HDR Discussion Thread

[Penton-Man]

Originally Posted by LordoftheRings

https://www.youtube.com/watch?v=qSwM...ature=youtu.be

NSFW?
I stopped watching after a few seconds when my wife walked by and asked what I was doing.
Is that a porno video starting out with a guy waking up in some hotel in Thailand, as I’m afraid to see who comes out of the bathroom and what happens next.

[LordoftheRings]

Fighter jets ...

• https://nationalinterest.org/blog/bu...ade-list-39807

https://www.youtube.com/watch?v=I9G_...ature=youtu.be

https://www.youtube.com/watch?v=ixy3...ature=youtu.be

[Penton-Man]

Originally Posted by Waboman

Your knee locked up? Damn! That's crazy. Probably too much soccer watching. I've read that can happen.

Long and costly story, will tell later when have more time. I recorded my Baltimore Ravens vs. the Browns game from this afternoon, must watch now and hope for the best. How’d the Vikings do today.

Already had too much fun here.
Later.

[Penton-Man]

Originally Posted by LordoftheRings

Fighter jets ...

there ya go
later

[LordoftheRings]

Originally Posted by Penton-Man

NSFW?
I stopped watching after a few seconds when my wife walked by and asked what I was doing.
Is that a porno video starting out with a guy waking up in some hotel in Thailand, as I’m afraid to see who comes out of the bathroom and what happens next.

It's right your alley Penton, plus on topic with this thread's main subject.
It's for video geeks. ...Video scientists.

[DanBa]

Originally Posted by puddy77

Can anyone think of a single situation where DV having backwards compatibility with HLG would be useful? I can’t even imagine a hypothetical where this would be necessary?

"As of today, all deployed broadcast systems are using HLG10."
https://blog.harmonicinc.com/reality...r-deployments/

Dolby Vision is flexible: in the past only BT.1866 gamma as base layer, then also HDR10, and now also HLG.
https://forum.blu-ray.com/showpost.p...postcount=7823

In a HLG HDR broadcast plant, ST 2094-10 Dolby Vision metadata can be created in some encoder.



https://forum.blu-ray.com/showpost.p...&postcount=971

[mrtickleuk]

Originally Posted by DisplayCalNoob

Has the DV enhancement layer resolution been explained, what does using 1080p benefit the content, while in top of the 2160p resolution of the base layer?

Perhaps it's only used as a container for the data.

ie, base layer = 10bit HEVC 2160p
and then to get the other 2 bits of picture data for each pixel, they can be taken from the enhancement layer (10bit HEVC 1080p).
so, each pixel from the enhancement layer contains the extra data bits to covers 5 pixels (2bits +2+2+2+2) in the base layer.
(Or 4, with the other 2 bits for other uses).
Just my speculation.

[Geoff D]

Originally Posted by DisplayCalNoob

Has the DV enhancement layer resolution been explained, what does using 1080p benefit the content, while in top of the 2160p resolution of the base layer?

I wouldn't look at it in terms of sheer resolution, think of it as more of a carrier for all the extra Dobly goodness. They can do a full rez enhancement layer in the DV profiles, but for reasons of preserving bitrate for whatever application they hit upon the method of a quarter rez carrier signal.

The enhancement layer (EL) first goes through a stream splitter to separate the video stream from the metadata, and I don't mean just the Display Management metadata (which doesn't apply at this stage) but the predictive data that's been generated to differentiate the base layer (BL) from the enhancement layer and vice versa. If the EL's resolution doesn't already match the BL then it gets upscaled to the same rez and is inverse quantized (rebuilt) using a set of pre-defined coefficients in the metadata relating to luma, chroma etc.

The BL meanwhile is undergoing processing of its own, going through a stage where it's made ready for the added enhancements using Prediction coefficients and EL Processing coefficients to map it to the EL. The same thing is happening to the EL to essentially create the difference between it and the BL using BL Processing coefficients. The two processed signals are then combined and their sum total is the 12-bit Dolby Vision output stream which is transmitted at 4:2:2 in keeping with modern video specs that don't usually permit 4:2:0 at <50/60p (I've seen nothing to suggest that the actual DV content itself is rendered out at 4:2:2).

[DisplayCalNoob]

Originally Posted by Geoff D

I wouldn't look at it in terms of sheer resolution, think of it as more of a carrier for all the extra Dobly goodness. They can do a full rez enhancement layer in the DV profiles, but for reasons of preserving bitrate for whatever application they hit upon the method of a quarter rez carrier signal.

