A continuous stream of formatted digital data, such as a video segment, audio segment, or information stream, appears to be a fixed length segment under certain circumstances, defining a virtual segment within the continuous stream which moves forward in time in synchrony with the continuous stream....http://www.google.com.tw/patents/US6327418?utm_source=gb-gplus-share專利 US6327418 - Method and apparatus implementing random access and time-based functions on a continuous stream of formatted digital data
