Video Coding Experts Group

Video Coding Experts Group

Abbreviation	VCEG
Predecessor	Specialists Group on Coding for Visual Telephony
Formation	1984
Type	Standards organization
Purpose	Coding of video, images, audio, biomedical waveforms, and other signals
Region served	Worldwide
Rapporteur	Gary Sullivan
Associate Rapporteur	Thomas Wiegand
Associate Rapporteur	Yan Ye
Parent organization	ITU-T Study Group 21
Website	www.itu.int/en/ITU-T/studygroups/2022-2024/16/video/Pages/vceg.aspx

The Video Coding Experts Group or Visual Coding Experts Group (VCEG, also known as Question 6) is a working group of the ITU Telecommunication Standardization Sector (ITU-T) concerned with standards for compression coding of video, images, audio signals, biomedical waveforms, and other signals, and multimedia authentication technology. It is responsible for standardization of the "H.26x" line of video coding standards, the "T.8xx" line of image coding standards, and related technologies.

Administratively, VCEG is the informal name of Question 6 (Visual, audio and signal coding) of Working Party 3 (Media authenticity, processing and AI-enabled applications) of ITU-T Study Group 21 (Technologies for multimedia, content delivery and cable television). Its abbreviated title is ITU-T Q.6/SG21, or more simply, ITU-T Q6/21. SG21 was formed by a merger of the former Study Groups 9 and 16, effective in 2025, with VCEG retaining the same Question number 6 in the merged Study Group.

The goal of VCEG is to produce ITU-T Recommendations (international standards) for video coding and image coding methods appropriate for conversational (e.g. videoconferencing and video telephony) and non-conversational (e.g., streaming, broadcast, file download, media storage/playback, or digital cinema) audio/visual services. This mandate concerns the maintenance and extension of existing video coding Recommendations, and laying the ground for new Recommendations using advanced techniques to significantly improve the trade-offs between bit rate, quality, delay, and algorithm complexity. Video coding standards are desired with sufficient flexibility to accommodate a diverse number of transport types (Internet, LAN, Mobile, ISDN, GSTN, H.222.0, NGN, etc.).

In 2023, VCEG began working toward standardization of coding technology for biomedical signals and other waveform signals. Its first compression encoding standard in this area is planned to become Recommendation ITU-T T.261, with approval expected in 2026.

Question 6 is part of Study Group 21, which is responsible for standards relating to multimedia technologies, systems, applications, and services for current and future networks, including IP-based and cable-based networks. This encompasses multimedia terminals, systems (e.g., network signal processing equipment, multipoint conference units, gateways, gatekeepers, modems, and facsimile), protocols and signal processing (media coding).

"SG21 – Technologies for multimedia, content delivery and cable television". ITU. Retrieved 26 July 2026.

↑ "The History of Video File Formats Infographic". RealNetworks. 22 April 2012. Retrieved 5 August 2019.

↑ "H.271: Video back-channel messages for conveyance of status information and requests from a video receiver to a video sender". ITU. May 2026.

↑ "Joint Collaborative Team on Video Coding - JCT-VC". ITU. Retrieved 7 March 2010.

↑ Pfaff, Jonathan; Halford, Jonathan (20 October 2023). "Call for evidence on the coding of biomedical waveform data" (PDF). ITU. Retrieved 27 April 2024.

↑ Spangler, Todd (25 January 2013). "ITU OKs Next-Generation Video Codec Standard". Multichannel News. Archived from the original on 12 December 2013. Retrieved 25 January 2013.

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