Encoding apparatus, an encoding method, a decoding apparatus, a decoding method and a program

The present invention relates to an encoding apparatus, an encoding method, a decoding apparatus, a decoding method and a program. An encoding apparatus, comprising: a generating unit configured to generate first encoded information encoded first audio signal a first and a second for the second encoded information encoded second audio signal, and generates a fourth encoding the first encoded information in the third audio signal encoded second information and the third for the second encoded audio signal; a first encoding unit configured to generate a first and second data; a second encoding unit is configured to perform a third audio signal to generate a second encoded third data and fourth data; and a multiplexing unit configured to generate a second audio signal stream and the first audio signal stream. The event of loss or errors in the stream of the second audio signal, the decoding of the third data instead of the second data.