Patent ID: 8275234

Claim:
A playback apparatus for performing Picture in Picture playback using primary video streams and secondary video streams in accordance with play list information, wherein the play list information includes main-path information and sub-path information, the main-path information defines playback sections for the primary video streams and includes start point information and end point information, the start point information indicating a start point of each of the playback sections of the primary video streams, the end point information indicating an end point of each of the playback sections of the primary video streams, the sub-path information defines playback sections for the secondary video streams and includes start point information and end point information, the start point information indicating a start point of each of the playback sections of the secondary video streams, the end point information indicating an end point of each of the playback sections of the secondary video streams, when at least two secondary video streams overlap in one of the playback sections of the primary video streams, the playback apparatus provides a time gap between an end point of a playback section of one of the at least two secondary video streams and a start point of a playback section of another one of the at least two secondary video streams that immediately follows the one of the at least two secondary video streams, the playback apparatus comprises: a reading unit operable to read out the primary video streams and the secondary video streams; and a playback unit operable to realize Picture in Picture by composing pictures represented by the secondary video streams with pictures represented by the primary video streams, and the playback apparatus does not perform seamless playback during the time gap.