4k use codec h265
full hd use h264 codec
If you have full hd tv and 4k iptv player you will see full hd resolution 1920x1080
if you have 4k tv and 4k iptv player you will see 4k resolution - 3840 × 2160
What do you mean by player? Software or hardware? I have 4k hardware and the resolution is 1080. Still, the original feeds are not 4k as bein has only one 4k channel. Im not complaining about the quality, but rather about it being mislabeled.