JVET-O0282 CE8-releated: Bug Fix in CE8-2.1 [C.-H. Hung, Y.-H. Chao, W.-J. Chien, V. Seregin, M. Karczewicz (Qualcomm)]

This document reports a bug fix in CE test 8-2.1 on palette mode tested on top of VTM-5.0. The original CE8-2.1. will crash for some 4:4:4 test sequences under low QP conditions. The CE results after bug fixing show that:4:2:0 test sequences,

1. Under CTC conditions, the BD-rate and PSNR after bug fixing are the same as original ones.
2. Under low QP conditions, including DualITree turned on and off, the BD-rate and PSNR after bug fixing are the same as original ones.

For 4:4:4 test sequences,

1. Under CTC conditions, the BD-rate and PSNR after bug fixing are the same as original ones.
2. Under low QP conditions, including DualITree turned on and off, the BD-rate and PSNR after bug fixing are slightly different from original ones.

The encoder crashes at low QP for some 4:4:4 sequences. This occurs since palette is used more frequently here, and there is a problem with a temporary buffer.

Decision (SW/BF): Adopt JVET-O0282. Palette software to be updated.