Patent ID: 7298741
Filing Date: 2007-11-20
Classification: H04N

Abstract:
1. A method for robust Motion Picture Experts Group (MPEG-2) multiplexing information using an adjustable time stamp, the method comprising: accepting a plurality of digital programs; encoding each program into frames; generating a decoding time stamp (DTS) and a corresponding presentation time stamp (PTS), measured with respect to a program clock reference (PCR) for each frame; generating a packetized elementary stream (PES) packet, with a PES header including the PCR, DTS, and PTS, for each frame; time division multiplexing (TDM) the PES packets into a MPEG-2 transport stream; at the time of multiplexing the MPEG-2 transport stream, comparing the DTS and PTS values to the PCR value in each header to find that: PCR>PTS>DTS; and, modifying the DTS and PTS values in the PES header in response to the comparison as follows: generating a value Δt=PCR−DTS; setting the DTS value equal to the PCR value; and, setting PTS=PTS+Δt.