UHD player with YUV420 output?

[Geoff D]

Originally Posted by s_har

Thanks. So basically there is no way to output the native 420 that's on disc as a 24p 10-bit HDR signal then I take it. Because that particular 'combination' doesn't exist as a standard is that it? It has to be 422 or 444 in order to have 24fps as an option?

Correct.

So if some of the splitter in my chain is rated as 420 capable only then that basically means there is no way I will be able to run a 24p signal through it? It will have to be upconverted from 24fps to 60/50fps (thus defeating my purpose)in order for the signal to pass through?

If your splitter can't handle greater subsampling than 4:2:0 even in 4K24 then I kinda doubt it'd have enough bandwidth to handle 4K50/60. It shouldn't even be a HDMI-branded device if it can't accept a 4:2:2 signal in any way, shape or form. Or this is some sort of Cat5 network doobrie or something?

[s_har]

Originally Posted by Geoff D

If your splitter can't handle greater subsampling than 4:2:0 even in 4K24 then I kinda doubt it'd have enough bandwidth to handle 4K50/60. It shouldn't even be a HDMI-branded device if it can't accept a 4:2:2 signal in any way, shape or form. Or this is some sort of Cat5 network doobrie or something?

It's just a regular HDMI splitter that's (from the look of it anyway) supposed to be UltraHD HDMI2.0 HDCP2.2 compliant.

According to the specs it is:

300MHz/10.2 Gbps bandwith

Output Resolution:
480i ~1080p50/60, 4Kx2K@24/30,
4k2k@60Hz with 12bit YCBCR 4:2:0

I guess it is that bandwith that is the limiting factor here that is causing it not to accept 4K@24p 10-bit HDR 422/444?
When I connect it to a UHD player the player kicks into dynamic range conversion mode which I assume is because the player detects it is connected to a device not capable of recieving the 422/444 signal?

[chip75]

Originally Posted by s_har

It's just a regular HDMI splitter that's (from the look of it anyway) supposed to be UltraHD HDMI2.0 HDCP2.2 compliant.

Does it convert HDR into SDR with all media (like demo videos from a USB stick)? perhaps it doesn't support HDR. Not all HDMI2.0 HDCP2.2 splitters do.

[s_har]

Originally Posted by chip75

Does it convert HDR into SDR with all media (like demo videos from a USB stick)? perhaps it doesn't support HDR. Not all HDMI2.0 HDCP2.2 splitters do.

I haven't tested it with anything else than UHD discs. I guess I just assumed since it's supposed to handle 4K@60p 12-bit 420 that it would also be able to handle a 4K@24p 10-bit HDR signal. Will try testing with demo video from USB stick tomorrow.

[chip75]

Originally Posted by s_har

I haven't tested it with anything else than UHD discs. I guess I just assumed since it's supposed to handle 4K@60p 12-bit 420 that it would also be able to handle a 4K@24p 10-bit HDR signal. Will try testing with demo video from USB stick tomorrow.

I would. I looked at them for another member and a lot of them don't support HDR. Do you know the model of the splitter?

The other issue with some splitters is if you input HDR, but can only one device can output it (say you have a projector (which doesn't) and a UHD TV that does), it can downgrade the signal automatically.

[s_har]

Originally Posted by chip75

The other issue with some splitters is if you input HDR, but can only one device can output it (say you have a projector (which doesn't) and a UHD TV that does), it can downgrade the signal automatically.

Thanks! This turned out to be the case! It seems the splitter is not the culprit at all. One of the connected displays it seems is not recognised as HDR compatible and so the UHD player kicks into dynamic range conversion and downgrades the signal for the whole chain. Even when disconnecting the incompatible display in question the player maintained the conversion output (which is probably why I wasn't able to pinpoint this as the problem before)

The solution it turns out is to simply start playback of the UHD disc with only the HDR compatible display connected to the splitter and then after playback is started connect the non-compatible display. When doing it that way the UHD player does not kick into conversion mode and instead maintains the full HDR signal.

[chip75]

Glad you got it sorted, mate.

[Geoff D]

Originally Posted by s_har

It's just a regular HDMI splitter that's (from the look of it anyway) supposed to be UltraHD HDMI2.0 HDCP2.2 compliant.

According to the specs it is:


I guess it is that bandwith that is the limiting factor here that is causing it not to accept 4K@24p 10-bit HDR 422/444?
When I connect it to a UHD player the player kicks into dynamic range conversion mode which I assume is because the player detects it is connected to a device not capable of recieving the 422/444 signal?

10.2Gb/s should not be a problem for 4K24 at up to 12-bit 4:2:2 at all. As chip said, if the dynamic range conversion is being triggered when you use the splitter with UHD then something else is going on, bandwidth isn't the issue.