Video Coding Experts Group
working group
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.
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