Useful data in TS (Transport Stream). Payload refers to the bytes which follow the header byte in a packet. 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.