Method and system for re-multiplexing of content-modified MPEG-2 transport streams using PCR interpolation

摘要

A system and method is provided for revising the time stamp information in an MPEG-2 transport stream after content in the transport stream is modified. According to one method, successive PCR time stamps previously added to the transport stream are used to determine PCRSYNC time stamps for synchronization points in the transport stream by interpolation. The PCRSYNC time stamps are substituted into transport packets within the transport stream. The PCRSYNC is also used to determine modified time of arrival (TOA) stamps to be added to transport packets. According to a second method, PCR interpolation is used to determine the values of PCRSYNC. TOA interpolation of TOA stamps previously added to the transport stream are used to determine modified TOA stamps to be substituted into the transport stream for the previously added TOA stamps.