Recording medium, reproducing apparatus, and reproducing method
AssigneeMitsubishi Electric Corporation
InventorsMasaaki Shimada, Tomoaki Ryu, Kazuhiko Nakane
Life of this patent
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Abstract
In a recording medium on which is recorded a multiplexed stream (231) including a plurality of first packets (V_main) constituting a first I-picture in a first video stream and a plurality of second packets (V_sub) constituting a second I-picture in a second video stream, information for identifying the first I-picture and information for identifying the second I-picture are recorded on the medium. A recording medium can thereby be obtained that enables the rapid detection, from a small amount of information, of a particular picture included in a stream such as a TS in which multiple content streams are multiplexed.
Claims6
A playback method for reproducing a video information stream recorded on a medium, said video information stream comprising a plurality of video information units each of which includes an intra coded I-picture, a predictive coded P-picture and a bidirectionally-predictive coded B-picture, said video information stream including a first video information stream representing a primary video sequence, a second video information stream representing secondary video sequence which is presented with said primary video sequence and an access point map which includes access point information and I-picture size information of said first video information stream and said second video information stream;
- said method comprising steps of:
- identifying a closest one of I-pictures preceding a start picture corresponding to a start point of playback for said first video information stream and a second video information stream;
- locating a position of identified I-picture for said first video information stream and said second video information stream by referring to said access point map;
- and
- decoding said identified I-picture for said first video information stream and said second video information stream;
- wherein in a case of performing trick play, positions of I-pictures used for trick play, which are selected in accordance with a playback speed, are derived by referring to said access point map.
A playback device for reproducing a video information stream recorded on a medium, said video information stream comprising a plurality of video information units each of which includes an intra coded I-picture, a predictive coded P-picture and a bidirectionally-predictive coded B-picture, said video information stream including a first video information stream representing a primary video sequence, a second video information stream representing secondary video sequence which is presented with said primary video sequence and an access point map which includes access point information and I-picture size information of said first video information stream and said second video information stream;
- said device comprising steps of:
- an I-picture identifying unit for identifying a closest one of I-pictures preceding a start picture corresponding to a start point of playback for said first video information stream and a second video information stream;
- an I-picture position locating unit for locating a position of identified I-picture for said first video information stream and said second video information stream by referring to said access point map;
- and
- a decoding unit for decoding said identified I-picture for said first video information stream and said second video information stream;
- wherein in a case of performing trick play, said I-picture position locating unit derives positions of I-pictures used for trick play, which are selected in accordance with a playback speed by referring to said access point map, and said decoding unit decodes selected I-pictures.
Dependencies are inferred from the claim text.