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Perceptually lossless (talking head) video compression at 22kbit/s

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Re: Perceptually lossless (talking head) video compression at 22kbit/s

#131

Post by pizza »

LegionMammal978 wrote: post #53
high_byte wrote: post #16

Earlier quoted context omitted.

why not? if you change one pixel by one pixel brightness unit it is perceptually the same. for the record, I found liveportrait to be well within the uncanny valley. it looks great for ai generated avatars, but the difference is very perceptually noticeable on familiar faces. still it's great.

For one, it doesn't obey the transitive property like a truly lossless process should: unless it settles into a fixed point, a perceptually lossless copy of a copy of a copy, etc., will eventually become perceptually different. E.g., screenshot-of-screenshot chains, each of which visually resembles the previous one, but which altogether make the original content unreadable.

Perceptual closure under repeated iterations is just a stronger form of perceptual losslessness, then, after k generations instead of the usual k=1. What you’re describing is called generation loss, and there are in fact perceptually lossy image codecs that have essentially no generation loss; jpeg xl is one https://m.youtube.com/watch?v=FtSWpw7zNkI

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#132

Post by exe34 »

Retric wrote: post #117
exe34 wrote: post #112

Earlier quoted context omitted.

> If changing the laws of the universe is fine, then nothing gets excluded even Harry Potter the laws of the universe in Harry Potter are so fickle and ever changing with the plot line that to me, it can only be considered soft. compare with Egan who takes a given cosmology and then works 100% within that world. that's hard.

That’s not a question about the underlying rules of a fictional work but your perception of how they are created. It’s possible to have a completely well defined fantasy setting with exact rules without the reader being aware of what those rules are or even knowing it’s using well defined rules. Consider The Martian, early versions where posted online and the author changed what resources the character had to work wi…

You seem to confuse the creative process with the final product. The rules can change during the creative process. It's the final product that I judge as a reader - I won't bother going over the inconsistencies in Harry Potter here, it's been done ad nauseam elsewhere. The physics doesn't change over the course of the story of the Martian.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#134

Post by _kb »

gwd wrote: post #43

This reminds me of a scene in "A Fire Upon the Deep" (1992) where they're on a video call with someone on another spaceship; but something seems a bit "off". Then someone notices that the actual bitrate they're getting from the other vessel is tiny -- far lower than they should be getting given the conditions -- and so most of what they're seeing on their own screens isn't actual video feed, but their local computer'…

At least for audio, that dystopia is already shipping in end-user product: https://blog.webex.com/collaboration/hybrid-work/next-level-...

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#135

Post by Separo »

stuaxo wrote: post #133

Bit off putting that it's Musk for some reason, maybe it's just overexposure to his bullshit, I could quite happily never see him again. Maybe there is a custom web filter in there somewhere that could block particular people and images of them.

We could run something like TensorFlow.js in a Chrome extension to identify the person in the image and replace it in the dom. A little resource intensive for inference on every image in but probably worth it in this case.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#136

Post by Retric »

exe34 wrote: post #132
Retric wrote: post #117

Earlier quoted context omitted.

That’s not a question about the underlying rules of a fictional work but your perception of how they are created. It’s possible to have a completely well defined fantasy setting with exact rules without the reader being aware of what those rules are or even knowing it’s using well defined rules. Consider The Martian, early versions where posted online and the author changed what resources the character had to work wi…

You seem to confuse the creative process with the final product. The rules can change during the creative process. It's the final product that I judge as a reader - I won't bother going over the inconsistencies in Harry Potter here, it's been done ad nauseam elsewhere. The physics doesn't change over the course of the story of the Martian.

What you view as inconsistencies are based around assumptions for how the underlying rules work and what happened that don’t necessarily apply.

One of the more interesting science fiction short stories I read seemed to have very inconsistent time travel, but on closer reading you find the two different methods involved had two different sets of rules. It’s easy to say something is inconsistent, but any possible story has a corresponding set of rules that work.

It’s rather similar to considering what characters may have been lying in a story.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#137

Post by DoneWithAllThat »

Rebelgecko wrote: post #115
gwd wrote: post #43

This reminds me of a scene in "A Fire Upon the Deep" (1992) where they're on a video call with someone on another spaceship; but something seems a bit "off". Then someone notices that the actual bitrate they're getting from the other vessel is tiny -- far lower than they should be getting given the conditions -- and so most of what they're seeing on their own screens isn't actual video feed, but their local computer'…

Was that the same book that had the concept of (paraphrasing using modern terminology) doing interstellar communications by sending back and forth LLMs trained on the people who wanted to talk, prompted to try and get a good business deal or whatever?

This idea was also used in The Algebraist.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#139

Post by exe34 »

Retric wrote: post #136
exe34 wrote: post #132

Earlier quoted context omitted.

You seem to confuse the creative process with the final product. The rules can change during the creative process. It's the final product that I judge as a reader - I won't bother going over the inconsistencies in Harry Potter here, it's been done ad nauseam elsewhere. The physics doesn't change over the course of the story of the Martian.

What you view as inconsistencies are based around assumptions for how the underlying rules work and what happened that don’t necessarily apply. One of the more interesting science fiction short stories I read seemed to have very inconsistent time travel, but on closer reading you find the two different methods involved had two different sets of rules. It’s easy to say something is inconsistent, but any possible story…

When it comes to Harry Potter,

> but on closer reading

does not make the inconsistencies go away, but they multiply.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#140

Post by up2isomorphism »

hinkley wrote: post #90
up2isomorphism wrote: post #72

“Perceptually lossless” is an oxymoron.

You’re still listening to vinyl, arntcha? Lossiness definitely matters when you’re doing forensics. But not for consumers. If you just want to bop to Taylor who the fuck cares. The iPod ended that argument. Yes I can be a perfectionist, or I can have one thousand songs in my pocket. That was more than half of your collection for many people at the time.

Calm down dude. It is just a marketing term for something lossy.
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