Reproduction device and reproduction method, and file generation device and file generation method

A reproduction method comprising:

• an acquisition step of acquiring, by a reproduction device, an audio stream encoded by a lossless compression technique before a video stream corresponding to the audio stream and detecting a bit rate of the audio stream;
• and
• a selection step of selecting, by the reproduction device, the video stream to be acquired from a plurality of the video streams having different bit rates, on the basis of the bit rate detected by a process of the acquisition step.

A file generation device comprising a file generation unit that generates a management file that manages an audio stream encoded by a lossless compression technique and a video stream corresponding to the audio stream, the management file including information indicating that an encoding technique for the audio stream is not a technique that ensures underflow or overflow not to be produced in a fixed-size buffer during encoding.

A file generation method comprising a file generation step of generating, by a file generation device, a management file that manages an audio stream encoded by a lossless compression technique and a video stream corresponding to the audio stream, the management file including information indicating that an encoding technique for the audio stream is not a technique that ensures underflow or overflow not to be produced in a fixed-size buffer during encoding.