Convert AVI to Opus Online Free
Drag & drop your .avi file here, or click to browse
Converts to Opus on secure servers · first daily conversion free · no signup
Your first conversion each day is free. A $2.99 one-time Day Pass unlocks 24 hours and ends by itself.
Extract the audio from your AVI video and encode it as Opus — the modern open codec with superior compression. Perfect for streaming, Discord bots, and bringing old AVI audio into modern workflows.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile extracts audio from your AVI video and encodes it as Opus using FFmpeg on our secure servers. Opus is a cutting-edge open codec that outperforms MP3 and AAC at low bitrates, ideal for streaming and Discord. Files are auto-deleted, free with no signup required.
AVI vs Opus: Format Comparison
Key differences between the two formats
| Feature | AVI | Opus |
|---|---|---|
| Type | Microsoft video container | Open audio codec in OGG container |
| Developer | Microsoft | Xiph.Org / IETF RFC 6716 |
| Audio codec | MP3, PCM, or AC-3 (dated codecs) | Opus — state-of-the-art open codec |
| File size | Moderate to large (video included) | Very small — best efficiency available |
| Quality at low bitrate | MP3 degrades poorly below 128 kbps | Excellent quality at 32–128 kbps |
| License | Proprietary Microsoft format | Open-source, royalty-free |
| Use case | Legacy desktop playback | WebRTC, Discord, streaming, web audio APIs |
When to Convert
Common scenarios where this conversion is useful
Modernize AVI audio for Discord bot playback
Discord uses Opus for all voice audio. Converting legacy AVI audio to Opus lets Discord bots play back old media content with native Opus support, avoiding costly real-time transcoding.
Create compact audio from large AVI files
Opus at 128 kbps produces roughly 1MB per minute at near-transparent quality. Converting old AVI files to Opus audio gives you tiny, high-quality audio files from large legacy video content.
Prepare AVI documentary audio for low-bandwidth streaming
Opus significantly outperforms MP3 at bitrates below 64 kbps. Extract audio from AVI documentaries or training videos to Opus for streaming on bandwidth-constrained connections.
Convert AVI audio for WebRTC-based applications
WebRTC uses Opus for audio. Converting pre-recorded AVI content to Opus allows you to inject it into WebRTC pipelines or browser-based communication tools without real-time codec conversion.
Archive AVI audio in a modern open format
Opus is a modern, royalty-free codec unlikely to become unsupported in the near future. Converting old AVI audio to Opus creates a compact archive that is both highly efficient and freely usable on all platforms.
Who Uses This Conversion
Tailored guidance for different workflows
Podcasters
- Pull the audio from a recorded AVI interview or webinar and publish it as a Opus episode
- Convert a AVI livestream recording to Opus so listeners can catch up on the go
Musicians & Producers
- Extract a performance take from a AVI video into Opus to edit in your DAW
- Rip reference audio from a AVI clip to Opus for sampling or transcription
Content Creators
- Convert a AVI recording to Opus to reuse the soundtrack as background audio or a voiceover
- Turn a AVI talk into a Opus audiogram or clip for social platforms
How to Convert AVI to Opus
-
1
Upload your AVI file
Drag and drop your .avi file onto the converter or click to browse and select it. The free tier accepts files up to 25MB; eligible paid browser access accepts up to 100MB.
-
2
Server-side Opus encoding
Your AVI is uploaded over HTTPS and FFmpeg extracts and decodes the audio track, encoding it as Opus in an OGG container. The video stream is discarded. Processing completes in seconds.
-
3
Download your Opus file
Click Download to save the .opus file. Both the original AVI and Opus output are automatically deleted from our servers after download.
Developers: convert via API →
Frequently Asked Questions
Opus is a far more modern codec than MP3. At equivalent file sizes, Opus delivers noticeably better audio quality. At low bitrates (under 64 kbps), the difference is dramatic — Opus sounds good where MP3 sounds terrible.
Yes. Both MP3 and Opus are lossy codecs. Re-encoding from MP3 to Opus adds a small additional generation of lossy compression. At high target Opus bitrates (128 kbps+), this difference is typically inaudible.
Opus audio files use the .opus extension. The audio is stored in an OGG container. Some systems may display the file as .ogg — both are the same.
Yes. Chrome, Firefox, Edge, and Opera support Opus natively via the HTML5 audio element. Safari added Opus support in version 16 (2022). For older Safari compatibility, AAC or MP3 fallbacks are needed.
Yes. Discord voice channels use Opus internally. Node.js discord.js with @discordjs/opus and Python discord.py with PyNaCl both support native Opus file playback in voice channels.
FFmpeg encodes Opus at a high variable bitrate by default, typically 128 kbps. At this bitrate, Opus is generally transparent — indistinguishable from lossless audio for most listeners.
Yes. ChangeThisFile is completely free. No signup, no limits, and no fees. Opus is also royalty-free for any use.
Opus is supported by Chrome, Firefox, Edge, Android 5+, VLC, mpv, and most modern open-source media players. Windows Media Player does not support Opus natively.
Very fast. Opus encoding is computationally efficient. A one-hour AVI file typically converts to Opus in under 30 seconds.
Yes. All uploads are HTTPS-encrypted and files are deleted from our servers immediately after you download the Opus file. We never store or access your content.
Related Conversions
Related Tools
Free tools to edit, optimize, and manage your files.
Need to convert programmatically?
Use the ChangeThisFile API to convert AVI to Opus in your app or script. Free tier included.
Ready to convert your file?
Convert AVI to Opus instantly — free, no signup required.
Start Converting