Speex Audio Codec
Speex is Opus's predecessor from Xiph.Org. Understanding Speex/Ogg framing helps maintain legacy VoIP and streaming integrations.
What It Defines
Open-source speech codec (2–44 kbps, narrowband/wideband/ultra-wideband modes) designed for VoIP. Native `.spx` container or Ogg encapsulation. Largely superseded by Opus but still found in legacy Asterisk/Icecast streams.
Canonical (Normative)
Convenient (Practical)
Publishes web platform specs including CSS, accessibility, security policies, Service Workers, Web App Manifest, and many browser APIs. Also maintains some versioned HTML/DOM specs.
Related Specs
Opus-in-Ogg is an alternative to WebM/MP4 for VoIP recordings and Icecast streams. Page/chunk structure is a classic telephony streaming envelope pattern.
Opus is the codec for real-time audio on the internet. WebRTC mandates it; Discord, Zoom, and most VoIP apps use it. Understanding bitrate, FEC, and frame sizing directly impacts audio quality and bandwidth.
Vorbis shares Ogg framing with Opus — understanding Vorbis header packets clarifies how Ogg-encapsulated telephony codecs are structured.