DECODING DEVICE, METHOD THEREFOR AND PROVIDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To make a scale of transcoder small and to suppress the deterioration of images cauged by re-encoding. SOLUTION: An encoding parameter multiplex device 103 multiplexes a present encoding parameter and an encoding parameter of plural generations included in history information, which is supplied by a history encoder 104 into video data supplied bay a decoder 102 and outputs it as a digital video signal of a base band to an encoding parameter separation device 105. The encoding parameter separation device 105 selects the encoding parameter to be used for encoding by an encoder 106, outputs it as the present encoding parameter to the encoder 106, and outputs the remaining encoding parameter of plural generations to a history encoder 107. The encoder 106 encodes the video data supplied by the encoding parameter separation device 105 by the present encoding parameter and generates a bit stream; at the same time, it multiplexes use data where the encoding parameter of the plural generations supplied by the history encoder 107 to the bit stream is included as history information, and outputs them to a successive step transcoder.