JVET-R0002 JVET AHG report: Draft text and test model algorithm description editing (AHG2) [B. Bross, J. Chen, J. Boyce, S. Kim, S. Liu, Y.-K. Wang, Y. Ye]
This document reports the work of the JVET ad hoc group on draft text and test model algorithm description editing (AHG2) between the 17th meeting in Brussels, BE, (7–17 January 2020) and the 18th meeting by teleconference, (15–24 April 2020).
A joint ad hoc group meeting of AHGs 2, 3, 11, 14, 15 and 16 was held by teleconference on April 9 and April 14, involving 8 sessions of two hours each. The report from the joint AHG meeting sessions can be found in JVET-R0340.
At the 17th JVET meeting, it was decided to include additional coding features as well as simplify, clean up and fix the existing features for intra picture-prediction, inter-picture prediction, transform, CABAC engine and in-loop filter in the eighth draft of Versatile Video Coding (VVC D8) and the VVC Test Model 8 (VTM8) encoding.
The normative decoding process for Versatile Video Coding is specified in the VVC draft 8 text specification document. The VVC Test Model 8 (VTM 8) Algorithm and Encoder Description document provides an algorithm description as well as an encoder-side description of the VVC Test Model 8, which serves as a tutorial for the algorithm and encoding model implemented in the VTM8.x software.
An issue tracker (https://jvet.hhi.fraunhofer.de/trac/vvc) was used to facilitate the reporting of errata with the VVC documents.
For JVET-Q2001, the VVC text specification (Draft 8), fourteen versions of JVET-Q2001 were published by the editing AHG between the 17th meeting in Brussels, BE, (7–17 January 2020) and the 18th meeting by teleconference, (15–24 April 2020). JVET-Q2001 had been established based on JVET-P2001. Specific changes were listed in the report.
For JVET-Q2002, the VVC Test Model 8 (VTM 8) Algorithm and Encoder Description, three versions of JVET-Q2002 were published by the editing AHG between the 17th meeting in Brussels, BE, (7–17 January 2020) and the 18th meeting by teleconference, (15–24 April 2020). JVET-Q2002 had been established based on JVET-P2002. It provides the algorithm description for the majority of coding tools in VVC. Specific changes were listed in the report.
The AHG recommended to:
- Approve the edited JVET-Q2001 and JVET-Q2002 documents as JVET outputs,
- Continue to edit the VVC draft and Test Model documents to ensure that all agreed elements of VVC are fully described,
- 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 draft and the algorithm and encoder description,
- Continue to improve the editorial consistency of VVC WD and Test Model documents,
- Ensure that, when considering the addition of new feature to VVC, properly drafted text for addition to the VVC Test Model and/or the VVC Working Draft is made available in a timely manner,
- Review the remaining contributions of the joint AHG meeting (JVET-R0340) and act on them, on the revisits and on the recommendations.