Since the player app updated most recently it acts like it’s trying to play via WAN even though it’s in the wired LAN and remote access is disabled. During playback if I try to change to original quality, it says there isn’t enough bandwidth and returns to Transcoding at 720p. From what I can tell it’s doing this to all local media. I have an AppleTV (1080p), FireTVs, as well as the VIZIO TV that is connected to the ATV and all of them play local media at original quality with zero buffering. That tells me that my network is plenty fast. I turned the on-screen diagnostics on for the ATV and the URL for the media had some IP I’m not familiar with at the beginning of it. It isn’t on my LAN and isn’t my WAN IP either. I’m not really sure where to go from here besides just not using my ATV device any longer, which isn’t optimal.
It was an indirect connection. I completely disabled remote access and closed the port which caused the ATV4K to not be able to find the server any longer. Strangely my phone and other devices can still see it on the network. I then tried unplugging the cable from the LAN and connecting to my WiFi. Bam, now it all works like it’s supposed and streams full 4K HDR at original quality. I’m completely at a loss as to why it can’t see it over the wired connection. Unfortunately ATV doesn’t give you much network info, but the IP was part of my local network, and I don’t have any VLANs besides a guest WiFi. I’m a big proponent of wired connections where available so I don’t like WiFi as a solution, but that’s where I’m at right now.
server logs that cover the start of playback should have info on how it is connecting and what connection attempts failed which made it try an indirect