Note
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Whenever higher layers send an H.264 NAL unit and the NAL unit is very small, the sender is not required to send it out right away. Instead, it can buffer the NAL unit, wait to receive the next NAL unit from higher layers, and aggregate the next NAL unit with the previously received or aggregated NAL units into a new STAP-A aggregation packet.
Whenever higher layers send an H.264 NAL unit and the NAL unit does not fit into one RTP packet because the NAL unit size is larger than the maximum transmission unit (MTU) size, the NAL unit MUST be fragmented into multiple FU-A NAL units.