SMPTE RDD 8-2008

Free TV Operational Practice OP-47 describes the technical/operational practices associated with the storage and distribution of closed caption/subtitling data in the vertical ancillary space of the 10-bit serial HD-SDI signal complying with ITU-R BT.1120-7. NOTE -- This document does not deal with the technical specifications of the actual closed captions/subtitles.

It is intended to ensure that closed captioned/subtitled high-definition program material, in accordance with the appropriate Australian and international standards, will be successfully delivered to end users via the broadcasters' storage and distribution processes.

Additional to storage and distribution of subtitles, this operational practice describes the use of other ancillary data such as wide screen signaling (WSS) information via a multi-packet solution.