id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
929	Deblocking filter boundary strength derivation bug (encoder)	mcoban		"Unitialized motion vector information is used during the boundary strength derivation on the encoder side leading to encoder/decoder mismatches. The xGetBoundaryStrengthSingle() function assumes the motion vectors of refIdx < 0 blocks have the value 0.

e.g.

xGetBoundaryStrengthSingle()
.....

        if ( ((piRefP0==piRefQ0)&&(piRefP1==piRefQ1)) || ((piRefP0==piRefQ1)&&(piRefP1==piRefQ0)) )
        {
          uiBs = 0;
          if ( piRefP0 != piRefP1 )   // Different L0 & L1
          {
            if ( piRefP0 == piRefQ0 )
            {
              pcMvP0 -= pcMvQ0;   pcMvP1 -= pcMvQ1;
              uiBs = (pcMvP0.getAbsHor() >= 4) | (pcMvP0.getAbsVer() >= 4) |
              (pcMvP1.getAbsHor() >= 4) | (pcMvP1.getAbsVer() >= 4);

.....

If piRefP1==piRefQ1==NULL and piRefP0 == piRefQ0 && piRefP0 != NULL, motion vector information of P1 partition is used in uiBs derivation.

following patch should address the issue"	defect	new	minor	HM-9.2	HM	HM-9.1