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Chapter 9. Media Streaming > Synchronizing Data with Video

9.7. Synchronizing Data with Video

The key technical challenge when attempting to synchronize data with video is the lack of data transmission and decoding time guarantees needed to achieve accurate frame synchronization of the data. For example, a problem occurs when complex data objects with long decoding times are combined with time-line (PCR) discontinuities. In this circumstance, there can be ambiguity in the meaning of the PTS value in the encapsulation.

The ATSC A93 Synchronized/Asynchronous Trigger Standard was designed to address this situation, as well as other complications [A93]. It allows an arbitrary complex DAU to be activated by an arbitrary simplified receiver to achieve tight synchronization in the context of a discontinuous time line. The reminder of this section describes ATSC A93; at the time of writing this book, I am not aware of a parallel DVB or ISO standard.


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