H.263 is a video codec designed by the ITU-T as a low-bitrate encoding solution for videoconferencing. It was first designed to be utilized in H.324 based systems (PSTN and other circuit-switched network videoconferencing and videotelephony), but has since found use in H.323 (RTP/IP-based videoconferencing), H.320 (ISDN-based videoconferencing), RTSP (streaming media) and SIP (Internet conferencing) solutions as well.

H.263 was developed as an evolutionary improvement based on experience from H.261, the previous ITU-T standard for video compression, and the MPEG-1 and MPEG-2 standards. Its first version was completed in 1995 and provided a suitable replacement for H.261 at all bitrates. It was further enhanced in projects known as H.263v2 (a.k.a. H.263+ or H.263 1998) and H.263v3 (a.k.a. H.263++ or H.263 2000).

The next enhanced codec developed by the ITU-T (in partnership with MPEG) after H.263 is the H.264 standard, also known as AVC and MPEG-4 part 10. As H.264 provides a significant improvement in capability beyond H.263, the H.263 standard is now considered primarily a legacy design (although this is a recent development). Most new videoconferencing products now include H.264 as well as H.263 and H.261 capabilities.

For more information on H.263, see the following sources:

External link

• H.263 Video Coding Comparison
• IETF AVT Working Group - Group that reviews codec packetizations for RTP
  • RTP Payload Format for H.263 Video Streams (RFC 2190)
  • RTP Payload Format for the 1998 Version of ITU-T Rec. H.263 Video (H.263+) (RFC 2429)
• Find H.263 specification on ITU website
• Intel's H.263 codec installer for Windows
• I263 video codec
• H.263 Specifications
• H.263 implementation in vic (source code available)
• SourceForge Project to create H.263 codec
• Video Demystified - Book which includes info about H.263