This Standard defines the basic structure and timing requirements of an asynchronous serial audio metadata stream with respect to an associated video signal. These requirements apply to the serial metadata streams either present on asynchronous serial data communications links between devices or present in the vertical ancillary (VANC) data packets transported by the video signal. The Standard also defines the Data ID (DID) and Secondary Data ID (SDID) values used to identify the VANC packets themselves and to associate the metadata in VANC packets with specific audio programs.
Associated Standards SMPTE 2020-2 and SMPTE 2020-3 define two methods of mapping the metadata into ancillary data packets.
Associated Standards SMPTE 2020-2 and SMPTE 2020-3 define two methods of mapping the metadata into ancillary data packets.
More SMPTE standard pdf
SMPTE ST 318:2015
Television and Audio - Synchronization of 59.94- or 50-Hz Related Video and Audio Systems in Analog and Digital Areas - Reference Signals
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