m4Bookmaker

m4Bookmaker is a Mac & Windows app for building properly-chaptered M4B audiobooks from folders of MP3s — with a visual chapter editor, automatic audio repair, and no ffmpeg setup required. 

https://m4bookmaker.sageframe.net/

v1.0.3

v1.0.3 — Metadata Fix + Edit Mode

What's new in 1.0.3: Fixed a bug where opening an M4B to edit chapters would strip the book's Title, Author, Narrator, and Genre. All metadata fields now save correctly.

What's new in 1.0.2:

• Edit mode — Open any existing M4B file to review and update its chapter list without re-encoding. Cover art, metadata, and duration are pre-filled automatically.
• Add Chapter — Insert a new chapter at the current playhead position in Edit mode.
• Millisecond-precision timestamps — Chapter times are displayed and editable to the millisecond.
• Direct timestamp editing — Click any timestamp cell to edit it in place.
• macOS fix — Resolved a hang that could occur when loading M4B files on macOS.