Is there a way to set up a media server on the Pi for streaming Video Files, and have a TV connect to it over Lan?
The TV could, in theory, access a media server that is running on the router, I am, however, experiencing quite some difficulty with connecting the TV over Wlan to the Media server on the router, therefore a Lan connection would probably be a better solution.
(Both devices are in different rooms, a Lan connection to the router is sadly not possible)
I have a 2012 Samsung smart TV which has a dlna client. Like you, I cannot link my TV directly to the router using Ethernet cable. My Raspberry Pi 4 replaces (and works better than) a 2012 Seagate Goflex NAS (it died) which also had minidlna running. To connect the TV to the router I used what are called powerline adapters. They plug into AC outlets and use your house wiring. One near the TV and one near the router. The ones I use I bought in 2012 and are 300 Mbit rated and I can stream 1080p 50Hz with no problems or freezes. Mine are TP-Link like the picture but there are plenty of other brands. They cost from $50 per pair upwards. You pay more for higher speeds. Search for 'powerline adapter'.
Another solution might be to use 'wifi extenders' which work the same way. This would extend the wifi coverage for all devices in the area near the remote adapter.
