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Introduction to HEVC

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Introduction to HEVC / H265

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Introduction to HEVC

  1. 1. Copyright © 2013 LOGTEL HEVC/H.265 Overview
  2. 2. Copyright © 2013 LOGTEL Overview  Industry needs  Large resolution support (4K, 8K)  Friendliness for multi-core platforms (by built-in parallelization)  Better Coding Efficiency  High-contrast TV (10-bits per pixel and higher)  Glassless (auto stereoscopic) 3D TV.  Screen Content and Overlay graphics Coding (Games, synthetic video)
  3. 3. Copyright © 2013 LOGTEL  Improve H.264/AVC coding efficiency by 50% or better  Enhance parallelism  Effective Coding for 10 bps and higher  Enable graphics coding tools – not done yet  Adapt for Auto-Stereoscopic TV (glassless TV) – not done yet? HEVC Goals
  4. 4. Copyright © 2013 LOGTEL HEVC History  HEVC is a direct successor of H.264/AVC  HEVC is a competitor of VP9  Start: 2010  MPEG & ITU-T VCEG established a Joint Collaborative Team to specify HEVC  Finish: January 2013 – HEVC is approved as a standard  ISO/IEC 23008-2 High Efficiency Video Coding Standard  ITU-T Rec. H.265 as a standard.
  5. 5. Copyright © 2013 LOGTEL HEVC - Features 5
  6. 6. Copyright © 2013 LOGTEL New Features SAO – Sample Adaptive offset Transform skip In-Built Parallelism:  Tiles - Frame Division to Separate Encodeable regions .  WPP - Parallel Coding of Rows
  7. 7. Copyright © 2013 LOGTEL Simplification  CABAC simplification  De-blocking  Interlace modes
  8. 8. Copyright © 2013 LOGTEL  CABAC  reduce context coded bins  group bypass coded bins  group bins with the same context, reduce context selection dependencies, …  Deblocking:  Simpler logic for enabling/disabling filtering across edge  Filtering on 8x8 grid  Restricted interlace support  No MBAFF  No PAFF Simplifications (details(
  9. 9. Copyright © 2013 LOGTEL Enhancements  Larger Blocks  Enhanced motion prediction  Enhanced Intra prediction  Enhanced Motion Compensation
  10. 10. Copyright © 2013 LOGTEL HEVC Enhancements  Larger coding units up to 64x64  Enhanced range of prediction unit (PU)  from 4x4 to 64x64  Enhanced range of transform unit (TU)  from 4x4 to 32x32  New Asymmetric prediction partitions  32x8, 16x8, …  Enhanced motion vector prediction: competitive prediction instead of the H264 median prediction
  11. 11. Copyright © 2013 LOGTEL HEVC Enhancements  Enhanced direct /skip mode  Additional candidates (up to 5)  Enhanced Intra Prediction:  35 modes instead of 9 in AVC/H.264  Enhanced motion compensation:  8-tap filter 11
  12. 12. Copyright © 2013 LOGTEL HEVC Status (Aug. 2014(  HEVC Main (Main10) Profile finalized, performance is already meeting or exceeding its goals  Working on version 2 (Rext):  Add YUV 4:2:2, 4:4:4  Monochrome 12, 16 bits per pixel for medical imaging  Working on scalability  SHVC  3D (MVC+depth, Multiview).  JPEG and MPEG are developing a file format for the coding of still images based on HEVC (HEVC Webp)
  13. 13. Copyright © 2013 LOGTEL HEVC Status (cont.) * Taken from http://ngcodec.com/news/2014/1/12/current-status-of-hevch265-hardware-support
  14. 14. Copyright © 2013 LOGTEL HEVC Application  Streaming  Video conferencing  HD Video Distribution to Mobile  Wireless HDMI, Wi-Fi Display, WFD  Broadcast 4K, 8K
  15. 15. Copyright © 2013 LOGTEL HEVC vs. H.264/AVC  According to JCTVC-I0407 (KDDI), HEVC outperforms H.264/AVC in PSNR metric  21% on all-intra streams  36% on random access streams  43% on low-delay streams  MOS tests conducted by InterDigital reveal bitrate saving above 50% for wide bitrate range (from 380kbps to 1270 kbps).  Research of NTT DOCOMO shows HEVC (version HM5.0 HE) at half the bitrate looks comparable or better than High Profile of H.264/AVC.
  16. 16. Copyright © 2013 LOGTEL Compression Bit-rate Trend
  17. 17. Copyright © 2013 LOGTEL AVC/H.264 vs. HEVC – Case Examples
  18. 18. Copyright © 2013 LOGTEL AVC/H.264 vs. HEVC – Case Examples
  19. 19. Copyright © 2013 LOGTEL AVC/H.264 vs. HEVC – Case Examples
  20. 20. Copyright © 2013 LOGTEL HEVC/H.265 Adaptation Blu-Ray Disc Association (BDA) adopted HEVC/H.265: HEVC/H.265 chosen as main codec for 4K Blu-Ray (optic disks, 50Gb):  Resolution 3,820×2,160  10 bits per pixel  Bit-rate 50-60Mbps and higher MPEG DASH adopted HEVC/H.265
  21. 21. Copyright © 2013 LOGTEL HEVC/H.265 Adaptation  ffmpeg  DivX Player: version 10.2.2  MediaInfo: version 0.7.70 supports x265 library
  22. 22. Copyright © 2013 LOGTEL HEVC Open-source Codecs Vendor Product Website License JCT-VC HM https://hevc.hhi.fraunhofer.de/HM-doc/ BSD MultiCoreWare x265 http://x265.org/ GPL 2 Vantrix f265 http://f265.org/ BSD Tampere University of Technology Kvazaar https://github.com/ultravideo/kvazaar GPL 2 * All codecs are compiled in linux
  23. 23. Copyright © 2013 LOGTEL • Official JCT-VC site http://phenix.it-sudparis.eu/jct/ • Recent text draft (after Geneva’s JCT-VC meeting, Jan. 2013): http://phenix.int-evry.fr/jct/doc_end_user/current_document.php?id=7243 • JCT-VC forum For subscribing go to the link: http://mailman.rwth-aachen.de/mailman/options/jct-vc/ • Reference Model (HM) and Draft Bug Tracker: https://hevc.hhi.fraunhofer.de/trac/hevc This link contains a list of declared bugs in both HM and the spec. • HEVC Documents Repository: http://wftp3.itu.int/av-arch/jctvc-site/ This link contains all proposal and notes from the very first JCT-VC meeting. • Testing HEVC streams: ftp://ftp.kw.bbc.co.uk/hevc/ • HEVC Reference SW (HM) https://hevc.hhi.fraunhofer.de/svn/svn_HEVCSoftware/tags/ Useful Links

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