What are the bytes that follow the header byte in an MPEG packet?

What are the bytes that follow the header byte in an MPEG packet?

The bytes that follow the header byte in a packet are the payload. For example, the payload of a transport stream packet includes the PES_packet_header and its PES_packet_data_bytes or pointer_field and PSI sections, or private data. A PES_packet_payload, however, consists only of PES_packet_data_bytes. The transport stream packet header and adaptation fields are not payload.