Patent ID: 8655145
Filing Date: 2014-02-18
Classification: G11B

Abstract:
1. A playback apparatus for playing back a video stream in accordance with reproduction section information constituting playlist information, and mixing and playing back a primary audio stream and a secondary audio stream, a piece of reproduction section information including a stream number table and an in-time and an out-time on a time axis of the video stream, the stream number table including a plurality of entries, the plurality of entries including one or more entries for one or more secondary audio streams permitted to be played back in a reproduction section corresponding to the piece of production section information, the playback apparatus comprising: a first stream number register storing an stream number of a current primary audio stream; a second stream number register storing an stream number of a current secondary audio stream; and a procedure executing unit operable to, if a current reproduction section changes, execute a predetermined procedure to perform a judgment on whether or not (i) the stream number of the current secondary audio stream stored in the second stream number register is equal to or smaller than the number of entries for secondary audio streams written in a stream number table corresponding to the current reproduction section, and (ii) the stream number of the current secondary audio stream stored in the second stream number register satisfies a first condition, and determine whether or not to maintain the current secondary audio stream stored in the second stream number register depending on a result of the judgment, the first condition being that mixing an audio output of the current secondary audio stream with an audio output of the current primary audio stream is permitted by mixing information in a stream number table in a piece of production section information corresponding to the current reproduction section.