Method and apparatus for synchronizing data streams containing audio, video and/or other data

摘要

Several data streams contain video, audio and/or other data. Some of the data streams are pre-recorded in a multiplex on a storage medium while other data streams are located out of the data stream multiplex on the storage medium. The data streams are synchronized using a navigation file (List_of_PlayItems), which comprises descriptors (PlayItems, SubPlayItems) pointing to parts of said data streams, wherein said descriptors define the arrangement in time for said data streams by means of data sub stream paths.

主权项

1. A method for playback of data streams from a non-transitory storage medium, said data streams containing video, audio and/or other data, the method comprising:
retrieving a basic stream path of consecutive descriptors pointing to parts of a basic AV MPEG-2 transport stream of multiplexed elementary streams, wherein said descriptors define the arrangement in time for playing back said parts of said basic AV MPEG-2 transport stream; retrieving one or more sub stream paths of consecutive descriptors existing in parallel to said basic stream path, said one or more sub stream paths of consecutive descriptors pointing to data streams or parts of data streams, wherein at least one of said one or more sub stream paths of consecutive descriptors points to a transport stream or a part of a transport stream of multiplexed elementary streams located out of said basic AV MPEG-2 transport stream; retrieving indications on the stream path type of each of said one or more sub stream paths of consecutive descriptors; and decoding said parts of said basic AV MPEG-2 transport stream of multiplexed elementary streams and said transport stream or said part of said transport stream of multiplexed elementary streams located out of said basic AV MPEG-2 transport stream as defined by said basic stream path of consecutive descriptors and said at least one of said one or more sub stream paths of consecutive descriptors, wherein said descriptors of said one or more sub stream paths of consecutive descriptors point at said basic AV MPEG-2 transport stream, thus said descriptors allowing to locate the part of said basic AV MPEG-2 transport stream to which the corresponding sub stream path is bound, and to bind the corresponding sub stream path to the located part of said basic AV MPEG-2 transport stream, wherein said transport stream or said part of said transport stream of multiplexed elementary streams located out of said basic AV MPEG-2 transport stream comprises a Seamless presentation flag indicating that synchronisation concerning seamless switching between parts of said basic MPEG-2 transport stream and said transport stream or said part of said transport stream of multiplexed elementary streams located out of said basic AV MPEG-2 transport stream during playback is supported.