As mentioned earlier You Tube 4K and Netflix 4K have horribly low bit rates for 4K + bit shaping etc and not to mention plenty of mpeg compression and re encoding and can not really convey a decent 4K or the best 1080p experience because of that neither can 2160p/30 in all cases
Think of Netflix and You Tube 4K as mp3 4K and 1080p if you will although in You Tube case it's H .264 mp4 or mostly VP9 now and I believe a propriety HEVC variable bit rate encode for Netflix all lossey compression like mp3. only video often with compressed audio also . You tube UHD (VP9 or H.265 probably isn't any better on a TV iptv browser than it would ve on a PC that outputs 2160p/60 or probably even 2160p/30 or arguably not significantly
better than a PC @ 1080/p 60 with a good scaler like you would see in decent iGPU or discrete GPU .
As mentioned earlier here ,Lots of good Sony,Samsung ,Panasonic and LG 2K/4K eye candy Demo loop
downloads to be had here one can even play them at 1080p or 2160p/XX from a PC and as noted earlier here maybe or maybe not realize a slightly better than Blue Ray experience if your TV and panel supports YCbCr 4:4:4 or 0-255 color palate ( color profile) Blue Ray uses YCbCr 4:2:2 16-235 color profile a lot of that depends on quite a few things I don't even understand .
Either way in any event these download Demos are very decent and much better than anything you could ever hope to see on You Tube , Netflix or any ip video stream . Think a fast metal hdd transfer rate potential
of ~ 80 MB/s more and a Netflix 4K iptv HEVEC bit rate throughput of maybe 15 Mbps under good conditions and a similar bit rate for You tube 4K VP9 not even close .
From a PC You have to set YCbCr 4:4:4 output at GPU/iGPU GUI ,Supporting TV decodes it automatically when present .
some sets and game consoles support that , in some cases on some displays it can degrade the image in which case a YCbCr 4:2:2 or RGB 16-235 setting would be better .
One should be able to play the UHD demo files in 1080p/ 2160p/30 / (2160P/60 if your PC GPU has the stones) just fine also no real fast motion just plenty slow moving way cool eye candy
UHD Demo Files should also play on properly formatted USB
(FAT 32 or exFAT 32 formatted ) flash drives on some sets also most are 1GB or under so FAT 32 should be fine
For PC playback VLC would be the video player of choice WMC won't play a lot of them.
One advantage to these downloaded demos are much higher bit rate transfers from hdd
than one would ever see from an iptv ,ip Netflix ,You tube or any iptv, ip video stream
and probably much lower compression settings .
There may be some with proprietary encodes/containers that may not play in VLC , not to many though most of them are duplicated in MP4 or something anyway so I wouldn't be concerned about that if they don't play in VLC I would just just move on .
Link as posted earlier here by somebody (s) and afterwards probably me also
Link : http://demo-uhd3d.com/categorie.php?cat=demouhd
Use the embedded Google translator when you get there.