Optical disc, optical disc recording apparatus, and optical recording method for facilitating dubbing, storage medium for storing optical disc recording a program for facilitating dubbing, optical disc reproducing apparatus, and optical disc reproducing method

A encode apparatus for encoding an input video signal and an input audio signal into a video object, comprising:

• a video stream generator operable to generate a video stream by encoding the video signal;
• an audio stream generator operable to generate a first audio stream by encoding the audio signal, and to generate a second audio stream for dubbing based on the generated first audio stream;
• a multiplexer operable to multiplex the generated video stream, first audio stream, and second audio stream to generate a video object;
• a controller operable to control the video stream generator, the audio stream generator, the multiplexer wherein
• the audio stream generator is operable to generate the first audio stream to include a plurality of packs having a fixed size, and to generate the second audio stream by using audio data contained in the packs of the first audio stream so that the second audio stream has the same bit rate as the first audio stream and includes the same number of packs as the first audio stream, each pack of the second audio stream having the same size as the first audio stream,
• each pack of the first and second audio streams has identification information for identifying which one of the first and second audio streams includes said each pack,
• the audio stream generator includes a first buffer for storing the packs of the first audio stream and a second buffer for storing the packs of the second audio stream.