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Apparatus for converting moving picture stream of MPEG1 to transport stream of MPEG2

  • US 5,801,781 A
  • Filed: 06/19/1996
  • Issued: 09/01/1998
  • Est. Priority Date: 11/14/1995
  • Status: Expired due to Term
First Claim
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1. A moving picture stream converting apparatus to convert an MPEG1 system stream, that includes a stream of encoded video data and a stream of encoded audio data, to a transport stream of MPEG2, the apparatus comprising:

  • a demultiplexer for receiving the MPEG1 system stream and for separating the streams of encoded video and audio data to form a separate elementary video stream and a separate elementary audio stream, the MPEG1 system stream having a plurality of packs, one of the plurality of packs having a packet header, and each of the plurality of packs having a corresponding system header and a corresponding plurality of packets, each of the plurality of packets having an elementary stream payload to store video or audio encoded data, and an elementary stream header having a packet start code, a stream ID, a packet length corresponding to the elementary stream payload, and time management information;

    a packetizer for forming a corresponding MPEG2 elementary stream packet for each of the separate video and audio elementary streams separated by said demultiplexer, each MPEG2 elementary stream packet having a packetized elementary stream payload to store video or audio encoded data, and a packetized elementary stream header having a packet start code, a stream ID, a packet length corresponding to the packetized elementary stream payload, and time management information; and

    a multiplexer for dividing said packetized elementary streams and storing the divided packetized elementary streams into transport packets having a corresponding prefixed length, and for multiplexing the transport packets and converting the packetized elementary streams to the transport stream of MPEG2, wherein the packetizer receives the separated MPEG1 system streams, analyzes the elementary stream header, and extracts and stores the stream ID, packet length, and time management information in the MPEG2 packetized stream header, and data of said elementary stream payload is stored in the MPEG2 packetized elementary stream payload.

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