ut to this clause, pIdTarget is inferred to be equal to 63. When tIdTarget is not present as input to this clause, tIdTarget is inferred to be equal to 7. When dIdTarget is not present as input to this clause, dIdTarget is inferred to be equal to 7. When qIdTarget is not present as input to this clause, qIdTarget is inferred to be equal to 15. The sub-bitstream is derived by applying the following operations in sequential order: 1. Mark all VCL NAL units and filler data NAL units for which any of the following conditions are true as "to be removed from the bitstream": priority_ id is greater than pIdTarget, temporal id is greater than tIdTarget, dependency_i is greater than dIdTarget, dependency_id is equal to dIdTarget and quality_id is greater than qIdTarget. 2. Remove all access units for which all VCL NAL units are marked as "to be removed from the bitstream". 3. Remove all VCL NAL units and filler data NAL units that are marked as "to be removed from the bitstream". 4. When dIdTarget is equal to 0 and qIdTarget is equal to 0, remove the following NAL units: all NAL units with nal_unit_type equal to 14 or 15, all NAL units with nal_unit_type equal to 6 in which the first SEI message has payloadType in the range of 24 to 35, inclusive. Rec. ITU-T H.264 (01/2012) 5. Remove all NAL units with nal_unit_type equal to 6 that only contain SEI messages that are part of a scalable nesting SEI message with any of the following properties: sei_temporal_id is greater than tIdTarget, the minimum value of sei_dependency_id[i + sei_quality_id[ for all i in the range of 0 to num_layer_representations_minus1, inclusive, is greater than dIdTarget <<4) + qIdTarget. 6. Remove all NAL units with nal_unit_type equal to 6 that contain SEI messages with payloadType equal to 24, 28, or 29. G.8.8.2 Specification of the base layer bitstream Each scalable bitstream that conforms to this specification shall contain a base layer bitstream that conforms to one or more of the profiles specified in Annex A. This base layer bitstream is deriv