2018 LG OLED Calibration and User Settings (No price talk) - Page 119 - AVS Forum | Home Theater Discussions And Reviews
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post #3541 of 3682 Old 10-11-2019, 03:10 PM
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The file I attempted to upload was this one.
https://drive.google.com/file/d/0B4P...w?usp=drivesdk
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post #3542 of 3682 Old 10-11-2019, 03:16 PM
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(sorry, permissions were not correct, link should be accessible now)
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post #3543 of 3682 Old 10-11-2019, 03:22 PM
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Quote:
Originally Posted by theMule View Post
The file I attempted to upload was this one.
https://drive.google.com/file/d/0B4P...w?usp=drivesdk
# Dolby Vision User Display Configuration File
# Generated by 5.10.1.94 on 09/10/2019
# Display: Unspecified
# DM Version: PictureMode = 2

Tmax = 82.0471018023889

Tmin = 0.0987477920507978

Tgamma = 2.2

ColorPrimaries = 0.6388 0.3296 0.3018 0.5968 0.1503 0.0598 0.3127 0.3290

TLMS2RGBmat = 5.56301890803598 -4.73516283975434 0.172143931718353 -1.12664387167798 2.29358151062817 -0.166937638950187 0.0267383125575747 -0.194631654700156 1.16789334214258

-------------------------------

Your file is correct for 2018 LG but it has wrong data for gamut, black, white.

Tmax is panel peak white, so its 82 nits only. (it should say 700-800 nits)

Tman is your black level, which is high.

Color primaries are closer to REC.709 and its not the panel native (wider) from these numbers.

So based to these numbers the 3x3 matrix to LMS colorspace should be wrong.

But normally, the TV should not be bricked when wrong numbers are send.... just the picture should be wrong only.

But why these colors are measured so wrong? It's something you have to talk with CalMAN guys.

CalMAN guys have to talk with LG to explain or see if they can help with repair.

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post #3544 of 3682 Old 10-11-2019, 03:26 PM
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Quote:
Originally Posted by theMule View Post
The file I attempted to upload was this one.
https://drive.google.com/file/d/0B4P...w?usp=drivesdk
Thanks. To aid discussion:

Code:
# Dolby Vision User Display Configuration File
# Generated by 5.10.1.94 on 09/10/2019
# Display: Unspecified
# DM Version: 
PictureMode = 2
Tmax = 82.0471018023889
Tmin = 0.0987477920507978
Tgamma = 2.2
ColorPrimaries = 0.6388 0.3296 0.3018 0.5968 0.1503 0.0598 0.3127 0.3290
TLMS2RGBmat = 5.56301890803598 -4.73516283975434 0.172143931718353 -1.12664387167798 2.29358151062817 -0.166937638950187 0.0267383125575747 -0.194631654700156 1.16789334214258
Tmax is only 82 nits. That's bonkers. But there's nothing there that should crash the TV, so perhaps it is something else that went wrong.

For comparison my file was

Spoiler!

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post #3545 of 3682 Old 10-11-2019, 03:29 PM
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Quote:
Originally Posted by mrtickleuk View Post

DolbyVision_UserDisplayConfiguration.txt
Code:
# Dolby Vision User Display Configuration File
# Generated by 5.10.1.93 on Sun 22 Sep 2019
# Display: Unspecified
# DM Version: 
PictureMode = 2
Tmax = 767.285864176409
Tmin = 0.0584981874024893
Tgamma = 2.2
ColorPrimaries = 0.6767 0.3218 0.2564 0.6783 0.1435 0.0508 0.3127 0.3290
TLMS2RGBmat = 4.13278785827531 -3.25438374754227 0.12159588926696 -0.915692432990774 2.05735316734118 -0.141660734350405 0.0552561805226776 -0.131072834622251 1.07581665409957
DolbyVision_UserDisplayConfiguration_2019.txt
Code:
# Dolby Vision User Display Configuration File
# Generated by 5.10.1.93 on Sun 22 Sep 2019
# Display: Unspecified
# DM Version: 
[PictureMode = 2]
Tmax = 767.285864176409
Tmin = 0.0584981874024893
Tgamma = 2.2
TPrimaries = 0.6767 0.3218 0.2564 0.6783 0.1435 0.0508 0.3127 0.3290
Why your Tmin is 0.05 nits?

