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m4b-mp3-chapters-from-cuesheets
merge audiobooks or podcasts without re-encoding (remuxing only) to single m4b with quicktime/nero chapters or mp3 with id3v2 chapters using cuesheets; also allows for renaming/editing chapters
You could also merge the chapter tracks into a single file with embedded chapters, but I think there is a chapter limit of 255 for m4b files, mp3 I’ve had issues with large chapter numbers as well but I’m unsure what the limit is. There’s a guide here on doing that https://github.com/TheMetalCenter/m4b-mp3-chapters-from-cuesheets thought it is windows only.
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CodeRabbit
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m4b-tool
m4b-tool is a command line utility to merge, split and chapterize audiobook files such as mp3, ogg, flac, m4a or m4b
However, I only went through the trouble because I didn't want audio quality to be affected at all (nothing to be encoded again, only removed). If you are not too concerned about audio quality, there is definitely programs out there on Mac that can chapterize files. M4btool is pretty powerful and there is Audiobook converter. I've heard AudioBookBinder might work as well, though I think it is older at this point.
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AudioBookConverter
Improved AudioBookConverter based on freeipodsoftware release (mp3 to m4b converter)
However, I only went through the trouble because I didn't want audio quality to be affected at all (nothing to be encoded again, only removed). If you are not too concerned about audio quality, there is definitely programs out there on Mac that can chapterize files. M4btool is pretty powerful and there is Audiobook converter. I've heard AudioBookBinder might work as well, though I think it is older at this point.