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Old 19th September 2021, 04:49   #541  |  Link
ksec
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Quote:
Originally Posted by birdie View Post
A paper on H.266 > H.265:

https://arxiv.org/pdf/2109.06555.pdf
Quote:
In addition, we demonstrated that the participants had noted a difference between uncompressed 4K and 8K at a viewing distance of 0.8H for most of the tested sequences.
0.8H is approximtely 0.8m, for an 85" TV
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Old 19th September 2021, 07:36   #542  |  Link
Jamaika
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Originally Posted by FranceBB View Post
So it looks as if somewhere it gets converted and it's no longer yuv420p 8bit.
What happened?
https://vcgit.hhi.fraunhofer.de/jvet...sts/2119/diffs
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Old Yesterday, 23:49   #543  |  Link
benwaggoner
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Originally Posted by ksec View Post
0.8H is approximately 0.8m, for an 85" TV
80mm from a 219mm screen? My geometry is pretty rusty, but wouldn't that would put the viewing angle to the edges of the screen at quite a bit more than >45 degrees! Not a comfortable or plausible viewing distance for entertainment content as it exists.

Maybe one could shoot with lots of surround to fill the peripheral vision, and used a curved screen or something...
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Old Yesterday, 23:59   #544  |  Link
benwaggoner
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Originally Posted by rwill View Post
I like .yuv more and .y4m is somewhat dated. I dont know if it even supports more than 8 bit officially.
I certainly have plenty of 10-bit .y4m files that work perfectly with a variety of tools. And avoid the myriad issues of messing up some little parameter for input and getting a garbage encode. Height, width, chroma subsampling, bit depth, fps, there's a lot of different variables that aren't always documented.

Quote:
With .yuv you can cut out a snippet very precisely just by skipping and copying blocks of bytes with a fixed size. Like with the Unix tool 'dd'. Cant do that with .y4m. And what does one save by using .y4m ? No need to specify size and fps ?
Well, with .y4m one could figure out where to cut frames like that without having to specify all the stream parameters. I think you'd just need an offset from the header.
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