witch-to dependency representation be the dependency representation in the current access unit that has dependency_id equal to sei_dependency_ id| and let maxFrameNum be the value of MaxFrameNum for the SVC sequence parameter set that is the active SVC sequence parameter set for the current access unit (with DependencyIdMax equal to ei_dependency_id[ delta_frame_num indicates the difference between the frame_num values of the switch-to dependency representation and the dependency representation with dependency_id equal to i_dependency_id[i in the required access unit, as specified subsequently. The value of delta_frame_num shall be in the range of 1 maxFrameNum to maxFrameNum 1, inclusive. Let currFrameNum be the frame num value of the switch-to dependency representation. The variable requiredFrameNum is set equal to currFrameNum - delta_frame_num. Let lastIdrAU be the most recent access unit in decoding order that contains a dependency representation with dependency_ equal to sei_dependency_id[ and IdrPicFlag equal to 1. The bitstream shall contain an access unit that succeeds the access unit lastIdrAU and precedes the current access unit in decoding order and contains a dependency representation with frame_num equal to requiredFrameNum and dependency_id equal to sei_dependency_id[i] The most recent access unit in decoding order that contains a dependency representation with frame_num equal to requiredFrameNum and dependency_ic equal to Rec. ITU-T H.264 (01/2012) sei_dependency_id[ is referred to as the required access unit. The required access unit shall have a value of temporal_i id that is equal to tId - 1. The current access unit and all subsequent access units in decoding order for which temporal_id is less than or equal to tId shall not reference any of the following access units through inter prediction in the decoding process specified in clause G.8: access units that precede the required access unit in decoding order and have temporal equal to tId - 1, access units that precede the current access unit i