Is your black level 0.05 nits?

As the i1Display PRO can't read the native OLED black and returns x: 3.3333 y: 3.3333 Y: 0.000, the Tmin value should be '1E-11' (0.00000000001 nits)

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post #3546 of 3682 Old 10-11-2019, 03:33 PM
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In fact I was just trying to understand how all the functionality worked, since I don't have the means to generate Dolby vision test patterns at the moment. So I just jumped to the end of the workflow and created/uploaded the Dolby vision config file, knowing/assuming it would be badly wrong, but with the intention to do a factory reset afterwards.

Indeed I was not expecting it to brick the TV. (If the values are crazy, this would be an example of bad error handling

I also would expect (and now hope for personal reasons ) some better hardware driven reset or recovery options, considering the presence of both physical buttons and usb ports on the back of the TV.
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post #3547 of 3682 Old 10-12-2019, 01:28 AM
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Quote:
Originally Posted by theMule View Post
Help! I tried to upload a dolby vision configuration file to my C8 using Calman LG Home, and immediately after doing that, the tv shut itself off and entered some kind of boot loop. Now as soon as it's plugged in it tries to turn on, then a few seconds later I hear the relay click and it repeats.

I can't access the menu to do a factory reset.

I assume there was something wrong with the dolby vision configuration file I uploaded somehow and the TV doesn't like it. Any suggestions how to bypass this/upload a new file/trigger a factory reset/etc?
Try disconnecting all you HDMI, unbranching, trying powering up with button (or waiting 30 minutes).

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post #3548 of 3682 Old 10-12-2019, 01:32 AM
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What do you mean by "unbranching"?

The TV attempts to power itself up immediately on being plugged in.
(I have it unplugged for the moment since otherwise it will be in an endless loop and making an annoying clicking sound from the power relay every few seconds)
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post #3549 of 3682 Old 10-12-2019, 07:01 AM
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Quote:
Originally Posted by ConnecTEDDD View Post
Why your Tmin is 0.05 nits?

Is your black level 0.05 nits?
Sorry Ted I don't know and can't remember. I was only trying to help @theMule . We discussed this recently - I made a mistake in the settings in Calman, I'm going to re-do it anyway.

Quote:
As the i1Display PRO can't read the native OLED black and returns x: 3.3333 y: 3.3333 Y: 0.000, the Tmin value should be '1E-11' (0.00000000001 nits)
I've never seen my C6-HDR2000 do that. Every time I have ever read "black" I get a real value, but I do now remember seeing the 3333 stuff ages ago on my previous LED-LCD tv. I am assuming that you mean Calman knows that this is black when it gets these values back from the meter, and replaces them correctly.


Quote:
Originally Posted by theMule View Post
What do you mean by "unbranching"?

The TV attempts to power itself up immediately on being plugged in.
(I have it unplugged for the moment since otherwise it will be in an endless loop and making an annoying clicking sound from the power relay every few seconds)
I think by "unbranching" he probably means unplugging from the electricity (as you have done).

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post #3550 of 3682 Old 10-12-2019, 11:41 AM
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Quote:
Originally Posted by mrtickleuk View Post
I've never seen my C6-HDR2000 do that. Every time I have ever read "black" I get a real value, but I do now remember seeing the 3333 stuff ages ago on my previous LED-LCD tv. I am assuming that you mean Calman knows that this is black when it gets these values back from the meter, and replaces them correctly.
As OLED has zero black, when you measure with i1Display PRO or C6-HDR2000, it will return a read error, in CalMAN you will see x/y: 0.333 Y: 0, in LightSpace you will see x/y/Y: 0.

Its normal to see all the time 0.333 xy and Y 0 nits in CalMAN when you measure your black level, unless you don't have 0 nits black...if its above about 0.0025 - 0.003 nits; which is the lowest i1Display PRO can read; then you will see different x/y values from 0.333
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post #3551 of 3682 Old 10-14-2019, 03:34 AM
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Quote:
Originally Posted by theMule View Post
What do you mean by "unbranching"?

