HEVC
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| HEVC | |
|---|---|
| Name | HEVC |
| Developer | ITU-T, ISO/IEC |
| Release | 2013 |
| Previous | H.264/MPEG-4 AVC |
| Successor | Versatile Video Coding |
| Standard | ITU-T Recommendation H.265, ISO/IEC 23008-2 |
HEVC
High Efficiency Video Coding (HEVC) is a video compression standard standardized as ITU-T Recommendation H.265 and ISO/IEC 23008-2 designed to substantially improve coding efficiency relative to H.264/MPEG-4 AVC. It targets high-resolution formats including 4K and 8K and is used across broadcasting, streaming, and videoconferencing services operated by organizations such as Netflix, Amazon (company), Apple Inc., and YouTube. Major technology companies and standards bodies including Microsoft, Intel, Samsung Electronics, Qualcomm, and Nokia participated in development and ecosystem support.
Overview
HEVC is a block-based hybrid video coding standard developed to succeed H.264/MPEG-4 AVC by combining techniques from prior standards negotiated within committees like ITU-T Study Group 16, ISO/IEC JTC 1/SC 29/WG 11 (MPEG), and industry consortia including MPEG LA and HEVC Advance. The standard defines syntax, semantics, and decoding processes used by codec implementations from vendors such as x265 project, FFmpeg, Cisco Systems, and Google LLC. It enables bit rate reductions that facilitate distribution over networks run by providers like AT&T, Verizon, Comcast, and platforms like Hulu.
Technical Features
HEVC introduces larger coding tree units and advanced prediction modes influenced by research from institutions such as MPEG, Bell Labs, and universities like Stanford University and Massachusetts Institute of Technology. Key tools include improved intra prediction, inter prediction with motion compensation, variable-sized transform units, and sophisticated in-loop filters comparable to techniques evaluated by Fraunhofer Society, NTT, and Nokia Research Center. HEVC supports chroma formats and color spaces adopted in workflows at BBC, NHK, Deutsche Welle, and Eutelsat, and integrates entropy coding methods related to CABAC used in H.264/MPEG-4 AVC.
Profiles, Levels and Extensions
The standard specifies profiles and levels to match application scenarios for broadcasters like Eutelsat, DirecTV, Dish Network, and streaming platforms such as Netflix and Amazon Prime Video. Profiles include Main, Main 10, and Range Extensions used by manufacturers like Sony, LG Electronics, and Panasonic Corporation. Extensions and supplementary standards such as the Screen Content Coding extension and multiview/3D profiles relate to projects by 3GPP, DVB Project, and research initiatives at CEA-Leti and University of Surrey.
Implementation and Hardware Support
Software implementations include encoders and decoders developed by x265 project, FFmpeg, HandBrake, and broadcaster toolchains from Ericsson, Harmonic Inc., and Grass Valley. Hardware acceleration is provided by GPUs and SoCs from NVIDIA, AMD, Intel, ARM Limited, and mobile silicon vendors like Qualcomm and MediaTek, and is integrated into consumer electronics such as Samsung Galaxy, Apple TV, Roku, PlayStation 4 Pro, and Xbox One S. Content delivery networks operated by Akamai Technologies, Cloudflare, and Fastly support HEVC streaming profiles.
Licensing and Patent Pools
Patent licensing for HEVC involves multiple patent holders and licensing entities including MPEG LA, HEVC Advance, and Velos Media. Major patent holders include corporations such as Samsung Electronics, Qualcomm, Microsoft, Huawei, Sony, Panasonic Corporation, and Nokia. Licensing complexity affected adoption decisions by companies like Google LLC, Mozilla Foundation, and Netflix and spurred discussions in regulatory environments involving European Commission, United States Department of Justice, and standards policy groups like IEEE Standards Association.
Applications and Adoption
HEVC is used for ultra-high-definition broadcasting by networks such as NHK, BBC, and Sky Group; streaming services operated by Netflix, Amazon (company), and Apple Inc.; video conferencing platforms run by Zoom Video Communications, Microsoft Teams, and Cisco Systems; and professional video production tools from Adobe Systems, Avid Technology, and Blackmagic Design. Mobile video, over-the-top platforms including Hulu, and cable operators such as Comcast and Charter Communications employ HEVC for bandwidth-efficient delivery. The codec also underpins emerging use cases in virtual reality platforms developed by Oculus VR and immersive media research at Fraunhofer Heinrich Hertz Institute.
History and Development
Work leading to the standard began with collaborative efforts among experts from ITU-T, ISO/IEC, and companies such as Mitsubishi Electric, NEC Corporation, Toshiba Corporation, Hitachi, Panasonic Corporation, and Sharp Corporation. The standardization process involved contributions from academic groups at EPFL, University of California, Berkeley, and Tsinghua University and led to final approvals in 2013 with revisions and extensions subsequently ratified. Post-standard evolution influenced successor projects like Versatile Video Coding and ongoing research published in venues such as IEEE Transactions on Circuits and Systems for Video Technology, SMPTE, and conferences like ICASSP and SIGGRAPH.