YouTube has supported 4K Ultra HD video since 2013.
YouTube Ultra HD videos use a codec called VP9.
The VP9 codec is royalty-free, meaning its adoption rate could potentially be higher, and in 2015 saw 8k videos being supported.
Google also implemented the VP9 codec into its Chrome browser and YouTube back in 2013, enabling both being able to support 4K streams for some time. If you search 4K content within YouTube right now, you'll be able to select 4K as a quality option on each video on a computer, bt on a Televison this is missing and instead is in some kind of auto mode.
The problem could be with HEVC/H.265, VP9 that needs compatible hardware - i.e. a 4K screen - to watch. Most PCs nowadays should support the VP9 codec, but with televisions it seems this proves if the TV is True 4k or some hybrid.
Whathifi say "If you don't have a compatible display, the video will be downsampled to the maximum output of your monitor."
There are a few services that offer 4k:
Netflix was one of the first video-on-demand services to announce it would be supporting 4K streaming, which went live in the UK.
Amazon also offers 4K content through its Prime Video streaming service.
You can watch 4K video via the Amazon Prime Video app on compatible TVs and the latest 4K boxes. You can see a full list of Amazon Prime Video devices here - note this is a list of compatible devices with the movie streaming app and not necessarily 4K content.
UltraFlix is a another 4K streaming network from NanoTech, which has apps available on Samsung, Sony, Vizio, Sharp and Hisense TVs.
Sony has launched its own 4K Video On Demand service in the form of Video Unlimited 4K, but is only available in the US.
BT became the first broadcaster to launch an Ultra HD channel to the UK, with BT Sport Ultra HD in August 2015.
Sky is the "UK's most comprehensive Ultra High Definition service" through its Sky Q platform launched it's ULRA HD service in August 2016.
For many, getting a fast broadband connection to support 4K streaming (realistically at the very least 30 Mbps) isn't fully possible right now.
Therefore a better way to get 4K content into the home would be on a Blu-ray disc format.
Ultra HD Blu-ray that can handle resolutions up to 3840 x 2160 are available but slow to take off.
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