Encoding parameters of picture and higher layers of importance to a number of applications, and encoding parameters of slice and lower layers of no importance to all applications are converted into auxiliary packets inserted respectively into a V-blanking area and an H-blanking area of a video-data signal output by a history-information-multiplexing apparatus employed in a video-decoding system. Each of the at least two audio streams is a packetized version of an audio source. The sublatches are operable to receive a data signal at their respective input circuitry and to generate output signals on their respective output nodes. The upper magnetic pole layer is formed on the gap layers by plating. The device is subjected to oxidizing conditions, which form oxidized sidewalls on the gate structure.