Patent ID: 7379659
Filing Date: 2008-05-27
Classification: H04N

Abstract:
1. A playback apparatus for converting an audio signal and a video signal recorded on an information recording medium as packetized elementary stream packets into a transport stream, comprising: reading means for reading the packetized elementary stream packets from said information recording medium; initializing means for initializing a system time clock by using one of a decoding time stamp and a presentation time stamp included in a header of each of the packetized elementary stream packets; first generation means for generating a program clock reference packet by using a value of the system time clock which is read at predetermined intervals; and conversion means for converting the packetized elementary stream packets into transport stream packets while synchronizing a time obtained by delaying the system time clock by a predetermined period with a time indicating the decoding time stamp or the presentation time stamp included in the header of each of the packetized elementary stream packets, wherein the conversion means reads the decoding time stamp from the header of an I picture and also reads vbv_delay from the header and calculates DTS-(vbv_delay), wherein the conversion means then subtracts a predetermined period from DTS-(vbv_delay) initializing the system time clock and starting a system time clock counter; wherein said conversion means converts the packetized elementary stream packets of the video signal into the transport stream packets at a fixed rate, and intermittently outputs the transport stream packets.