Change chroma sampling to YCbCr 4:4:4

Help and Support
1

Hello I bought the vero 4k+. Im happy with it but i have a problem, my tv is a lg from 2016 fullhd. My tv cant output corretly YCbCr 4:2:2 because cause a lot of color banding. In my blu ray player output YCbCr 4:4:4 and the image looks good. How can i put the vero 4k+ to output YCbCr 4:4:4 like my blu ray player.

2

It will output 444 by default. Make sure Force 422 colour subsampling is OFF in Settings->System->Display.

3

Its off and it still output YCbCr 4:2:2

4

To get a better understanding of the problem you are experiencing we need more information from you. The best way to get this information is for you to upload logs that demonstrate your problem. You can learn more about how to submit a useful support request here.

Depending on the used skin you have to set the settings-level to standard or higher, in summary:

  • enable debug logging at settings->system->logging

  • reboot the OSMC device twice(!)

  • reproduce the issue

  • upload the log set (all configs and logs!) either using the Log Uploader method within the My OSMC menu in the GUI or the ssh method invoking command grab-logs -A

  • publish the provided URL from the log set upload, here

Thanks for your understanding. We hope that we can help you get up and running again shortly.

OSMC skin screenshot:

image
image957×540 224 KB

Also - what makes you think it is outputting 422? Does the TV give you this information?

5

https://paste.osmc.tv/erakagurin

6

Your TV does not seem to support deep colour (10-bit video) which is surprising for a 2016 model. Do you see the same issue if you plug Vero into the TV direct?

It is also surprising that 422 shows banding while 444 (8-bit) does not. You can force Vero to output 8 bits using the commandline via ssh and typing:

echo 4448bitnow | sudo tee /sys/class/amhdmitx/amhdmitx0/attr

If that works, we can tell you how to make that setting permanent (ie survive a re-boot).

1 Like
7

How i put the commnadlines??

8

Please see the folowing wiki…

9

It works how i can do it permanently??

10

type
sudo nano /etc/rc.local

that starts an editor on the file rc.local

type this just above the line where it says exit 0

echo 4448bit > /sys/class/amhdmitx/amhdmitx0/attr

save the file (ctrl-X). Re-boot and check that it still works.

1 Like
11

it works thanks so much. It will be ok if you can switch without using the console.

Again thanks

12

We could do that, but your situation is very rare.