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16th March 2019, 21:51 | #55361 | Link |
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@cybscott
Does it show banding even at rgb 444, 12bit @ 23/24 hz ? Sometimes it's the sharpening algorithm which screw up 4:2:2 conversion, leading to (banding), but it's not actually banding, it's just bad sharpening.
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17th March 2019, 00:20 | #55363 | Link | |
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Quote:
Some of the videos I watch have banding already in the source and some with little to no banding in the source. If I look at a scene that has little to no banding, running the Nvidia control panel at 12 bit with the appropriate display mode, it does NOT add any additional banding or video noise that was already part of the source. I don't typically use any additional sharpening algorithms beyond what is built into NGU-AA, which I use exclusively for my content. |
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17th March 2019, 00:50 | #55364 | Link | |
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17th March 2019, 01:30 | #55365 | Link |
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Re-read what I wrote, and that is clearly what I said in the context of my post. Remember we were discussing display modes. I also mentioned the BT2020 container, but maybe that's too technical
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17th March 2019, 01:56 | #55366 | Link |
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I suggest everyone running their LG Oleds at 12-bit or in PC-mode to check out Rtings 16-bit gradient test pattern played in madVR.
https://www.rtings.com/images/test-m...ent-16-bit.tif My LG C8 shows noticeable banding, especially visible in the darker green gradient when using either 12-bit or 8/12-bit PC-mode. In 8-bit, non-pc mode it looks fine. It was the same on my C6 so I don't really understand if something is wrong with my setup or if other people just don't notice the banding. By the way PC-mode also forces 3:2 pulldown even when outputting 23.976 Hz. So you get 4:4:4 chroma and lower input lag but you'll also get color banding and forced 3:2 pulldown. |
17th March 2019, 08:47 | #55368 | Link |
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So I spent the afternoon trying to get my JVC x7500 working without dropping/repeating frames and I think I've worked it out. The JVC is very picky about what signal it will accept and all the ones offered by madVR outside the normal ones did not work. So I started with the EDID / CTA profile (but it would have a drop/add about 1 per hour) and tweaked that a bit. While madVR's config GUI says this setting will last 7.79 hours, I can confirm it worked perfectly for just under 2 hours. Interestly, is that madVR kept updating the reported display calculation from 23.9758 @ 1 min, to 23.97608 but the end of the movie as well as the expect drop.repeat frames.
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17th March 2019, 09:25 | #55369 | Link |
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@jmone
Can you please tell us what you did to tweak your settings. I'm in a similar situation and would very much appreciate some guidance. I have read the tutorial found here: http://madvr.com/crt/CustomResTutorial.html Is it something similar you did? Best regards |
17th March 2019, 13:18 | #55371 | Link | |
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Here the values (frequencies) arenīt constant, they are e.g. temperature dependant. So when watching a movie and heating up your computer case these values will drift to a certain degree. So your custom resolution is more or less perfect now (as perfect as you can tune it) when drifting between a couple of hours and some days drop/repeat time. |
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17th March 2019, 13:45 | #55372 | Link | |
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Thanks - I'll keep it at 8 bit so when I have my JVC x9000 on it'll work with that too. |
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17th March 2019, 16:45 | #55373 | Link | |
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Are you talking about PC-mode on the LG, or pc-mode in NvidiaCP (hdmi intent) ?
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17th March 2019, 17:36 | #55374 | Link |
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I'm of course talking about PC-Input mode on the LG Oled, as that is the only way to get 4:4:4 chroma.
I also notice the banding on HDR gradient test pattern when using pc-mode or 12-bit so it's not a pattern issue. I'm not trying to prove anything here, use whatever you like. I was just a bit baffled that there are quite a few people using such a subpar setup. 4:4:4 chroma is nice but not at the cost of increased banding and 3:2 pulldown judder... |
17th March 2019, 18:42 | #55376 | Link | |
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I'm disappointed that UHD TVs that are supposed to be high end can't properly process 4:4:4 @ 4K without suffering those kind of quirks. This shows they have not yet reached the same maturity as the late high end 1080p displays (maybe in the 2019 models it will be fixed?).
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17th March 2019, 18:51 | #55377 | Link |
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PC input mode has always been somehow fu*ked up on LG Oleds. Some time ago I pretty much tried all the color/bit-depth combinations in pc-mode and while some were better than others, all of them produced worse gradients than the standard hdmi mode, especially in darker colors. Output was set to 24Hz, so surely this can't be a HDMI bandwidth issue.
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17th March 2019, 20:10 | #55378 | Link |
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It's very likely caused by their video processor (the a9 or whatever it's called). I have my doubts about the 2019 models fixing 12 bit banding issues or banding issues with PC mode. But we'll know in a few weeks when the first models are released I guess. I'm certainly not upgrading again any time soon.
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17th March 2019, 20:52 | #55379 | Link | ||
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However, I do like smooth motion more than 4:2:2 chroma. 4:2:2 chroma bothers me really a lot. Quote:
Also the input lag in non-PC mode is way too high for me, I need to start worrying about adding an audio delay, the mouse feels laggy, etc.
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17th March 2019, 21:03 | #55380 | Link |
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I didn't really test a lot of SDR content so I'm not really sure. I noticed it in HDR and ended up having to turn it off. I don't have the input lag issues you're seeing, though. But I have almost all processing turned off.
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Tags |
direct compute, dithering, error diffusion, madvr, ngu, nnedi3, quality, renderer, scaling, uhd upscaling, upsampling |
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