CODING SYSTEM AND ITS METHOD, CODING DEVICE AND ITS METHOD, DECODING DEVICE AND ITS METHOD, RECORDING DEVICE AND ITS METHOD, AND REPRODUCING DEVICE AND ITS METHOD

摘要

A transcoder for creating a re-coded stream including different GOPs (Groups of Pictures) structure and bit rates by re-coding a coded stream created according to the MPEG standards. Specifically, a decoding device of the transcoder creates decoded video data by decoding a source coded stream, extracts the past encoding parameters superposed in the coded stream. A coding device receives the decoded video data and the past encoding parameters and encodes the decoded video data by using the past encoding parameters. The coding device selects the encoding parameter most suitable for the application at the succeeding stage from among the past encoding parameters, and describes it in the coded stream.