The Decode Time Stamp (DTS) indicates the time at which an access unit should be instantaneously removed from the receiver buffer and decoded.  It differs from the Presentation Time Stamp (PTS) only when picture reordering is used for B pictures.  If DTS is used, PTS must also be provided in the bit stream.

PTS (or DTS) is entered in the bitstream at intervals not exceeding 700 mS.  ATSC further constrains PTS (or DTS) to be inserted at the beginning of each access unit.

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