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Versatile Video Coding (VVC) Versatile Video Coding (VVC) on the final stretch Benjamin Bross Fraunhofer Heinrich Hertz Institute, Berlin ITU Workshop on “The future of media” © Geneva, Switzerland, 8 October 2019 Versatile Video Coding (VVC) Joint ITU-T (VCEG) and ISO/IEC (MPEG) project Coding Efficiency Versatility 50% over H.265/HEVC Screen content HD / UHD / 8K resolutions Adaptive resolution change 10bit / HDR Independent sub-pictures 2 VVC – Coding Efficiency History of Video Coding Standards H.261 JPEG H.265 / H.264 / H.262 / (1991) (1990) PSNR MPEG-HEVC MPEG-4 AVC MPEG-2 (dB) (2013) (2003) (1995) 40 38 Bit-rate Reduction: 50% 35 36 34 32 30 28 0 100 200 300 bit rate (kbit/s) 3 VVC – Coding Efficiency History of Video Coding Standards H.261 JPEG H.265 / H.264 / H.262 / (1991) (1990) PSNR MPEG-HEVC MPEG-4 AVC MPEG-2 (dB) (2013) (2003) (1995) 40 38 36 Do we need more efficient video coding? 34 32 30 28 0 100 200 300 bit rate (kbit/s) 4 VVC – Coding Efficiency Jevons Paradox "The efficiency with which a resource is used tends to increase (rather than decrease) the rate of consumption of that resource." 5 VVC – Coding Efficiency Target for the final VVC standard H.262 / H.261 JPEG H.??? / H.265 / H.264 / MPEG-2 (1991) (1990) PSNR MPEG-VVC MPEG-HEVC MPEG-4 AVC (dB) (2013) (2003) (1995) 40 38 36 35 Bit-rate Reduction Target: 50% 34 32 30 28 0 100 200 300 bit rate (kbit/s) 6 VVC – Timeline 2015 Oct. – Exploration Phase • Joint Video Exploration Team (JVET) of ITU-T VCEG and ISO/IEC MPEG established October ‘15 in Geneva • Joint Video Exploration Model (JEM) as software playground to explore new coding tools • 34% bitrate savings for JEM relative to HEVC provided evidence to start a new joint standardization activity with a… 2017 Oct. – Joint Call for Proposals (CfP) • Submit bitstreams and decoded video for proposed video coding technology • Compare submission with HEVC anchor for given sequences, bitrates and coding conditions 2018 Apr. – Development Phase • Subjective evaluation results of submitted CfP responses and HEVC anchor • Lean initial starting point of standard development 2020 Jul. – Final Standard 7 VVC – Call for Proposals Results • JVET received submissions from 32 organizations. • 40% or more bitrate savings in terms of PSNR over HEVC were shown. • All submissions were superior in terms of subjective quality than… • HEVC (in most test cases). • JEM (in a relevant number of test cases). 8 VVC – Call for Proposals Subjective testing result example Best performing HEVC anchor JEM (for this sequence) SunsetBeach (UHD, HLG) 10 9 8 7 6 10 Mbit/s 5 6 Mbit/s 4 3 3 Mbit/s 2 – 1.5 Mbit/s Mean Opinion Score (MOS) Score MeanOpinion 1 0 JVET-J0080: “Results of Subjective Testing of Responses to the Joint CfP on Video Compression th Technology with Capability beyond HEVC”, 10 JVET Meeting,9 San Diego, April 2018 VVC – Development Draft 1 and First Test Model (VTM-1.0) • Start off with a clean slate • Add quadtree plus multi-type tree block partitioning (QT+MTT) • Fundamental impact on all coding tools to be added • Most common partitioning scheme among all CfP submissions • VVC Test Model (VTM) as reference implementation of VVC specification draft • Test promising coding tools from CfP on that lean basis (efficiency / complexity aspects) • Agree on adding tested coding tools until sufficient bitrate reduction is achieved 10 VVC – Development Draft 6 and VTM-6.1 - New coding tools for coding efficiency • Flexible Block Partitioning with Multi-type Tree (MTT) • Bi-prediction with CU weights (BCW) • Separate Tree for Luma and Chroma (CST) • Decoder-side motion vector refinement (DMVR) • Dependent Quantization (DQ) • Symmetric motion vector difference (SMVD) • Joint coding of chrominance residuals (JCCR) • Sub-block transform (SBT) • ManyMultiple Transform incremental Set (MTS) improvements• Combined intra/inter prediction of(CIIP) • classicLow frequency nonhybrid-separable transform video (LFNST) coding• Multi-reference design line intra prediction (MRL) • Adaptive Loop Filter (ALF) • Intra block copy mode (IBC) • Affine Motion Compensation • Intra sub-partitioning (ISP) • Subblock-based Temporal Merging Candidates • Matrix based intra prediction (MIP) • Adaptive motion vector resolution (AMVR) • Cross-component Linear Model (CCLM) • Triangular partition mode (TPM) • Luma mapping with chroma scaling (LMCS) • Bi-directional optical flow (BDOF) • Transform Skip Residual Coding (TSRC) • Merge with MVD (MMVD) • Quantized residual11 DPCM … VVC – Coding Efficiency VVC reference software (VTM) vs. HEVC reference software (HM) Same ball park as -38 -37.7 11 -35.8 10 HEVC vs. AVC -33 -34.2 -31.8 9.7 9 -28 -27.5 8.9 8 Subjective gains -23 7.4 7 6 expected to be higher -18 5 5.2 (to be confirmed) -13 4 -10.6 3.6 3 Bitrate reduction [%] Bitrate reduction -8 2 BD-Rate YUV 2.2 Complexity / runtime increase 1.8 1.6 1 -3 1.3 1.3 1.5 Enc. Speed 0.8 0 Dec. Speed VTM-1.0 VTM-2.0 VTM-3.0 VTM-4.0 VTM-5.012 VTM-6.1 Versatile Video Coding (VVC) Joint ITU-T (VCEG) and ISO/IEC (MPEG) project Coding Efficiency Versatility 50% over H.265/HEVC Screen content HD / UHD / 8K resolutions Adaptive resolution change Done! 10bit / HDR Independent sub-pictures 13 VVC – Versatility Screen content coding (SCC) • Application: new emerging content • Gaming • Screen sharing / remote desktop Arena of Valor (1080p60) Slide Editing (720p30) • … • Problem: Video codecs typically optimized for natural video (different signal characteristic) • Solution: Special screen content coding tools HEVC v4 SCC extensions -> not in main profile! VVC supports SCC already in v1 14 VVC – Versatility Reference picture resampling (RPR) • Application: Adaptive streaming with resolution switching • Problem: Pictures with different resolutions cannot reference each other in inter-picture prediction -> reduces coding efficiency • Solution: Resample reference picture in case of different resolutions VVC supports reference picture resampling More efficient resampling filters currently under investigation RPR as enabler for spatial scalability in VVC v1 (exact design under investigation) 15 VVC – Versatility Independent sub-pictures degree ERP ERP degree Full 360 video • Application: Tiled streaming of 360-degree videos Preferred viewing direction 1 • Problem: Managing a decoder pixel budget dynamically post-encoding -> throwing 24K video (parts) at a 4K decoder • Solution: More efficient coding of independent sub-pictures (in-picture padding) Flexible block addressing for easier extraction and merging of sub-pictures HLS design to avoid slice header rewriting 16 Versatile Video Coding (VVC) Joint ITU-T (VCEG) and ISO/IEC (MPEG) project Coding Efficiency Versatility 50% over H.265/HEVC Screen content HD / UHD / 8K resolutions Adaptive resolution change Done! Almost Done! 10bit / HDR Independent sub-pictures 17 Versatile Video Coding (VVC) Summary • Coding Efficiency – VVC Test Model 6.1 over HEVC (HM) H.264 / AVC • 38% PSNR-based bitrate reduction for HD and UHD • 8.9x encoder and 1.6x decoder runtime H.265 / HEVC • Versatility – enabled by: • Screen content coding tools (gaming, screen sharing,…) • Reference picture resampling (adaptive streaming) H.??? / VVC • Potential spatial scalability using RPR filters • Independent sub-pictures (360 video, ROI) • Final Standard by July 2020 18 Thank you very much! Further Information: [email protected] jvet.hhi.fraunhofer.de 19.
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