KR20080036126A - Recording medium, method and apparatus for reproducing data and method and apparatus for recording data - Google Patents

Abstract

A recording medium, a method and an apparatus for reproducing data, and a method and an apparatus for recording data are provided to reproduce a primary video and a secondary video simultaneously, thereby allowing a content provider to provide users with more various contents. A recording medium having a data structure of managing reproduction of at least one picture-in-picture presentation path comprises a data area, and a management area. The data area stores a primary video stream representing a primary presentation path, and a secondary video stream representing a picture-in-picture presentation path regarding the primary presentation path. The management area, which includes composition information including information indicating the location at which the secondary video stream is displayed, stores management information for managing reproduction of the picture-in-picture presentation path.

Description

Recording medium, data reproducing method and reproducing apparatus and data recording method and recording apparatus

The present invention relates to a recording medium and a recording and reproducing method and apparatus.

As a recording medium, an optical disk capable of recording a large amount of data is widely used. Most recently, new high-density recording media, such as Blu-ray Discs (BDs) and high-density digital video discs (HD-DVDs), can record and store high-quality video data and high-quality audio data for a long time. High Definition Digital Versatile Disc) and the like are being developed.

High-density recording media, the next-generation recording media technology, are next-generation optical recording solutions that can contain data that significantly surpasses existing DVDs. In addition, development of an optical recording / reproducing apparatus using a high density recording medium standard has also begun.

In relation to this, with the development of a high density recording medium and an optical recording / reproducing apparatus, it is possible to simultaneously play two videos. However, there is no known method of playing two videos together, and since the specification of the high density recording medium is not fully completed, it is difficult to develop a full optical recording / reproducing device based on the high density recording medium. It is true.

The accompanying drawings are included to provide a further understanding of the present invention, and together make and combine some of this application and embodiments of the invention with the description provided to explain the principles of the invention.

1 is a diagram illustrating an embodiment of reproducing data in a storage medium and / or storage through an optical recording / reproducing apparatus.

Fig. 2 shows a file structure recorded on an optical disc as a recording medium of the present invention.

3 shows a recording structure of an optical disc as a recording medium of the present invention.

4 is shown to help conceptual understanding of the second video of the present invention.

Fig. 5 shows the overall configuration of the optical recording / reproducing apparatus of the present invention.

6 schematically illustrates one embodiment of a playback system of the present invention.

7 shows a data reproducing apparatus utilizing the playback system of the present invention.

8 shows an embodiment of a state memory unit provided in the optical reproducing / recording apparatus of the present invention.

9 illustrates an embodiment of management data according to the present invention.

10A to 10C illustrate the conceptual understanding of the timeline type of the present invention.

11 illustrates an embodiment of second video location information of the present invention.

12 illustrates one embodiment of a table including information about a second video stream of the present invention.

13 shows an embodiment of a data reproduction method according to the present invention.

The present invention relates to a recording medium having a data structure for managing reproduction of at least one picture-in-picture presentation path.

In one embodiment, a first video stream representing a first presentation path and a second video stream representing a picture-in-picture presentation path relating to the first presentation path ( secondary video stream). And a management area for storing management information for managing reproduction of the picture-in-picture presentation path. The management information includes composition information including position information indicating a position to display the second video stream.

For example, the position information may include vertical position information indicating a vertical position at which a top left pixel of the second video stream is to be displayed on a display of the first video stream. As another example, the position information may include horizontal position information indicating a horizontal position at which the top left pixel of the second video stream is to be displayed on a display of the first video stream. In addition, the configuration information may include scale information indicating a size to display the second video stream.

In another embodiment, the management information includes timing information indicating the start of a section in which the configuration information is valid.

In another embodiment, the management information may include picture-in-picture timeline information. The picture-in-picture timeline information indicates whether the timing information refers to one of a timeline of a play item and a timeline of a sub path. The play item indicates a playback section of the first video stream, and the sub path indicates a playback section of the second video stream.

In another embodiment, a first video stream representing a first presentation pass and a second video stream representing a picture-in-picture presentation pass relating to the first presentation pass. (secondary video stream) is stored in the data area. And a management area for storing management information for managing reproduction of the picture-in-picture presentation path. The management information includes composition information including scale information indicating a size at which to display the second video stream.

The present invention also relates to a method and apparatus for recording picture-in-picture video data on a recording medium, and to a method and apparatus for reproducing picture-in-picture video data from a recording medium.

Preferred embodiments of the invention will be described in detail below, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Hereinafter, the present invention will be described by using an optical disc, especially a "Blu-ray Disc (BD)" as a recording medium for convenience of explanation, but the technical concept of the present invention is the same for other recording media such as HD-DVD. Applicability should be obvious.

In the present invention, "storage" is a kind of storage means provided in the optical recording / reproducing apparatus (Fig. 1), and means an element that a user can arbitrarily store and utilize necessary information and data. That is, the storage currently used generally may be a "hard disk", "system memory (system memory)", "flash memory" and the like, but the present invention is not necessarily limited thereto. no.

In the context of the present invention, the term "storage" is also used as a means for storing data associated with a record carrier (e.g. a Blu-ray disc) and the data stored in the storage associated with the record carrier is stored externally. The data downloaded from it is common.

