sages with subsets of a bitstream. A scalable nesting SEI message shall contain one or more SEI messages with payloadType not equal to 30 and it shall not contain any SEI message with payloadType equal to 30. An SEI message contained in a scalable nesting SEI message is referred to as a nested SEI message. An SEI message not contained in a scalable nesting SEI message is referred to as a non-nested SEI message. The scope to which the nested SEI message applies is indicated by the syntax elements all_layer_representations_in_au_flag num_layer_representations_minus1, sei_dependency_id[i] sei_quality_id[i sei_temporal_io when present. A buffering period SEI message and an SEI message of any other type shall not be nested in the same scalable nesting SEI message. A picture timing SEI message and an SEI message of any other type shall not be nested in the same scalable nesting SEI message. all_layer_representations_in_ equal to 1 specifies that the nested SEI message applies to all layer representations of the access unit. .all_layer_representations_in_au_flag equal to 0 specifies that the scope of the nested SEI message is specified by the syntax elements num_layer_representations_minus1 sei_dependency_id[i] sei_quality_id[ and sei_temporal_id. num_layer_representations_minus1p plus 1 specifies, when num_layer_representations_minus1i is present, the number of syntax element pairs sei_dependency_id[i] and sei_quality_id| that are present in the scalable nesting SEI message. When num_layer_representations_minus is not present, it shall be inferred to be equal to numSVCLayers - 1) with numSVCLayers being the number of layer representations that are present in the primary coded picture of the access unit. The value of num_layer_representations_minus shall be in the range of 0 to 127, inclusive. sei_dependency_id[ i ] and sei_quality_id[i] indicate the dependency id and the quality id values, respectively, of the layer representations to which the nested SEI message applies. The access unit may or may not contain layer re