I have a lot of 1080p movies on my plex server running dual CPU’s and 128GB if ram over 10G network. I could never figure out why the system would never serve 4k media over the network to my 4k tvs. The biggest area of confusion for me was TRANSCODING. I thought it was a standard process of sending a movie over the network. This is where I went wrong. For those that have not read the following thread from Tecknojunkie, it’s a MUST READ. Plex, 4k, transcoding, and you - aka the rules of 4k - a FAQ
When I read the above thread, I thought Teknojunkie was asking us not to even use 4k media on plex. What he was stating is not to TRANSCODE the media and instead serve the media in its native 4k format. Transcoding degrades the media from a high resolution movie to a lower version so your tv can play it. There are many reasons why transcoding happens. Your TV is not 4k, your cables are low quality, your network can’t support, etc.
My setup was further complicated due to a control4 video matrix switch tied to my home automation system. All my sources sit in two network racks and are served to all the tv’s over cat6a cable. I will not discuss the video matrix part as it does not apply to most people in this thread.
After doing research on all my playback devices, I came to know most don’t even have gigabyte ethernet designated as 10/100/1000 or 1000baset connections. Most only did 100 mb. Even my ROKU 4k Ultra player did not have a gigabyte ethernet connection. None of my tv’s did either. I could not use any of the TV’s or devices I had to play 4k. What I mean by this is you cannot install plex on a ROKU 4k Ultra or 4k TV and stream 4k media. The flaw is the network port on these devices.
I purchased an Apple TV 4k to test out this issue. Once a few settings on the apple TV were adjusted such as “match quality” the TV started to show 4k content from the plex server. The plexserver dashboard also showed the video was not being transcoded and was being “direct played” . I still had buffering issues but not quite as bad and the recovery was much faster.
I purchased an NVIDIA SHEILD PRO unit as teknojunky was using. This did the trick. The NVIDIA shield was able to effortlessly play back 4k content over my network through my video matrix switch without ANY buffering issues at all. Playback was at approx 80 megs/sec but can spike depending on content being served to over 120 megs/sec. (this is why a gig hardwired connection is a MUST) Wifi won’t cut it.
All of my 4k devices are now playing 4k content directly. This is not a huge difference on a 65" television but does wonders on a JVC 4k Projector. skip forward and reverse are quick also. The video appears right away and doesn’t take a while.
In rooms I do not have a dolby atmos receiver, the audio gets transcoded but this is not a huge problem for a decent server to handle.
I have tested this setup with atleast 12 movies so far. The only time I had an issue was on one movie when I had subtitles set to english. I believe adding subtitles eats away at the processing power of the server since it has to burn it into a live video stream. I removed the subtitles and the problem went away.
Final Setup:
Unraid Server running on a dual CPU supermicro board with 40TB of drive storage
Ubiquiti Networking gear all GIG with 10G wiring and infrastructure in whole home.
Nvidia Shield PRO playback device for all 4k content
High Quality 4k 18g HDMI cables
Cat6A wiring throughout properly terminated. NO QUICK JACKS
Various 4k Televisions from LG
JVC 4k Projector
Dolby ATMOS capable receivers in living and game room.
Control 4 Automation with 4k Video Matrix switch