ure timing SEI messages, whether present in the bitstream (by non-VCL NAL units) or conveyed equivalently by other means not specified in this Recommendation | International Standard, shall have dpb_output_delay equal to 0. The level constraints specified for the High 4:2:2 Intra profile in clause A.3 shall be fulfilled. Conformance of a bitstream to the High 4:2:2 Intra profile is indicated by constraint_set3_flag being equal to 1 with profile_idc equal to 122. Decoders conforming to the High 4:2:2 Intra profile at a specific level shall be capable of decoding all bitstreams in which all of the following conditions are true: profile_idc is equal to 100, 110, or 122, constraint set3 is equal to 1, level idc represents a level less than or equal to the specified level. The operation of the deblocking filter process specified in clause 8.7 is not required for decoder conformance to the High 4:2:2 Intra profile. NOTE - The deblocking filter process specified in clause 8.7 or some similar post-processing filter should be performed, although this is not a requirement for decoder conformance to the High 4:2:2 Intra profile. The syntax elements sent by an encoder for control of the deblocking filter process specified in clause 8.7 are considered only as advisory information for decoders conformance to the High 4:2:2 Intra profile. However, the application of the deblocking filter process specified in clause 8.7 is required for decoder conformance to the High 4:2:2, and High 4:4:4 Predictive profiles when decoding bitstreams that conform to the High 4:2:2 Intra profile. A.2.10 High 4:4:4 Intra profile Bitstreams conforming to the High 4:4:4 Intra profile shall obey the following constraints: All constraints specified in clause A.2.7 for the High 4:4:4 Predictive profile shall be obeyed. All pictures shall be IDR pictures. Sequence parameter sets shall have max_num_ref_frames equal to 0. When vui parameters_present_flagi is equal to 1 and bitstream_restriction_flag is equal to 1, sequence parameter sets shall have max_num