Quote:
Originally Posted by samlop10
I got a friend to lend it to me and watching it in HDR10... I mean the picture is rampant with compression errors, especially with the chroma and the film grain. I can't believe some of you think it looks fine in HDR10. The errors show up in almost every single scene. If there is even a semblance of a solid color in a shot, the chances it has chroma errors is like 80% on this codec. The green splotches are almost everywhere (obviously, click on them to see them full size to see the compression errors):
[Show spoiler]
On her lab coat, the cabinets in the back.
Almost anywhere here where there is a white object.
On his banjo and some of the white portions of the dog.
Here the street is littered with those green splotches.
CLICK ON SPOILER TO SEE THE REST:
[Show spoiler]
Other than the plants, there shouldn't be any green here, but there is (again the green splotches).
Top-right corner here.
Above her hair.
On the yellow wall here.
Above the plant and next to the bricks here.
On the newspaper clippings and basically anything that is supposed to be any shade of white.
On the newspapers.
On the newspapers.
On the newspapers.
On the collar of his coat.
On his coat and on the chef's clothing.
Anything white here (i.e. the cooks).
On the left wall.
Basically the whole bottom-left quadrant here.
Between the branches here.
On the truck and other light-colored areas.
The right side.
The right side again with the whiter areas.
Above her head here.
Basically this whole shot.
Those green splotches (the chroma errors) are everywhere. And these screenshots are only from the first 15 minutes. And as you can also see, the grain in some of those is rough. And it is not much different actually watching in motion. Interestingly, the chroma is a little masked in motion, but the grain looks worse in motion than it does on the screenshots. The grain freezes sometimes, then it suddenly changes a few frames later (almost like it forgot to it was supposed to be different in every frame), sometimes it's completely gone, other times it looks clumpy... I mean the whole thing almost looks like I compressed it on YouTube.
It is basically a complete disaster. If this was years ago when 4K/HDR was still a new thing at least there'd be a semblance of an excuse there. But we're well into it right now and we're still getting this crap. It's pretty unacceptable. And I'm amazed people are still trying to spend money on it and buy it.
I shudder to think how The Great Escape and Dressed to Kill will look after seeing this. Now I wish Criterion would have done these on 4K instead as they seem to be doing a much better job with the format compared to Kino now. Oh the irony. |
I need to bookmark this post so whenever some dilbert comes at me and says that chroma noise doesn't exist and that bitrate bitrate bitrate bitrate bitrate bitrate is the key to good compression on UHD I can just quote this post and laugh at them. 100GB disc? Check. Average base layer bitrate of 75 Mb/s? Check. Means FOOK ALL when you've got a bunch of monkeys doing the encoding? Check.
On a less vengeful note, this is literally what I mean when I talk about chroma noise related to compression. Colour seems to break out into these giant blocks of green or pink noise swarming underneath the grain and it's got nothing to do with the restoration itself or UHD "just showing it up more" or whatever rationalisation people want to choose. This is a compression artefact relating to the chroma channels not being managed properly.
Will everyone see it, even in HDR10 on a giant screen? No, for the same reasons people always miss regular compression artefacts on BD: any type of 'noise', be it analogue grain or digital crap, is regarded as the same thing by some viewers, an inconvenience to be looked past. I envy those people. But if you can tell film grain apart from digital crud you'll be forever cursed to notice things like this.
Quote:
Originally Posted by BluProofie
KLI: But the professional reviewers said there were no chroma errors, so they don’t exist!
|
I'm not usually so sanguine about "pro reviewers" but as most will be watching in DV I have no doubt that the recombined Dolby Vision output will make it look FAR betterer and will be it's own source of "it looks fine to me!" comments in this thread (and prolly many more threads after this, sadly). That's its own thing and needs to be treated as such, but these HDR10 layers are getting badly shortchanged once again. It's so bizarre though that StudioCanal's encoding seems to be much improved while Shout's and Kino's has dropped into the toilet
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