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Laraine
Beginner
307 Views

color distortion when playing files with BT.2020 with EVR

If a video file contains Matrix BT.2020 (mostly HDR), color distortion will occur when playing it with Enhanced Video Renderer (aka EVR), see the screenshot below:

sample1 (normal is: this)
sample2 (normal is: this)
sample3 (normal is: this)
sample4 (normal is: this)


Here is test sample videos download for you.


This problem occurs on all 7th kabylake and above GPUs. While AMD and Nvidia GPUs don't have this problem,  the 'normal' screenshots above are made on AMD/Nvidia GPUs.
I tested it with more than 10 different GPUs (amd/intel/nvidia) for two days to confirm.

 

I asked some media player developers, and they replied that Intel's driver automatically converts BT.2020 to BT.709 with EVR (EVR uses dxva2 video processor), while it has a "bad" conversion which leads to color distortion like those screenshots.

 

How to reproduce:
1.) Use a modern video decoder (supports detecting BT.2020), LAV Video Decoder etc.
2.) Connect the decoder to EVR and play it.
I made a simple record to help you reproduce the problem, see the attachment.

Of course, i uploaded another three attachments if you need.

Labels (2)
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10 Replies
DeividA_Intel
Moderator
241 Views

Hello Laraine, 




Thank you for the information provided 


  

I will proceed to check the issue internally and post back soon with more details. 


  


Best regards, 


Deivid A.  

Intel Customer Support Technician 


DeividA_Intel
Moderator
218 Views

Hello Laraine, 



I do appreciate all the files and pictures provided, are really helpful. However, to continue with the research I will appreciate it if you can provide me with the software/app that I should use to replicate the issue and if possible a link where I can get the app (free or demo).


Thanks for the comprehension.



Regards,  


Deivid A. 

Intel Customer Support Technician 


Laraine
Beginner
213 Views

Hi,

I‘ve already provided all in the thread.

 

 

How to reproduce:
1.) Use a modern video decoder (supports detecting BT.2020), LAV Video Decoder etc.
2.) Connect the decoder to EVR and play it.
I made a simple record to help you reproduce the problem, see the attachment.

 

 

Please check the .docx document in attachment where you need everything

 

DeividA_Intel
Moderator
168 Views

Hello Laraine, 


  


Thank you for the information provided, with this I will be able to continue with the research and as soon as possible I will post back with more details




Best regards, 


Deivid A.  

Intel Customer Support Technician 


DeividA_Intel
Moderator
149 Views

Hello Laraine, 



I would like to let you know that unfortunately some of the links did not work (https://www.sendspace.com/file/y2glr1) and the replication requires MS Graph Edit and Windows SDK, and coding which lead us to suspect that this could be a coding/software issue.


I recommend you to report this with the app developer first so they can debug the issue. If they confirm it is with Intel then either the software developer contacts us directly with the debug details or you may get it from the software developer and share it with us for further investigation.


Thanks for the comprehension.




  


Regards,  


Deivid A.  

Intel Customer Support Technician  


Laraine
Beginner
140 Views

First, this is not a coding/software issue. The reason why I use MS Graph Edit is just for a more intuitive demonstration. "A video decoder + EVR" is very intuitive and clear in MS Graph Edit.

 

Second, I have already contacted the authors of GraphStudioNext and the authors of various media players, they all replied that "Intel's driver automatically converts BT.2020 to BT.709 with EVR (EVR uses dxva2 video processor), while it has a "bad" conversion which leads to color distortion".

This is not an app/software problem, but an intel problem. And because I have already said, I tested it for two days on the AMD/NVIDIA platform, the same operation, there is no problem at all.

 

Third, I will use a media player to reproduce the problem for you.

1.) use mpc-hc, download site: https://github.com/clsid2/mpc-hc/releases

2.) open the player and select EVR as video renderer in settings
3.) play those test sample video files.

Just in case you don’t know how to reproduce it, I made a record again.
https://mega.nz/file/Bhl32QiA#B6N_WpF2w7cns3Bo2leXNBwRO_Bhljv6IXhedNqwogs

 

If you still can't reproduce it at last, then I am really disappointed in Intel. Every problem I have reported back cannot be solved by Intel. This leaves me no longer motivated to find problems with intel. I have found countless bugs for AMD/NVIDIA and they have all solved them.

DeividA_Intel
Moderator
127 Views

Hello Laraine,



I do appreciate the information provided, we will give it another look and check if there is something we can do. As soon as I have any update on this I will let you know.



 

Regards,    


Deivid A. 

Intel Customer Support Technician 


DeividA_Intel
Moderator
63 Views

Hello Laraine, 

 

 

I would like you to know that we tried to replicate the issue, however, we did not face the same color distortion as you. We use an environment with the same graphics and tried with 10th gen graphics as well, but we did notice an audio delay in the videos.

 

 

You will find a video from our test attached, and we will appreciate if you let us know if we missed something and if you can share with us more detail about this color distortion issue that you have.

 

 

 

 

Regards,  

 

Deivid A.  

Intel Customer Support Technician  

 

Laraine
Beginner
53 Views

I watched your record, you are  facing the same color distortion as me.

 

Please check on NVIDIA or AMD GPUs, that's different.

 

IMHO, I find it's difficult for you to understand my feedback. I have already posted a lot of screenshots in the main thread, no more need any detail.

Maybe other customer Support Technician can know what i mean, please.

 

=====================================

color distortion:

1.png

 

noraml:

1-correct.png

 

 

color distortion:2.png

 

normal:

2-correct.png

 

 

 

color distortion:

3.png

 

normal:

3-correct.png

 

 

 

color distortion:4.png

 

normal:

4-correct.png

 

Is it clear? on nvidia & amd gpus, always normal screenshot.

(Notice: don't use Enhanced Video Renderer (custom presenter) in MPC-HC, just use Enhanced Video Renderer, Enhanced Video Renderer is microsoft's native video renderer)

 

DeividA_Intel
Moderator
35 Views

Hello Laraine, 



I am sorry if you feel like we are not helping you with this issue, we are trying our best. We did notice a difference related to the color's palette, but this could be affected depending on the monitor/TV you are using. We check with a DELL laptop and an external monitor and we can see a difference only on the external monitor but not the laptop (this is just for you to bear in mind).



However, allow us to check even further on this to provide you with a better response, I will post back with more details as soon as possible. Thanks for your comprehension.




Regards,  


Deivid A. 

Intel Customer Support Technician 


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