I have the latest Coreelec stable release running on KM9 Pro (s905x2, 4 gb, 32gb) from microSD. The box is directly connected to a Samsung NU6100 43 inch 4K HDR TV via Amazon basics HDMI 2.0 cable with ethernet rated for 18GB/s. The only issue I am facing with this setup is that when watching 4k HDR videos with HD audio tracks (TrueHD/DTS HD) the image on TV screen appears flashing as if backlight is flickering every other second. Its not a high frequency flicker. As soon as I change audio track to non HD audio this stops and I get normal and perfect HDR picture. This issue is consistently reproducible across various H.265 files which are 4K HDR and has at least one HD audio track. The moment I chose an HD audio track flickering starts. Anyone got any ideas why this may happen?
Important note - tested with non HDR 4k file with DTS Master HD audio and no issues. So it’s HDR + HD audio causing the issue
You can try in to change in System–>Video the force colour depth display to 10 bit.
Hi, if you meant the CoreElec options under System menu, I have tried to enable and disable all the below options one by one, reboot between the changes and then test.
- Noise reduction
- Forcing 8 bit video
- Enable 4:2:2 colour sampling
But still no dice, same issue.
You did not upload any log and your settings are available only in EOL CE systems.
Update to CE-20 and check the options in display expert settings!
Oh! I thought enabling auto update in settings was supposed to get me to latest stable build automatically. Mine is something like 19.8. How do I update the CE20, do i need to re-image the microSD?
19.8 does not exist, use this guide:
I have Samsung TV similar to yours
Any success with clean install?.
Just a thought
You are connected directly to TV
For Audio you are limited to 2 channels
Internal speakers Samsung
HD Audio multichannel…
Still TV speakers are stereo
In Samsung TV settings go to
HDMI Input Audio Format
Change from Bitstream to PCM
Maybe will help
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