Near-Lossless Discord OPUS API

⚠️ Both you and the recipient must use the same configuration for best compatibility.

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Audio Quality Comparison

Opus HD 2.0 Mbps / Multichannel

Opus Legacy 510 kbps / Stereo

Stock 96 kbps / Mono

Fixed bitrates delivered with: CPU ≥ 3.0 GHz quad-core with AVX2 support,
and stable network (≥5 Mbps upload).

🎉 What's New?

Scalable HD Bitrate Layering
Base layer (510 kbps) for legacy clients, enhancement layer (1.49 Mbps) for Opus 1.6+ clients.
Explicit HD Layer Metadata
Diagnostic reporting now includes a clear split between base and enhancement bitrates.
Repacketiser & Packet Analysis
On-the-fly packet restructuring and deep diagnostics enabled for improved network resilience.
Extended CTL Interface
Full control over all encoder and decoder parameters via pre-defined constants.
Surround Processing Stack
End-to-end 24-bit multichannel encoding with integrated DRED, bandwidth extension (BWE), and NoLACE speech enhancement.

Disclaimer: This release is a rollback due to critical calling issues in recent patch, audio dropouts where participants could not hear each other or receive media streams reliably. The current version restores a known-stable configuration to ensure functional real-time communication.

Download Files

Direct Download Video Tutorial

For full update history and support, join our Discord server.

📊 Feature Comparison

Feature	Opus HD	Opus Legacy	Stock
Bitrate	2.0 Mbps	510 kbps	8 - 96 kbps
Sample Rate	96 kHz	48 kHz	48 kHz
Channels	24-bit / Multichannel / Near-Lossless	16-bit / Stereo / HD	Mono / Compressed
Frame Size	120 ms	20–60 ms	10–15 ms
24-bit I/O Support	✅ Yes	❌ No	❌ No
Backward Compatible Decoding	✅ Yes [2Mb/s]	✅ Yes [510kbps]	✅ Yes [510kbps]

Legacy Index.js

Important Note

This is NOT a Discord bot. It's a high-fidelity audio engine override for Opus 1.6. Maximum quality (2 Mb/s) works only in Group and Direct Calls , not server voice channels.

🔧 Required Client Configuration

Audio Subsystem : Switch to [Next Gen]
(User Settings > Voice & Video)

Disable All Preprocessing :

Turn OFF Krisp Noise Suppression
Turn OFF Echo Cancellation
Disable Automatic Gain Control (AGC)
Set Input Sensitivity to -100dB

💡 These filters degrade HD audio. Disabling ensures a pristine signal path.

📌 Note: Even with perfect settings, other users will only hear HD audio if they also have this mod installed. Otherwise, they’ll receive a backward-compatible 48 kHz / 510 kbps stream, still excellent, but not full HD.

Acknowledgements

Huge thanks to UNP Beats UK for fearless experimentation with audio codecs.

As an acoustic designer and music producer, I live at the intersection of science and sound. This project exists because I believe everyone deserves to hear music the way it was meant to be heard: pure, expansive, and alive . ❣

ML-Based BWE