angement SEI message syntax frame_packing_arrangement(payloadSize) Descriptor frame_packing_arrangement_id ue(v) frame_packing_arrangement_cancel_flag if(!frame_packing_arrangement_cancel_flag) { rame_packing_arrangement_type quincunx_sampling_flag content_interpretation_type spatial_flipping_flag frame0_flipped_flag field_views_flag current_frame_is_frame0_flag frame0_self_contained_flag frame1_self_contained_flag if( !quincunx_sampling_flag && frame_packing_arrangement_type !=5){ frame0_grid_position_x frame0_grid_position_y framel_grid_position_> framel_grid_position_y rame_packing_arrangement_reserved_byte frame_packing_arrangement_repetition_per ue(v) rame_packing_arrangement_extension_flag D.1.26 Reserved SEI message syntax reserved_sei_message(payloadSize) { Descriptor ;i<payloadSize;it+ reserved_sei_message_payload_byte SEI payload semantics D.2.1 Buffering period SEI message semantics The presence of the buffering period SEI message in the bitstream is specified as follows: If NalHrdBpPresentFlag is equal to 1 or VclHrdBpPresentFlag is equal to 1, one buffering period SEI message can be present in any access unit of the bitstream, and one buffering period SEI message shall be present in every IDR access unit and every access unit associated with a recovery point SEI message. Otherwise (NalHrdBpPresentFlag is equal to 0 and VclHrdBpPresentFlag is equal to 0), no buffering period SEI messages shall be present in any access unit of the bitstream. NOTE 1 - For some applications, the frequent presence of a buffering period SEI message may be desirable. A buffering period is specified as the set of access units between two instances of the buffering period SEI message in decoding order. Rec. ITU-T H.264 (01/2012) seq_parameter_set_id specifies the sequence parameter set for the current coded video sequence. The value of seq_parameter_set_id shall be equal to the value of seq_parameter_set_id in the picture parameter set referenced by the primary coded picture associated with the buffering period SEI message. T