Codecs

A codec is a function that takes uncompressed voice or video and compresses that data to make it more efficient to store or transmit. This page lists a few of the popular voice/video codecs used in VoIP systems.

Video Codecs

• H.264
  • Advanced video coding for generic audiovisual services specification
  • Overview
  • Overview of the H.264/AVC Video Coding Standard
  • The Emerging H.264/AVC Standard
  • Video Compression—From Concepts to the H.264/AVC Standard
  • The H.264/MPEG4 Advanced Video Coding Standard and its Applications
  • The Scalable Video Coding Extension of the H.264/AVC Standard
  • Open Source Project
• H.265
  • High efficiency video coding specification
  • Overview
• H.266
  • Versatile video coding specification
  • Overview
• AV1
  • AV1 Bitstream & Decoding Process Specification
  • Overview
  • Technical Overview

Audio Codecs

• ITU-T's G-series Codecs
  • G.711
  • G.711.0
  • G.723.1
  • G.726
  • G.729
  • G.729.1
• iLBC
  • iLBC Information Site
  • Open Source Project
• Opus
  • Opus website
  • Overview
  • RFC 6716 - Definition of the Opus Audio Codec
  • RFC 8251 - Updates to the Opus Audio Codec