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Opus Codec

Overview

Opus Codec - Low-Latency Interactive Audio for VoIP, Streaming & Gaming

The Opus codec is a versatile, open, and royalty-free audio codec standardized by the IETF (RFC 6716) for interactive speech and audio transmission over the Internet. It combines the SILK and CELT (from Xiph.Org) technologies to support both voice and general-purpose audio, enabling high-quality communication even over lossy networks. Opus is suitable for real-time VoIP, video conferencing, in-game chat, and low-latency streaming.

Technical Specifications - Opus Codec

Parameter Specification
Full Name Opus Interactive Audio Codec
Standardized By IETF (RFC 6716)
Bandwidth Narrowband (NB), Wideband (WB), Super-Wideband (SWB), Fullband (FB)
Sampling Rate 8, 12, 16, 24, 48 kHz
Bit Rates Supported 6 to 510 kbps (constant and variable bitrate)
Frame Size 2.5 ms to 60 ms per frame
Codec Delay ~26.5 ms (typical)
Frame Structure Dynamically adaptive frames, forward error correction (FEC) supported
Algorithm Hybrid SILK (LPC) + CELT (MDCT)
Voice Activity Detection Optional, application-level VAD
Error Resilience Strong - FEC, packet loss concealment, jitter buffering
Complexity Moderate to High - scalable with configuration

Applications Areas of Opus Codec

VoIP and Video Conferencing

  • SIP clients, WebRTC

Online Streaming & Gaming

  • In-game chat, real-time multiplayer voice
  • Low-latency internet radio and podcasting

Embedded & Mobile Communication

  • IoT voice interfaces, smart assistants
  • Android/iOS voice apps

Multimedia Storage and Playback

  • Audio containers like .opus, .webm
  • Browsers, players (e.g., Firefox, VLC)

Performance Summary - Opus Codec

Bitrate (kbps) Bandwidth Speech Quality (MOS-LQO) Use Case
6-12 Narrowband ~3.4-3.8 Low bitrate VoIP, constrained networks
24-32 Wideband ~4.2-4.4 Standard voice/video calls
48-96 Super-Wideband ~4.6-4.8 Music, conferencing, hi-fi voice
128 - 510 Fullband ~5.0 Studio-quality music streaming

Supported Platforms

  • Operating Systems: Linux, Android, iOS, Embedded RTOS
  • Architectures: ARM Cortex-A/R/M, NEON/SIMD, x86/x64, MIPS DSP, Andes DSP, Verisilicon ZSP

Why Choose the Opus Codec?

Royalty-free and open-source under BSD license

Combines low latency, high quality, and broad bandwidth support

Ideal for real-time applications across diverse networks

Strong resilience to packet loss and jitter

Natively supported in WebRTC and modern browsers

References & Standards - NB-AMR Codec

  • IETF RFC 6716 -Definition of the Opus Codec
  • IETF RFC 7587 -RTP Payload Format for the Opus Codec
  • Xiph.Org Foundation -https://opus-codec.org
  • Mozilla Developer Docs -Opus support in browsers
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