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US 7,924,886 B2Granted
Deterministic program clock reference re-stamping for synchronous bit rate adaptation based on mega-frame initialization packet
AssigneeScreen Service Broadcasting Technologies S.p.A.
InventorMichele Bargauan
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Abstract
A system and processes create a transport stream carrying several encapsulated contents, watermarks, and other ancillary data. The transport stream is re-multiplexed while keeping synchronous and deterministic operation. Synchronous deterministic operation allow each derived transport stream to be broadcasted in Single Frequency Networks, as all re-multiplexers have the same signal at the input and selecting the same content generates exactly the same stream in multiple locations.
Claims6
A method of program clock reference (PCR) adaptation for an output transport stream, the method comprising:
- receiving an input transport stream of packets;
- extracting a time mark packet from the packets in the input transport stream;
- determining a time period from the time mark;
- computing an input time base count for a first packet of the input transport stream within the time period and an output time base count for a first packet of the output transport stream determined from the time mark;
- linearly incrementing the input time base count for each additional packet of the input transport stream within the time period and linearly incrementing the output time base count for each packet of the output transport stream;
- determining the difference between the input time base count and the output time base count corresponding to a packet in the output stream including a PCR;
- and
- adapting the PCR for the packet in the output transport stream including the PCR by adjusting the PCR for the determined difference.
5 more elements
Dependencies are inferred from the claim text.