Convert WMV to MP3 - extract audio
WMV files carry WMA audio inside a Microsoft container. Wave discards the video, decodes the WMA - v1, v2, or Pro - and re-encodes it to a portable 192 kbps MP3 that plays on any device.
What actually changes
A WMV file is an Advanced Systems Format container holding WMV video plus a WMA audio track. WMA v1 (rare, pre-2000), WMA v2 (the common consumer format from around 2000 onward), and WMA Pro (higher-bitrate, sometimes multi-channel) are all decodable by Wave's LGPL-clean wasm ffmpeg core. WMA Voice - a narrow-band variant used for lectures and dictation - is also handled.
Because the video track is discarded entirely, extract is fast - often ten times faster than converting the same WMV to MP4. An hour-long lecture WMV typically re-encodes to MP3 in under a minute on a modern laptop. Wave uses LAME (libmp3lame) at VBR around 190 kbps average, which is transparent for speech and for the vast majority of music content.
Three steps.
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Step 1
Drop the WMV file onto the card.
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Step 2
Pick MP3 as the output format.
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Step 3
Convert and save the MP3.
Answers, specifically.
DRM-protected WMV - does it work?
No. Windows Media DRM (PlaysForSure) can only be decoded by Microsoft's own player. Wave, running purely in the browser, has no way around that. Unprotected WMV - which is nearly everything not from a paid store - converts fine.
Will my old lecture recording sound tinny?
Some lecture WMVs use WMA Voice, a narrow-band codec designed for speech that caps audio bandwidth around 4 kHz. Wave decodes it correctly, but the source bandwidth is what it is - the MP3 will sound as clear as the WMA did, no better and no worse.
Is 5.1 WMA Pro downmixed?
Yes. Wave downmixes multi-channel WMA Pro to stereo before encoding to MP3. If you need the surround field preserved, MP3 is the wrong target - it doesn't hold multi-channel audio at all.
How long does an hour-long WMV take?
Typically 30–60 seconds on a modern laptop. Because there's no video decode at all, extract runs several times faster than a full WMV-to-MP4 conversion.
What if my file is audio-only (a .wma)?
Wave rejects audio-only sources up front - it's a video-to-audio extractor, not an audio-to-audio converter. For a plain .wma, a dedicated audio-conversion tool is the right fit.