[Reference text taken from WD5-d5] In step 6 of 8.4.2.1.8 (Derivation process for temporal luma motion vector prediction), the value of N is not correctly defined in “with N being value of RefIdxLX”.

It was suggested by the editor team to replace the following paragraph:

• If all PicOrderCnts of pictures in all reference picture lists are smaller than PicOrderCnt( currPic ), the motion vector mvCol, the reference index refIdxCol and ListCol are set equal to MvLN[ xPCol ][ yPCol ], RefIdxLN[ xpCol ][ ypCol ] and LN, respectively, with N being value of RefIdxLX.
• Otherwise (one of PicOrderCnt of pictures in all reference picture lists are larger than PicOrderCnt( currPic ) ), the motion vector mvCol, the reference index refIdxCol and ListCol are set equal to MvLN[ xPCol ][ yPCol ], RefIdxLN[ xpCol ][ ypCol ] and LN, respectively, with N being value of collocated_from_l0_flag.

by this one:

• If PicOrderCnt( pic ) of every picture pic in every reference picture list is less than or equal to PicOrderCnt( currPic ), the motion vector mvCol, the reference index refIdxCol and ListCol are set equal to MvLX[ xPCol ][ yPCol ], RefIdxColLX and LX, respectively, with X being the value of X this process is invoked for.
• Otherwise (PicOrderCnt( pic ) of at least one picture pic in at least one reference picture list is greater than PicOrderCnt( currPic )), the motion vector mvCol, the reference index refIdxCol and ListCol are set equal to MvLN[ xPCol ][ yPCol ], RefIdxColLN and LN, respectively, with N being the value of collocated_from_l0_flag.

In several instances, the WD text uses the "FL" binarization to describe the parsing for fixed-length decode-bypass syntax elements. In the description of the FL binarization, it is specified as least-significant-bin-first order.

However, the HM software for these bypass syntax elements codes them in most-significant-bin-first order. See the following HM function:

TDecBinCABAC::decodeBinsEP

Either the text or the software needs to be changed in these cases.

abs_diff_pic_num_minus1 and abs_diff_pic_num_minus1 are not included in refernce picture list modification syntax anymore. The following semantics shall be removed from 7.4.3.2.

abs_diff_pic_num_minus1 plus 1 specifies the absolute difference between the picture number of the picture being moved to the current index in the list and the picture number prediction value. abs_diff_pic_num_minus1 shall be in the range of 0 to MaxPicNum − 1. The allowed values of abs_diff_pic_num_minus1 are further restricted as specified in subclause 8.2.2.3.1. [Ed. (TW): clarify the following paragraph] long_term_pic_num specifies the long-term picture number of the picture being moved to the current index in the list. When decoding a coded frame, long_term_pic_num shall be equal to a LongTermPicNum assigned to one of the reference frames or complementary reference field pairs marked as "used for long-term reference". When decoding a coded field, long_term_pic_num shall be equal to a LongTermPicNum assigned to one of the reference fields marked as "used for long-term reference".