dex SEI message syntax t10_dep_rep_index(payloadSize){ Descriptor t10_dep_rep_idx effective_idr_pic_id u(16) Rec. ITU-T H.264 (01/2012) G.13.1.12 Temporal level switching point SEI message syntax tl_switching_point( payloadSize ) { Descriptor delta_frame_num se(v) G.13.2 SEI payload semantics The semantics of the SEI messages with payloadType in the range of 0 to 23, inclusive, which are specified in clause D.2, are extended as follows: If payloadType is equal to 3, 8, 19, 20, or 22, the following applies: If the SEI message is not included in a scalable nesting SEI message, it applies to the layer representations of the current access unit that have dependency_id equal to 0 and quality id equal to 0. The semantics as specified in clause D.2 apply to the bitstream that would be obtained by invoking the bitstream extraction process as specified in clause G.8.8.1 with dIdTarget equal to 0 and qIdTarget equal to 0. All syntax elements and derived variables that are referred to in the semantics in clause D.2 are syntax elements and variables for layer representations with dependency_id equal to 0 and quality_id equal to 0. All SEI messages that are referred to in clause D.2 are SEI messages that apply to layer representations with dependency_ equal to 0 and quality_ions equal to 0. Otherwise (the SEI message is included in a scalable nesting SEI message), the SEI message applies to all layer representations of the current access unit for which DQId is equal to any value ( sei_dependency_id[i sei_quality_id[i with i in the range of 0 to hum_layer_representations_minus1, inclusive. For each value of i in the range of 0 to num_layer_representations_minus1,i inclusive, the semantics as specified in clause D.2 apply to the bitstream that would be obtained by invoking the bitstream extraction process as specified in clause G.8.8.1 with dIdTarget equal to sei_dependency_id[ i ] and qIdTarget equal to sei_quality_id[ All syntax elements and derived variables that are referred to in the semantics in clause D.2 are syntax elem