JVET-Y0128 Non-EE2: fixing issues for RPR enabling and non-CTC configuration in ECM [Z. Zhang, H. Huang, C.-C. Chen, V. Seregin, M. Karczewicz (Qualcomm), P. Bordes (InterDigital)]

This contribution proposes slice level enabling condition check for adaptive DMVR and BM AMVP-merge mode. When the enabling condition is not fulfilled, the flag of adaptive DMVR and/or BM AMVP-merge mode is implicitly determined to be 0. The proposed method solves software issues with non-CTC configuration (e.g., RPR enabling). This contribution also proposes fixes for LIC and TM to enable RPR in ECM-3.1.

The proposed methods were implemented on top of ECM3.1 with merge request 47 (MR47). The simulation is conducted with RPR enabled. The test results confirm the software works properly.

It is suggested that LIC is not used and LIC block-level flag is not sent when the ref pic has a different size from the current picture. This allows usage of RPR, avoiding a mismatch..

This is not an encoder-only change and does not affect CTC. It seems to be straightforward fix to allow enabling RPR.

Decision (BF): Adopt JVET-Y0128.