It is apparent that some permitted data may be read directly from the recording medium, or system data (eg, metadata, etc.) related to recording and reproduction of the recording medium may be generated and stored in the storage.

In the present invention, for convenience of description, the data recorded in the recording medium is referred to as "orIginal data", and the data related to the recording medium among the data stored in the storage is referred to as "additional data". I want to name

In the present invention, the term "title" refers to a reproduction unit that forms an interface with a user. Each title is linked with a specific object, and a stream related to the title recorded in the disc is reproduced according to a command or a program in the object. In particular, in the present invention, for the convenience of description, seamless multi-angle and multi-story, language credit, director among titles including video data by MPEG2 compression method. Titles that support features such as director's cuts, trilogy collections, etc. will be specifically termed "HDMV Titles". In addition, among titles containing video data by MPEG2 compression, a programmable application environment is provided along with connectivity to a network to allow a content provider to implement high interactivity. We will call it "BD-J title".

1 is a diagram illustrating an embodiment of reproducing data in a storage medium and / or storage through an optical recording / reproducing apparatus.

In relation to this, the "optical recording / reproducing apparatus 10" of the present invention is a device capable of recording or reproducing optical discs of various standards. Depending on the design, only an optical disc of a specific standard (e.g., BD) can be recorded / playable. It would also be possible to play back without recording. However, in consideration of the linkage between the Blu-ray Disc (BD) and the peripheral device to be solved in the present invention, hereinafter, a player (BD-player) or Blu-ray Disc (BD) for playing the Blu-ray Disc (BD) is recorded / A recorder (BD-recorder) to be played back will be described as an example. In this regard, it is well known that the " optical recording / reproducing device 10 " of the present invention can be a " drive " that can be embedded in a computer or the like.

In addition to the function of recording / reproducing the optical disc 30, the optical recording / reproducing apparatus 10 of the present invention receives an external input signal, processes the received signal, and then displays the image on the external display 20. It has the function of delivering in a form that can be. There is no particular limitation on the inputtable external signal, but digital multimedia broadcasting and the Internet will be representative external input signals. In particular, in the case of the Internet, anyone can easily access and download specific data on the Internet through the optical recording / reproducing apparatus 10.

In relation to this, a person providing content as an external input source is collectively referred to as a "content provider (CP)".

In the present invention, content refers to data provided by an author of a recording medium as content constituting a title.

The original data and the local data will be described in detail as follows. For example, a multiplexed AV stream for a particular title is recorded on the optical disc as original data, and the local data on the Internet is different from the audio stream of the original data (e.g. English audio stream). Assume that there is an audio stream (eg, Korean audio stream). In this case, some users may need to download an audio stream (eg, a Korean audio stream) that is an international data on the Internet, and play the audio stream together with the original data, or play the audio only. . Therefore, in order to realize such a demand, there is a need for a systematic method of defining the association between the original data and the local data and managing and reproducing the data according to the user's request. The present invention seeks to provide a method for implementing the structured method.

For convenience of explanation, the signals recorded in the disk are referred to as original data, and signals existing outside the disk are referred to as local data. However, this depends only on the method of acquiring the respective data, and the original data and the positional data are not necessarily limited to the specific data. Thus, data of any attribute existing outside the optical disk and associated with the original data is possible as the local data.

In order to realize the needs of the user, it is essential to have a file structure associated with the original data and the locational data. Hereinafter, a file structure and a data recording structure usable in a Blu-ray disc BD will be described in detail with reference to FIGS. 2 to 3.

2 shows a file structure for reproducing and managing original data recorded in a disc.

The file structure of the present invention includes at least one BDMV directory (BDMV) under one root directory. The BDMV directory (BDMV) is a general file (parent file) information for ensuring interactivity with a user and includes an index file ("index") and an object file ("movieObjet"). In addition, the file structure is a directory having information on the data recorded in the actual disk, a method of reproducing the data, and the like, and includes a playlist directory (PLAYLIST), a clip information directory (CLIPINF), a stream directory (STREAM), and a subsidiary. And a directory AUXDATA, a BD-J object directory BDJO, a metadata directory META, a backup directory BACKUP, and a JAR directory. Hereinafter, the directory and the files included in the directory will be described in detail.

The metadata directory META includes a metadata file that is data about a data. The metadata file may include a search file, a metadata file for a disc library, and the like. The metadata file is used for efficient search or management of data during recording and reproduction of data.

The BD-J object directory (BDJO) includes a BD-J object file for playing a BD-J title.

The auxiliary directory AUXDATA contains additional data files required for disc reproduction. For example, the auxiliary directory AUXDATA may be a "Sound.bdmv" file that provides sound at the time of interactive graphic execution, and "11111.otf which provides font information while the disc is playing. "And" 99999.otf "files and the like.

The stream directory STREAM includes files for an AV stream recorded in a specific format in a disc. Each stream is most commonly recorded as a transport packet of MPEG-2 scheme. "* .M2ts" is used as the extension of the stream file (for example, 01000.m2ts, 02000.m2ts, ...). In particular, a stream in which video / audio / graphic information is multiplexed in the stream is called an AV stream. The title consists of at least one AV stream file.