The TV attempts to power itself up immediately on being plugged in.
(I have it unplugged for the moment since otherwise it will be in an endless loop and making an annoying clicking sound from the power relay every few seconds)
Yes, I meant unplugging, but you are right, it is obvious you have done that. If you t have also all your HDMI unplugged, I am afraid, you have to call assistance ....

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post #3552 of 3682 Old 10-17-2019, 01:50 PM
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Ooh. I hope we get to see this uploaded to their YT channel!

https://twitter.com/TylerPruitt/stat...04154042355712
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post #3553 of 3682 Old 10-17-2019, 05:17 PM
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2018 LG OLED Calibration and User Settings (No price talk)

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Originally Posted by mrtickleuk View Post
Ooh. I hope we get to see this uploaded to their YT channel!



https://twitter.com/TylerPruitt/stat...04154042355712


It is being recorded, so hopefully the post production turnaround is quick.
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post #3554 of 3682 Old 10-18-2019, 01:22 AM
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Quote:
Originally Posted by mrtickleuk View Post
Ooh. I hope we get to see this uploaded to their YT channel!

https://twitter.com/TylerPruitt/stat...04154042355712
There's a thread about it HERE
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post #3555 of 3682 Old 10-21-2019, 04:37 AM
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Originally Posted by chros73 View Post
... the 19. point of the HDR10 WB is different between B8 and C8.
Quote:
Originally Posted by ConnecTEDDD View Post
The points (with 10-bit code) are not actually PQ-EOTF code values points, but gamma based points, then its added the PQ-EOTF tracking of tone-mapping.
I noticed something strange.
Can we say that the 19. point of WB signals us which tone curve is used by the TV out of the 3?

If that's true, then something weird is going on, at least with madvr passthrough on PC.

I theory, the 3 tone curves and their corresponding 19. WB points:
- 0 - 1000 : 669 (C8) , 669 (B8)
- 1001 - 4000 : 696 (C8) , 692 (B8)
- 4001 - 10000 : 713 (C8) , 705 (B8)

Now, the nits settings in madvr pixelshader with "output HDR format":
- 669 (C8) , 669 (B8) : 100 - 760
- 696 (C8) , 692 (B8) : 761 - 2500
- 713 (C8) , 705 (B8) : 2501 - 10000

Also noticed (!) when using passthrough:
- the 19. WB point only changes based on the mastering luminance value and *not* the maxCLL value of the metadata

Manni checked the metadata using HDFury and he said the GPU output is correct.
That can mean 1 thing, that LG screwed this up as well ...

If the above is true than the worst case scenario is a content like "Guardians of the Galaxy (2014)": "master luminance" 0.005/4000 ; maCLL/FALL 577/512
- although maxCLL is 577 nits but the "master luminance" is 4000, so the strongest tone curve is used by LG and not the lightest

Can somebody double check this with (preferably) standalone player and a HDFury device if you have one?

Thanks!

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Last edited by chros73; 10-21-2019 at 04:41 AM.
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post #3556 of 3682 Old 10-21-2019, 08:51 AM
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2018 LG OLED Calibration and User Settings (No price talk)

Quote:
Originally Posted by chros73 View Post
I noticed something strange.

Can we say that the 19. point of WB signals us which tone curve is used by the TV out of the 3?



If that's true, then something weird is going on, at least with madvr passthrough on PC.



I theory, the 3 tone curves and their corresponding 19. WB points:

- 0 - 1000 : 669 (C8) , 669 (B8)

- 1001 - 4000 : 696 (C8) , 692 (B8)

- 4001 - 10000 : 713 (C8) , 705 (B8)



Now, the nits settings in madvr pixelshader with "output HDR format":

- 669 (C8) , 669 (B8) : 100 - 760

- 696 (C8) , 692 (B8) : 761 - 2500

- 713 (C8) , 705 (B8) : 2501 - 10000



Also noticed (!) when using passthrough:

- the 19. WB point only changes based on the mastering luminance value and *not* the maxCLL value of the metadata



Manni checked the metadata using HDFury and he said the GPU output is correct.

