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Old 23rd July 2018, 12:19   #51801  |  Link
mclingo
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had another look at my delay, yeah so I forgot to mention that all my disks are spun spun down to save power / reduce heat so spinning them up when i play a movie adds to my delay.

doh...
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Old 23rd July 2018, 19:34   #51802  |  Link
neo2018
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I have a 103" 2:35:1 screen, and my projector can crop the black bars, and some of the top/bottom/side content, so i can have the same image on 16:9 or 2:35:1 films:


Is it possible to do something similar with madVR?
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Old 23rd July 2018, 20:11   #51803  |  Link
huhn
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yes.
device -> "device name" set to digital projector
-> screen config
and processing -> zoom control
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Old 23rd July 2018, 22:30   #51804  |  Link
neo2018
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Perfect, thank you!
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Old 23rd July 2018, 23:52   #51805  |  Link
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Hey all, I have what I hope is a simple question. I'm now on a 4K LG OLED and I have the gamma set to BT.2020. What should I set for gamma in madvr to match that? I know this is total newbie land here but I'm still learning about the 4K world. Thanks!!!
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Old 24th July 2018, 01:04   #51806  |  Link
huhn
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bt 2020 is not a gamma curve it is a colorspace a "gamut".
no screen can show it not even professional ones.

if you don't have calibration equipment leave it at default.even if you select something like DCI P3 which is nearly doable on these screen you wll not get DCI P3.
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Old 24th July 2018, 01:15   #51807  |  Link
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That's what I get for doing things from memory and not looking. You are correct, that's colorspace.

Gamma: BT.1886

That is what I meant to say.
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Old 24th July 2018, 02:32   #51808  |  Link
wnholt01
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12 bit RGB not sticking

This isn't a madVR problem specifically I think, but I encounter it when using madVR with resolution switching. Anyone else use RGB 12 bit for 4K 23.976 with Nvidia card and have a problem getting the 12 bit to stick. Works fine if I leave in 23.976, but when switching between 23.976 and other refresh rates like 60 every once in awhile RGB for 4K 23.976 switches back to 8 bit, which of course screws up HDR until manually toggling back to 12 bit.
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Old 24th July 2018, 02:57   #51809  |  Link
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Yes, this is a known issue with current Nvidia drivers.

Try 382.53 or 385.28.

edit: It doesn't have to mess up HDR though, my LG OLED (C7) handles 8 bit HDR even better than 10 bit HDR (less banding, madVR's dithering is better than the TVs - or something).
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Old 24th July 2018, 03:13   #51810  |  Link
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I'm seeing the same with 8bit on my C8. Working very well with HDR.
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Old 24th July 2018, 04:14   #51811  |  Link
huhn
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Quote:
Originally Posted by SamuriHL View Post
That's what I get for doing things from memory and not looking. You are correct, that's colorspace.

Gamma: BT.1886

That is what I meant to say.
that't a gamma choicen on the black level of a display a oled should respond with a 2.4 gamma in that setting but they obviously don't do that.

but no matter what you change as a gamma setting there is nothing to change in madVR.
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Old 24th July 2018, 05:14   #51812  |  Link
wnholt01
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Quote:
Originally Posted by Asmodian View Post
Yes, this is a known issue with current Nvidia drivers.

Try 382.53 or 385.28.

edit: It doesn't have to mess up HDR though, my LG OLED (C7) handles 8 bit HDR even better than 10 bit HDR (less banding, madVR's dithering is better than the TVs - or something).
Thanks. I know 8 bit HDR is technically supported but I thought it wasn't recommended. For some reason image goes mostly pink when sending RGB 8 bit HDR to my JVC projector. Good to know it isn't caused by a limitation of 8 bit HDR.
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Old 24th July 2018, 07:23   #51813  |  Link
Asmodian
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Yes, I think that is due to the projector not handling it correctly, because all HDR capable hardware players output 10+ bits, rather than a limitation of HDR itself. You do need good dithering to avoid banding with 8 bit HDR content, something that does not live through compression (like the HEVC on a UHD bluray) but does for madVR's output or video games.