The clip information directory CLIPINF includes clip information files (01000.clpi, 02000.clpi, ...). The clip information file corresponds one-to-one with each stream file ("* .m2ts"). In particular, the clip information file ("* .clpi") records attribute information, timing information, and the like of the stream file ("* .m2ts") corresponding to the clip information file. In relation to this, a stream file ("* .m2ts") and a clip information file ("* .clpi") corresponding to the stream file ("* .m2ts") one-to-one are collectively called "clip". That is, "clip" means data including both a stream file ("* .m2ts") and a clip information file ("* .clpi").

The playlist directory PLAYLIST includes playlist files ("* .mpls"). A playlist is a combination of playing intervals at which clips are played. The time to be played is referred to as a PlayItem. Each playlist file ("* .mpls") includes at least one playitem and a subplayitem (SubPlayItem). The playitem and subplayitem have information on a play start time (IN-Time) and a play end time (OUT-Time) of a specific clip to be played. Thus, a playlist may be referred to as a combination of playitems.

A process played by the at least one playitem in a playlist file is defined as a "main path", and a process played by each subplayitem is defined as a "sub path". The main pass provides the master presentation of the playlist, and the sub pass provides auxiliary presentations related to the master playback. The playlist file should include the main path, and the sub path includes at least one or more according to the existence of the sub-playitem as necessary. As a result, the playlist file becomes a basic reproduction / management file unit in the entire reproduction / management file structure for performing reproduction of a desired clip by combining at least one playitem.

In connection with the present invention, the video data reproduced by the main pass is called primary video and the video data reproduced by the sub pass is called secondary videon. The function of the optical recording / reproducing apparatus playing back the first video and the second video together is also called " picture-in-picture " (PIP). In the present invention, the types of the subpaths used to reproduce the second video are classified based on the characteristics of the subpaths, and information indicating the classified types of the subpaths is provided. This will be described in detail with reference to FIG. 7.

The backup directory BACKUP may include an index file (“index”), an object file (movie object, BD-J object), and a unit key file in which information related to disc reproduction, among data in the file structure, is recorded. file), a copy of all playlist files ("* .mpls") in the playlist directory (PLAYLIST) and all clipinfo files ("* .clpi") in the clip information directory (CLIPINF). The backup directory BACKUP is provided for separately storing a copy of the files for backup, considering that the files are fatal to disk play upon loss of the files.

In this regard, it will be apparent that the file structure of the present invention is not limited to the names and locations described above. In other words, the directories and files should be understood by their meaning and not by name and location.

3 shows a data recording structure recorded on an optical disc by the present invention. 3 shows a form in which information related to the above-described file structure is recorded in a disc. Referring to Fig. 3, the disc is a file system information area as a system information for managing the entire file from the inner circumference of the disc, and an index file for reproducing the recorded stream (* .m2ts). And a stream area in which an object file, a playlist file, a clip information file, a metadata file is recorded, and a stream or JAR program file composed of audio / video / graphics or the like is recorded.

The disc further includes an area for recording file information and the like for reproducing the content in the stream area. This area is called a management area. The file system information area and database area correspond to the management area.

However, each region of FIG. 3 is provided as an example, and it will be apparent that the present invention is not limited to the arrangement structure of each region as shown in FIG. 3.

In connection with the present invention, stream data of the first video and / or the second video is stored in the stream area. In the present invention, the second video may be multiplexed on the same stream as the first video. Alternatively, the second video may be multiplexed into a stream different from the first video. In the present invention, the type of the subpath used for playing the second video, that is, information indicating the subpath type, is stored in the management area. The sub path type may be classified based on a type of a stream in which the second video is multiplexed. In this regard, information about a timeline type of second video metadata is stored in the management area. The second video metadata is data for managing reproduction of the second video. The timeline type information indicates a timeline in which the metadata is defined. The metadata and the timeline type are described in detail with reference to FIGS. 7 and 11A through 11C.

4 is shown to help conceptual understanding of the second video of the present invention.

It is an object of the present invention to provide a method of playing secondary video data together with primary video. That is, the present invention provides an optical recording / reproducing apparatus capable of enabling the PiP application and efficiently performing the PiP application.

Referring to FIG. 4, there may be a request to output different video data related to the first video 410 to the same display 20 during playback of the first video. For example, during the playback of a movie or documentary, it is possible to provide the user with a director's comment or episode about the shooting process. The video showing the comment or episode becomes the second video 420. The second video 420 may be played together with the first video 410 from the start of playback of the first video 410.

The second video 420 DML playback may begin in the middle of the playback of the first video 410. In addition, depending on the playback process, it is also possible to display the second video on the display in a different position or different size on the screen. The second video 420 may be configured in plural, and playback of the second video 420 may be started or terminated separately from playback of the first video. Of course, the first video can be played with the audio 410a associated with the first video, and the second video can be played with the audio 420b associated with the second video.

In relation to this, in order to play the second video, information on a play time, a play position, a play size, and a stream constituting the second video is provided. In addition, information defining an audio stream played with the second video and a presentation graphics or text subtitle stream (eg PiP PG textST stream) and information defining possible playback combinations of the streams are also provided. In addition, the optical recording / reproducing apparatus may be provided with a memory unit (for example, a PSR) that stores information indicating a reproduction state and a reproduction environment of the second video. The present invention satisfies this need and provides a method for efficiently playing a second video along with the first video. Hereinafter, the present invention will be described in detail with reference to FIG.