That can mean 1 thing, that LG screwed this up as well ...



If the above is true than the worst case scenario is a content like "Guardians of the Galaxy (2014)": "master luminance" 0.005/4000 ; maCLL/FALL 577/512

- although maxCLL is 577 nits but the "master luminance" is 4000, so the strongest tone curve is used by LG and not the lightest



Can somebody double check this with (preferably) standalone player and a HDFury device if you have one?



Thanks!
All of this assumes that dynamic tone mapping is disabled:

There’s a simple way that the meta-data is treated. It’s very obvious after you hear how it works. I had the same idea back in 2015.

If there is no mastering display or MaxCLL meta-data the TV will assume 4000 nit content.

If MaxCLL is lower than mastering display peak Lum value, The TV uses MaxCLL.

If MaxCLL is higher than mastering display peak Lum value, The TV uses the mastering display peak Lum value.
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post #3557 of 3682 Old 10-21-2019, 09:19 AM
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Quote:
Originally Posted by WiFi-Spy View Post
If MaxCLL is lower than mastering display peak Lum value, The TV uses MaxCLL.
If MaxCLL is higher than mastering display peak Lum value, The TV uses the mastering display peak Lum value.
Thanks Tyler!

But in this case: "Guardians of the Galaxy (2014)": "master luminance" 0.005/4000 ; maxCLL 577 ; maxFALL 512
Why the largest "713 (C8) , 705 (B8)" 19. point value is shown??? (577 < 4000)

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The problem with MaxCLL numbers is that its not at all accurate, as for the calculation they are using only RAW RGB data, the mastering the 16-bit TIFF files for example, before the encoding.

When that scanning has been completed; to find out MaxCLL + MaxFALL), then they input the MaxCLL/MaxFALL numbers and the mastering display data to the HDR profile of the the encoding software.

For MaxCLL interpretation, the unit is equivalent to cd/m2 when the brightest pixel in the entire video stream has the chromaticity of the white point of the encoding system used to represent the video stream. Since the value of MaxCLL is computed with a max() mathematical
operator, it is possible that the true CIE Y Luminance value is less than the MaxCLL value. This situation may occur when there are very bright blue saturated pixels in the stream, which may dominate the max(R,G,B) calculation, but since the blue channel is an approximately 10%
contributor to the true CIE Y Luminance, the true CIE Y Luminance value of the example blue pixel would be only approximately 10% of the MaxCLL value.

So the real MaxCLL number can be lower or higher (as the encoding will add some errors and deviations from uncompressed data), madVR has a utility which can scan the entire stream to find out these numbers.

Also it can happen the opening movie logo, the end credits or subpixel from the scanned filmed which forgotten to be removed, to provide a wrong calculation which will affect later the whole movie playback.

There some movies where studios put that BDA recommendation as value for MaxCLL, which is 400, without scanning the mastering picture files.
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post #3559 of 3682 Old 10-21-2019, 01:32 PM
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Quote:
Originally Posted by ConnecTEDDD View Post
The problem with MaxCLL numbers is that its not at all accurate, as for the calculation they are using only RAW RGB data, the mastering the 16-bit TIFF files for example, before the encoding.

When that scanning has been completed; to find out MaxCLL + MaxFALL), then they input the MaxCLL/MaxFALL numbers and the mastering display data to the HDR profile of the the encoding software.

For MaxCLL interpretation, the unit is equivalent to cd/m2 when the brightest pixel in the entire video stream has the chromaticity of the white point of the encoding system used to represent the video stream. Since the value of MaxCLL is computed with a max() mathematical
operator, it is possible that the true CIE Y Luminance value is less than the MaxCLL value. This situation may occur when there are very bright blue saturated pixels in the stream, which may dominate the max(R,G,B) calculation, but since the blue channel is an approximately 10%
contributor to the true CIE Y Luminance, the true CIE Y Luminance value of the example blue pixel would be only approximately 10% of the MaxCLL value.

So the real MaxCLL number can be lower or higher (as the encoding will add some errors and deviations from uncompressed data), madVR has a utility which can scan the entire stream to find out these numbers.
Very interesting.