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that't a gamma choicen on the black level of a display a oled should respond with a 2.4 gamma in that setting but they obviously don't do that.
Interestingly I do not measure a notable difference between my LG C7's 2.4 and BT.1886 settings, but they are not exactly pure power 2.4 near black either (it actually rises slower, I think to make shadows look very deep). The 2.2 setting is pretty close to 2.2 though.
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Old 24th July 2018, 13:31   #51814  |  Link
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Quote:
Originally Posted by huhn View Post
that't a gamma choicen on the black level of a display a oled should respond with a 2.4 gamma in that setting but they obviously don't do that.

but no matter what you change as a gamma setting there is nothing to change in madVR.
Good to know thanks. Like I said I'm still learning on this 4k stuff so I'll probably ask a bunch of stupid questions while I get it dialed in. Thanks for your patience!

Sent from my Pixel XL using Tapatalk
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Old 24th July 2018, 16:41   #51815  |  Link
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Quote:
Originally Posted by wnholt01 View Post
Thanks. I know 8 bit HDR is technically supported but I thought it wasn't recommended. For some reason image goes mostly pink when sending RGB 8 bit HDR to my JVC projector. Good to know it isn't caused by a limitation of 8 bit HDR.
It's not caused by a limitation of 8bits HDR, it's a bug in the JVCs.

The only thing you need to do to get the JVC to work with HDR 8bits, as reported a few times, is to disable "Send HDR Metadata" if using passthrough, or use the HDR to SDR conversion wiht Pixel Shader.

The magenta bug in the JVCs is far worse with recent nVidia drivers. It's only at 4K60p with 385.28 while it's all 8bits modes with the more recent ones. So it could be nVidia rather than JVC.
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Last edited by Manni; 24th July 2018 at 16:48.
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Old 25th July 2018, 23:07   #51816  |  Link
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Couple questions about optimizing madVR

I'm trying to optimize madVR playback to avoid dropped and repeated frames. I *think* this boils down to subjects:

1) are there any obvious background processes that one should disable for a dedicated HTPC? I can't be sure that this is part of the problem, but I'm guessing it certainly wouldn't hurt.

2) My HTPC desktop runs at 3840x2160 23.979 (nVidia 1060 driver v385.28, running Kodi DSPlayer) so I don't have to change resolution (and experience HDMI handshake with my JVC projector) when playing movies.

I cannot get it to run at 23.976. I've tried custom resolutions specifying 23.976 to no avail. I've been told that only Intel graphic cards will do 23.976. If this is true, I will have to live with a frame repeat every so often and so be it, but can someone confirm?

Thanks in advance.
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Old 25th July 2018, 23:42   #51817  |  Link
huhn
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1. shouldn't affect repeated dropped frames.

2. read this: http://madvr.com/crt/CustomResTutorial.html
getting 23.976 is not the point of this.
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Old 26th July 2018, 00:23   #51818  |  Link
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I get a very nice ~1 day between drops/repeats estimated (with no drops/repeats during playback) with an Nvidia GPU, drivers 398.36, Windows 10, and a custom resolution (added and tuned by madVR) for my LG C7. It is possible on something besides Intel.
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Old 26th July 2018, 00:29   #51819  |  Link
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As someone who has spend about a decade being annoyed by this (eventually giving up and speeding things up to 24fps for about 4-5 years) my main advice would be do not overthink it, and use your eyes as the judge, not an OSD reporting frame drops/repeats.
Driver 390.70 and an optimised custom res was what i stuck with for most of 2018, a nice little custom res that only dropped a frame every couple of days,but every driver after that the sane custom res (Created within MadVR) would fail.

Recently Nvidia fixed their drivers and 398.36 has proper 23.976 support after years of 23.970, and from a few weeks of testing i think its great. OSD did trigger my OCD with the reported drop every 12-13mins, but i can't see it and i have really looked

Browsing this thread, i've saw that JVC projecters and newer Nvidia drivers may have issues so that may not be an option, but 385.28 should be good if you let MadVR optimise for 30-60mins and afterwards you have a good selection of custom resolutions to test.

Again, as someone who used to get overly techincal but has fallen behind with old age, my main advice would have minimal exposure to any OSD or stats.

Last edited by Redemption80; 26th July 2018 at 00:33.
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Old 26th July 2018, 06:38   #51820  |  Link
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Quote:
Originally Posted by Asmodian View Post
I get a very nice ~1 day between drops/repeats estimated (with no drops/repeats during playback) with an Nvidia GPU, drivers 398.36, Windows 10, and a custom resolution
8 bit or 10/12 bit?

I just updated to 398.36 to see if it works with my 1080ti, but when I create a custom resolution it always switches to 8 bit.

Last edited by Q-the-STORM; 26th July 2018 at 07:55.
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