DECODER AND DECODING METHOD, RE-ENCODER AND RE-ENCODING METHOD, INFORMATION RECORDING MEDIUM, AND DECODING PROGRAM AND RE-ENCODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a decoder or the like that can minimize deterioration in the quality of a moving picture or the like as the quality of information even when coding information obtained by coding the moving picture or the like is decoded and re-encoded repetitively. SOLUTION: A set-top box is provided with a superposition section 4 that embeds identification information denoting that a still picture is obtained by decoding an I picture included in a GOP configuring coded information to the still picture so as to generate decoded information in decoding coded information coded by the MPEG system to generate the decoded information. Then in re- encoding, the identification information is detected from the generated decoded information and the decoded information is re-encoded based on the still picture in which the identification information is included.