SMPTE 291M-2006

1.1 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 525 line, 625 line, component or composite, and high definition digital television interfaces (750 and 1125 lines) and D-Cinema applications that provide 8-bit or 10-bit data ancillary data space.

1.2 Space available for ancillary data packets is defined in the document specifying the connecting interface.

1.3 Ancillary data packet payload definitions for a specific application shall be according to a SMPTE standard, a Recommended Practice, an Engineering Guideline or a document generated by another organization. When a payload format is considered a registered format, an application document is required and the ancillary packet is identified by a registered data identification word.