Patent ID: 7983303

Claim:
A method of modifying a transport stream for use by at least two Single Frequency Networks (SFNs), each having a different modulation scheme, the method comprising: receiving an input transport stream of packets including a number of mega frames; extracting mega frame information from the packets; determining the start of a mega frame; counting the packets; generating a watermark using the extracted mega frame information, the packet count, and modulation parameters of the different modulation schemes for synchronous re-multiplexing of the transport stream using either of the different modulation schemes of the at least two SFNs; generating an Mega-Frame Initialization Packet (MIP) including the watermark; inserting the MIP in each mega frame of an output transport stream of packets at a position in the mega frame corresponding to the number of the mega frame in the output transport stream; and outputting the transport stream.