Code conversion method and device thereof

摘要

In order to cope with format conversion of user data, the bit rate value and VBV (Video Buffering Verifier) buffer size value in a sequence header of an input code and the VBV delay value in a picture header of the input code are modified to obtain an intermediate code ( 305 to 309 ), and additional information ( 300 ) is generated for distinguishing GOP (Group of Pictures) user data ( 307 ) from the other main data. A VBV buffer simulation is performed using this additional information ( 300 ) to multiplex the GOP user data in a picture user data region to a data amount such that the operation does not fail, whereby an output code is generated.