JVET-AO0145 AHG6: Larger CTU size for Class B in ECM Common Test Conditions [G. Laroche, P. Onno, B. Galmiche (Canon)]

This contribution proposes to modify the current common test conditions for enhanced compression tool as defined in JVET-AI2017. The modification is related to Class B of Random-Access configuration. Two aspects are proposed:

• The CTU size is set equal to 256 instead to 128.
• The Maximum TT size is set equal to 64 instead of 128.

The results, compared to ECM-19.0 are as follows for Class B:

-0.02% -0.63% -0.65% 94.6% 102.2% for the RA configuration.

The results, compared to ECM-19.0 are as follows for CTC:

-0.01% -0.21% -0.22% 98.2% 100.7% for the RA configuration.

The cross-checker found a similar encoding time decrease, but no decoding time increase.

It was agreed to modify the CTC as suggested in JVET-AO0145.