Devices > Video Cards, Monitors, Televisions, and Projectors
MadVR banding
tij:
MadVR tone mapping algorithm is very complex (current beta version is even more complex) and requires quite powerful gpu
The topic of tone mapping is quite complex and I do not fully understand it ... suffice to say - trust your eyes and stick with what appeal to yoy as there is no definite standard for tone mapping ... so everything algorithm for it is subjective.
Its worth mentioning that another strength of MadVR is upscaling ... and for animation, NGU algorithms in MadVR can do wonders for 1080p to 2160p ... it looks like native 4k ...but NGU algorithms are quite GPU intensive
EDIT: see this ... https://yabb.jriver.com/interact/index.php/topic,126112.msg873894.html#msg873894 ... it has screen shot of 720p to 2160p upscaling using ROHQ(MadVR with NGU) vs RO Stsndard ... thecdifferences are astonishing
tij:
Regarding 8 vs 10 bit ... due to current HDMI limitation, in RGB (and RGB is what MadVR uses) you can only do 10/12bit at 23.976fps
On my HTPC with Nvidia 1070 ... i put my desktop on 12bit (I have LG E6) at 23.976 ... when required to auto switch to 60fps for certain movies, it automatically switch to 8 bit
If I put my desktop on 60fps 8bit ... when required to switch 23.976, bit depth remains at 8bit
So for me it was either having 12bit for movies, but not so smooth mouse movement VS 8 bit for movies, but with better mouse response ... I chose 12 bit, since on HTPC i dont use mouse (i use remote with Theatre View)
Regarding your screenshot:
You posted 3 cases with different DPI setting that resulted in MadVR scaling your 3840x2160
1. scaling to 2400x1350
2. scaling to 4800x1700
3. play natively at 3840x2160
Here are my observations:
(2) does not seems to be HDR movie as it reports REC709 color space. Are you sure you playing same file for all 3 cases? That might explain why MadVR able to render frame in time for such a high resolution, as it does not do tone mapping
with your current settings your GPU cannot tone map for full 2160p - case (3) ... try disabling MadVR HDR color tweaks for explosion and highlight recovery ... if that does not work, see what dithering option you have in MadVR options [rendering]->[dithering] and try to set it to lower quality
Your presentation queue is not filling up ... check amount of RAM you allocated to your GPU ... minimum is 4GB for 4K playback (if i recall correctly) ... if allocated RAM is good, then try updating your drivers
And finally ... regarding DPI ... given that your screens are 2160p and 1080p ... i find it very weird that 100% DPI gives you 4800x1700 ... how did you set up your two screens in Windows and at which resolutions?
In summary ... your GPU is a bit underpowered to tone map with MadVR at 4K ... I would just passthrough HDR to your TV for tone mapping (in fact I would just stick with RO Standard)
TheShoe:
nVidia drivers (or Windows?) will save the color bit-depth and format (YPbCr or RGB) for each resolution/refresh rate you set.
I can now run my desktop as 8-bit/RGB/full/2160p60, and when MC/madVR switches to 2160p23, it changes to 12-bit/RGB/full (for example) and when playback is stopped, it restores the desktop to 8-bit/Rgb/full.
With this I have a full RGB pipeline (excepting of course the video itself which is not RGB). The downside is that this caused me to have to fiddle with brightness/contrast/OLED light values for a while until dark scenes were not showing black crush. Got it dialed on now where the computer can support both my MC and Video gaming habits without having to muck around too much with settings.
Unless it's an HDR video game, then I need to enable Windows HDR (perfect for HDR in general, not so much for SDR content).
There honestly is *no* perfect setup here - too many variables
MediaMongrel:
Well, just a quick update on my NEW Lenovo laptop with integrated graphics not being able to play 4k movies without issues...
you were right Tij, the laptop just wasn't powerful enough. So, I returned shortly after we I last posted... and waited a whole 6 months for Lenovo's 5Pro to become available in N.America. Now I got a RTX 3060 w/ 16gb RAM, and 4k movies play smoothly.
Thank you for all the help you and other provided. :)
JoeAverage92:
--- Quote from: MediaMongrel on January 31, 2021, 09:39:29 pm ---Okay... so i went back and put all my MadVR settings as you suggested, Jmone... and the banding was as bad as it has ever been.
... my tv shows that it is still receiving just 8bit (after i do an Easter egg button combo to bring up a special window showing incoming signal info)...
--- End quote ---
What is the easter egg button combo to bring the "Incoming Signal Info" windows during playback? Thanks
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