JVET-W0002 JVET AHG report: Draft text and test model algorithm description editing (AHG2) [B. Bross, J. Chen, C. Rosewarne, F. Bossen, J. Boyce, S. Kim, S. Liu, J.-R. Ohm, G. J. Sullivan, A. Tourapis, Y.-K. Wang, Y. Ye]

Output documents produced

• JVET-V2005 VVC operation range extensions (Draft 3)
• This document contains the draft text for changes to the Versatile Video Coding (VVC) standard (ITU T H.266 | ISO/IEC 23090-3), for the support of the operation range extensions, the addition of Level 6.3 and the SEI manifest and SEI prefix indication SEI messages, including SEI payload type values and other interfaces for SEI messages added to the VSEI specification, as well as some technical corrections.
• Draft 3 incorporated items:
• Method of entropy coding for high bit depth in TSRC(JVET-V0054)
• Method of entropy coding for high bit depth in RRC (JVET-V0106)
• Method for high precision computation of transform scaling (JVET-V0047)
• Bug fix changes to the semantics of dui_dpb_output_du_delay_present_flag and dui_dpb_output_du_delay (JVET-V0111)
• Addition of the payloadType values etc. for the display orientation SEI message and the colour transform information SEI message (JVET-V0061, JVET-V0108)
• Fix for ticket #1479.
• JVET-V2006 Additional SEI messages for VSEI (Draft 3)
• This document contains the draft text for changes to the versatile supplemental enhancement information messages for coded video bitstreams (VSEI) standard (Rec. ITU-T H.274 | ISO/IEC 23002-7), to specify additional SEI messages, including the annotated regions SEI message, the alpha channel information SEI message, the depth representation information SEI message, the multiview acquisition information SEI message, the scalability dimension information SEI message, the extended dependent random access point (DRAP) indication SEI message, the display orientation SEI message, and the colour transform information SEI message. The draft text also includes text changes for some technical corrections and editorial improvements.
• Draft 3 incorporated items:
• Addition of the display orientation SEI message (JVET-V0061)
• Addition of the colour transform information SEI message (JVET-V0108)
• Changes on the scalability dimension information SEI message (JVET-V0063)
• Changes on the MAI, DRI, and ACI SEI messages and their interactions with the SDI SEI message (JVET-V0064)
• Changes on the DRAP and EDRAP indication SEI messages (JVET-V0065)
• JVET-V1004 Errata report items for VVC, HEVC, AVC, Video CICP, and CP usage TR
• This document contains a list of reported errata items for VVC, VSEI, HEVC, AVC, Video CICP, and the TR on usage of video signal type code points, for tracking purposes. Some of the items have been confirmed by the JVET and have been agreed to require fixing, while some other items have not yet been confirmed. This document also provides publication status backgrounds of these standards.
• Incorporated items at the JVET-V meeting:
• For VVC (the changes are included in an attachment to this document):
• Fix for ticket #1486
• For HEVC
• Removed the item on the absence of “persistence flag” for the annotated regions SEI message (this was agreed to be removed at the JVET-T meeting in October 2020, but the decision was overlooked)
• JVET-V1002 High Efficiency Video Coding (HEVC) Test Model 16 (HM 16) Encoder Description Update 15
• This document was prepared, incorporating:
• Addition of [AHG10] GOP-based temporal filter improvements (JVET-V0056)
• Addition of AHG 10: QP control for very smooth blocks (JVET-V0078)
• JVET-V2002 Algorithm description for Versatile Video Coding and Test Model 13 (VTM 13)
• The VVC Test Model 13 (VTM13) algorithm description and encoding method document was prepared, incorporating:
• Updated the description of motion compensated temporal pre-filtering (MCTF)
• Typo Fixes

No input contributions were noted as relevant to the work of this ad hoc group, as of the time of preparing this AHG report.

The AHG recommended to:

• Approve JVET-V1002, JVET-V1004, JVET-V2002, JVET-V2005, and JVET-V2006 documents as JVET outputs,
• Compare the VVC documents with the VVC software and resolve any discrepancies that may exist, in collaboration with the software AHG,
• Encourage the use of the issue tracker to report issues with the text of both the VVC specification text and the algorithm and encoder description,
• Continue to improve the editorial consistency of VVC text specification and Test Model documents,
• Ensure that, when considering changes to VVC, properly drafted text for addition to the VVC Test Model and/or the VVC specification text is made available in a timely manner,
• Review AHG2 related contributions (if any) and act on them if found to be necessary.