 being equal to 0. pic_order_cnt_type is equal to 0 for both and either pic_order_cnt_lsb differs in value, or delta_pic_order_cnt_bottom differs in value. - pic_order_cnt_type is equal to 1 for both and either delta_pic_order_cnt[ 0] differs in value, or delta_pic_order_cnt 1] differs in value. Rec. ITU-T H.264 (01/2012) IdrPicFlag differs in value. IdrPicFlag is equal to 1 for both and differs in value. NOTE 2 - Some of the VCL NAL units in redundant coded pictures or some non-VCL NAL units (e.g., an access unit delimiter NAL unit) may also be used for the detection of the boundary between access units, and may therefore aid in the detection of the start of a new primary coded picture. 7.4.1.2.5 Order of VCL NAL units and association to coded pictures This clause specifies the order of VCL NAL units and association to coded pictures for coded video sequences that conform to one or more of the profiles specified in Annex A and are decoded using the decoding process specified in clauses 2-9. Each VCL NAL unit is part of a coded picture. The order of the VCL NAL units within a coded IDR picture is constrained as follows: If arbitrary slice order is allowed as specified in Annex A, coded slice of an IDR picture NAL units may have any order relative to each other. Otherwise (arbitrary slice order is not allowed), the following applies: If separate_colour_plane_ is equal to 0, coded slice of an IDR picture NAL units of a slice group shall not be interleaved with coded slice of an IDR picture NAL units of another slice group and the order of coded slice of an IDR picture NAL units within a slice group shall be in the order of increasing macroblock address for the first macroblock of each coded slice of an IDR picture NAL unit of the particular slice group. Otherwise (separate_colour_plane_flag is equal to 1), coded slice of an IDR picture NAL units of a slice group for a particular value of colour_plane_id shall not be interleaved with coded slice of an IDR picture NAL units of another slice group with the same value 