Quote:
Also it can happen the opening movie logo, the end credits or subpixel from the scanned filmed which forgotten to be removed, to provide a wrong calculation which will affect later the whole movie playback.
Wow! I hadn't thought of that! That would make a mockery of the metadata. Imagine that, the opening logo actually has a bright pixel in it and the studio wonders why its metadata is always the same for every movie...

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post #3560 of 3682 Old 10-21-2019, 02:16 PM
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2018 LG OLED Calibration and User Settings (No price talk)

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Originally Posted by mrtickleuk View Post
Very interesting.







Wow! I hadn't thought of that! That would make a mockery of the metadata. Imagine that, the opening logo actually has a bright pixel in it and the studio wonders why its metadata is always the same for every movie...


Most of what he posted is no longer an issue, due to new metadata calculation tools like ColorFront TransKoder and new best practices for metadata calculations.

Myself and Stacey Spears were one of the first people to bring light to these issues.
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post #3561 of 3682 Old 10-21-2019, 04:04 PM
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Originally Posted by WiFi-Spy View Post
Most of what he posted is no longer an issue, due to new metadata calculation tools like ColorFront TransKoder.
It happens to have my own private list with 95% of the whole market HDR10 movie metadata (even 2-4 metadata of same movie but from different regions also (UK/DE/CEE/US etc.) while the same time most of them has been scanned with madVR tool and the maxCLL numbers are always different.

Most of the times the difference is between 30-200 nits, but it can happen the difference to be 2000/5000/6000 nits in MaxCLL, between metadata stream vs. measured with madVR tool numbers.

There already in the market movies with wrong calculation of MaxCLL and there no control of what software each studio has been used (and which version etc.)

But I will check S&M3 maxCLL (where ColorFront TransKoder has been used), as I have already transcode the video to 16-bit TIFF's, since I have re-done the DolbyVision iCMU 4.0 with Resolve or other tests like remapping from master files to 100, 600, 1000 or 2000 nits, or some other analysis/re-encoding using MTI Film Cortex. (Stacey's stuff is awesome)

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post #3562 of 3682 Old 10-22-2019, 04:50 AM
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Quote:
Originally Posted by ConnecTEDDD View Post
It happens to have my own private list with 95% of the whole market HDR10 movie metadata (even 2-4 metadata of same movie but from different regions also (UK/DE/CEE/US etc.) while the same time most of them has been scanned with madVR tool and the maxCLL numbers are always different.
Just a note about madvr's measuring process: if I remember correctly, it ignores the 1% or 0.1% of the brightest pixels exactly for this reason.

But can we get back to the original problem instead?
We don't care whether the metadata is correct or not in a stream, but we *do* care about LG is doing something strange with the supplied metadata

So, one more time (maybe I wasn't clear enough), *if* the 19. WB point truly represents which tone curve is used:
1. LG 2018 models have 3 tone curves
2. 2018 models should favour maxCLL (if it's present and smaller then MDL) instead of MDL
3. madVR output metadata is correct even if "output HDR format" is used (Manni was kind enough to test it)
- the entered "real peak nits" value (he used 760) becomes MDL and MaxCLL (maxFALL = MDL / 3)
4. point 3. means that the 3 tone curves are triggered by the following MDL values:

Quote:
Originally Posted by chros73 View Post
Now, the "real peak nits" settings in madvr pixelshader with "output HDR format" for the 3 tone curves (1000, 4000, 10000):
- 1000 : 669 (C8) , 669 (B8) : 100 - 760
- 4000 : 696 (C8) , 692 (B8) : 761 - 2500
- 10000: 713 (C8) , 705 (B8) : 2501 - 10000
5. *and* this example shows that maxCLL is ignored completely! :

Quote:
Originally Posted by chros73 View Post
But in this case using passthrough: "Guardians of the Galaxy (2014)": "master luminance" 0.005/4000 ; maxCLL 577 ; maxFALL 512
Why the largest "713 (C8) , 705 (B8)" 19. point value is shown??? (577 < 4000)
So, in summary:
- *if* the different 19. WB point values represent the 3 tone curves
- then LG screwed up their firmware of 2018 models (once again!) (B8 and C8 as well), so they ignore the maxCLL metadata values *or* it never worked as it should!
- the result in the worst case (e.g. with Guardians of the Galaxy (2014)) is that the strongest tone curve (10000) is used and not the lightest (1000): resulting in darker image than necessary

So the question is:
can somebody verify that the different 19. WB point values represent the 3 tone curves?

