id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1095	Undefined behaviour when choosing longterm reference pictures.	peterderivaz		"In the derivation process for the RPS and picture marking (equation 8-6 of JCTVC-L1003_v34) what should happen if there is more than one reference picture in the DPB with slice_pic_order_cnt_lsb equal to PocLtCurr[i]?

For example, suppose MaxPicOrderCntLsb=16 and we have 4 short term frames in the DPB with POCs of 0,16,32,48. If the next picture decides to use:
NumPocLtCurr=1
CurrDeltaPocMsbPresentFlag=0
PocLtCurr[0]=0
Which reference frame should be put into RefPicSetLtCurr[0]?

The function TComSlice::xGetLongTermRefPic in the reference decoder simply selects the first match, but this behaviour does not appear to be defined in the specification.

I wonder if this situation is meant to never occur?  Section 8.3.2 ""Decoding process for reference picture set"" contains a number of requirements for bitstream conformance but they do not seem to rule out this case.

Perhaps I have overlooked some requirement?"	defect	closed	minor	HM-10.1	Text	D10 (L1003) v33	invalid		bbross wjhan jct-vc@…