What is MPEG-4 audiobook?
An MPEG-4 audio container commonly used for audiobooks and spoken-word recordings.
Output uses AAC. Chapters, bookmarks, cover art and DRM are not retained.
Technical details
M4A and M4B are audio-focused ISO Base Media/MP4 files; audio samples live in timed tracks and may carry chapter or metadata atoms. [1]
Background and compatibility
M4A is commonly used for general MPEG-4 audio while M4B is associated with audiobook/chapter workflows; both remain MP4-family containers. [1]
Sources and references
- FFmpeg Formats DocumentationFFmpeg Project
Preview on your device
Playback when the browser supports the audio codec.
Conversion support
Choose a file in the workspace to see the available output formats and options. A supported container may still contain an unsupported codec.
Read the format reference on Wikipedia ↗Technical format documentation ↗