The enhancement layer (EL) first goes through a stream splitter to separate the video stream from the metadata, and I don't mean just the Display Management metadata (which doesn't apply at this stage) but the predictive data that's been generated to differentiate the base layer (BL) from the enhancement layer and vice versa. If the EL's resolution doesn't already match the BL then it gets upscaled to the same rez and is inverse quantized (rebuilt) using a set of pre-defined coefficients in the metadata relating to luma, chroma etc.

The BL meanwhile is undergoing processing of its own, going through a stage where it's made ready for the added enhancements using Prediction coefficients and EL Processing coefficients to map it to the EL. The same thing is happening to the EL to essentially create the difference between it and the BL using BL Processing coefficients. The two processed signals are then combined and their sum total is the 12-bit Dolby Vision output stream which is transmitted at 4:2:2 in keeping with modern video specs that don't usually permit 4:2:0 at <50/60p (I've seen nothing to suggest that the actual DV content itself is rendered out at 4:2:2).

The patent says it is a container, but it also says that the resolution is upscaled to what the base layer resolution is. Also, if the base layer resolution is less than the enhancement layer, the EL has to be downscaled.

[Penton-Man]

Originally Posted by Waboman

I was just worried about Ray Liotta and hoped he didn't go back to smoking. Was relieved when I came out of surgery and he was still smoke free.

When I’m not worrying about you, I’m concerned that Mark (who defies description) may someday show up at one of these events - https://www.eventbrite.com/e/smpte-n...on-53830601779

wearing a jacket and tie, or worse yet, a tailored suit, and give someone in the audience like Blu-ray. com member ZoetMB a heart attack from the visual shock of seeing him uncommonly well dressed.

[Penton-Man]

Originally Posted by LordoftheRings

It's right your alley Penton,

Dude, I’m a happily married man, I think that stuff applies more to some of you single guys.

[Penton-Man]

Originally Posted by LordoftheRings

...Video scientists.

video, or otherwise -

In thee ol’ days would get donuts, or at most, croissants, when defending your dissertation in front of the committee and few outside the building were aware of your accomplishment, but that really didn’t matter at all because in your heart (and in those of your family) you knew you had accomplished something significant after years of hard work.

In modern times (these days) when somebody receives a doctorate degree, they announce it on twitter, facebook, linkedin, etc. as if they need positive reinforcement for achieving their goal from people they barely know or don’t even know at all. I never did get that. Not sure if it reflects the digital narcissistic society in which we now live (“I am proud to announce I [fill in the blank]”), insecurity or what.

Just seems the days of quiet personal satisfaction being all that was needed, e.g - https://www.youtube.com/watch?v=cN7tuTNCBZE#t=1h21m7s
are long gone.

[Penton-Man]

Starting the New Year off with a high…. https://twitter.com/northropgrumman/...69151030333441

[Waboman]

Originally Posted by Penton-Man

When I’m not worrying about you, I’m concerned that Mark (who defies description) may someday show up at one of these events - https://www.eventbrite.com/e/smpte-n...on-53830601779

wearing a jacket and tie, or worse yet, a tailored suit, and give someone in the audience like Blu-ray. com member ZoetMB a heart attack from the visual shock of seeing him uncommonly well dressed.

Lol. Maybe it’s the champagne and pain killers, but I have no idea what you’re talking about.

P.S. happy new year.🍾

[Penton-Man]

Originally Posted by Geoff D

quantized

Now you’re spelling like us here on this side of the pond…https://patents.justia.com/assignee/...ng-corporation

Check out dem benefits…..
https://pixelogicmedia.workable.com/j/5F6288692E

[Penton-Man]

A company accomplishment from 2018 which went under the radar….https://www.bertelsmann-printing-gro...e-schallmauer/

Originally Posted by Staying Salty

I believe that is when it breaks the sound barrier.

[Penton-Man]

Originally Posted by LordoftheRings

and offloading….

[LordoftheRings]

Originally Posted by Penton-Man

Starting the New Year off with a high…. https://twitter.com/northropgrumman/...69151030333441

Wow check that kite in the sky above, Russian? ...Manipulated by a married man?

Happy New Year Penton Man, and to all your family.

[Geoff D]

Originally Posted by Penton-Man

Now you’re spelling like us here on this side of the pond…https://patents.justia.com/assignee/...ng-corporation

Check out dem benefits…..
https://pixelogicmedia.workable.com/j/5F6288692E

If they had a spot for a teaboy I suppose I'd be qualified enough for that. Any monkey can recite stuff he finds on the interwebs

[Penton-Man]

Originally Posted by Geoff D

If they had a spot for a teaboy I suppose I'd be qualified enough for that. Any monkey can recite stuff he finds on the interwebs

You underestimate your capabilities. Perhaps a little bit of learnin, but I think you could handle more than one entry job.