Thanks
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post #3563 of 3682 Old 10-22-2019, 09:48 AM
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Quote:
Originally Posted by chros73 View Post
Just a note about madvr's measuring process: if I remember correctly, it ignores the 1% or 0.1% of the brightest pixels exactly for this reason.

But can we get back to the original problem instead?
We don't care whether the metadata is correct or not in a stream, but we *do* care about LG is doing something strange with the supplied metadata

So, one more time (maybe I wasn't clear enough), *if* the 19. WB point truly represents which tone curve is used:
1. LG 2018 models have 3 tone curves
2. 2018 models should favour maxCLL (if it's present and smaller then MDL) instead of MDL
as Vincent points out in this video
3. madVR output metadata is correct even if "output HDR format" is used (Manni was kind enough to test it)
- the entered "real peak nits" value (he used 760) becomes MDL and MaxCLL (maxFALL = MDL / 3)
4. point 3. means that the 3 tone curves are triggered by the following MDL values:



5. *and* this example shows that maxCLL is ignored completely! :



So, in summary:
- *if* the different 19. WB point values represent the 3 tone curves
- then LG screwed up their firmware of 2018 models (once again!) (B8 and C8 as well), so they ignore the maxCLL metadata values *or* it never worked as it should!
- the result in the worst case (e.g. with Guardians of the Galaxy (2014)) is that the strongest tone curve (10000) is used and not the lightest (1000): resulting in darker image than necessary

So the question is:
can somebody verify that the different 19. WB point values represent the 3 tone curves?

Thanks
It is very easy to see the different tone curves.

Turn of Dynamic tone mapping.

Set pattern generator to MDL 1000 MaxCLL 1000. Measure 21+ points of grayscale

Then change both to 4000, then measure the Grayscale again. You will see the 4000 nit tone curve. Same for 10000 nits.

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post #3564 of 3682 Old 10-23-2019, 02:07 AM
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Quote:
Originally Posted by WiFi-Spy View Post
Set pattern generator to MDL 1000 MaxCLL 1000. Measure 21+ points of grayscale
Then change both to 4000, then measure the Grayscale again. You will see the 4000 nit tone curve. Same for 10000 nits.
Thanks, probably it will work, but I don't have any other PG than madvr's madPG (along with HCFR), so I'm not sure how accurate the result would be.
Anybody else to give a hand?

And the above exact test still won't answer what happens to maxCLL and the weird MDL values that triggers the different 19. WB point values.

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post #3565 of 3682 Old 10-23-2019, 04:23 AM
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Quote:
Originally Posted by WiFi-Spy View Post
It is very easy to see the different tone curves.

Turn of Dynamic tone mapping.

Set pattern generator to MDL 1000 MaxCLL 1000. Measure 21+ points of grayscale

Then change both to 4000, then measure the Grayscale again. You will see the 4000 nit tone curve. Same for 10000 nits.
The test should performed differently.

Measure 21-Point Grayscale with HDR patterns with metadata:

1) Check 1000 nits mastering display tone-mapping:

Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0050 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 1000 cd/m2
Maximum Frame-Average Light Level : 512 cd/m2

2) Check 4000 nits mastering display tone-mapping:

Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0050 cd/m2, max: 4000 cd/m2
Maximum Content Light Level : 4000 cd/m2
Maximum Frame-Average Light Level : 512 cd/m2

3) Guardians Of The Galaxy metadata, to see if LG will use the maxCLL which is lower from mastering display value.

Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0050 cd/m2, max: 4000 cd/m2
Maximum Content Light Level : 577 cd/m2
Maximum Frame-Average Light Level : 512 cd/m2

Then compare/post the results.

Quote:
Originally Posted by chros73 View Post
Thanks, probably it will work, but I don't have any other PG than madvr's madPG (along with HCFR), so I'm not sure how accurate the result would be.
Anybody else to give a hand?

