Extract Audio from WMV to OGG — Free Online Tool
Extract audio from WMV files and convert it to OGG format using the Vorbis codec — ideal for moving Windows Media Audio streams into an open, patent-free container that plays natively in Firefox, Chromium-based browsers, and Linux media players. The WMV's proprietary WMA audio is re-encoded to Vorbis, producing a universally accessible OGG file without any video overhead.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
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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 use Microsoft's Advanced Systems Format (ASF) container, and their audio tracks are almost always encoded with the WMA v2 (wmav2) codec — a proprietary Microsoft format that many open-source and Linux-based players cannot decode. During this conversion, FFmpeg reads the ASF container, discards the video stream entirely using the -vn flag, and re-encodes the WMA audio stream using the libvorbis encoder into an OGG container. Vorbis is a lossy codec like WMA, so this is a lossy-to-lossy transcode: there is a small generational quality loss, but at quality level 4 (the default), the output is perceptually transparent for most listeners. The resulting OGG file contains only the Vorbis audio stream with no video data, significantly reducing file size.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg multimedia processing tool. In this browser-based tool, FFmpeg runs locally via WebAssembly (FFmpeg.wasm), so no file data is sent to any server. |
-i input.wmv
|
Specifies the input file — a WMV file using Microsoft's ASF container, typically carrying a WMA v2 audio track and an MPEG-4 Part 2 video track. FFmpeg automatically detects the ASF format and probes all contained streams. |
-vn
|
Disables video output entirely, telling FFmpeg to skip the WMV's video stream. This is what makes the output a pure audio file rather than a video file — the msmpeg4 video track in the WMV is read but never written to the output. |
-c:a libvorbis
|
Selects the libvorbis encoder to re-encode the WMA audio from the WMV source into Vorbis format. Vorbis is the default and most widely supported codec for OGG containers, and libvorbis is Xiph.Org's official reference encoder. |
-q:a 4
|
Sets the Vorbis variable bitrate quality to level 4 on a scale of 0–10, targeting approximately 128 kbps. This is a quality-based setting (unlike WMV's fixed bitrate -b:a parameter), meaning the encoder allocates more bits to complex audio passages and fewer to silence, resulting in more efficient compression than a fixed bitrate would produce. |
output.ogg
|
Defines the output filename and tells FFmpeg to write the Vorbis audio stream into an OGG container. FFmpeg infers the OGG container format from the .ogg file extension, requiring no additional format flags. |
Common Use Cases
- Extracting the audio track from a WMV lecture or webinar recording to publish as a podcast episode on platforms that accept OGG audio
- Converting Windows Media Player music videos or concert recordings saved as WMV into OGG files for use in open-source game engines like Godot, which natively support OGG Vorbis
- Stripping audio from WMV corporate training videos to create OGG-format audio guides that play in Firefox or Chromium browsers without plugins
- Moving a WMV audiobook or spoken-word recording out of Microsoft's proprietary ecosystem into an open format compatible with Rockbox firmware on MP3 players
- Extracting WMV audio from old Windows Movie Maker projects to archive as OGG files alongside other open-format media in a Linux-based media library
- Converting WMV screencasts or tutorial videos to OGG audio so the narration track can be reused in a new video production or edited in Audacity
Frequently Asked Questions
Yes, there is a small degree of generational quality loss because both WMA (the typical audio codec in WMV) and Vorbis are lossy codecs. Re-encoding from one lossy format to another introduces additional compression artifacts on top of those already present in the source. At the default quality level of -q:a 4, the Vorbis output is generally considered perceptually transparent for music and speech, so the loss is minimal in practice, but it is not a lossless transfer. If quality is critical, consider using the highest Vorbis quality setting (-q:a 10) to minimize additional degradation.
OGG Vorbis has excellent support in Firefox, Chrome, and Edge on desktop, as well as in VLC, mpv, and most Linux media players. However, Safari on macOS and iOS does not natively support OGG Vorbis playback, which is a notable limitation if your audience uses Apple devices. For maximum cross-platform compatibility including Safari, you would need to use a different output format such as MP3 or AAC. On the open-source side — including Godot, Blender, and most Linux applications — OGG Vorbis is the preferred audio format.
The video track is completely discarded. The -vn flag in the FFmpeg command explicitly instructs FFmpeg to ignore all video streams in the input WMV file. Only the audio track is processed and re-encoded as Vorbis into the OGG container. The resulting output file is a pure audio file with no video data, which is why it will be dramatically smaller than the original WMV.
Adjust the -q:a value to control Vorbis quality. The scale runs from 0 (lowest, roughly 64 kbps) to 10 (highest, roughly 500 kbps), with 4 (approximately 128 kbps) as the default used here. For example, replace '-q:a 4' with '-q:a 6' for higher quality at around 192 kbps, or '-q:a 2' for a smaller file at around 96 kbps. Unlike WMV's bitrate-based audio parameter (-b:a), Vorbis uses variable bitrate quality targeting with -q:a, which produces more consistent perceptual quality across different audio content types.
FFmpeg will attempt to copy compatible metadata tags from the ASF container to the OGG container automatically. Common tags like title, artist, album, and date are typically mapped across formats. However, WMV files sometimes use Windows Media-specific metadata fields that have no direct OGG Vorbis Comment equivalent, and those fields may be dropped. OGG supports rich Vorbis Comment metadata, so if your WMV has standard tags, they should survive the conversion intact.
Yes. On Linux or macOS, you can use a shell loop: 'for f in *.wmv; do ffmpeg -i "$f" -vn -c:a libvorbis -q:a 4 "${f%.wmv}.ogg"; done'. On Windows Command Prompt, use: 'for %f in (*.wmv) do ffmpeg -i "%f" -vn -c:a libvorbis -q:a 4 "%~nf.ogg"'. The browser-based tool on this page processes one file at a time, but the displayed FFmpeg command is ideal for desktop batch processing — especially useful if you have a large collection of WMV files or files exceeding 1GB.
Technical Notes
WMV files are built on the Advanced Systems Format (ASF) container, which requires the special flag '-f asf' when outputting to WMV — though when using WMV as input, FFmpeg detects the format automatically without any special flags. The most common audio codec found in WMV files is WMA v2 (wmav2), a proprietary Microsoft codec that achieves similar quality-to-bitrate ratios as MP3 but is not freely decodable on all platforms without licensing considerations. The OGG container output here uses libvorbis, Xiph.Org's reference Vorbis encoder, which is fully patent-free and open-source. OGG supports chapter markers (a feature WMV lacks), multiple audio tracks, and rich Vorbis Comment metadata, but does not support subtitles or video streams in this context. One practical limitation: if a WMV file has DRM (Digital Rights Management) protection — a feature the ASF container explicitly supports — FFmpeg will be unable to decode the audio stream, and the conversion will fail. Only unprotected WMV files can be processed by this tool.