Jellyfin works well except that if you’re not transcoding, you’ll need Infuse for (IIRC?) a couple not-ubiquitous-but-not-rare audio codecs that Apple TV doesn’t natively support.

I use Infuse with Jellyfin. My server’s way too weak for reliable transcoding, plus not using it avoids a large proportion of bugs in the Jellyfin issues tracker at any given time.