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The syntax of the NAL unit format and the meaning of the NAL unit header fields are as defined in [RFC6184] section 5.3 and [RFC6190] section 4.2 with the following additional notes<3>:
PACSI NAL unit MUST be present in each layer in each access unit. It MUST be the first NAL unit of the layer. The PACSI NAL unit might be aggregated with NAL units into one STAP-A NAL unit. In that case it MUST be the first NAL unit present in the aggregated Single-Time Aggregation Packet type A (STAP-A) NAL unit.
PACSI NAL unit MUST NOT be fragmented.
When a NAL unit is larger than the maximum transmission unit (MTU) size, it MUST be fragmented into multiple Fragmentation Unit type A (FU-A) NAL units.
Multiple small NAL units of the same layer of the same access unit MAY be aggregated into one STAP-A NAL unit. The size of STAP-A NAL unit MUST NOT exceed the MTU size.
All other NAL unit types are passed to the decoder without any processing<4>.