Convert MPEG-4 Audio (.m4a) to Windows Media Video (.wmv) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .m4a 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 based on ASF. Converting M4A audio to WMV wraps audio inside a video-oriented container — a specialized operation for legacy Windows enterprise systems, digital signage, and older versions of Microsoft Office that embed WMV multimedia. The audio is re-encoded as WMA inside the WMV container, optionally paired with a static image as a placeholder video track.
Legacy corporate systems, training platforms built on Windows Media technology, and older versions of PowerPoint embed WMV as their multimedia format. Digital signage systems from the Windows Embedded era often only play WMV files. Converting M4A audio to WMV provides audio content through these WMV-only channels.
FFmpeg decodes the M4A audio and re-encodes as WMA (wmav2) inside a WMV/ASF container. For a valid WMV file, a minimal video track is typically needed — a static image encoded with WMV2 or VC-1. WMV supports WMA and MP3 audio codecs. AAC is not supported within WMV/ASF containers.
Audio quality depends on the WMA bitrate. At 192+ kbps, quality is good. The WMV container adds no quality overhead. Converting from AAC M4A to WMA involves a generational lossy-to-lossy conversion.
| Device | M4A | WMV |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Native | Partial |
| iPhone/iPad | Native | 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
M4A to WMV is a legacy conversion for Microsoft enterprise environments. Unless your target system requires WMV specifically, use MP4 for universal modern compatibility.
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| No |
| Tính năng | M4A | WMV |
|---|---|---|
| Tên đầy đủ | MPEG-4 Audio | Windows Media Video |
| Phần mở rộng | .m4a | .wmv |
| Phù hợp nhất cho | Better than MP3 | Windows native |