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METHOD AND SYSTEM FOR COMMUNICATING H.263 MACROBLOCK BOUNDARIES USING H.221 BAS FOR RFC2190-COMPLIANT FRAGMENTATION

  • US 20080240123A1
  • Filed: 03/27/2007
  • Published: 10/02/2008
  • Est. Priority Date: 03/27/2007
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving a Real-Time Transport Protocol (RTP) packet at a first gateway, the RTP packet including a H.263-compressed video bitstream;

    searching for a Picture Start code (PSC) or a Group of Block start code (GBSC) at a start portion of the RTP packet;

    translating the RTP packet into a H.221 frame;

    transmitting the H.221 frame containing the H.263-compressed video bitstream to a second gateway;

    fragmenting the H.263-compressed video bitstream in the second gateway according to RFC2190; and

    including in the H.221 frame a H.221 Bit-Rate Allocation Signal (BAS) fragmentation message containing a Macroblock (MB) boundary, if the first gateway cannot locate the PSC or the GBSC at the start portion of the RTP packet.

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