would cause "jbkempf.com//blog/2026/dav2d/" to exceed the per-day file actions limit of 160000 actions, try again later ```

I don't know if I'm underestimating HN's reach but I doubt we did that, probably traffic from a much bigger aggregator/forum
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