Convert MPEG-4 Audiobook (.m4b) to Windows Media Video (.wmv) 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 .wmv file when it's ready.
WMV (Windows Media Video) is Microsoft's video container. Converting M4B audiobooks to WMV wraps narration inside a video container with WMA audio encoding and optionally a static cover image as a video track. This legacy conversion targets enterprise Windows environments — corporate training systems, digital signage, and LMS platforms from the Windows Media era that only accept WMV multimedia files.
Corporate training platforms built on Windows Media technology may only accept WMV uploads. Enterprise LMS (Learning Management Systems) from the early 2000s often use WMV as their sole multimedia format. Digital signage systems in corporate lobbies and training rooms may require WMV for audio content display. Converting M4B audiobooks to WMV with a book cover as the video creates a 'video' suitable for these systems.
FFmpeg decodes the M4B's AAC and re-encodes as WMA (wmav2) inside a WMV/ASF container. A static cover image is encoded as WMV2 video to create a proper video file. Chapter and bookmark data from M4B are discarded — WMV/ASF has marker support but it does not map from M4B automatically.
WMA at 64-96 kbps provides good spoken-word quality. The video track (static image) quality is irrelevant for audiobook content. Overall audio quality is comparable to the M4B source for narration.
| Device | M4B | WMV |
|---|---|---|
| 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 WMV is a legacy enterprise conversion. It creates audiobook 'videos' for WMV-only systems. Unless WMV is specifically required, MP4 or M4A provide much broader modern compatibility.
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ทุกเบราว์เซอร์ ทุกอุปกรณ์
| No |
| ฟีเจอร์ | M4B | WMV |
|---|---|---|
| ชื่อเต็ม | MPEG-4 Audiobook | Windows Media Video |
| นามสกุล | .m4b | .wmv |
| เหมาะที่สุดสำหรับ | Chapter support | Windows native |