HEVC Format Range Extension (RExt)


After finalization of the HEVC base specification, JCT-VC continued to work on extensions.

The Format Range Extension (RExt) provides tools to support 4:0:0, 4:2:2 and 4:4:4 color spaces and additional bit depths.

RExt is included in the second version of HEVC, which has been finalized in October 2014.


Reference software

The reference software for RExt has been maintained in a separate branch of the main HEVC software repository.

With HM 16.0 the RExt branch was merged into the mainline HM software, so that there is no separate RExt version maintained anymore.

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.

HEVC reference software documentation

Bug reporting

Specification and software bugs related to RExt can be reported using the main HEVC bug tracker:

Overview Papers

JCT-VC chairs

  • Jens-Rainer Ohm
  • Gary J. Sullivan

RExt specification editors

  • Joel Sole
  • David Flynn
  • Matteo Naccari
  • Chris Rosewarne
  • Karl Sharman,
  • Gary J. Sullivan
  • Teruhiko Suzuki

HM software coordinators

  • Karsten Suehring
  • Karl Sharman

RExt software coordinators

  • Karl Sharman
  • David Flynn