Convert MPEG-4 Audiobook (.m4b) to Audio Video Interleave (.avi) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .m4b file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .avi file when it's ready.
Converting M4B audiobooks to AVI places spoken-word audio inside Microsoft's legacy video container. This atypical conversion targets legacy Windows systems — kiosk displays, training computers, and media players from the early 2000s — that only play AVI files. The audio is re-encoded from AAC to PCM or MP3 inside the AVI container, and chapter markers from the M4B are lost entirely.
Certain legacy educational and training systems deployed in corporate and institutional settings only support AVI playback. Libraries and educational institutions with older computer labs may have AVI-locked media players. Converting audiobook content to AVI allows distribution through these constrained environments.
FFmpeg decodes the M4B's AAC audio and re-encodes as PCM or MP3 inside an AVI container. AVI does not support AAC natively, so re-encoding is required. For audio-only AVI, some players may require a minimal video track (single static image). Chapter and bookmark data from M4B are completely discarded.
PCM in AVI preserves the decoded M4B quality losslessly (but produces large files). MP3 at 128 kbps provides equivalent quality to the M4B for spoken word. Since M4B content is typically 32-64 kbps AAC speech, even modest MP3 bitrates reproduce the content faithfully.
| Device | M4B | AVI |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
M4B to AVI is a niche legacy conversion. Unless your target system specifically requires AVI, use M4A or MP3 for broader compatibility with modern and legacy systems alike.
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| No |
| Egenskap | M4B | AVI |
|---|---|---|
| Fullt navn | MPEG-4 Audiobook | Audio Video Interleave |
| Filendelse | .m4b | .avi |
| Best egnet for | Chapter support | Windows native |