re C-1 - Structure of byte streams and NAL unit streams for HRD conformance checks The syntax elements of non-VCL NAL units (or their default values for some of the syntax elements), required for the HRD, are specified in the semantic clauses of clause 7, Annexes D and E, and clauses G.7, G. 113, G.14, H.7, H.13, and H.14. Two types of HRD parameter sets (NAL HRD parameters and VCL HRD parameters) are used. The HRD parameter sets are signalled as follows: When the coded video sequence conforms to one or more of the profiles specified in Annex A and the decoding process specified in clauses 2-9 is applied, the HRD parameter sets are signalled through video usability information as specified in clauses E.1 and E.2, which is part of the sequence parameter set syntax structure. When the coded video sequence conforms to one or more of the profiles specified in Annex G and the decoding process specified in Annex G is applied, the HRD parameter sets are signalled through the SVC video usability information extension as specified in clauses G.14.1 and G.14.2, which is part of the subset sequence parameter set syntax structure. NOTE 1 - For coded video sequences that conform to both, one or more of the profiles specified in Annex A and one or more of the profiles specified in Annex G, the signalling of the applicable HRD parameter sets is depending on whether the decoding process specified in clauses 2-9 or the decoding process specified in Annex G is applied. When the coded video sequence conforms to one or more of the profiles specified in Annex H and the decoding process specified in Annex H is applied, the HRD parameter sets are signalled through the MVC video usability information extension as specified in clauses H.14.1 and H.14.2, which is part of the subset sequence parameter set syntax structure. Rec. ITU-T H.264 (01/2012) NOTE 2 - For coded video sequences that conform to both, one or more of the profiles specified in Annex A and one or more of the profiles specified in Annex H, the signalling of the applicable 