.m4b MPEG-4 audio book
Audio
| MIME type | audio/x-m4b |
|---|---|
| Description | MPEG-4 audio book |
| Category | Audio |
| Based on | audio/mp4 |
| Other extensions | .f4b |
Frequently asked questions
What is a .m4b file?
A .m4b file is a “MPEG-4 audio book” (MIME type audio/x-m4b).
How do I open a .m4b file?
With a media player such as VLC, which plays almost every audio format; on Windows also Media Player, on macOS Music or QuickTime. To edit it, use Audacity for example.
How can you tell a genuine .m4b file?
No fixed signature at the start of the file is registered for this format; it is recognised mainly by its extension. On Linux and macOS, file --mime-type example.m4b shows the guessed type.
Which format is .m4b based on?
Technically a .m4b file is a subtype of “MPEG-4 audio” (audio/mp4), so programs for that base format can often read it too.
Which MIME type belongs to .m4b?
The MIME type is audio/x-m4b. In the Apache web server: AddType audio/x-m4b .m4b; in nginx: types { audio/x-m4b m4b; }.