What is Opus audio? Complete Guide
Opus is a free, open-source audio codec maintained by the IETF. It's the default high-quality audio format that YouTube serves to modern browsers and Android devices. AudJet delivers Opus at 160kbps directly from YouTube — no re-encoding, no quality loss.
Technical specs
- Codec: Opus (RFC 6716)
- Container on YouTube: WebM
- Bitrate (AudJet): 160kbps
- Sample rate: 48 kHz
- Latency: 5–22.5 ms
- License: Royalty-free, open standard
Pros
- Best audio quality per bit of any widely-deployed lossy codec.
- Free to use anywhere, no patent licensing.
- Native support in Firefox, Chrome, Edge, modern Safari, Android, recent iOS.
Cons
- Older devices (pre-2018 Apple, old Android, vintage Bluetooth speakers) may not play
.opusfiles. - Not supported by some legacy DAWs and CD-burning workflows.
Opus vs AAC vs MP3 at typical bitrates
| Format | Bitrate | Quality | Compatibility |
|---|---|---|---|
| Opus | 160kbps | Best | Modern devices, browsers |
| AAC | 128kbps | Good | Apple ecosystem, cars |
| MP3 | 128kbps | OK | Universal — every device since 1995 |
When to use Opus
Pick Opus if your target playback is a modern phone, computer, or browser. For maximum compatibility (cars, old Bluetooth, embedded devices), AAC or MP3 is the safer bet.
FAQ
- Does Opus work on iPhone?
- Native Opus support landed in iOS 17. Older iPhones may need a third-party player like VLC.
- Is Opus better than MP3?
- Yes — significantly. Opus 160kbps usually sounds better than MP3 192kbps in blind listening tests.
- Can I burn Opus files to a CD?
- Most CD-burning tools want WAV or MP3. Convert Opus to MP3 first or use software that handles transcoding for you.
- Will Opus play in my car?
- Modern Android Auto and most 2020+ cars support it. Older systems may need MP3 or AAC instead.
- Why does YouTube use Opus?
- Better quality per bit means lower bandwidth, faster page loads, and lower CDN costs at YouTube's scale.