Patent ID: 8571390

Claim:
A non-transitory computer-readable recording medium for recording playlist information which when read and executed by a computer, causes the computer to perform operations, comprising: main path information that specifies, as a main stream, one of a plurality of digital streams, and defining a main playback section in the main stream; and sub path information that specifies, as a sub stream, another one of the plurality of digital streams, and defines a sub playback section in the sub stream, the sub playback section being to be synchronized with the main playback section, the sub stream being recorded in the recording medium; and a video stream and a primary audio stream multiplexed in the main stream; wherein the sub stream includes a secondary audio stream which includes metadata that defines a coefficient matrix that is to be included in a sound mixing application, and further wherein the coefficient matrix defines conversion coefficients for respective channels for audio outputs of the primary audio stream, each of the conversion coefficients being used when a conversion process for soundmixing is performed for each of the channels.