VCEG HM KTA software


VCEG (an abbreviation for Visual Coding Experts Group or Video Coding Experts Group) is the ITU-T group responsible for developing standards for compression coding of images and video. It is formally structured as Question 6 of ITU-T Study Group 16.

Its history spans from the development of the first standards for digital video coding (ITU-T H.120 and H.261) through the recent development of HEVC (ITU-T H.265/MPEG-H Part 2) and its extensions. Its informal nickname, VCEG, originated in 1998. Several of its projects have been joint developments with ISO/IEC JTC 1/SC 29/WG 11 (MPEG), and it is also responsible for still-picture coding in partnership with ISO/IEC JTC 1/SC 29/WG 1 (JPEG).

VCEG HM KTA software

At several points in its history, dating back at least to 1996, VCEG has conducted coordinated studies of what it calls "Key Technology Areas" (KTAs) for potential future standardization. Its prior KTA efforts have been instrumental in the development of extensions of ITU-T H.263 and the creation of the AVC (ITU-T H.264/MPEG-4 Part 10) and HEVC (ITU-T H.265/MPEG-H Part 2) standards.

An HM KTA software effort was started to investigate possible coding coding improvements beyond HEVC. With the foundation of the Joint Video Exploration Team on Future Video Coding (JVET), the KTA sofware was used as starting point for a Joint Exploration Model (JEM) and is now jointly maintained in JVET. Old versions of KTA are still available in the JEM software repository.

The HM KTA software was based on the HEVC Model (HM) software that has been jointly developed as reference (example) software for the HEVC standard.

The software is maintained in a Subversion repository. Please use a Subversion client to access the repository links directly or use the source browser for web browser access.



  • Gary J. Sullivan

Associate Rapporteurs

  • Thomas Wiegand
  • Jill Boyce

HM-KTA software coordinators

  • Xiang Li
  • Karsten Suehring