madVR - high quality video renderer (GPU assisted)

[James Freeman]

Another 3DLUT and HDR bt2020 movie question;
Should I calibrate and profile at maximum brightness of my wide-gamut SDR monitor before creating a 3DLUT for HDR->SDR in madVR using my screen peak brightness setting?

It looks like the colors are desaturated when I calibrate to 100nit and set to 400nit peak in madVR.
But, when I set to 120nit peak in madVR with a 100nit 3DLUT the colors are accurately saturated.

Currently, the most accurate result I got is calibration+profiling in Wide-Gamut mode (Dell U2410) at 100nit, 3DLUT BT.2020 Gamma 2.2 in DisplayCAL, and 120nit peak in madVR.
I would assume it would be most accurate to set madVR peak nits at the same peak nits of the calibration, correct?

EDIT:
Found a better solution, HDR->SDR by 3DLUT, it does a better job than by pixel-shader, but by pixel-shader is not bad at all.
It's been almost 2 years since my last calibration and DisplayCAL use, so I'm a little rusty.
The solution was on AVSForum in the "MadVR - ArgyllCMS" thread... obviously.

[huhn]

Originally Posted by James Freeman

Another 3DLUT and HDR bt2020 movie question;
Should I calibrate and profile at maximum brightness of my wide-gamut SDR monitor before creating a 3DLUT for HDR->SDR in madVR using my screen peak brightness setting?

if your screen isn't getting into troubles using high brightness you could try it. setting into below 300 nit is generally not a good idea IMHO.

It looks like the colors are desaturated when I calibrate to 100nit and set to 400nit peak in madVR.
But, when I set to 120nit peak in madVR with a 100nit 3DLUT the colors are accurately saturated.

Currently, the most accurate result I got is calibration+profiling in Wide-Gamut mode (Dell U2410) at 100nit, 3DLUT BT.2020 Gamma 2.2 in DisplayCAL, and 120nit peak in madVR.
I would assume it would be most accurate to set madVR peak nits at the same peak nits of the calibration, correct?

while it is accurate it is pretty pointless to get the 100 nit part of on HDR file accurate.

when a movie is capture in HDR and put on a normal BD you can blindly assume they don't do it this way.

[James Freeman]

Originally Posted by huhn

if your screen isn't getting into troubles using high brightness you could try it. setting into below 300 nit is generally not a good idea IMHO.

My train of thought is;
Wouldn't it result in more accurate colors if I actually calibrate to my displays maximum backlight brightness, instead letting DisplayCAL do-the-math and calculate/stretch from 100nit to whatever HDR peak nit I select?

I shall continue this discussion on the AVS thread.

[Asmodian]

Yes, never target a specific brightness with a calibration. It is always better to target native brightness and use the display's brightness control to adjust it if necessary.

[James Freeman]

So, calibrate to 100nit and let DisplayCAL or madVR (pixel shader) do the math?

[johnnylaiyee]

When playing 1080p 8bit video is there a difference using nv12 output and p010 output?

[ryrynz]

If there was a benefit everyone would be outputting p010. So there's either no benefit and a small loss in performance due to conversion or there's a decline in quality and also a performance cost.
Neither of which you want, I'm sure someone else will chime in on which one it is, but obviously you should just keep the LAV defaults.

[James Freeman]

Dithered 8bit can easily look like 12bit to the human eye, especially when the dithering changes each frame like in madVR.

Also in my experience, consumer SDR TVs handle 12bit HDMI much worse than 8bit HDMI because the internal processor is designed around 8bit, even though they support 12bit.

[clsid]

Most 10bit videos that are available today were encoded from 8bit video!!! The reason that 10bit was used is purely because that allows for more efficient encoding in terms of quality/size ratio, at the cost of slower encoding and decoding. Going back to 8bit (with dithering) after decoding doesn't give much loss in quality.

Only "real" 10bit content such as HDR stuff make proper use of a wider color range. But even then the loss is small. Plus keep in mind that most TVs and monitors are 8bit internally (or even less).

[dioxholster]

btw, if you go to display settings -> display adapter properties, but it does not open, then madVR wont work either. Windows 10 since creators update has messed up ICC profiles and madvr needs to access them somehow. Is there a solution to this other than restarting PC?

