How to convert M4B to OGG
- Add your .M4B file - drop it in the box above or click to browse.
- Convert it to .OGG in a few seconds.
- Download your new .OGG file.
What to expect
- Re-encoding AAC to Vorbis or Opus is a lossy-to-lossy process - some quality is lost, though it is rarely audible in spoken-word content at 64 kbps or higher.
- Chapter markers and bookmarking data stored in the
M4Bcontainer are not carried into OGG; the output is a single continuous audio file with no chapter navigation. - DRM-protected
M4Bfiles purchased from iTunes cannot be converted by any free tool; only DRM-free files (such as Librivox downloads) work.
Frequently asked questions
Will the OGG file keep the title, author, and cover art?
Basic tags such as title, artist, and album are copied into OGG comment fields, but cover art is dropped from Vorbis files by default.
Which codec is better for an audiobook - Vorbis or Opus?
Opus produces noticeably better quality at the same bitrate, especially below 96 kbps; use
-c:a libopus -b:a 64k if your player supports .opus files.Can I split the M4B chapters into separate OGG files?
Not automatically - the converter outputs one continuous file; to split by chapter, use
ffmpeg with the -ss and -to flags for each chapter timestamp individually.Why can't I convert my M4B from iTunes?
iTunes M4B files are protected by FairPlay DRM, which prevents decoding by ffmpeg or any free converter; only DRM-free M4B files can be converted.
Programs that convert M4B: MediaMonkey · Aimersoft DRM Media Converter for Windows · Helium Music Manager · Pavtube HD Video Converter for Mac
