Thanks for your response.
I bought HDMI splitter as suggested by PANiCnz and now my setup is as follow:
͏͏͏͏͏͏͏͏͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ̷ ͏͏→ TV (HDMI 1) N2 -> HDMI switch → | ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏ ͏͏\ → AVR (HDMI Media player)
TV (HDMI 2 - ARC) → AVR (HDMI ARC)
Everything with sound works correctly as my old AVR (2013 premiere) can decode all DTS types, Dolby True HD etc.
Truly speaking I’m a little bit upset as in the AVR’s manual it stays clearly:
“This unit supports input and output of 4K Ultra HD (3840 x 2160 pixels)
video signals of HDMI.”
and:
“Supported video signals: 4K 30/25/24 Hz”
but I was not able to get Kodi GUI with those resolutions at all.
Anyway now with sound everything is OK but now I have a CEC issue: HDMI-CEC Problems Odroid C4 / N2 / N2+ - #68 by Vodalex
I will test with latest Nightly…