Fig. 5 shows one embodiment of the overall configuration of the optical recording / reproducing apparatus 10 of the present invention.

5, the optical recording / reproducing apparatus 10 controls the operation of the pickup 11 and the pickup 11 for reproducing management information including original data and reproduction management file information recorded on the optical disk. Reconstructs the playback signal received from the servo 14 and the pickup 11 to a desired signal value, or modulates the signals to be recorded, for example, the first video and the second video into signals recorded on an optical disc. It basically includes a signal processing unit 13 for transmitting and the microcomputer 16 for controlling the operation. The pickup 11, the servo 14, the signal processor 13, and the microcomputer 16 are sometimes referred to as recording / reproducing units. In the present invention, the recording / reproducing section reads data from the optical disc 30 or the storage 15 under the control of the controller 12 and provides it to the AV decoder 17b. In other words, from the viewpoint of reproduction, the recording / reproducing section functions as a reader unit for reading data. In addition, the recording / reproducing unit may receive a signal encoded by the AV encoder 18 and record video, audio data, and the like on the optical disc 30.

The controller 12 downloads the local data existing in addition to the optical disk by a user command or the like and stores the data in the storage 15, and requests the user to request the local data in the storage 15 and / or the original data in the optical disk. Will be played according to. Further, in the present invention, the controller 12 controls the recording / reproducing section to generate management data of the second video and to record the management data together with the video data on the optical disc 30.

The optical recording / reproducing apparatus 10 further includes a reproducing system 17 which finally decodes the data under the control of the controller 12 and provides it to the user. The reproducing system 17 specifically analyzes the AV decoder 17b for decoding the AV signal, the object command or application relating to the reproduction of the specific title described above, and the user command input through the controller 12 to reproduce the direction of reproduction. The player model 17a for determining. In some embodiments, the player model 17a may be used to include the AV decoder 17a. In this case, the playback system 17 of the present invention becomes the player model.

The AV decoder 17b may include a plurality of decoders. 6 schematically illustrates one embodiment of a playback system of the present invention.

Referring to FIG. 6, the AV decoder 17b of the present invention includes a first video decoder 810a for decoding the first video, and a second video decoder for decoding the second video. 810b. The decoded first video is output through the first video plane 820a and provided to the user, and the decoded second video is output through the second video plane 820b and provided to the user. In particular, the controller 12 identifies the metadata managing the playback of the second video and controls the second video decoder 810b to be displayed at a particular location and size at the particular time in accordance with the metadata. do. The time, location and / or size may be predetermined. The stream data of the first video and / or the second video may be recorded on the recording medium, that is, the optical disc 30, or may be downloaded from the outside of the recording medium and stored in the storage 15.

The AV encoder 18 included in the optical recording / reproducing apparatus 10 shown in FIG. 5 uses an input signal as a signal of a specific format, for example, an MPEG2 transport, to perform a function of recording a signal on an optical disk. The signal is converted into a stream and provided to the signal processor 13.

FIG. 7 shows an embodiment of a data reproducing apparatus utilizing the playback system of the present invention. According to the invention, the playback system is to play the second video and the first video together.

The playback system refers to a collective playback processing means composed of a program (software) and / or hardware provided in the optical recorder / player. In addition to reproducing a recording medium loaded in an optical recording / reproducing apparatus, data stored in storage (for example, downloaded from outside of the recording medium) associated with the recording medium can be reproduced and managed. Means system.

Referring to FIG. 7, in particular, the playback system 17 includes a user event manager 171, a module manager 172, an HDMV module 174, a BD-J module 175, A playback control engine 176, a presentation engine 177, and a virtual file system 40 are described. This configuration will be described in detail below.

As separate playback processing management means for reproducing the HDMV title and the BD-J title, the HDMV module 174 for the HDMV title and the BD-J module 175 for the BD-J title are configured independently. The HDMV module 174 and the BD-J module 175 are configured to receive a command or program in the above-described object (movie object or BD-J object) and to process the received command or program. Each is provided. Each of the HDMV module 174 and the BD-J module 175 may enable portability of the command or application by separating an associated command or application from a hardware configuration of the playback system. . The HDMV module 174 is a means for receiving and processing the command or application, and includes a command processor 174a. The BD-J module 175 includes a Java VM 175a and an application manager 175b as means for receiving and processing the command or application.

The Java VM 175a is a virtual machine on which an application is executed. The application manager 175b includes an application management function for managing a lifecycle of an application processed by the BD-J module 175.

The module manager 172 transmits a user command to the HDMV module 174 and the BD-J module 175 as well as controls operations of the HDMV module 174 and the BD-J module 175. The playback control engine 176 analyzes the playlist file actually recorded on the disc according to the playback commands of the HDMV module 174 and the BD-J module 175, and performs a playback function according to the result of the analysis. The presentation engine 1177 decodes a specific stream whose reproduction is managed by the reproduction control engine 176, and displays the decoded stream in the screen. In particular, the playback control engine 176 includes a playback control function 176a that manages the actual playback, and a player status register (PSR) and a general purpose register (GPR) for storing the playback status of the player. It includes player registers (176b) including. In some cases, the regeneration control function 176a may mean the regeneration control engine 176.