And the above exact test still won't answer what happens to maxCLL and the weird MDL values that triggers the different 19. WB point values.
Do you have the capability to define madVR's HDR metadata from your HCFR or CalMAN?

I have checked LightSpace and it has that capability for patch generation:

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post #3566 of 3682 Old 10-23-2019, 05:33 PM
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Yes, I meant unplugging, but you are right, it is obvious you have done that. If you t have also all your HDMI unplugged, I am afraid, you have to call assistance ....
As somewhat expected, this required a mainboard replacement to fix. I will be somewhat amused if and when LG releases a firmware update for the C8 and/or C9 with a cryptic comment about improved error handling for DV calibration data or similar
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post #3567 of 3682 Old 10-23-2019, 05:59 PM
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As somewhat expected, this required a mainboard replacement to fix. I will be somewhat amused if and when LG releases a firmware update for the C8 and/or C9 with a cryptic comment about improved error handling for DV calibration data or similar
You will have to inform the developer of these LG features about your problem (Neil Robinson), as he is the only responsible for that stuff, describe the problem you had to see if he can add something to a future FW release or add it to future models. I will PM you his email address.
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post #3568 of 3682 Old 10-24-2019, 01:27 AM
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Quote:
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Help! I tried to upload a dolby vision configuration file to my C8 using Calman LG Home, and immediately after doing that, the tv shut itself off and entered some kind of boot loop. Now as soon as it's plugged in it tries to turn on, then a few seconds later I hear the relay click and it repeats.

I can't access the menu to do a factory reset.

I assume there was something wrong with the dolby vision configuration file I uploaded somehow and the TV doesn't like it. Any suggestions how to bypass this/upload a new file/trigger a factory reset/etc?
Quote:
Originally Posted by theMule View Post
As somewhat expected, this required a mainboard replacement to fix. I will be somewhat amused if and when LG releases a firmware update for the C8 and/or C9 with a cryptic comment about improved error handling for DV calibration data or similar
Wow. That's really serious. Glad you now have your TV back - but wow, wow what a crisis.

It's made me incredibly nervous about doing another Dolby Vision calibration. Did we even work out what was "wrong" with the file you uploaded, to upset the TV that much?

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post #3569 of 3682 Old 10-24-2019, 07:23 AM
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Wow. That's really serious. Glad you now have your TV back - but wow, wow what a crisis.

It's made me incredibly nervous about doing another Dolby Vision calibration. Did we even work out what was "wrong" with the file you uploaded, to upset the TV that much?
I think the broader point is that firmware may have bugs, firmware updates may go wrong, etc, and it would be good practice IN GENERAL to have a user accessible recovery mechanism.

One way this is typically implemented e.g. on PC motherboards/wireless routers/etc is to have a recovery flash update procedure managed by a read-only part of the firmware, reading e.g. the flash file off a usb key (or sometimes for wireless routers a tftp client/server to load the firmware file over wired ethernet at a fixed ip address)

Having to replace the mainboard because of a bad firmware update or whatever is a waste of time/money/effort, and also offensive from an environmental perspective :P
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post #3570 of 3682 Old 10-24-2019, 09:50 AM
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Originally Posted by theMule View Post
I think the broader point is that firmware may have bugs, firmware updates may go wrong, etc, and it would be good practice IN GENERAL to have a user accessible recovery mechanism.

One way this is typically implemented e.g. on PC motherboards/wireless routers/etc is to have a recovery flash update procedure managed by a read-only part of the firmware, reading e.g. the flash file off a usb key (or sometimes for wireless routers a tftp client/server to load the firmware file over wired ethernet at a fixed ip address)

Having to replace the mainboard because of a bad firmware update or whatever is a waste of time/money/effort, and also offensive from an environmental perspective :P
It's also entirely possible that you might have suffered a failed component on the board and would have seen the same issue on the next restart of the TV regardless. For example, a power supply capacitor failing can cause the kind of power cycling you described. Honestly, although the two incidents (your user error in uploading an improper file and the set's cycling on and off) followed each other, no cause-and-effect has been proven.
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