In TEncSearch.cpp between line 1493 and 1494, as well as between line 7039 and 7040, the following three lines need to be added:

#if HHI_MRG

m_pcEntropyCoder->encodeMergeInfo( pcCU, 0, true );

#endif

This fixes the issue, that an incorrect bitrate is estimated for RD-decisions.

In TEncEntropy.cpp between line 382 and 383, the following needs to be added:

if ( pcCU->getSlice()->isIntra() ) {

return;

}

This avoids the encoding of unwanted merge flags.

In TEncEntropy.cpp between line 900 and 901, the following needs to be added:

if( bRD )

uiAbsPartIdx = 0;

This corrects a wrong determination of merge candidates during the estimation process.

All line numbers are valid for version 0.6.

Dear Frank,

I noticed that the parallel V2V coding (symbolMode : 3) is broken in revision 0.6/0.7. This could be reproduced by setting symbolMode : 3 in the \cfg\encoder*.cfg files, and encoding. By comparing the encoded *.bin bitstream with that generated by setting "symbolMode : 1" (CABAC), it was noticed that the V2V bitstream was way bigger than that of the CABAC bitstream, while if V2V worked the way it supposed to be, the two bitstreams should be of the almost the same size.

A careful analysis showed that the default setting of

multiCodewordThreshold : 96000 # Threshold for multi-codeword coding

in the config file caused this problem. In the parallel V2V coding, only one CABAC is used to obtain the statistics for V2V coding, no matter what value "multiCodewordThreshold" is set.

The fix would be adding a validation check in TAppEncCfg.cpp:

Void TAppEncCfg::xCheckParameter() { …

if(m_iSymbolMode == 3) {

m_uiMCWThreshold = 0;

}

… }

After applying this fix, the size of the encoded bitstream using V2V (symbolMode :3) should be verified as very close to that of CABAC.

Besides, we did some improvement/cleaning for the V2V codes based on TMuC 0.7, and we attach the corresponding files

\source\App\TAppEncoder\TAppEncCfg.cpp \source\Lib\TLibEncoder\TEncGOP.cpp \source\Lib\TLibEncoder\TEncSlice.cpp \source\Lib\TLibDecoder\TDecTop.cpp

Please let us know how the fix/improvement goes, and if there is any problem, do not hesitate to contact us.

Best regards, Jinwen

Corrupt bitstream and encoder/decoder mismatch for

SymbolMode=0

and

#define HHI_TRANSFORM_CODING 0

I expect a fix within a day or so.