The HDMV module 174 and the BD-J module 175 each receive a user command of a separate method, and the method of performing the user command is independent of each other. In order to receive a user command and deliver it to any one of the HDMV module 174 and the BD-J module 175, a separate delivery means is required. This function is performed by the user event manager 171. Accordingly, if the received command is a user command generated by the user operation (UO) controller 171a, the user event manager 171 may refer to the module manager 172 or the UO controller 171a. To send. On the other hand, if the received command is a user command generated by a key event, the user event manager 171 transmits the received command to the Java VM 175a in the BD-J module 175.

In addition, the playback system 17 of the present invention may include a metadata manager 173. The metadata manager 173 provides a disc library and an enhanced search metadata application to the user.

The module manager 172, the HDMV module 174, the BD-J module 175, and the playback control engine 176 of the playback system of the present invention may be processed in software. Software processing is more useful in design than actual hardware configuration. Of course, the presentation engine 177 and decoder 19 and the plane are generally designed in hardware. In particular, the components that are processed in software (eg, 172, 174, 175, 176) may be configured as part of the controller 12 described above. Therefore, the configuration of the present invention should be understood as the meaning, and is not limited to the hardware configuration or the software configuration. Here, the plane refers to a conceptual model for explaining an overlaid process of the first video, the second video, the presentation graphics (PG), the interactive graphics (IG), and the text subtitle. In the present invention, the second video plane is arranged in front of the first video plane. Thus, the second video output after being decoded is presented on the second video plane.

8 shows an embodiment of a state memory unit provided in the optical recording / reproducing apparatus of the present invention.

The player register 176b included in the optical recording / reproducing apparatus 10 functions as a kind of memory unit in which information about the recording / reproducing state and the recording / reproducing environment of the player is stored. The player register 176b may be divided into general purpose registers (GPRs) and player status registers (PSRs). Each player status register (PSR) may comprise playback status parameters (e.g., 'interactive graphics stream number' 710 and 'primary audio stream number' 720), or the configuration of an optical recording / playback device. Stores (configuration) parameters (eg, 'player capability for video' (770)). In the present invention, since the second video is played in addition to the first video, a PSR for storing the playback state of the second video is required.

The stream number of the second video may be stored in one of the PSRs (eg, PSR14 760). In addition, the stream number of the second audio associated with the second video may be stored in the PSR (hereinafter PSR14). Referring to FIG. 8, as described above, the PSR14 760 that stores the stream numbers of the second video and the second audio is included in the optical recording / reproducing apparatus 10. The second video stream number stored in the PSR14 760 specifies which second video stream should be presented from the second video stream entries in the STN table of the current playitem. It is used to Similarly, a second audio stream number stored in PSR14 760 is used to specify which second audio stream should be presented from the second audio stream entry in the STN table of the current playitem. The STN table related to the present invention will be described in detail with reference to FIG. 12.

The PSR14 760 may include a flag indicating whether the presentation of the second video is enabled or disabled. For example, if the flag is set to enabled, the second video is decoded and presented to the user via the second video plane 820b. Conversely, if the flag is set to disabled, the user cannot see the second video even if the second video is decoded at the decoder 810b. The flag may be changed by a user operation (UO), a command, or an application programming interface (hereinafter, API).

Also, the PSR14 760 may store the size of the second video. For example, when the size of the second video is set to '0 × 0' in the PSR14 760, the presentation of the second video may be adjusted according to the second video scale information, which will be described later in FIG. 9. Can be. On the other hand, when the size of the second video is set to '0 × F' in the PSR14 760, the size of the second video is adjusted to the full screen size regardless of the scale information. In this regard, the second video may be scaled up to the same size as the associated first video.

In connection with the present invention, it is possible for the second video to be played together with the presentation graphics or text subtitle (hereinafter 'PG TextST'). Therefore, a memory unit (for example, PSR2 720) that stores information about 'PG TextST' (hereinafter referred to as PiP PG TextST) for the second video is required. Therefore, when the second video stream is displayed during the current playitem presentation, the 'PiP PG TextST' stream number value in the PSR2 720 indicates that any PG stream or TextST stream is 'PG TextST' in the STN table of the current playitem. Used to specify whether to present in a stream.

On the other hand, when the second video stream is not displayed, that is, when the video presentation flag of the PSR14 is set to disabled or there is no second video stream displayed during the current playitem presentation, the PSR2 720 is displayed. The 'PG TextST' number of is used to specify which PG stream or TextST stream should be presented among the 'PG TextST' streams in the STN table of the current playitem.

The PSR2 720 may include a flag indicating whether the 'PG TextST' including the 'PiP PG TextST' stream can be displayed. That is, when the flag stored in the PSR2 is set to disable, the 'PG TextST' stream is not displayed. On the contrary, if the flag is set to be enabled, the designated 'PG TextST' stream may be displayed to the user. Like the second video presentation flag of the PSR14 760, the flag of the PSR2 720 may be changed between enabled and disabled by a user operation (UO), a command, or an application programming interface (API).

