invalid block vector for IBC detected

[fbarbier]

After the latest commit (tested version is 0b6523f2ceb7371c7788cdb49b8a76dd8e3abc5e), some encoded streams seems to be uncompliants.

Please find the following commands to reproduce:

git checkout 0b6523f2ceb7371c7788cdb49b8a76dd8e3abc5e

cd build
cmake .. -DCMAKE_BUILD_TYPE=Debug
make -j 8
cd ..

./bin/EncoderAppStaticd --SourceWidth=8 --SourceHeight=200 --InputChromaFormat=420 --InputBitDepth=10 --Profile=next --FrameRate=60 --FramesToBeEncoded=3 --GOPSize=4 --Frame1="B 1 5 -6.5 0.2590 0 0 1.0 0 0 0 4 4 1 5 9 13 0 0" --Frame2="B 2 4 -6.5 0.2590 0 0 1.0 0 0 0 4 4 1 2 6 10 0 0" --Frame3="B 3 5 -6.5 0.2590 0 0 1.0 0 0 0 4 4 1 3 7 11 0 0" --Frame4="B 4 1  0.0 0.0    0 0 1.0 0 0 0 4 4 1 4 8 12 0 0" --FastSearch=2 --LCTUFast=1 --CTUSize=64 --MaxPartitionDepth=5 --PCMEnabledFlag=1 --SAO=1 --LoopFilterDisable=1 --ALF=0 --DisableIntraInInter=1 --DepQuant=1 --DualITree=1 --LMChroma=0 --TransformSkip=0 --MaxDeltaQP=0 --MTS=3 --IBC=1 --IMV=0 --Affine=1 --AffineType=1 --AffineAmvr=0 --MHIntra=0 --Triangle=1 --MIP=1 --SMVD=1 --SBT=1 --BDPCM=1 -i source.yuv -b encoded.vvc
./bin/DecoderAppStaticd -b encoded.vvc -o /dev/null

Output at decoding is the following:

VVCSoftware: VTM Decoder Version 6.0rc1 [Linux][GCC 8.2.0][64 bit] [SIMD=AVX] 
Note: found NAL_UNIT_ACCESS_UNIT_DELIMITER
terminate called after throwing an instance of 'Exception'
  what():  
ERROR: In function "xDeriveCUMV" in /home/fredb/projects/vtm/source/Lib/DecoderLib/DecCu.cpp:1092: invalid block vector for IBC detected.

[ksuehring]

Rather unlikely to be related to 0b6523f2ceb7371c7788cdb49b8a76dd8e3abc5e, because this only removes (the else branch of) a macro, which was already enabled.

[ksuehring]

May this be related to --SourceWidth=8?

[XiangLi]

The issue is related t BDPCM signaling. Please find a fix ​https://vcgit.hhi.fraunhofer.de/jvet/VVCSoftware_VTM/merge_requests/865

[fbarbier]

Thanks Xiang for the fix.

Looking at MR 865, may you indicate me in the spec the sentence saying that 'When transform skip is disabled, BDPCM is not allowed' ?

Thanks for your feedback