i have downloaded from YT a couple of4k videos (New York City 8k HDR - YouTube) with 4k downloader. I have uploaded them on my NAS and I noticed that with infuse (TVoS) the video is not played. the screen stays with the white spinning wheel on black background, but, when I go back, it is like the video was playing.
I tried to read them with VLC (tvOS) and it reads them.
i have attached the VLC codec infos and the 4k downloader screen to let you se what I have choose.