Devices > Video Cards, Monitors, Televisions, and Projectors

4K / HDMI 2.0 : What Colour Space & Bit Depth to use?

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jmone:
I'm trying to config my HTPC (GTX 1070) --> Yami A3060 --> JVC x7500 --> 125" screen for use with MC playing mostly BD and some DTV at this stage.

It seems that I have a couple of choices if I want to use MC/madVR to render at 4K:
1) Lets Windows/nVidia auto pick (but I've found the JVC uses different profiles depending of the Bit Depth PLUS I've had weird colours even freezes as it switches around esp with 3D)
2) Pick a Single Colour Space and Bit Depth in the nVidia Control Panel that will work well at all frame rates.  So, according to the following table, the only two choices that work at all frame rates would be either:
- RGB 8-Bit, or
- 4:2:2 12-Bit

Any Suggestions?  Does it even matter?

Thanks
Nathan

PS - At this stage my UHD content (UHD-BD) is coming from the X-Box One S, but the HTPC I've built can play it via PowerDVD but I've not bothered as I still have to put in a physical disc at this stage so may as well use the X-Box.

Manfred:
I am running LG 4K with GTX 960 since 1 year now:

RGB 4:4:4 will not work-> HDMI 2.0 has not the bandwidth to support this.

I have done the following:

If you have a 10 bit display you can configure it in madVr ->device>Properties. 10 bit will only work in fullscreen exclusive mode (rendering->general setting).
If your display supports this enable passthrough HDR content to the display (madvr->devices -> hdr)
Enable under devices->properties PC-Level colour space (0-255)

In the Nvidia Control panel I have confiured under Display:
32 bit Desktop clour space; 10 bit for the output depth; RGB for the format and full for dynamic .... (Ausgabebereich ist the german word)
YCbCr 4:2:0 (source bd)-> RGB (madVR)->RGB(NVidia)->Display

Under Video: Use the Video Player configs.

Get some test files from:

http://demo-uhd3d.com/categorie.php?cat=demouhd

I let my NVIdia card do full upscaling (no micro stutering in music concerts) to 4k instead giving e.g. 1080p to the display and let the display do the upscaling.

Daydream:
I still don't get it, and everything I read didn't help much. Sidenote: great job for whoever defined HDMI 2.0 standard; can't do anything right without dropping something (color, precision, framerate).

So, just like jmone, I wonder, for a Blu-ray UHD with HDR:
1) Dedicated hardware playback chain, no computers, no madvr: what's more important, color depth or color precision?
2) Same question for a computer playback, with madvr: what's more important, color depth or color precision?

Can the answer be quantified precisely or it depends on how far I am from the screen and how many Heineken's I had?

Slight detour from topic: how do you calibrate an HDR capable screen/projector for all media types? One profile for Rec2020 and one for Rec709? Are there even devices (TVs/projectors) that can save different calibration profiles like that? Per same input or different inputs? And the device cost less that $5000 (as a bonus)?

jmone:
I've not played any more.  I'm waiting on a NUL Modem cable and USB adapter to arrive (this week with luck) to do a firmware update on the PJ..... then I'll dive in more.  The issue with HDMI 2 is that it has a max data rate of 18gbps so you can not have 4K / 50or60fps / 10Bit / 4:4:4, you have to compromise on one of these factors.  I just don't know what is going to work best across both BD and UHD BD (with and without HDR) OR how to switch between profiles at this stage....

jmone:
Hoping Hendrik can provide some advice of the best way to setup MC for this.

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