I have to type in this exactly in the shell and this made the necessary script?:
#!/bin/bash
sleep 5
echo round1 >/sys/class/amhdmitx/amhdmitx0/debug
Sorry for the question, i´m not a shell or linux speci…
I guess it is best to wait for @Martorias to give you some help. But from what I understand is you copy that 3 lines into a script and you call that script via kodi callbacks
Ok… i think for most vero users with the banding problem is it very usefull when someone tell us what we have to do to write such a kodi callback script…
Hi. Yes I put those lines in a file “round.sh”
Make it executable “sudo chmod +x round.sh”
Create a task in kodi callbacks to execute said script (browse it)
Create event on playback start to run that task.
I can make a better guide when I get home if you’d like as I think you can just execute the oneliner straight from callbacks without the need of a file
2 Likes
This will be great, thank you! 
Just received my vero 4k, using it with my Lg C7 oled. I’m also having problems with HDR color banding with HDR material. I did set the 444, 10bit mode as below, but did not help with this problem. The problem seems to with all HDR material with similar specs as described below.
Media info:
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@High
Codec ID : V_MPEGH/ISO/HEVC
Duration : 2 h 19 min
Bit rate : 66.6 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.335
Stream size : 64.8 GiB (87%)
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : SMPTE ST 2084
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : R: x=0.680000 y=0.320000, G: x=0.265000 y=0.690000, B: x=0.150000 y=0.060000, White point: x=0.312700 y=0.329000
Mastering display luminance : min: 0.0000 cd/m2, max: 1000.0000 cd/m2
Maximum Content Light Level : 1000 cd/m2
Maximum Frame-Average Light Level : 321 cd/m2
I did run these using SSH:
osmc@vero4k:~$ echo “444,10bit” | sudo tee /sys/class/amhdmitx/amhdmitx0/attr
444,10bit
osmc@vero4k:~$ cat /sys/class/amhdmitx/amhdmitx0/hdr_cap
Supported EOTF:
Traditional SDR: 1
Traditional HDR: 0
SMPTE ST 2084: 1
Future EOTF: 1
Supported SMD type1: 1
Luminance Data
Max: 0
Avg: 0
Min: 0
Why does the EOTF traditional HDR have value 0? Is this what causes the problems?
Still the TV does recognize the signal to be HDR and having BT.2020 color space.
I’m using 2.0a certified hdmi cable and having ultra deep color mode enabled on tv. With this HW I have previously played these same clips on Xiaomi mibox Kodi successfully without any color banding.
Are you in 10-bit mode? -->Should be as noted above.
Is the film HDR? -->Yes.
Did you run this as root?–> I did run this after SSH login: “sudo passwd root”, told me to change pw and after that that pw changed. So I guess so?
Is your device up to date? Everything installed, says no new updates ATM.
Any suggestions what to try next?
Banding will be fixed shortly. There is currently a workaround but we would prefer to resolve this properly
1 Like
Just a heads up Martorias, I was getting inconsistent results using the one line command in callbacks. Ended up using the script above with sleep 1 instead of sleep 5. Placed script in /home/osmc as I wanted it local as opposed to somewhere on the network. Working solidly now.
Right good to know - were you using the sleep inside the one linser or just the echo?
Just the echo line. I found it didn’t work consistently so I did as you suggested and made the script. There may be a need for the sleep variable so it would appear the script method is the best workaround.
Ok thanks, Ill do some tests after dinner and see if I can make a beginner friendly guide until Sam figures it out 
It may be figured out already.
With the kernel I sent you last night for testing, it did not work because I had forgot to push my changes 
nice. Let me know when I can try again
Ok so basic guide for temporary automated banding solution:
-
Create a script by writing
nano banding.shenter -
Paste these three lines in the editor (usually by simply right clicking) and then press CTRL+X, Y, Enter to save.
#!/bin/bash
sleep 2
echo round1 >/sys/class/amhdmitx/amhdmitx0/debug
-
Install the Kodi Callbacks addon- in Kodi go Addons, Install from repository, Kodi Addons, services, kodi callbacks and install!
-
After installing select Configure and add a ‘script’ task. Browse for script and select your new banding.sh (should be in home folder)
-
Go to Events tab and create an event on Playback Started and make sure the task is “task 1”
-
If you want to (you probably do) go to the General tab and make sure “Display notifications when task run?” is disabled
Press OK and you’re done!
If there’s still something unclear let me know
5 Likes
Nice write up! Maybe a reference to where to place the script. I made mine in /home/osmc. So the command would be “sudo nano /home/osmc/banding.sh” to create the script file.
Thanks a lot! This did the trick, banding is now completely gone.
Doh! Never mind, I see the reference in the screenshots lol
Yeah I tried to keep it simple, that’s the default path when connected and then easy to find using browse
Edit: added path description in instructions. Also, no need for sudo in your home folder
Makes sense. Great job
I had no banding issues until Jumanji: Welcome to the Jungle which had pretty bad banding on some scenes with bright, sunlit sky.
Setup the Round1 command with Kodi Callbacks and it solves the problem
completely 
Question is…
What is Round1, Round0 doing? I tested it last night with a bunch of UHD HDR test patterns and could see no differences either way.