Similar boat...I'd also like to swap off Plex but a few of my less techie friends use it and I'm worried about the compatibility/ease of setup of Jellyfin on their devices.
Thought about running both in parallel but that seems like a waste. Think I just need a migration day eventually
I've never run Plex, or Jellyfin for that matter. There's a video share on my NAS.
I point Infuse on Apple TV 4K's at it. It works, and cleanly.
Downsides: you have to pay for Infuse Pro to play some formats and deal with some audio codecs. It's IIRC $17 for a year, though, so pretty reasonable for continued development. Your non-technical friends and family can't do the initial setup themselves (it's shared over Tailscale, they can all use the same limited account on your plan), but anyone I'm going to let do this can ship me their Apple TV 4K and let me set it up for them.
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Jellyfin has been fine "around the house" but I don't know about remote access as I've not needed it.
Jellyfin + Infuse + AppleTV is basically bulletproof; however Swiftfin as a client has been working fine.
Yeah nothing is as turnkey as plex, hard to give that up if you’re running a little streaming service for friends and family haha