Method and system for re-multiplexing of content-modified MPEG-2 transport streams using interpolation of packet arrival times
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United States of America Patent
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Jun 5, 2007
Grant Date -
Feb 17, 2005
app pub date -
Aug 13, 2003
filing date -
Aug 13, 2003
priority date (Note) -
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Abstract
A system and method is provided for revising the time stamp information in an MPEG-2 encoded data transport stream after content in the transport stream is modified. Incoming packets are stamped with arrival times and packet sequence counts. Synchronization points within the elementary stream are identified and arrival times for those synchronization points are calculated. After elementary streams are modified, commensurate arrival times are calculated based on arrival times and packet sequence counts of incoming packets, as well as the arrival times of the identified synchronization points within the elementary stream and the bit ratio between the incoming packets and the modified outgoing packets. Calculated arrival times are stamped on the outgoing packets and used to time the output of the outgoing stream.
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