How to Convert WMV to MP4

WMV (Windows Media Video) is Microsoft’s video format. It works perfectly in Windows Media Player and on older Windows systems but creates problems everywhere else — Macs, iPhones, Androids, smart TVs, web platforms. Converting to MP4 fixes this.

The fastest path: HandBrake

HandBrake (free, cross-platform):

Install HandBrake
Open it, drag in your .wmv file
Choose preset: “Fast 1080p30” or appropriate
Set output filename ending in .mp4
Click Start Encode

WMV → MP4 always requires re-encoding (the video codec, WMV/VC-1, isn’t compatible with MP4 containers). HandBrake handles this transparently.

With FFmpeg

ffmpeg -i input.wmv -c:v libx264 -c:a aac output.mp4

Re-encodes video and audio to H.264 + AAC, packaged in MP4.

Why WMV is limited today

Windows-centric: native playback only on Windows
No iPhone playback: even with apps
Limited web support: most browsers and platforms don’t accept WMV uploads
Proprietary codec: WMV/VC-1 had licensing issues that limited cross-platform adoption
Older compression: less efficient than H.264

The replacement: MP4 with H.264, supported universally.

What gets preserved

Preserved:

Video content (re-encoded but visually similar)
Audio
Most metadata

Affected:

Quality (slight degradation from re-encoding; minimal at “Fast 1080p30” preset)
File size (varies; typically similar to original)
DRM-protected WMVs cannot be converted (Windows Media DRM-protected files require licensed playback)

Encrypted or DRM-protected WMV

Some WMV files (especially from older Windows Media subscription services) have DRM protection that prevents conversion. Legitimate tools cannot bypass this:

“Plays for Sure” files
Old Windows Media Center recordings (with DRM)
Some commercial content

If conversion fails with DRM-related errors, the file is protected. Legitimate purposes (your own home recordings without DRM) shouldn’t hit this issue.

On phone

For mobile WMV conversion:

iPhone/Android: third-party converter apps (varying quality)
Desktop conversion is typically more reliable

After conversion

Extract audio: MP4 to MP3 for audio-only
Compress: see Compress Video
Trim: see Trim or Cut Video
Rotate if needed: see Rotate a Video

TL;DR

WMV → MP4: requires re-encoding (codecs differ)
Best tool: HandBrake (free, GUI)
Command-line: ffmpeg -i input.wmv -c:v libx264 -c:a aac output.mp4
DRM-protected WMVs: cannot be converted
Why convert: WMV is Windows-only; MP4 plays everywhere