[sandreas]

Thanks... :-) tone is mainly, because m4b-tool / mp4v2 was not capable of writing `movement` and `movement-number` tags, which I use for series and series-part and intelligent playlists in iTunes. Of course coding m4b-tool in PHP was not the best idea (no multithreading), so I had to find a possibility to integrate multiple threads with workarounds. It works, but with tone and C# these are no longer limitations I have.

Audiobookshelf is evolving very quickly, so maybe one day it will provide these features. There are some rough edges, though.

I also considered audioserve + app [1], but I did not have the time to try it out.

[1] https://github.com/izderadicka/audioserve