JVET-AK0010 JVET AHG report: Encoding algorithm optimization (AHG10) [P. de Lagrange, A. Duenas, R. Sjöberg, A. Tourapis (AHG chairs)]
- Activity
The regular JVET e-mail reflector was used for discussions (jvet@lists.rwth-aachen.de).
Teleconferences were held on December 4th and December 19th, and a few related organizational e-mails were sent to the JVET reflector, as well as a few support requests and answers to reproduce the results from the previous meeting cycle that were used for multilayer viewing tests during the Kemer meeting.
- Related contributions
Two contributions were identified relating to AHG10 and summarized in the following sections.
General
JVET-AK0052 - AHG10: Teleconference on encoder optimization
This document summarizes discussions during teleconferences on encoder optimization.
The remaining work related to VVC multi-layer coding was discussed, including support for multi-view (suggested tests, test sequences, expected software tools improvements and if specific configurations and encoder optimizations for visual testing would be acceptable.
Common test conditions
JVET-AK0181 - AHG10: Suggested upgrade of CTC for random access for VTM
This contribution suggests upgrading the VTM settings for random access to better handle a larger span of bitrates:
- Enabling GOP-based RPR as it can be beneficial to encode at a lower resolution for lower bitrates
- Enabling DMVR encoder control to improve subjective quality in some situations also especially at lower bitrates
Minor BD-rate gains (around -0.3%) were reported using the CTC, but more gain (up to -1.6%) when testing higher QPs, and more gain at higher resolutions. Visual quality improvement was reported, especially at low bitrates.
- Recommendation
The AHG recommended that the related input contributions are reviewed, and to further continue the study of encoding algorithm optimizations in JVET.