 sei_dependency_id[i All syntax elements and derived variables that are referred to in the semantics in clause D.2 are syntax elements and variables for dependency representations with dependency_id equal to sei_dependency_id[i]. All SEI messages that are referred to in clause D.2 are SEI messages that apply to dependency representations with dependency_id equal to sei_dependency_id[i]] When payloadType is equal to 10 for the SEI message that is included in a scalable nesting SEI message, the semantics for sub_seq_layer_num of the sub-sequence information SEI message is modified as follows: Rec. ITU-T H.264 (01/2012) sub_seq_layer_num specifies the sub-sequence layer number of the current picture. When the current picture resides in a sub-sequence for which the first picture in decoding order is an IDR picture, the value of sub_seq_layer_num shall be equal to 0. For a non-paired reference field, the value of sub_seq_layer_num shall be equal to 0. sub_seq_layer_num shall be in the range of 0 to 255, inclusive. Otherwise, if payloadType is equal to 0 or 1, the following applies: If the SEI message is not included in a scalable nesting SEI message, the following applies. When the SEI message and all other SEI messages with payloadType equal to 0 or 1 not included in a scalable nesting SEI message are used as the buffering period and picture timing SEI messages for checking the bitstream conformance according to Annex C and the decoding process specified in clauses 2-9 is used, the bitstream shall be conforming to this Recommendation | International Standard. The value of seq_parameter_set_id in a buffering period SEI message not included in a scalable nesting SEI message shall be equal to the value of seq_parameter_set_id in the picture parameter set that is referenced by the layer representation with DQId equal to 0 of the primary coded picture in the same access unit. Otherwise (the SEI message is included in a scalable nesting SEI message), the following applies. When the SEI message and all other SEI messages wi