Information recording medium wherein stream convertible at high-speed is recorded, and recording apparatus and recording method therefor
View Patent ↗An information recording medium wherein a stream, which is recorded in a control format allowing format conversion from a first format (MPEG-TS) to a second format (MPEG-PS) and is seamlessly connected, can be converted into a second stream, and an apparatus and a method for recording information in the information recording medium. The control format is provided for converting the first format (for instance, MPEG transport stream) into the second format (for instance, MPEG program stream). According to the control format, a system stream just after a seamless connection point starts from a head of a prescribed data control unit (Capsule) specified by the control format.
1. A non-transitory computer readable recording medium for storing video information and audio information encoded into a system stream together with associated management information, wherein
the system stream has at least one of a first format (TS) and a second format (PS), the first format (TS) having a packet structure for storing data segmented in packets, the second format (PS) having a pack structure for storing data segmented in packs,
the first format (TS) includes a constrained format used for converting the system stream from the first format (TS) to the second format (PS),
according to the constrained format, a predetermined number of packets are grouped and managed as a multiplexing unit which corresponds to the pack of the second format, and the system stream is managed in a data management unit (Capsule) which includes a plurality of multiplexing units,
the management information contains playback sequence information (PGC) indicating a playback sequence of the system stream,
the playback sequence information is described by a combination of playback portions (Cells) corresponding to one or a plurality of continuous system streams;
the management information contains connection information (connection_code) for each playback portion, the connection information indicating whether each playback portion is played back seamlessly from the playback portion in the previous playback sequence,
according to the constrained format, the system stream immediately after a seamless connection point is recorded to start from the beginning of a data management unit (Capsule), when the connection information of the playback portion indicates a seamless playback.
2. The information recording medium according to claim 1 , wherein the system stream immediately after a seamless connection point starts with a tip packet.
3. An information recording apparatus for encoding audio information and video information into a system stream and recording the system stream with associated management information to an information recording medium, wherein
the system stream is allowed to have a first format (TS) and a second format (PS), the first format (TS) having a packet structure for storing data segmented in packets, the second format (PS) having a pack structure for storing data segmented in packs,
the first format (TS) is allowed to have a constrained format used for converting the system stream from the first format (TS) to the second format (PS),
according to the constrained format, a predetermined number of packets are grouped and managed as a multiplexing unit which corresponds to the pack of the second format, and the system stream is managed in a data management unit (Capsule) which includes a plurality of multiplexing units,
the management information contains playback sequence information (PGC) indicating a playback sequence of the system stream,
the playback sequence information is described by a combination of playback portions (Cells) corresponding to one or a plurality of continuous system streams,
the management information contains connection information (connection_code) for each playback portion, the connection information indicating whether each playback portion is played back seamlessly from the playback portion in the previous playback sequence,
the information recording apparatus comprises:
a first encoding section that applies a specific encoding process to the video information and audio information to generate a video elementary stream and an audio elementary stream based on the first format (TS);
a second encoding section that applies system-encoding to multiplex the video elementary stream and the audio elementary stream into a system stream based on the first format (TS); and
a controller that controls the first and second encoding sections, and
the controller controls the first and second encoding sections so that the system stream immediately after a seamless connection point starts from the beginning of the data management unit (Capsule), when the connection information of the playback portion indicates a seamless playback.
4. The information recording apparatus according to claim 3 , wherein the system stream immediately after a seamless connection point starts with a tip packet.
5. A method for encoding audio information and video information into a system stream and recording the system stream with associated management information to an information recording medium, wherein
the system stream is allowed to have a first format (TS) and a second format (PS), the first format (TS) having a packet structure for storing data segmented in packets, the second format (PS) having a pack structure for storing data segmented in packs,
the first format (TS) is allowed to have a constrained format used for converting the system stream from the first format (TS) to the second format (PS),
according to the constrained format, a predetermined number of packets are grouped and managed as a multiplexing unit which corresponds to the pack of the second format, and the system stream is managed in a data management unit (Capsule) which includes a plurality of multiplexing units,
the management information contains playback sequence information (PGC) indicating a playback sequence of the system stream,
the playback sequence information is described by a combination of playback portions (Cells) corresponding to one or a plurality of continuous system streams,
the management information contains connection information (connection_code) for each playback portion, the connection information indicating whether each playback portion is played back seamlessly from the playback portion in the previous playback sequence,
when the connection information indicates seamless playback, a third system stream (Bridge-VOB) including a part of each of the two seamlessly connected system streams is used to enable seamless playback,
the information recording method comprises:
applying a specific encoding process to the video information and audio information to generate a video elementary stream and an audio elementary stream based on the first format (TS), and
multiplexing and system encoding the video elementary stream and audio elementary stream based on the first format (TS) to generate the system stream, and
wherein the encoding process encodes so that the system stream immediately after a seamless connection point starts from the beginning of the data management unit (Capsule), when the connection information of the playback portion indicates a seamless playback.
6. The information recording method according to claim 5 , wherein the system stream immediately after a seamless connection point starts with a tip packet.