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AV2 video codec delivers 30% lower bitrate than AV1, final spec due in late 2025

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Re: AV2 video codec delivers 30% lower bitrate than AV1, final spec due in late 2025

#221

Post by lxgr »

axiolite wrote: post #151
mckirk wrote: post #54

Earlier quoted context omitted.

It'd be really cool if we had 'upgradable codec FPGAs' in our machines that you could just use flash to the newest codec... but that'd probably be noticeably more expensive, and also not really in the interest of the manufacturers, who want to have reasons to sell new chips.

> FPGAs' in our machines that you could just use flash to the newest codec They're called GPUs... They're ASICs rather than FPGAs, but it's easy to update the driver software to handle new video codecs. The difficulty is motivating GPU manufacturers to do so... They'd rather sell you a new one with newer codec support as a feature.

They’re programmable parallel compute units, and as such pretty much the conceptual opposite of ASICs.

The main point of having ASICs for video codecs these days is efficiency, not being able to real-time decode a stream at all (as even many embedded CPUs can do that at this point).

Re: AV2 video codec delivers 30% lower bitrate than AV1, final spec due in late 2025

#222

Post by ValdikSS »

axiolite wrote: post #197
ValdikSS wrote: post #188

Earlier quoted context omitted.

But that's the whole multiplex, right? It could be a single channel, but usually you have many in the multiplex. I don't know how it works in the US, but for DVB-T(2) that's how it is.

Circa 2009 when analog TV was first shut-off in the US, each DTV station usually only had one channel, or perhaps a second basic one like a static weather radar on-screen. Some did have 3 or 4 sub-channels early on, but it was uncommon. Circa 2019, after the FCC "repack" / "incentive auction" (to free-up TV channels for cellular LTE use) it became very common for each RF channel to carry 4+ channels. But to be fair,…

Wow, that's really different compared to what we have in EU, with up to 10 SD channels in a single multiplex.

Re: AV2 video codec delivers 30% lower bitrate than AV1, final spec due in late 2025

#223

Post by throwaway48476 »

akie wrote: post #67
throwaway48476 wrote: post #29

Earlier quoted context omitted.

It's a shame European energy efficiency rules made 8K non viable. It's a great resolution.

Yeah damn those Europeans for outlawing energy inefficient things

It takes 2 seconds to turn the setting off. It's a pointless policy that just creates annoyance.

Re: AV2 video codec delivers 30% lower bitrate than AV1, final spec due in late 2025

#224

Post by pezezin »

DoctorOetker wrote: post #215
dddgghhbbfblk wrote: post #68

Earlier quoted context omitted.

>Is there a reason codec's don't use the previous frame(s) as stored textures, and remap them on the screen? I can move a camera through room and a lot of the texture is just reprojectivetransformed. I mean, that's more or less how it works already. But you still need a unit of granularity for the remapping. So the frame will store eg this block moves by this shift, this block by that shift etc.

> But you still need a unit of granularity for the remapping. So the frame will store eg this block moves by this shift, this block by that shift etc. This is exactly what I question. Why should there be block shaped units of granularity? defining a UV-textured 3D mesh that moves and carries previous decoded pixel values should have much less seams, with a textured mesh instead of blocks the only de novo pixel values…

And how do you plan to extract that mesh and texture from an arbitrary input video?

Having worked in the field of photogrammetry, I can tell you that it is a really complex task.

Re: AV2 video codec delivers 30% lower bitrate than AV1, final spec due in late 2025

#225

Post by axiolite »

ValdikSS wrote: post #222
axiolite wrote: post #197

Earlier quoted context omitted.

Circa 2009 when analog TV was first shut-off in the US, each DTV station usually only had one channel, or perhaps a second basic one like a static weather radar on-screen. Some did have 3 or 4 sub-channels early on, but it was uncommon. Circa 2019, after the FCC "repack" / "incentive auction" (to free-up TV channels for cellular LTE use) it became very common for each RF channel to carry 4+ channels. But to be fair,…

Wow, that's really different compared to what we have in EU, with up to 10 SD channels in a single multiplex.

You could technically fit 10 SD channels together in the US, except I recall that the government ("FCC") specifically REQUIRED (at least during initial rollout) at least one to be in highdef, unless you applied for a special waiver.

These days the FCC is unlikely to care, but I suspect viewership would suffer if any of the major broadcast networks downgraded their "main channel" signal to SD.

This explains the typical arrangement, as well as listing some of the extreme cases:

https://en.wikipedia.org/wiki/Digital_subchannel#United_Stat...

https://en.wikipedia.org/wiki/Digital_subchannel#Tradeoffs

Re: AV2 video codec delivers 30% lower bitrate than AV1, final spec due in late 2025

#226

Post by axiolite »

ttoinou wrote: post #191
axiolite wrote: post #139

Earlier quoted context omitted.

Are you deaf? I can't see how anyone else would be happy downloading a file they can watch fine but can't hear .

Audio patents are expiring and there shouldn’t be any difficulty decoding real time most audio codecs. If you can decode the video real time there’s a very good chance you can decode the audio real time too.

Though things are pretty boring and stable right now, there have been many times when audio codecs were changing rapidly and many people didn't have (and often couldn't get or use) an audio codec that was being commonly used in video files distributed online.

Re: AV2 video codec delivers 30% lower bitrate than AV1, final spec due in late 2025

#227

Post by CooCooCaCha »

bee_rider wrote: post #107
CooCooCaCha wrote: post #103

Earlier quoted context omitted.

Entertainment is becoming increasingly customizable and personalized. It’ll get to the point, like you said, that we’re not watching the same movie, playing the same game, etc. It feels like we’re losing something, a shared experience, in favor of an increasingly narcissistic attitude that everything needs to shapeable to individual preferences instead of accepting things as they are.

I dunno. Entertainment is sort of inherently selfish, right? It is an unproductive thing we engage in to make us happy. I’d be somewhat interested in something like a git that generates movies, that my friends can push to. Extremely widespread mass media fiction broadcast are sort of an aberration of the last 75 years or so. I mean, you’d have works in ancient times—the Odyssey—that are shared across a culture. But,…

The idea that entertainment is selfish because it doesn’t produce anything is offensive to the core.
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