High Efficiency Video Coding
High Efficiency Video Coding (HEVC), also known as H.265 and MPEG-H Part 2, is a video compression standard designed as part of the MPEG-H project as a successor to the widely used Advanced Video Coding (AVC, H.264, or MPEG-4 Part 10). In comparison to AVC, HEVC offers from 25% to 50% better data compression at the same level of video quality, or substantially improved video quality at the same bit rate. It supports resolutions up to 8192×4320, including 8K UHD, and unlike the primarily 8-bit AVC, HEVC's higher fidelity Main 10 profile has been incorporated into nearly all supporting hardware.
|High efficiency video coding|
|First published||7 June 2013|
22 August 2021
|Organization||ITU-T, ISO, IEC|
|Committee||SG16 (VCEG), MPEG|
|Base standards||H.261, H.262, H.263, H.264, MPEG-1|
|Related standards||H.266, MPEG-5|
While AVC uses the integer discrete cosine transform (DCT) with 4×4 and 8×8 block sizes, HEVC uses integer DCT and DST transforms with varied block sizes between 4×4 and 32×32. The High Efficiency Image Format (HEIF) is based on HEVC. As of 2019[update], HEVC is used by 43% of video developers, and is the second most widely used video coding format after AVC.