WMV to OPUS Converter

How to Convert WMV to Opus Online

1. Upload Your WMV File: Drag and drop your .wmv clips, or click "+ Add Files" to pick from your computer. Batch uploads are supported and each file keeps its own settings panel.
2. Pick Quality Preset (or Bitrate): The default preset is "Highest" (around 192-256 kbit/s VBR). Drop to "Medium" (96 kbit/s) for transparent music, "Low" (64 kbit/s) for podcasts, or "Lowest" (~32 kbit/s) for voice memos. For exact control, switch to Constant Bitrate or Variable Bitrate and type any value between Opus's spec-allowed 6 and 510 kbit/s, or use Custom Bitrate for a precise kbps target.
3. Adjust Audio Channel, Sample Rate, and Trim (Optional): Keep Audio Channel at "Original" or force Mono to halve the file. Sample Rate defaults to "Original"; Opus internally resamples to 48 kHz but you can lock 8/12/16/24/48 kHz. Use Trim to enter a start time and duration in HH:MM:SS.ms to extract a clip rather than the whole timeline.
4. Convert and Download: Click "Convert." Files are processed on our servers over HTTPS, the source .wmv is deleted after conversion, and the .opus (Ogg-wrapped) downloads to your device. No watermark, no sign-up.

Why Convert WMV to Opus?

WMV is Microsoft's 1999-era video container, standardised as SMPTE VC-1 in April 2006 and almost always paired with WMA audio inside an ASF wrapper. Opus, defined by IETF RFC 6716 on 10 September 2012, is a royalty-free codec jointly developed by Xiph.Org (CELT) and Skype/Microsoft (SILK) that covers 6-510 kbit/s and 8-48 kHz with a default algorithmic delay of 26.5 ms. Extracting the audio track to Opus typically cuts file size by 80-95% versus the original WMV while delivering audio that listening tests rank above MP3, AAC-LC, and Vorbis at the same bitrate.

• Archive lecture recordings and webinars — Older Camtasia, Articulate, and Windows Movie Maker exports landed as WMV. A 1-hour lecture at WMA 128 kbit/s shrinks from ~500 MB of WMV to ~30 MB of Opus at 64 kbit/s with no perceptible speech loss.
• Podcast and audiobook prep — Opus at 24-48 kbit/s outperforms MP3 at 96 kbit/s for voice, so a screencast soundtrack converts cleanly for podcast hosting on platforms like Castopod or PeerTube that accept Opus natively.
• Discord, WhatsApp, and Telegram voice notes — Discord and WhatsApp already use Opus internally. Converting a WMV interview to Opus 32 kbit/s mono produces a file most messaging apps accept without re-encoding, preserving quality.
• WebRTC and Jitsi recordings — Opus is a mandatory-to-implement audio codec for WebRTC per IETF RFC 7874, so re-conferencing or re-streaming archived WMV calls into Opus avoids transcoding on Jitsi, BigBlueButton, and LiveKit servers.
• Modern browser and OS playback — .opus plays natively in Firefox, Chrome, Edge, and Safari 17+ on macOS Sonoma and iOS 17+, while raw .wmv requires a third-party decoder on Mac, Linux, Android, and iOS.
• Free up space on Android and Linux devices — These platforms have no native WMV/WMA decoder. Converting to Opus removes the need for VLC or MX Player just to listen, and aligns with Android's default voice-memo codec since Android 10.

WMV vs Opus — Format Comparison

Opus Bitrate Quick Guide

For deeper bitrate decisions, see our compress Opus tool. To go the other way, try convert MP3 to Opus or convert WAV to Opus. If you specifically need MP3 instead, use convert WMV to MP3.

Frequently Asked Questions

Why does my Opus file have a .ogg extension instead of .opus?

Opus is a codec, not a container. The reference encoder wraps Opus packets in an Ogg container, and historically both .ogg and .opus were used. Since 2013 the Xiph.Org guidance is that audio-only Opus streams should use .opus, and that's what our converter outputs. If a player won't open .opus, renaming to .ogg works in older builds of VLC and foobar2000. Modern players (Firefox, Chrome, Edge, Safari 17+, VLC 3.0+) accept both.

Will the audio quality be worse than the original WMA inside the WMV?

For most source material the answer is no — Opus is the most efficient lossy codec currently standardised, so an Opus file at half the WMA bitrate generally sounds equivalent or better. Listening tests on opus-codec.org show Opus exceeding HE-AAC and Vorbis at 64 kbit/s, and LC-AAC plus MP3 at 96 kbit/s. The one caveat: any lossy-to-lossy transcode adds a small amount of generational loss. If you have the original uncompressed source, encode straight to Opus instead.

Can I extract just a clip instead of the whole video's audio?

Yes. Open Advanced Options, scroll to Trim, switch the input dropdown to HH:MM:SS.ms, then enter a start time and duration. To grab seconds 30-90 of a webinar, set start to 00:00:30.000 and duration to 00:01:00.000. Trim runs before encoding so the output is exactly the segment you specified, not the full track silenced outside the range.

What bitrate should I pick for a one-hour podcast interview?

For mono spoken-word with no music bed, 32 kbit/s Opus is the sweet spot — under 15 MB per hour and intelligibility is indistinguishable from 128 kbit/s MP3. If you have a music intro and outro or two stereo guests, bump to 48-64 kbit/s stereo. Anything above 80 kbit/s for voice is wasted bandwidth — Opus was specifically designed around speech at 6-40 kbit/s using its SILK layer.

Does Apple Podcasts, Spotify, or YouTube accept Opus uploads?

As of 2026: Apple Podcasts requires MP3 or AAC in an MP4 container (no Opus). Spotify for Podcasters accepts MP3, M4A, and WAV but not Opus directly. YouTube ingests Opus in WebM and serves it to viewers, so you can upload a .webm containing Opus. For Apple/Spotify workflows, convert WMV to MP3 instead, or convert your Opus master to MP3 as a final step.

Why is the converted file so much smaller than the original WMV?

You're discarding the video stream entirely — only the audio track is kept — and then re-encoding the audio with a much more efficient codec. A 500 MB WMV at 1080p with WMA 128 kbit/s contains roughly 60 MB of audio; that audio re-encoded to Opus 64 kbit/s lands around 28 MB. The remaining 472 MB was the video the file no longer carries.

Can I batch convert a folder of old Windows Movie Maker exports?

Yes. Drag the entire selection onto the upload area; each WMV gets its own settings card so you can keep one global preset or tune individual files (handy if some are voice and some are music). The "Apply to all" toggle on the preset dropdown copies your top file's options to the rest.

Where is my WMV processed, and is it kept afterward?

Files are uploaded over HTTPS, processed server-side with FFmpeg on xconvert's infrastructure, and the source plus output are deleted automatically after a few hours. We do not store or analyse the audio content.

Why does my output sound mono even though the WMV had stereo audio?

Check the Audio Channel dropdown — if it's set to "Mono" the converter downmixes. Switching to "Original" preserves whatever the WMA source had (most webcam recordings are mono, most music videos are stereo). Some old Windows Movie Maker projects authored their audio as mono regardless of source, so verify by playing the WMV in VLC and checking the Audio menu first.