It seems that the horizontal luma resampling operation uses incorrect support in draft 6 (JCTVC-Q1008_v2). The vertical sample location for the reference layer picture is incorrect in equation H-47

yPosRL = Clip3( 0, RefLayerPicHeightInSamplesY − 1, yRef + n − 1 )

The correct equation should be:

yPosRL = Clip3( 0, RefLayerPicHeightInSamplesY − 1, yRef + n − 3 )

Problem: In HEVC specification, picture type such as short term or long term is involved in the motion vector scaling. In HEVC, picture type of the reference pictures is defined at the time when the picture was current, particularly

The function LongTermRefPic( aPic, aPb, refIdx, LX ), with X being 0 or 1, is defined as follows: – If the picture with index refIdx from reference picture list LX of the slice containing prediction block aPb in the picture aPic was marked as "used for long term reference" at the time when aPic was the current picture, LongTermRefPic( aPic, aPb, refIdx, LX ) is equal to 1. – Otherwise, LongTermRefPic( aPic, aPb, refIdx, LX ) is equal to 0.

In SHVC, derived inter-layer reference picture can be used as a collocated picture and the picture type of its reference pictures can be involved in the motion vector scaling. However, since derived inter-layer reference picture is not a coded picture, it was not a current picture when LongTermRefPic is defined. So, the status of the derived inter-layer reference picture being current has to be defined for the marking purpose of its reference pictures to be complaint with the HEVC motion vector scaling process and “HLS” only concept.

Possible solution: The solution can be the following, by setting the resampled picture to be current during the motion field resampling (marked with bold): ... – When VpsInterLayerMotionPredictionEnabled[ LayerIdxInVps[ currLayerId ] ][ LayerIdxInVps[ rLId ] ] is equal to 1, the following steps apply: – The resampled picture rsPic is set to be the current picture at the time when the reference layer picture rlPic is the current picture – A single slice rsSlice of the resampled picture rsPic is generated as follows: ...

The array m_maxTSLayerMinus1 is declared in TComSlice.h as

UInt m_maxTSLayerMinus1[MAX_VPS_LAYER_ID_PLUS1 - 1];

It should be

UInt m_maxTSLayerMinus1[MAX_VPS_LAYER_ID_PLUS1];

because the #sub-layers is signalled for each layer; hence "-1" should not be there.