Extract Audio from WMV to AIF — Free Online Tool
Extract audio from WMV video files and save it as AIF, converting the compressed WMA (wmav2) audio stream into uncompressed PCM audio at CD-quality 16-bit big-endian resolution. Ideal for recovering clean, lossless audio from Windows Media Video recordings for use in Mac-based audio workflows.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your WMV file here
or click to browse
Free — no uploads, no signups. Your files never leave your browser.
Settings
Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
WMV files store audio using the WMA codec (typically wmav2), which is a lossy, proprietary Microsoft compression format. During this conversion, FFmpeg discards the video stream entirely and decodes the wmav2 audio to raw PCM samples, then writes them into an AIF container using the pcm_s16be codec — 16-bit signed PCM in big-endian byte order, the native format for AIF files developed by Apple. Because the WMA source is lossy, the output AIF will be uncompressed and lossless at that fidelity level — meaning no additional quality is lost in this step, but the audio quality ceiling is set by the original WMA encoding. The result is a large, uncompressed audio file that is fully compatible with macOS audio tools, DAWs, and any AIF-aware application.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg tool, which handles all decoding, stream processing, and encoding. In the browser version, this runs via FFmpeg.wasm compiled to WebAssembly — no installation required and no files leave your device. |
-i input.wmv
|
Specifies the input WMV file. FFmpeg reads the ASF container, identifies the wmav2 audio stream and the msmpeg4 video stream, and prepares them for processing according to the subsequent flags. |
-vn
|
Disables video output entirely, discarding the msmpeg4 video stream from the WMV. Since AIF is a pure audio format with no video container support, this flag ensures only the audio track is processed and written to the output file. |
-c:a pcm_s16be
|
Decodes the lossy wmav2 audio from the WMV and re-encodes it as 16-bit signed big-endian PCM — the native uncompressed audio codec for the AIF format. This produces a lossless, uncompressed representation of whatever audio quality existed in the WMA source stream. |
output.aif
|
Sets the output filename and tells FFmpeg to write an AIF container. FFmpeg infers the AIF format from the .aif file extension, correctly pairing it with the pcm_s16be codec and applying the big-endian AIFF structure expected by macOS applications and DAWs. |
Common Use Cases
- Importing audio from Windows Media Video corporate training recordings into Logic Pro or GarageBand for editing on a Mac
- Extracting voiceover or narration from a WMV presentation file to use as a lossless source in a podcast production workflow
- Archiving the audio track from WMV home videos or camcorder exports as uncompressed AIF before the original WMV source degrades or is lost
- Pulling music or audio beds from WMV content received from Windows-based collaborators for integration into a Mac-native audio project
- Preparing audio extracted from WMV screencasts or tutorials for further noise reduction or mastering in a professional DAW that prefers uncompressed AIF input
- Converting WMV audio tracks to AIF for compatibility with Apple's Final Cut Pro or other Mac video editors that natively handle AIF audio
Frequently Asked Questions
No — the AIF output will not exceed the quality of the original WMV's wmav2 audio. WMA (wmav2) is a lossy codec, meaning some audio information was permanently discarded when the WMV was originally encoded. Converting to AIF preserves every bit of what remains in that lossy source without any further degradation, but it cannot recover detail that was already lost. Think of it as putting the lossy audio into a lossless container — the container is pristine, but the content inside reflects the original WMA quality ceiling.
WMV files compress audio using WMA (wmav2), which can achieve significant size reduction through lossy compression. AIF with pcm_s16be stores raw, uncompressed audio samples — every sample occupies a fixed amount of space regardless of the audio content. A stereo 16-bit AIF at 44.1kHz requires roughly 10MB per minute of audio, while WMA audio in a WMV might only use 1–2MB per minute at typical bitrates. This size increase is expected and normal for any conversion to an uncompressed format.
WMV files store metadata in the ASF container using Windows Media metadata attributes. AIF supports limited metadata through its ANNO and NAME chunks, but FFmpeg's mapping between ASF and AIF metadata is not comprehensive. Some basic tags like title may transfer, but artist, album, and other extended WMA metadata fields are likely to be dropped or not recognized by AIF-reading applications. If metadata preservation is important, review and re-tag the AIF file after conversion using a tool like Kid3 or iTunes.
Yes — AIF supports several PCM variants beyond the default pcm_s16be. You can substitute pcm_s24be for 24-bit depth or pcm_s32be for 32-bit by changing the -c:a flag in the FFmpeg command. For example, use 'ffmpeg -i input.wmv -vn -c:a pcm_s24be output.aif' to produce a 24-bit AIF. However, since the WMV source uses lossy WMA audio, upsampling to a higher bit depth does not recover lost quality — it simply stores the same decoded audio in a larger container. 24-bit output may still be preferable for downstream mastering workflows that expect higher-depth source files.
FFmpeg cannot process DRM-protected WMV files. WMV supports Microsoft's DRM system, and if a file is protected, FFmpeg will typically return an error or produce a silent/empty output. This tool processes only the raw file you provide in your browser — it cannot decrypt or bypass DRM. If you encounter this issue, the WMV file was likely purchased or downloaded from a DRM-enabled service and must be handled through licensed software or the originating platform.
The displayed command processes a single file, but you can batch process on your desktop using a shell loop. On macOS or Linux, run: 'for f in *.wmv; do ffmpeg -i "$f" -vn -c:a pcm_s16be "${f%.wmv}.aif"; done'. On Windows Command Prompt, use: 'for %f in (*.wmv) do ffmpeg -i "%f" -vn -c:a pcm_s16be "%~nf.aif"'. This is especially useful for files over 1GB, which exceed the in-browser tool's limit and are better handled by a local FFmpeg installation.
Technical Notes
The AIF container uses big-endian byte ordering inherited from its Apple/Motorola heritage, which is why the default codec here is pcm_s16be (signed 16-bit big-endian PCM) rather than the little-endian pcm_s16le used in WAV files. FFmpeg correctly handles this byte order during the wmav2 decode-to-PCM pipeline. The WMV/ASF container can theoretically hold multiple audio tracks; this command extracts the first audio stream by default — if your WMV has multiple audio tracks, add '-map 0:a:1' to target a specific one. Sample rate is preserved from the source WMV during decoding, so if the WMA audio was encoded at 44.1kHz or 48kHz, the AIF will match that rate without resampling. The -f asf flag is not needed on the output side since AIF has its own recognized extension. One known limitation: some WMV files from older Windows Movie Maker exports use msmpeg4v2 video and wmav2 audio at low bitrates (64k or 96k), which will result in noticeably thin-sounding AIF output — the uncompressed container cannot compensate for source material that was heavily compressed at creation.