id summary reporter owner description type status priority milestone component version resolution keywords cc 1206 Mismatch with reference decoder when decoding cbf_luma when using intra block copying peterderivaz "Suppose you are encoding a coding unit with CuPredMode=MODE_INTRA and intra_bc_flag=1, and that there is no chroma residual and the transform unit is not split. If there was no luma residual, then rqt_root_cbf will be set to 0 and all is well. However, if there is some luma residual to be coded then: 1. rqt_root_cbf will be set to 1 2. transform_tree will be coded 3. split_transform_flag set to 0 4. cbf_cb set to 0 5. cbf_cr set to 0 at this point the expression in 7.3.8.8 Transform Tree SYntax: ( CuPredMode[ x0 ][ y0 ] = = MODE_INTRA | | trafoDepth != 0 | | cbf_cb[ x0 ][ y0 ][ trafoDepth ] | | cbf_cr[ x0 ][ y0 ][ trafoDepth ] | | ( ChromaArrayType = = 2 && ( cbf_cb[ x0 ][ y0 + ( 1 << ( log2TrafoSize − 1 ) ) ][ trafoDepth ] | | cbf_cr[ x0 ][ y0 + ( 1 << ( log2TrafoSize − 1 ) ) ][ trafoDepth ] ) ) ) is tested, and will evaluate to true so the specification says we should encode cbf_luma. However, the reference code does not encode cbf_luma (line 501 of TDecEntropy.cpp). I believe the reference code is right because we can deduce that cbf_luma must be 1 in this case, so it does not need to be coded." defect closed major RExt D5 RExt text RExt D5 (O1005) v1 fixed davidf joel teruhiko jct-vc@…