The parameters for chroma-QP-adjustment (not to be confused
with chroma-QP-offsets) are not searched for, but instead a
checkerboard pattern is used when this feature is enabled.

The granularity of this checkerboard pattern is down to the
size of a CU. However, chroma-qp-adjustment can be restricted
to be signalled at a higher depth. Currently, the encoder
ignores this limit when calculating the 'm_ChromaQpAdjIdc',
leading to an encoder-decoder mismatch.

eg

./bin/TAppEncoderStatic -c cfg/encoder_intra_main_rext.cfg

-c BasketballPass.cfg
--SEIDecodedPictureHash=1
-f 1
--MaxCUChromaQpAdjustmentDepth=1

will produce a stream that the decoder will mismatch.

A possible fix is to adjust the checkerboard to match the
granularity of the signalling.

In TEncCu::xCompressCU,

Int lgMinCuSize =

pcSlice->getSPS()->getLog2MinCodingBlockSize();

Change to

Int lgMinCuSize =

pcSlice->getSPS()->getLog2MinCodingBlockSize() +

std::max<Int>(0,

pcSlice->getSPS()->getLog2DiffMaxMinCodingBlockSize() -
pcSlice->getPPS()->getMaxCuChromaQpAdjDepth());