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Old 17th August 2019, 12:57   #57121  |  Link
mclingo
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Originally Posted by x7007 View Post
I have 1080 GTX now. I might move to AMD, any specific issues with Madvr and AMD drivers/Cards? or it's just same settings as Nvidia now
There are two minor issues I am aware of.

1 - I have an issue where colours/reds are blown out with SDR material sub 60hz, I have tried any of the new drivers so I dont know whether its fixed. You will only see it if you are setup for HDR / 10 bit though. This can easily be fixed though on my system by setting up madvr calibration to BT2020.

2. The is a bug in MADVR when using 3D, if your desktop is 4k and you play a 3D MVC movie, when it comes out of the movie and drops back to 4k you get HDMI loss, there are lots of ways around this.

Some people have reported banding in some situations, i've never seen any ever, I have a 2015 4k LG EF950v OLED.

I'm currently using a RX 580, its good for NGU high but I usually run it at medium or low in to keep heat and noise down, i generally find there is no distinguishable differce between high and low for me anyway.
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Old 17th August 2019, 12:59   #57122  |  Link
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Originally Posted by oldpainlesskodi View Post
Same here, I just pulled the trigger on a RX5700 XT...will be here later today...
i'd be really interested to know how you think this compares to a 1060 / 1080 in your opinion when you get chance, these seem to be the most popular cards on here for NVIDIA.
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Old 17th August 2019, 13:13   #57123  |  Link
oldpainlesskodi
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Will post some observations here tomorrow.
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Last edited by oldpainlesskodi; 17th August 2019 at 14:38.
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Old 17th August 2019, 16:14   #57124  |  Link
RealSnoopyDog
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How complicated is it, to add support for HLG (Hybrid Log Gamma)? This is another HDR format which is used with DVB transmissions to save bandwidth. And who needs to support it? Only madVR or the graphics card as well?
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Old 17th August 2019, 19:59   #57125  |  Link
nevcairiel
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Originally Posted by RealSnoopyDog View Post
How complicated is it, to add support for HLG (Hybrid Log Gamma)? This is another HDR format which is used with DVB transmissions to save bandwidth. And who needs to support it? Only madVR or the graphics card as well?
If madVR supported it, it could at least make use of the HDR data to create a better SDR image.

If you want the HLG data actually send out to the screen without madVR processing it to ordinary SDR, the graphics card would probably need to accept it as a valid mode. Luckily HLG has no extra metadata, so that might be easier.
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Old 17th August 2019, 22:00   #57126  |  Link
Alexkral
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For SDR output you can make a 3DLUT with DisplayCal.

Edit: You have the option of using the SMPTE 2084 roll-off with an HLG profile, but that probably won't work.

Last edited by Alexkral; 17th August 2019 at 22:22.
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Old 18th August 2019, 05:30   #57127  |  Link
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madVR doesn't read HLG yet and doesn't like HLG 3D LUT.
i just "convinced" madVR that this 3D LUT is fine just use it and it worked fine with an HLG source.
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Old 18th August 2019, 08:34   #57128  |  Link
YukonTrooper
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Is there any known cause for presentation glitches to accelerate over time? I've tried almost every option in the general settings page to no avail. Rendering times are ~10ms and there's no repeated or dropped frames.
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Old 18th August 2019, 15:13   #57129  |  Link
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You don't say what presentation glitches are occurring. You also need to tell us something about your system, such as what graphics card are you using, and how much video memory does it have?
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Old 18th August 2019, 15:15   #57130  |  Link
oldpainlesskodi
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Originally Posted by oldpainlesskodi View Post
Will post some observations here tomorrow.
Initial findings (summary)

Like:

1st ever time using an AMD card...love the black levels (picking up details in shadows and dark scenes that were never visible with the 1080) and PQ (appears cleaner,and yet more detail at the same time), and control over just about every aspect of PQ.

Using Wattman (auto overclock), the card is happy and stable at 2130. About 30% faster that my overclocked 1080 strix (render times).

Dislike:

Control over just about every aspect of PQ (for us types...oh well, even more obsessing)

Software not as intuitive as Nvidia.

Seems to throttle at a lower threashold (nivida on 23p, seems to be about 39 vs 32 ms)

HDR is better on Nividia because of the API links in Madvr (I assume) being able to tell the display its a Bt2020 signal.

Verdict - 1080 up on ebay over the next few days, but still have lots more testing and tuning to do.
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Old 18th August 2019, 15:37   #57131  |  Link
huhn
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there is no difference in black level this has been proven countless times using measurement hardware you are imagine things or your level settings are messed up.

can you make a screen with ShowRenderSteps would be nice to see AMD back with some NGU capable cards.
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Old 18th August 2019, 15:41   #57132  |  Link
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IIRC, AMD has (or used to have) some image improvement processing options enabled by default. Make sure you're not falling into a processing trap.
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Old 18th August 2019, 16:31   #57133  |  Link
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Just ordered RX5700 XT a few minutes ago.

Should be here in a hour. Can't wait.
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Old 18th August 2019, 16:49   #57134  |  Link
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oldpainlesskodi
Could you check HDR passthrough at 8 bit madVR output?
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Old 18th August 2019, 18:10   #57135  |  Link
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oldpainlesskodi
Could you check HDR passthrough at 8 bit madVR output?
I will check that for you.

Just got the video card around 30 minutes ago.
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Old 18th August 2019, 18:32   #57136  |  Link
DMU
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ng4ever, thank you.
I managed to output HDR-passthrough at 8 bit madVR output on my Vega using a profiles bug, but there is doubt that statistics show the truth.
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Old 18th August 2019, 18:40   #57137  |  Link
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Originally Posted by nevcairiel View Post
IIRC, AMD has (or used to have) some image improvement processing options enabled by default.
Isn't madVR supposed to bypass all those? (as long as you're not using DXVA processing in Trade quality for performance, of course)
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Old 18th August 2019, 19:17   #57138  |  Link
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You don't say what presentation glitches are occurring. You also need to tell us something about your system, such as what graphics card are you using, and how much video memory does it have?
I think I discovered the issue.

I started getting the presentation glitches when using my LG C9 @ 119Hz. I also have a 165Hz G-Sync display connected to the same system. Doing some searching, apparently there can be issues with two high refresh displays, despite using the "Second screen only" option in Windows.

I was able to reduce the presentation glitches by lowering the presented frames to low as 2, although they still occurred. I then tried disabling presented frames and using the backbuffer at default 3 without any presentation glitches. However, I only tested ~5 minutes of playback before going to bed. I'll try extended playback tonight and see if the backbuffer method is indeed truly the fix.

Still, any input is welcome. Maybe there's an optimal setup somebody is aware of I can jump straight to. I also still need to try 1 presented frame and much higher presented frames. Apparently very high presented frames fixed presentation glitches for someone in a similar scenario.

Also, I'm on Windows 1803 with a GTX 1070.
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Old 18th August 2019, 19:46   #57139  |  Link
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Man that sounds really similar to the issues we get on RTX cards. Try a present frames of 1 and see if that clears it up. Alternatively, turn D3D11 presentation off and use D3D9 and see if the problem goes away. I'd be curious how that works for you.
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Old 18th August 2019, 20:35   #57140  |  Link
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There's a note in NVIDIA's driver doc that stutter problems can arise when using multiple monitors with different refresh rates or GSync/non-GSync, maybe that's a case of that.
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