In addition, the PSR2 720 may include a flag indicating whether the 'PiP PG TextST' is valid. The flag is used to indicate what kind of 'PG TextST' stream number is used when the second video stream is displayed. For example, if the flag is set to '0 _b ', when the current second video stream is displayed during the current playitem presentation, the 'PG TextST' number defined in the PSR2 720 is used. The 'PG TextST' is a 'PG TextST' stream displayed in the first video program which is the main video. On the other hand, when the flag is set to '1 _b ', the 'PiP PG TextST' stream number defined in the PSR2 is used. The flag has no effect on the optical recording / reproducing apparatus of the present invention when the second video stream is not displayed. In this case, the 'PG TextST' stream defined in the PSR2 720 may be used. The value of the flag may be changed by a navigation command, a user operation (UO) or an application programming interface.

The PSR is a memory unit (for example, PSR7 750) representing information for identifying a playitem currently being played, and a memory unit (for example, information representing a playlist for managing playback of a title currently being played). It may include a PSR6 740. Accordingly, the optical recording / reproducing apparatus of the present invention can know the currently running playlist and the currently presented playitem through the PSR6 740 and the PSR7 750. FIG. .

The PSR may include a memory unit (eg, PSR29 770) indicating a video capability of the optical recording / reproducing apparatus. The memory unit (hereinafter, PSR29 770) may indicate, for example, whether to play a high definition (HD) second video or to play a video of a specific frequency (for example, 50 & 25 Hz). . Navigation commands and system applications (eg, BD-J applications) cannot change the values contained in the PSR29 770.

In connection with the optical recording / reproducing apparatus of the present invention, the optical recording / reproducing apparatus has a function of processing a text subtitle. Certain features within the text subtitle can also be treated as options. Such functions include, for example, user changeable style sets, user changeable palettes, inline styles, outline borders or text flow and Alignment (Text flow & alignment). Accordingly, it is required to indicate whether player capability is available by using any one of the PSRs present in the optical recording / reproducing apparatus of the present invention. For example, PSR30 780 may be used.

In this regard, if some or all of the above functions are converted to mandatory functions, it is also possible not to indicate player implementation capabilities using the PSR. That is, the display of the player implementation capability using the PSR is optional in the implementation of the optical recording / reproducing apparatus.

9 illustrates an embodiment of management data according to the present invention.

In order to play the second video, management data including information on a playback attribute of the second video, for example, information on a playback time, a playback size and a playback position, for example, metadata about the second video is required. do. The management data will be described below using PiP metadata as an example.

The metadata may exist in a playlist which is a kind of reproduction management file. 9 illustrates a case in which a PiP metadata block exists in an 'ExtensionData' block of a playlist that manages playback of a first video. The PiP metadata may include at least one block header block_blocker [k] block 910 and block data block_920 block 920 according to a metadata block entry stored in the PiP metadata block. The block header 910 includes header information of an associated metadata block, and the block data 920 includes data information of an associated metadata block.

The block header 910 block includes a field indicating information identifying a playitem (hereinafter 'playitem_id' 910a) and information identifying a second video stream (hereinafter, 'secondary_video_stream_id [k]' 910b). May contain a pointing field. The 'playitem_id [k]' 910a has a value for a playitem including an STN table in which a 'secondary video_stream_id' entry designated by 'secondary_video_stream_id [k]' 910b is listed. The 'playitem_id' value is given to the playlist block of the playlist file. In this regard, entries of 'playitem_id' in PiP metadata are sorted in ascending order to 'playitem_id' recorded in PiP metadata. The 'secondary_video_stream_id [k]' 910b is used to identify the sub path and the second video stream to which the associated block data 920 is applied. This field indicates the secondary_video_stream_id value in the STN table of the playitem specified by 'playitem_id [k]'.

The block header 910 may include information indicating what timeline the related PiP metadata refers to (hereinafter, 'pip_timeline_type' 910c).

10A-10C are shown to assist in a conceptual understanding of the timeline type of the present invention. In relation to this, a time stamp (hereinafter, 'pip_metadata_time_stamp' 921a) indicating a point where PiP metadata is located may be included in the block data 920 block. The 'pip_timeline_type [k]' 910c may be distinguished according to a type of a timeline referred to by entries of related 'pip_metadata_time_stamp [i]'.

FIG. 10A illustrates the case where the PiP presentation path is synchronized with the main path and entries of 'pip_metadata_time_stamp' refer to the timeline of the playitem specified by the PiP metadata. In FIG. 10A, 'pip_metadata_time_stamp' is a presentation during a period in which a related subplayitem interval is projected on a timeline of a playitem designated by 'playitem_id [k]' 910a. Set a presentation-time. In the timeline type of FIG. 10A, 'pip_metadata_time_stamp [0]' and 'pip_metadata_time_stamp [m]' indicate that the associated subplayitem section is projected on the timeline of the playitem specified by 'playitem_id [k]' 910a. At the start of each section, they are placed at 101a and 105a, respectively.

In this regard, PiP metadata includes block data 920. The block data 920 includes second video configuration information (hereinafter, 'pip_composition_metadata') according to the number of 'pip_metadata_time_stamp'. The 'i' th 'pip_compositon_metadata' is valid in the interval from 'pip_metadata_time_stamp [i]' 102a to 'pip_metadata_time_stamp [i + 1]' 103a. The last 'pip_composition_metadata' present in the block data 920 is valid in the interval from the last 'pip_metadata_time_stamp' to the presentation end time 104a of the sub path specified by 'secondary_video_stream_id' included in the PiP metadata.

