https://nl.aliexpress.com/item…042311.0.0.40d84c4dDxIbFD
So i got my HDMI splitter with simutanously 4k and 1080p output i got only one struggle and that would be that my libreelec device doesn't remember hit sound output devices on startup/reboot/power down.
Some one else got this issue and how did they solve it?