Devices > Video Cards, Monitors, Televisions, and Projectors

UHD 4K Blu-ray disc playing with "8-bit HDR"

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madbrain:
Reposting since the last post didn't make it, likely because of attachments.

When I play a UHD 4K Blu-ray disc in MC25 on my HTPC, specifically "Star Wars: Last Jedi" with an nVidia GTX 1050Ti GPU, JRiver switches the video mode to 2160p/24 Hz, and the "HDR" icon appears on my Optoma UHD65 projector soon after the mode switch.

However, I took a closer look at at the HDMI signal information using my Marantz SR-7011 receiver menu, and it showed that the signal is "4K:24 Hz, BT.2020 RGB, 8 bits". In other words, this is 8-bit HDR. See the first attachment.

If I play the same disc in my Sony UBP-X800 UHD BD player, the receiver says the HDMI signal is "4K:24 KHz, BT.2020 YCbCr, 12 bits", which is closer to what you would expect.

The colors look significantly different and better in the movie from the Sony player. I actually made an ISO backup of the disc to play in MC25, and froze the movie at the same section in both the Sony player with the physical disc, and with MC25 on the HTPC. I paused both around the same time (though not exact frame, but close), and switched inputs on the remote, and I can tell the same static frame has more contrast coming from the Sony. The projector is using identical settings for both cases, the so-called "HDR mode" preset.

Question :

How can I tell get MC25 to play HDR movies in either 10 or 12 bits as opposed to 8 bits ?

Relevant software settings :
a) In the nVidia control panel "change resolution" tab, I have it set to 3840x2160 at 60 Hz. The color settings are left to "Use default settings". When I look at the HDMI signal on the receiver, I can see that it the signal is "4K:60 Hz RGB 8 bits".
Do I need to change the system color settings to match the movie ? I was expecting MC25 to set those appropriately during the mode switch.
b) I have "Windows HD color" turned off in Windows Display settings. Do I need to set the desktop to HDR mode also to play HDR movies in MC25 ?
c) In MC25 video settings, I am using "Red October HQ" with default MadVR settings.
I have tried tuning a few things, such as :
- setting the "native display bidepth" to "10 bits (or higher)"
- changing the HDR setting to "passthrough HDR content to the display"
Neither resulted in any change in behavior. The output HDMI signal is still "4K:24 Hz, BT.2020 RGB, 8 bits".

Can somebody please help ?

Full hardware/software specs :

My hardware :
Asus Prime X470 Pro motherboard
AMD Ryzen 2700 CPU
16GB DDR4-2666
nVidia GTX 1050Ti 4GB video card
Hauppauge quad-HD tuner card (4 ATSC tuners)
Hauppauge HVR-1850 tuner card (1 ATSC tuner)
Aquantia AQN-107 10Gbe NIC

Audio :
Marantz SR-7011 receiver

Display :
Optoma UHD65 4K projector

Software :
Win10 x64 build 1909
JRiver MC 25 x64 25.0.115
nVidia drivers 445.87

I have also attached screenshots of the display identification and raw EDID data in MadVR.

madbrain:
Capture of HDMI signal info from MC25 as shown by SR-7011 receiver.

madbrain:
Capture of HDMI signal info from Sony UBP-X800 player as shown by SR-7011 receiver.

madbrain:
EDID info attached.

stewart_pk:
I think your Windows desktop setting is probably 8 bit.
MadVR converts to RGB so having your desktop set to YCbCr there will be a conversion back by your video card.
The best way to watch HDR 4K content from MadVR is to configure it to do dynamic tone-mapping if your GPU can handle it.
Projectors are not HDR devices but if yours has dynamic tone-mapping built in and switched on then it's probably going to be easier and more straight forward to send it HDR.

https://www.cnet.com/news/why-you-shouldnt-expect-great-hdr-from-a-projector/

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