[ipanema]

I'm just starting to try madVR in graphstudionext. I'm connecting the LAV splitter and decoder to it. I'm using Windows 7.

When the input pin of madVR is connected, a dialog box appears that says:

File Open - Security Warning
Do you want to run this file ?
...\madHcCtrl.exe

with Run and Cancel buttons.

The madHcCtrl.exe file seems to be the configuration gui for madVR. If I click "Run" to allow it to run, nothing seems to happen - the gui window does not appear.

It seems a bit strange that madVR tries to run the configuration gui just because the input pin is being connected - is this normal behaviour ?

It seems a bit pointless, especially when the gui doesn't even appear.

[Warner306]

I am helping a user with the following issue. Frames keep repeating creating judder.

Video of problem here: https://www.youtube.com/watch?v=xRvmy2bM8i8

Quote:

This is in DSPlayer. Some movies/video will do it, some wont. This is a 23.976 movie, but it does the same with a 50fps video file I have. I've just tested with MPC-HC with the 50fps video file... It's ok in full screen, but the problem appears in window mode. Meanwhile, the same 23.976 movie I've uploaded to youtube does the exact opposite (ok in window mode, haywire in full screen).

hardware/software:
windows 10 pro creator's update 64bit
mpc-hc / dsplayer,lav, reclock all in 32bit
Intel i5 4670k
intel HD 4600
Toshiba HDTV 46G310U

Thanks,
Max

Edit: Ok, manually switching to 23p in intel hd graphics control panel does the trick for the 23.976 movie. Weird. Switching it to 50p for the 50p file doesn't solve the window glitch however. I did input 1080p23, 1080p24, 1080p50, 1080p59, 1080p60 in diplay settings in madvr.

[Asmodian]

Originally Posted by ipanema

It seems a bit strange that madVR tries to run the configuration gui just because the input pin is being connected - is this normal behaviour ?

It seems a bit pointless, especially when the gui doesn't even appear.

Did it show up in system tray? The GUI loads minimized.

[nevcairiel]

Originally Posted by ipanema

It seems a bit strange that madVR tries to run the configuration gui just because the input pin is being connected - is this normal behaviour ?

This is perfectly normal behavior. You should probably tone down whichever "security" app you use.

[ipanema]

Thanks. It seems to start up in the tray, and then exits when the madVR is destroyed.

The dialog is not from a security application, it's the standard Windows warning when an unknown exe is executed. Un-ticking the "Always ask before opening this file" gets rid of future warning dialogs for the madHcCtrl.exe

Thanks again.

[70MM]

I use JR with madvr and it has a section were it automatically selects the different frame rates which I have ticked.
Do I also have to select 1080p23, 1080p24, 1080p50, 1080p59, 1080p60 in display settings in madvr?

If so and since I play everything back in 4K, do I have to write them differently?

[johnnylaiyee]

Originally Posted by 70MM

I use JR with madvr and it has a section were it automatically selects the different frame rates which I have ticked.
Do I also have to select 1080p23, 1080p24, 1080p50, 1080p59, 1080p60 in display settings in madvr?

If so and since I play everything back in 4K, do I have to write them differently?

I prefer Madvr's framerate control. You can type 2160p23 to work in 4k.

JR's framerate control sometimes crashes the playback for me.

[70MM]

So do you leave JRs frame rate switched to auto on or off with using the one on madvr?

So is this what I would do in madvr since everything is scaled to 4k?
2160p23, 2160p24, 2160p25, 2160p50, 2160p30, 2160p60, is that all?

[johnnylaiyee]

Originally Posted by 70MM

So do you leave JRs frame rate switched to auto on or off with using the one on madvr?

So is this what I would do in madvr since everything is scaled to 4k?
2160p23, 2160p24, 2160p25, 2160p50, 2160p30, 2160p60, is that all?

I leave the JR's settings to off.

And yea, those are good enough for all kinds of 4k playback.

BTW, do you use the video clock feature in JR?

[70MM]

Yes i have always used video clock in JR and it seems to work fine...