Devices > Video Cards, Monitors, Televisions, and Projectors

madVR able to output non-HDMI 2.0 (HDR) Video Mode?

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tij:
By “sparkles” you mean random white dots on screen ... if it is, then your HDMI cable does not have enough bandwidth to do 2160p in RGB (or 4:4:4) at 60Hz. Problem range from sparkles to completely blank screen.

I went through same problems on my C6 and E6. Finally after several so called HDMI 2.0 cables I got certified one and problem went away.

Why you want to run RGB (or 4:4:4) instead of 4:2:0 that Blu-ray Disc use of 4:2:2 that bluray players output? Because you want MadVR to do chroma upsampling instead of TV. That’s the whole pint of MadVR.

If you output from PC to E6 in 4:2:2, MadVR will do its scaling in 4:4:4 ... then downsample to 4:2:2 to match your output setting ... then your TV will do upsampling to 4:4:4 again.

That been said ... I run my desktop in 60hz for screen to be more responsive (in 1080p for 3D to work automatically ... that’s another story) ... and let MC switch refresh rate to match content (also let MC switch to 2160p for 2D content ... but as said before, completely different topic) ... but all in 4:4:4

Jong:

--- Quote from: tij on February 21, 2018, 08:07:46 am ---By “sparkles” you mean random white dots on screen ... if it is, then your HDMI cable does not have enough bandwidth to do 2160p in RGB (or 4:4:4) at 60Hz. Problem range from sparkles to completely blank screen.

I went through same problems on my C6 and E6. Finally after several so called HDMI 2.0 cables I got certified one and problem went away.

Why you want to run RGB (or 4:4:4) instead of 4:2:0 that Blu-ray Disc use of 4:2:2 that bluray players output? Because you want MadVR to do chroma upsampling instead of TV. That’s the whole pint of MadVR.

If you output from PC to E6 in 4:2:2, MadVR will do its scaling in 4:4:4 ... then downsample to 4:2:2 to match your output setting ... then your TV will do upsampling to 4:4:4 again.

That been said ... I run my desktop in 60hz for screen to be more responsive (in 1080p for 3D to work automatically ... that’s another story) ... and let MC switch refresh rate to match content (also let MC switch to 2160p for 2D content ... but as said before, completely different topic) ... but all in 4:4:4

--- End quote ---
Yeah, I get the cable is not coping.

The point is that it does cope @4K/60 RGB 8-bit and YCbCr 4:2:2 12-bit, i.e. 18Gbps. The problem is with 60fps HDR10 content the driver seems to be outputting an illegal 4K/60 RGB 10-bit that would require 22.3Gbs, more than any HDMI 2.0 cable or equipment is spec'd for.

We really do need to use YCbCr 4:2:2 if we want to do HDR10 at all refresh rates, because there is no HDR10 capable 4K/60 RGB video mode in HDMI 2.0. I know it involves more YCbCr->RGB>YCbCr conversions but sadly it's unavoidable at the moment. It was only an accident I happened to test with RGB. Now I understand it looks like a driver bug and nothing to do with MadVR or MC :).

Hendrik:
For the record, on most TVs you can do HDR also with RGB 8-bit, which should still have decent quality.

Jong:
Yes, thanks. For the limited amount of 50/60Hz HDR material I  could probably live with that and that's I guess what the driver should be sending for 4K/60 RGB. But I wouldn't want to use it unnecessarily for all HDR and it's not workable if the driver outputs 10-bit RGB for 24fps AND 50/60Hz.

But I'll try a full driver reinstall and if that doesn't fix it hopefully a future driver update will.

tij:
hmmm ... i never came across 2160p at 60fps material

NVIDIA control panel does not allow switching RGB 10bit 2160p60/50 on my 1070 connected to E6 ... so its surprising that MadVR/MC supposed to be able to do so

i supposed you can create profile in MadVR to run 2160p50/60 in D3D9 as that only outputs 8 bit

or profile for E6 properties that say it support only 8 bit for 2160p50/60 content

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