layer SVC sequence parameter set RBSP for a coded picture is a sequence parameter set RBSP, any sequence parameter set RBSP with the value of seq_parameter_set_id for the active layer SVC sequence parameter set RBSP for the coded picture shall have the same content as that of the active layer SVC sequence parameter set RBSP for the coded picture unless it follows the last access unit of the coded video sequence Rec. ITU-T H.264 (01/2012) containing the coded picture and precedes the first VCL NAL unit and the first SEI NAL unit containing a buffering period SEI message (when present) of another coded video sequence. When the active layer SVC sequence parameter set RBSP for a coded picture is a subset sequence parameter set RBSP, any subset sequence parameter set RBSP with the value of seq_parameter_set_i for the active layer SVC sequence parameter set RBSP for the coded picture shall have the same content as that of the active layer SVC sequence parameter set RBSP for the coded picture unless it follows the last access unit of the coded video sequence containing the coded picture and precedes the first VCL NAL unit and the first SEI NAL unit containing a buffering period SEI message (when present) of another coded video sequence. NOTE 6 - If picture parameter set RBSP or SVC sequence parameter set RBSP are conveyed within the bitstream, these constraints impose an order constraint on the NAL units that contain the picture parameter set RBSP or SVC sequence parameter set RBSP, respectively. Otherwise (picture parameter set RBSP or SVC sequence parameter set RBSP are conveyed by other means not specified in this Recommendation International Standard), they must be available to the decoding process in a timely fashion such that these constraints are obeyed. When a sequence parameter set NAL unit with a particular value of seq_parameter_set_id is received, its content replaces the content of the previous sequence parameter set NAL unit, in decoding order, with the same value of seq_parameter_set (when a previous sequ