MyMediaTools

Convert WMV to OGA — Free Online Tool

Convert WMV video files to OGA audio by extracting and re-encoding the Windows Media Audio stream as Ogg Vorbis — a high-quality, open-source audio codec. This tool strips the video entirely and produces a lightweight, widely-compatible OGA file, running fully in your browser without any file uploads.

FFmpeg Command

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Estimated output:

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How It Works

WMV files typically carry audio encoded in WMA (Windows Media Audio, codec wmav2) inside Microsoft's ASF container. During this conversion, FFmpeg discards the video stream entirely and transcodes the WMA audio to Vorbis, encoding it into an Ogg container with the .oga extension. This is a full audio re-encode — not a remux — because Vorbis and WMA are entirely different codecs, meaning the audio is decoded from WMA and re-compressed using the libvorbis encoder. The quality level is controlled by Vorbis's variable bitrate quality scale (-q:a 4), which targets roughly 128–160 kbps and produces transparent-quality audio for most content. Since WMV does not support lossless audio and OGA supports both lossy (Vorbis, Opus) and lossless (FLAC), this tool defaults to Vorbis for a good balance of size and quality.

What Each Flag Does

Flag What it does
ffmpeg Invokes the FFmpeg command-line tool, the underlying engine that powers this browser-based converter via its WebAssembly build (FFmpeg.wasm).
-i input.wmv Specifies the input file — a WMV file using Microsoft's ASF container, which typically contains a video stream and a WMA (wmav2) audio stream that will be decoded and re-encoded.
-c:a libvorbis Sets the audio codec to libvorbis, the open-source Vorbis encoder. This transcodes the proprietary WMA audio from the WMV file into the open Vorbis format, which is the standard audio codec for Ogg-based containers like OGA.
-q:a 4 Sets the Vorbis variable bitrate quality level to 4 on a scale of 0–10, targeting approximately 128–160 kbps. This is a good default for music and speech extracted from WMV files, balancing file size and audio fidelity after the WMA-to-Vorbis transcode.
output.oga Defines the output filename with the .oga extension, which signals an audio-only Ogg container per RFC 5334. FFmpeg uses this extension to automatically select the Ogg muxer and omit the video stream, since OGA cannot contain video.

Common Use Cases

  • Extract a music or spoken-word audio track from a WMV recording — such as a Windows Media Player rip or a legacy corporate training video — into an open-format OGA file for use in Linux media players or open-source workflows.
  • Archive the audio from old WMV screencasts or webinars in an open container format that isn't dependent on Microsoft's proprietary codec ecosystem.
  • Prepare audio from WMV lecture recordings for use in open-source e-learning platforms like Moodle, which natively support Ogg Vorbis audio.
  • Strip audio from a WMV promotional video to create an OGA background music track for use in a browser-based HTML5 application, since OGA/Vorbis is well-supported in Firefox and Chrome.
  • Convert a collection of WMV audio commentaries or podcast exports (a common output format from older Windows recording software) to OGA for long-term open-format storage.
  • Extract and re-encode WMV audio to OGA as a preprocessing step before further editing in Audacity or other open-source audio tools that prefer Ogg Vorbis input.

Frequently Asked Questions

Yes, there is some generation loss because this conversion involves two stages of lossy compression: the original WMA audio in the WMV file was already lossy, and re-encoding it to Vorbis introduces a second compression step. However, at the default quality setting (-q:a 4), Vorbis targets roughly 128–160 kbps variable bitrate, which is transparent for most listeners on typical content. If you want to minimize quality loss, consider raising the quality value to -q:a 6 or higher, which pushes Vorbis toward 192–256 kbps. There is no way to avoid re-encoding entirely, since WMA and Vorbis are completely incompatible codecs.
OGA is a strictly audio-only container based on the Ogg format. It cannot store video streams, so FFmpeg automatically drops the video track during conversion. This is intentional: the purpose of OGA is to hold audio codecs like Vorbis, Opus, or FLAC. If you need to keep the video and only change the audio codec, you should convert to OGV (Ogg Video) instead.
Yes — OGA supports FLAC as a lossless audio codec, but it's important to understand that your WMV source audio is already lossy WMA, so switching to FLAC will not recover any lost quality. The FLAC encode would be lossless relative to the decoded WMA signal, but you'd end up with a much larger file with no perceptual quality benefit over a high-bitrate Vorbis encode. To use FLAC, replace '-c:a libvorbis -q:a 4' in the FFmpeg command with '-c:a flac'.
The quality is controlled by the -q:a flag, which uses Vorbis's variable bitrate quality scale from 0 (lowest, ~64 kbps) to 10 (highest, ~500 kbps). The default value of 4 targets roughly 128–160 kbps. To increase quality, change it to a higher number — for example, 'ffmpeg -i input.wmv -c:a libvorbis -q:a 6 output.oga' will target approximately 192 kbps. For most speech content, -q:a 3 is sufficient; for music, -q:a 5 or 6 is recommended.
FFmpeg will attempt to copy standard metadata tags (title, artist, album, date, etc.) from the WMV/ASF container to the Ogg container during conversion. However, ASF and Ogg use different metadata schemes — ASF uses WMA/ASF attribute names while Ogg uses Vorbis comment fields — so FFmpeg performs a best-effort mapping. Common tags like title and artist typically transfer correctly, but proprietary ASF-specific fields or DRM-related metadata will not be preserved. You can verify or edit tags in the output file using a tool like MusicBrainz Picard.
The browser tool processes one file at a time, but if you have many files — especially those over 1 GB — you can run the FFmpeg command locally on your desktop. On Linux or macOS, you can batch process with a shell loop: 'for f in *.wmv; do ffmpeg -i "$f" -c:a libvorbis -q:a 4 "${f%.wmv}.oga"; done'. On Windows PowerShell, use: 'Get-ChildItem *.wmv | ForEach-Object { ffmpeg -i $_.FullName -c:a libvorbis -q:a 4 ($_.BaseName + ".oga") }'. The exact FFmpeg command shown on this page is the same command used in these loops.

Technical Notes

WMV files use Microsoft's ASF (Advanced Systems Format) container and typically encode audio with the wmav2 codec (Windows Media Audio v2), a proprietary lossy codec that is not natively supported on Linux or macOS without additional codec packs. OGA is the audio-only variant of the Ogg container (distinguished from .ogg by the .oga extension per RFC 5334) and is designed specifically to hold audio streams — in this case, Vorbis encoded by libvorbis. Since WMV does not support transparency, subtitles, or chapters, and OGA does not support video or subtitles, this conversion is straightforwardly an audio-only transcode with no ancillary stream concerns. One known limitation is that WMV files with DRM (Digital Rights Management) protection cannot be decoded by FFmpeg and will fail to convert — DRM-protected WMV files must be handled through licensed playback software. The output OGA file will support Ogg chapter markers if you add them manually post-conversion, as OGA does support chapters. File size will generally decrease significantly compared to the original WMV because the video stream (often the largest component) is dropped entirely, and Vorbis at -q:a 4 is an efficient codec for audio-only storage.

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