The M4B file extension is an MPEG-4 Audio Book file. It’s used by iTunes for audiobooks. I have a ton of audiobooks and would love to access them from anywhere via my plex server. I believe you already support .M4A files for music, so maybe the additional code would be simple to add? The advantage …

Please add support for playback M4B audio books

Forkboy December 31, 2019, 12:38am 2

You’d be better adding your vote to this thread
https://forums.plex.tv/t/support-for-audiobooks/
rather than trying to start a new one.

Topic		Replies	Views
[Request] .m4b Support and Audiobooks Feature Suggestions	6	319	June 10, 2021
Support for Audiobooks? General Discussions	23	1191	December 21, 2019
Plex Server cannot reliably track M4B audiobook files, nor is it possible to use embedded metadata tags for this purpose using available Plex players Desktops & Laptops library-management	2	2692	September 30, 2019
[req] long form audio/chapterized aac/m4a/m4b support Feature Suggestions	3	179	February 23, 2018
It would be Really nice to get proper audiobook support... Feature Suggestions	2	199	August 3, 2018