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Method and apparatus for preserving synchronization of audio and video presentation when splicing transport streams

  • US 6,181,383 B1
  • Filed: 05/28/1997
  • Issued: 01/30/2001
  • Est. Priority Date: 05/29/1996
  • Status: Expired due to Term
First Claim
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1. A method for preserving lip sync during a splicing operation where a plurality of data streams is multiplexed into an output stream, where each of the data streams contains an audio stream having a plurality of audio access units and a video stream having a plurality of video access units that are in lip sync, said method comprising the steps of:

  • (a) splicing a portion of a first data stream into the output stream;

    (b) splicing a portion of a second data stream into the output stream;

    (c) determining at a splice point whether an overlap condition exists between a last audio access unit from said first data stream and a first audio access unit from said second data stream; and

    (d) deleting either said last audio access unit or said first audio access unit if an overlap condition exists.

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