Patent ID: 8326116
Filing Date: 2012-12-04
Classification: G11B,H04N

Abstract:
1. A playback device for reading stream management information from a recording medium, and playing back, based on the stream management information, a video stream recorded on the recording medium, wherein the video stream is in an MPEG4-AVC format and is recorded in a form of TS packets having a fixed length, each picture data piece in the video stream has a variable code length and has been converted into an access unit, the access unit having a plurality of Network Abstraction Layer (NAL) units, among the plurality of NAL units, a first NAL unit includes an access unit delimiter, among the TS packets, a TS packet including an access unit delimiter does not include an end portion of a picture data piece that is immediately before the TS packet in the video stream, the stream management information is unique to the video stream, is associated with the video stream by being given a same identification number as a stream file containing the video stream, and includes an entry map and a flag indicating one of application types, the application types including a Movie application and a SlideShow application; the entry map indicates entry addresses of pieces of picture data contained in the video stream, in correspondence with playback start times thereof, the entry address of each picture data piece in the entry map is indicated by a packet number of a source packet that stores the corresponding access unit delimiter, the flag shows whether or not the entry map indicates entry addresses of all the pieces of picture data contained in the video stream, and when the flag indicates the SlideShow application, all pictures constituting the slideshow in the video stream are encoded as IDR pictures, the playback device comprises: a read unit operable to read, from the recording medium, the pieces of picture data contained in the video stream recorded on the recording medium; a playback unit operable to play back a video by decoding each piece of picture data contained in the video stream; and a control unit operable, if the flag indicates that the entry map indicates the entry addresses of all the pieces of picture data contained in the video stream, to control the read unit and the playback unit to start playback or change a start position of the playback, based on a designation of a playback start time, with reference to the entry map.