The second video configuration information is information indicating a playback position and a playback size of the second video. Referring to FIG. 9, the configuration information may include location information and size information (hereinafter, pip_scale 921d) of the second video. The position information includes horizontal position (hereinafter, 'pip_horizontal_position' 921b) information of the second video and vertical position (hereinafter, 'pip_vertical_position' 921c) information of the second video. An embodiment of second video location information according to the present invention will be described with reference to FIG. 11. In FIG. 11, the 'pip_horizontal_position' 921b indicates a horizontal position 1101 of the second video displayed on the screen from a reference point of the screen. The 'pip_vertical_position' 921c indicates a vertical position 1102 of the second video displayed on the screen from the reference point of the screen. The position at which the second video is displayed on the screen is determined by the position information 921b and 921c.

The size of the second video is determined by 'pip_scale' 921d. As described with reference to FIG. 8, the size of the second video may be adjusted to the size of the first video. For efficient playback, it is also possible for the size of the second video to be set to a discrete value. The size of the second video may be represented by a ratio (scale) to the size of the first video, for example, '× 1', '× 1/2', '× 1/4', '× 1.5'. It may be.

In the embodiment of FIG. 10A, since the PiP presentation path is synchronized with the main path, the sub path designated by 'secondary_video_stream_id' 910b described above is usually the first or second type sub path described in FIG. 2. .

In the case of the timeline type of FIG. 10A, since the second video is reproduced in synchronization with the main path, the second video also follows the timeline of the main path. That is, when the main path jumps or backs to a predetermined position, the second video is played according to the position and scale information of 'pip_metadata_time_stamp' related to the jump or back time.

FIG. 10B illustrates a case where the PiP presentation path is not synchronized with the main path and 'pip_metadata_time_stamp' entries refer to the timeline of the sub path. In the embodiment of FIG. 10B, since the PiP presentation path is not synchronized with the main path, the sub path specified by the aforementioned 'secondary_video_time_stamp_id' 910b is usually the second type of the sub paths described in FIG. 2. to be. In the timeline type of FIG. 10B, 'pip_metadata_time_stamp' determines a presentation time in a subplayitem section included in a subpath specified by 'secondary_video_stream_id [k]' included in PiP metadata. In this timeline type, 'pip_metadata_time_stamp [0]' is preferably placed at the start point 101b of the subplayitem included in the subpath specified by 'secondary_video_stream_id [k]'.

In the case of the timeline type of FIG. 10B, since the second video refers to the timeline of the subplayitem, the second video is played through the subpath regardless of the progress of reproduction through the main path. That is, even if the playback point of the main path is changed to a specific part of the timeline of the playitem constituting the main path, the presentation position and scale of the second video are not changed. This is different from the timeline type of FIG. 10A.

FIG. 10C illustrates a case where the PiP presentation path is not synchronized with the main path and 'pip_metadata_time_stamp' entries refer to the timeline of the playitem specified by 'playitem_id [k]' included in the PiP metadata. As in FIG. 10A, the timeline type of FIG. 10C also refers to the timeline of the playitem. Accordingly, the playback start time of the subplayitem, that is, 'subplayItem_in_time' is projected to one point 102c of the timeline of the playitem. In the timeline type of FIG. 10C, 'pip_metadata_time_stamp' determines a presentation time in a playitem section designated by the 'playitem_id [k]'. In the timeline type of FIG. 10C, 'pip_metadata_time_stamp [0]' is preferably placed at the start point 101c of the playitem section designated by the 'playitem_id [k]'. The timeline type of FIG. 11C is similar to the timeline type of FIG. 11A. In the case of the timeline type of FIG. 11C, 'pip_metadata_time_stamp [0]' is located at the start instruction 101c of the playitem section. However, for the timeline type of FIG. 11A, 'pip_metadata_time_stamp [0]' is the start point 101a of the section where the associated subplayitem section is projected onto the timeline of the playitem specified by the 'playitem_id [k]'. To increase.

The last 'pip_composition_metadata' present in one block data 920 is valid until the presentation end time of the sub path specified by the 'secondary_video_stream_id' included in the PiP metadata. Therefore, 'pip_metadata_time_stamp [1 + i] is valid until the out time 104c of the current playitem. However, since the second video is played by the sub pass, the second video is not displayed after the subplayitem out time 103c.

In the embodiment of FIG. 10C, since the PiP presentation path is not synchronized with the main path, the sub path designated by 'secondary_video_time_stamp_id' 910b described above is preferably the second type among the sub paths described with reference to FIG. 2. Do.

In the case of the timeline type of FIG. 10C, when the playback position of the main path jumps or backs to a predetermined position, metadata of the jumped or backed point is applied to the second video where playback starts. Referring to FIG. 10C, for example, 'pip_composition_metadata [i + 1]' corresponding to 'pip_metadata_time_stamp [i + 1]' is applied to the second video, and the playback position of the main path is' pip_metadata_time_stamp [ If the back of the position of 'pip_metadata_time_stamp [i]' at the position of 'i + 1]', 'pip_composition_metadata [i]' corresponding to 'pip_metadata_time_stamp [i]' is applied to play the second video.

