with hikvision its h265+ its there newer compression you need to read up on it.
it was built for the newer 4k cameras.
it works well and there not kidding with the storage i am very amazed in what it can do
running a hikvision 7series 4k nvr with four 4k cameras on full resolution and frame rates it struggled and would freeze up
flick them all over to h265+ there is no maxing out the nvrs incoming bandwidth and and able to add more cameras plus watching from a mobile device when tunneled in
works nicely