My jellyfin installation chokes on audiobooks. There is a very noticeable pause between each track that it plays, despite the entire thing being queued.

That pause is presumably also present when playing music, but no one notices because each song is its own track. Audiobook tracks split in places where a pause would never occur naturally.

The second-most-annoying trait of Jellyfin in my experience is technically not a bug, but should definitely be fixed. It hardcodes expectations of how to determine what season and episode number to assign to files. And if you overwrite them, it will re-mangle them on scan unless you take precautions to stop it.

As far as Jellyfin is concerned, your files must include a tag of the form S__E__ somewhere in the filename. Being located in a folder called "Season 2" with names like "11 - name of episode" won't work. Substrings like 第2集 won't work. Setting actual metadata tags on the file ( https://wiki.multimedia.cx/index.php/FFmpeg_Metadata ) doesn't work; jellyfin ignores them.

Let me provide a per-folder template for extracting season / episode information. Jellyfin already lets you prefer embedded artwork to whatever it finds on the internet. Why enforce hallucinated episode numbers when explicit ones are clearly present?