I have access to UHD streams on ASTRA/HotBird Satellites via a TVHeadend server.
Using the the Hts client I can play all streams except UHD (they do seem to be HLG, but not sure) on my Intel Kodi machine.
I can play the channels on Rpi 4 clients.
I can play a recording of these streams in both Intel and rpi clients, so its not the player that has an issue with the content. Playing back the recording uses HW decoding.
Any idea what's wrong with the Intel hts-client? Sometimes it works if I turn off Hevc VAAPI and/or, when I tell the client to use http streaming.