Interesting - I bought Emby this year for serving local media - my one gripe is no thumbnails/preview when you scrub over the timeline - this one has it. Will give it a spin.
Jellyfin is actually a fork of Emby, created after Emby went closed source.
I wondered why the UI elements looked so similar. I had tried Emby as my first media server, and then realized there were paid features, and switched to Jellyfin.
There's actually ongoing work on extremely efficient tooling for thumbnails/previews :)
That's good to hear!
For jellyfin, that is. For emby, I doubt they’ll manage to even copy the technique