SMPTE ST 291:2011

Ancillary Data Packet and Space Formatting (Revision of SMPTE ST 291-2010). This standard specifies the basic formatting structure of the ancillary data space in digital video data streams in the form of 10-bit words. Application of this standard includes, but is not limited to, 525-line and 625-line standard definition digital television interfaces (component or composite), and high definition digital television interfaces (750 and 1125 lines) and D-Cinema interfaces that provide 8-bit or 10-bit data ancillary data spaces. Space available for ancillary data packets is defined in the documents specifying connecting interface. Ancillary data packet payload definitions for a specific application are specified by a SMPTE Standard, Recommended Practice, or Registered Disclosure Document, or by a document generated by another organization, company, or an individual (Entity). When a payload format is registered with SMPTE, an application document describing the payload format is required, and the registered ancillary data packet is identified by a registered data identification word.