Devices > Video Cards, Monitors, Televisions, and Projectors

MC and MadVR incorrect scaling resolution (ROHQ)

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RoderickGI:
This is why I'm not using my 4K TV in 4K resolution. Too complex and fiddly. Too many different places to find settings that all interact with each other.

It would be nice if ROHQ just fixed all this stuff and made it work correctly. Most users won't even attempt 4K resolution, I'm sure. Or if they do, they will be tearing their hair out.

Hendrik:
Playing in 4K is just fine. The problem is when you switch the resolution and DPI scaling on the fly. If you would never change the resolution, or stay on the same DPI, you would not have any troubles. This also cannot really be fixed easily due to the way DPI scaling in Windows works.
Dealing with DPI changes is really complicated, especially since the method to do that changed a couple times in past windows versions, from 7 to 8.1 and to 10 (and only in some later builds of 10 at that).

If it was me, I would probably just accept that its super-sampling the image (ie. upscaling and downscaling), and tune the profile to make its performance acceptable. Super-sampling probably doesn't even hurt the quality.
Or use 4K SBS 3D, which may even have higher quality in the end.

4K and 3D just doesn't mix. There is no proper 3D mode in 4K, and most future 4K TVs won't even support 3D.

So several options I would see here:
- Convince Windows to use the same DPI on all resolutions. I do not know how to do that, but maybe its possible.
- Accept super-sampling, its the easiest and probably quality-neutral, just a slight performance cost (if the 3D effect looks "ok" in that mode?)
- Use 4K SBS/OU 3D if your TV supports it, which might even increase quality slightly, but does lose some of the automatic-switching magic

Manfred:

--- Quote ---This is why I'm not using my 4K TV in 4K resolution. Too complex and fiddly. Too many different places to find settings that all interact with each other.
--- End quote ---


Sorry - but I disagree  :)

4k here works without any problems with ROHQ and its really stunning on my LG OLED ;D ;D ;D

Important thoughts from my experience:
-use of NVIDIA GPU (intel iGPU on most mainboards does not support HDMI 2.0 and has problems with deinterlacing)
-use NVIDIA GPU for upscaling and not TV (much better latency and PQ)
-use MC for mode switching: "VideoClock enabled under General Video Settings in MC" and not madVR
-First use "Display Settings automatic change mode on" under VideoClock enabled under General Video Setting in MC
-HDR passthrough HDR content to the display (your TV must be 4k/HDR capable)
-scaling algorithm's: first use the the non AI algorithm's like Jinc, Bicubic, they work usually
-rendering general settings: use Direct 3D

Before you change something use ROHQ standard settings ( in the madVR directory there is a script "restore default settings") Path: "C:\Users\[YourUserId]\AppData\Roaming\J River\Media Center 24\Plugins\madvr"

RD James:

--- Quote from: Hendrik on May 28, 2018, 03:22:08 am ---- Convince Windows to use the same DPI on all resolutions. I do not know how to do that, but maybe its possible.

--- End quote ---
All that you have to do for this is to select the output resolution as your desktop resolution, and set the DPI scale for it. Windows remembers your choice.
 
Media Center has always had difficulty scaling properly on Windows 8.1 / 10 (never tried it on 7, anyone using DPI scaling on 7 hates themselves) and there are several issues with Media Center's own scaling options too.


--- Quote from: RoderickGI on May 28, 2018, 12:40:38 am ---This is why I'm not using my 4K TV in 4K resolution. Too complex and fiddly. Too many different places to find settings that all interact with each other.

It would be nice if ROHQ just fixed all this stuff and made it work correctly. Most users won't even attempt 4K resolution, I'm sure. Or if they do, they will be tearing their hair out.

--- End quote ---
That seems crazy to me.
Just set it to 2x scale for both 4K and 1080p, or whatever scale you prefer (though Windows handles integer scales best).
Or stop switching resolution and use side-by-side 3D if your TV supports that at 4K.

Hendrik:

--- Quote from: RD James on May 28, 2018, 05:01:27 am ---Media Center has always had difficulty scaling properly on Windows 8.1 / 10 (never tried it on 7, anyone using DPI scaling on 7 hates themselves) and there are several issues with Media Center's own scaling options too.

--- End quote ---

The DPI scaling works fine within the limits that Microsoft has on that system. We just don't support per-monitor DPI scaling, which would also be required to react to DPI scale changes. But per-monitor DPI is rather screwed up anyway, considering MS had to change it 2 more times since it was initially introduced in Windows 8.1 (it was changed in the first Windows 10 version and once again in 1607 i believe), so anyone mixing different DPIs is going to hurt somewhere.

Thats why I would personally try to avoid any DPI changes at all. Or if you really can't, just let madVR and the graphics driver perform super-sampling of 3D content.

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