SABnzbd Forums

Does any one have an audiobook postprocessing script to convert multiple .mp3 files into one .m4b file?
I use readarr to find and send the audiobooks to sabnzbd. But would like to have sabnzbd run a script to convert the many mp3's to one m4b before telling readarr that its done downloading.
I have found many dockers that will do this but nothing that will automate this between sabnzbd and readarr.

How do you actually do this conversion?
What kind of software do you use to convert multiple .mp3 to one .m4b?

Maybe this software has some kind of command-line function that you could use?