CONFIG_ATC_DCTX_ALIGNED: implements unintended behavior when reduced-tx-type-set is enabled
What version / commit were you testing with?
What steps will reproduce the problem?
- Run AVM encoder commit 46c9dd51 with --reduced-tx-type-set=1 on top of CTC
What is the expected output?
The intended design from CWG-C073 (adopted as candidate) allows ADST_ADST transform for intra when reduced-tx-type-set is enabled
What do you see instead?
Implementation under CONFIG_ATC_DCTX_ALIGNED disables ADST_ADST for intra if reduced-tx-type-set is enabled. This is a bug leading to an unintended design.
Please use labels and text to provide additional information.
A fix will be available soon:
- The fixed design based on adopted CWG-C073 provides -1.27% AI YPSNR BD-rate and about -0.5% RA YPSNR BD-rate gains over the AVM-46c9dd51 (Overall Mandatory w/o B2) when reduced-tx-type-set is enabled in both anchor and test.
- The change only has an impact when reduced-tx-type-set is enabled.
- The fix is a lossless change under CTC.