f dependency_id that a bitstream adaptation process has used to generate a bitstream subset subBitstreamA that contains dependency representations with dependency_id less than or equal to dId and temporal_i id less than tId of an input bitstream (that is conforming to this Recommendation | International Standard) until the current access unit, exclusive. The bitstream adaptation process can infer from a temporal level switching point SEI message whether or not the bitstream subset containing subBitstreamA and the dependency representations with dependency_ic less than or equal to dId and temporal id less than or equal to tId of the input bitstream starting from the current access unit, inclusive, is conforming to this Recommendation | International Standard. The temporal level switching point SEI message shall not be present in access units with temporal_i id equal to 0. The temporal level switching point SEI message shall be included in a scalable nesting SEI message. For the scalable nesting SEI message that contains the temporal level switching point SEI message, Il_layer_representations_in_au_flag shall be equal to 1 or the value of sei_quality_id[i] shall be equal to 0 for all values of i in the range of 0 to num_layer_representations_minus1, inclusive. The following semantics apply independently to each value of ei_dependency_id[ indicated by the scalable nesting SEI message containing the temporal level switching point SEI message. The current access unit, i.e., the access unit associated with the temporal level switching point SEI message, may or may not contain a dependency representation with dependency_i equal to sei_dependency_id[i]. When the current access unit contains a dependency representation with dependency_id equal to ei_dependency_id[ the following semantics apply. The following semantics are specified in a way that they apply to a bitstream conforming to this Recommendation International Standard for which DependencyIdMax for the current access unit is equal to sei_dependency_id[i] Let the s