How fast my processor has to be in order to play 4k UHD 2160p movies on my TV?

Okey here is another test with some sample files (provided here as links):

Plex App in Samsung TV: both files did work, they say “buffering” probably because the TV is connected to the WiFi and is not fast enough

tv-1

tv-2

Plex App in Apple TV: First video fails, second one play intermittently
appletv-1

appletv-2

Plex App in Roku Premiere+:

  • 1st video fails: Conversion failed, the transcoder exited due to an error.
  • 2nd video stop every second with a loading indicator
    roku-2