Convert WMV to WAV Online
Extract audio from WMV video to lossless WAV, free, in your browser.
.wmv · up to 100 MB
What it's for
WMV to WAV: corporate audio ready for transcription
Meeting transcription
Prepare WMV recordings from Lync, Skype for Business, or Webex for Whisper or Azure Speech.
Uncompressed PCM
WMA decoded to PCM for maximum fidelity in downstream audio processing.
DAW-ready
WAV importable directly into Audacity, Adobe Audition, Reaper, or any DAW.
100% private
Corporate recordings are processed in your browser. They never leave your device.
How it works
Three steps, no hassle
Upload your WMV file
Drag or select your .wmv file. Corporate recordings, narrated presentations, meeting archives. Up to 200 MB.
PCM audio extraction
FFmpeg decodes the WMA stream from the WMV and outputs an uncompressed PCM WAV file. No server uploads.
Download and use the WAV
The resulting WAV is compatible with any transcription software, DAW, or speech-to-text tool.
FAQ
Got questions?
WMV files were the standard recording format for meetings, webinars, and corporate presentations in Windows environments during the 2000s and early 2010s. Microsoft Office Communications Server, Lync, and early versions of Skype for Business saved meetings as WMV. Many organizations have archives of historical meetings, training sessions, and executive presentations in WMV that need transcribing for documentation, regulatory compliance, or content indexing. Extracting audio as PCM WAV is the necessary prerequisite for transcription tools like Whisper (OpenAI), Azure Speech-to-Text, Google Speech-to-Text, or AWS Transcribe, which require uncompressed audio or standard formats.
WMV files can contain several variants of the WMA (Windows Media Audio) codec: WMA Standard (WMA v7, v8, v9), WMA Lossless (WMA v9 lossless), and WMA Voice (optimized for low-bitrate voice, used in meeting recordings). The WMA stream is fully decoded to PCM (Pulse Code Modulation) without loss during conversion to WAV. PCM is the standard uncompressed audio format (Microsoft's RIFF WAVE specification from 1991): audio samples are stored as direct numerical values with no compression algorithm, guaranteeing maximum fidelity for downstream processing.
Yes. PCM WAV at 44.1 kHz or 48 kHz is the preferred input format for major transcription APIs: OpenAI Whisper accepts PCM WAV directly; Azure Speech Services recommends 16kHz mono PCM WAV for speech-to-text; Google Cloud Speech-to-Text supports PCM WAV with LINEAR16 encoding; AWS Transcribe accepts PCM WAV. To optimize file size for voice transcription, you can convert the stereo WAV to mono and downsample to 16 kHz using Audacity, since human speech contains no meaningful information above 8 kHz.
Yes. PCM WAV is the native working format in Adobe Audition, Audacity, Reaper, Pro Tools, Logic Pro, and any DAW. Importing the WAV into Audacity lets you apply noise reduction (using the background noise profile from the recording), amplitude normalization, room echo removal, and export the clean result back to WAV or MP3. For older corporate recordings with HVAC noise or room rumble, these Audacity filters significantly improve intelligibility for transcription.
A PCM WAV file is considerably larger than the compressed WMA stream inside the WMV. A 1-hour meeting recording in WMV might be 200–500 MB (including video). The compressed WMA audio extracted from that meeting could be 30–80 MB. The same audio decoded to PCM WAV at 44.1 kHz stereo 16-bit will occupy approximately 606 MB per hour (44100 samples × 2 channels × 2 bytes × 3600 seconds). For transcription-only use, converting to mono 16kHz 16-bit yields roughly 115 MB per hour — manageable for any tool.
No. WMV files protected with Windows Media DRM — common in content purchased from Microsoft stores, licensed training videos, or corporate content with usage restrictions — require the DRM decryption key to decode the audio stream. FFmpeg cannot decode DRM-protected WMV streams. It only works with unprotected WMV files.
Convert WMV to WAV: corporate audio for transcription and editing
Windows Media Video (WMV) was launched by Microsoft in 1999 as part of Windows Media Player and DirectX Media. The WMV format — based on the VC-1 codec (formerly WMV9, standardized by SMPTE in 2006 as VC-1) for video and WMA (Windows Media Audio) for audio — became the standard recording format for meetings, presentations, and corporate training in the Windows ecosystem throughout the 2000s and early 2010s. Microsoft Office Communications Server 2007, Microsoft Lync 2010, and Lync 2013 saved meeting recordings as WMV files. Windows Media Encoder, bundled free with Windows XP and Vista, was the standard tool for capturing webinars and screen presentations as WMV. As a result, a large body of corporate archival material exists in WMV: process documentation, internal training sessions, historical executive presentations, and board meetings recorded over an entire decade.
The need to extract WMV audio to WAV arises primarily in two contexts: transcription and audio editing. For transcription, organizations that need to document the content of historical meetings, create subtitles for training material, or index recordings for internal search need to convert audio to a format accepted by speech-to-text APIs. OpenAI Whisper (released September 2022), the highest-accuracy open-source transcription model available, works natively with PCM WAV. Azure Cognitive Services Speech and Google Cloud Speech-to-Text both recommend PCM WAV as the input format for maximum accuracy. For audio editing, PCM WAV is the standard working format in any professional DAW. A podcast producer who records interviews via Skype for Business will receive audio as WMV; extracting it to WAV is the first step of the production workflow before editing in Adobe Audition or exporting to MP3.
Convertir.ai performs the WMV-to-WAV audio extraction entirely in the browser using FFmpeg.wasm. The technical process involves: demuxing the ASF (Advanced Systems Format) container — Microsoft's encapsulation format for both WMV and WMA — to separate the WMA audio stream from the VC-1 video stream; decoding the WMA stream using libavcodec (supporting WMA Standard v1/v2, WMA Pro, and WMA Lossless) to 32-bit floating-point PCM internally; converting to signed 16-bit PCM at the original sample rate (typically 44.1 kHz or 48 kHz for corporate recordings); wrapping in the standard RIFF WAVE container with the fmt and data chunks. The resulting WAV file is bit-perfect relative to the original audio before WMA compression, with no re-encoding artifacts introduced. For meeting recordings up to 2 hours, FFmpeg.wasm processes the file in the browser without requiring an internet connection after the page loads.