id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
100	Bug with the selection of MVs for L1 references when AMVP is used	nsprljan		"In the function predInterSearch() for some cases motion estimation is bypassed (if (iRefList && iRefIdxTemp != iRefIdx[0])). Value of uiBits[iRefList] then does not include the rate of the MV, while uiCostTemp is set to MAX_UINT. The search for the best MVP is called in this case as well (function xCheckBestMVP()) and it can happen that it returns a negative value in uiBitsTemp and this causes integer overflow in uiCostTemp, which wraps around to small values. This leads to cases where this value (that should be MAX_UINT) is smaller than uiCost[0] and a L1 MV wrongly appears to be of a lower cost than L0 MV.

This wrap-around small value is in the range of 0xFFFF, so it creates problems in very few cases - only a minor effect on performance, but needs to be tested with a fix. Fix could be simple - just bypass the function xCheckBestMVP() or check whether ME was bypassed when calculating cost."	defect	closed	minor		HM		fixed		fbossen ksuehring davidf jct-vc@…