Embedded ancillary data processing method and system with program duration alteration

摘要

The total running time of an original program signal, with related embedded ancillary data is altered to generate a time-shortened (or time-lengthened) program signal. The video signal embedded ancillary data packets are subject to separate processing without decoding payload text strings and caption information. The video portion of the original program signal is processed by deleting (or adding) individual frames on a manual, periodic or automatic basis. As fields or frames are removed (or added), corresponding ancillary data packets and text-based payload information are temporarily stored and analyzed such that data can be reassembled within the time-altered video program. Embedded circuitry determines the type of caption and subtitle information (HD/SD) and location within the Vertical Ancillary (VANC) and Horizontal Ancillary (HANC) packets for processing coupled with the original video signal. All captions, subtitles and text-based information associated with the original program signal are preserved and caption information is automatically aligned to the time-altered video signal.