The contents of time information, location information, size information, etc., in which the second video configuration information described in the embodiment of FIG. 10A is valid, are similarly applied to FIGS. 10B and 10C.

In the embodiment of FIG. 9, the play time information and the configuration information of the PiP are included in the playlist. However, the information may be included in the header of the second video stream implementing the PiP.

12 illustrates one embodiment of a table including information about a second video stream of the present invention. The table (hereinafter STN table) defines a list of elementary streams that the optical recording / reproducing apparatus can select during the presentation of the current playitem and the subpaths associated with the current playitem. It is up to the disc maker to decide which of the streams of the main clip and subpaths will have an entry in the STN table of each playitem.

The optical recording / reproducing apparatus of the present invention has a function of processing second video and second audio, presentation graphics, and text subtitles. Thus, the STN table of the present invention stores entries related to the second video and second audio, presentation graphics, and text subtitles.

Referring to FIG. 12, the STN table of the present invention includes a second video stream number value corresponding to the 'secondary_video_stream_id' value. As defined in block 1250 of FIG. 12, the 'secondary_video_stream_id' is obtained by starting with '0' and incrementing by '1' until it becomes equal to the number of second video streams 1220 defined in the STN table. . The second video stream number is equal to the value of 'second' plus 'secondary_video_stream_id'.

According to the 'secondary_video_stream_id', a stream entry (stream_entry) block 1260 is defined in the STN table. The stream entry block 1260 includes a type of database for identifying an elementary stream specified by a stream number for the stream entry. The stream entry block of the present invention includes information identifying a subpath associated with playback of the second video and information identifying a subclip entry defined in the subplayitem of the subpath referred to by the information. do.

The optical recording / reproducing apparatus of the present invention, based on the 'playitem_id' 910a and the 'secondary_video_stream_id' 910b included in the PiP metadata described with reference to FIG. 9, may identify a stream entry block associated with playback of the second video. Can be. The stream entry block contains information identifying the associated subpath and subpath clip entries, so that it is possible to play back appropriate streams for playback of the second video. Since the second video is presented according to the sub pass, when the 'playitem_id' 910a and the 'secondary_video_stream_id' 910b are determined, the playback time of the second video and the playback order of the streams constituting the second video are determined. All. In this regard, 'pip_metadata_time_stamp' 921a refers to a timeline of a related playitem or a subplayitem according to 'pip_timeline_type' 910c. According to the pip_composition_metadata corresponding to the 'pip_metadata_time_stamp' 921a, the second video is presented in a specific position at a specific size.

The 'playitem_id' 910a, the 'secondary_video_stream_id' 920b, the 'pip_timeline_type' 910c, and the 'pip_metadata_time_stamp' 921a may be broadly referred to as time information in the PiP metadata. This is because the information is related to the playback time of the second video. However, in terms of the timeline followed by PiP metadata, only 'pip_timeline_type' (910c) and 'pip_metadata_time_stamp' (921a) may be regarded as time information.

In the present invention, the STN table includes a 'PiP PG textST' stream number value for the presentation graphics / text subtitle stream entry associated with the 'PiP_PG_textST_stream_id' value. The value of 'PiP_PG_textST_stream_id' is the same as the value of 'PG_textST_stream_id'. The 'PiP_PG_textST' stream number is obtained by adding '1' to 'PG_textST_stream_id'. As defined in block 1240 of FIG. 12, the value of 'PG_textST_stream_id' starts from '0' and the number of 'PG textST' stream entries 1210 and additional 'PG textST' stream entries for PiP applications. It is obtained by incrementing '1' until the number of fields 1230 is equal to the sum of the numbers.

According to the present invention, the second audio or 'PiP PG textST' streams may be played together with the second video when playing the second video together with the first video, that is, when performing a PiP application. In this case, a playback relationship with the second audio or 'PG textST' to be played together with the second video needs to be defined. Accordingly, the STN table of the present invention includes information about the allowed combinations of the second video and the second audio and the allowed combinations of the second video and the 'PiP PG textST' streams.

Referring to FIG. 12, the STN table in the playitem of the present invention includes a 'comb_ino_Secondary_video_Secondary_audio' block 1270. The 'comb_ino_Secondary_video_Secondary_audio' block 1270 defines allowed combinations of corresponding second video streams and 'PiP PG textST' streams. That is, the block 1270 includes information about the second audio stream that is allowed to be played with the second video stream. The second audio stream information may include, for example, the number of second audio streams that are allowed to be played together and information identifying the second audio stream (eg, secondary_audio_stream_id).

The STN table includes a 'comb_info_Secondary_video_PiP_PG_textST' block 1280. That is, the block 1280 includes information on the 'PiP PG textST' stream that is allowed to be presented with the second video stream. The 'PiP PG textST' stream information may include, for example, the number of 'PiP PG textST' streams allowed to be played together and information (eg, secondary_audio_stream_id) identifying the 'PiP PG textST' stream. have.

13 shows an embodiment of a data reproduction method according to the present invention.

When the reproduction of the video data starts, the optical recording / reproducing apparatus 10 of the present invention confirms the metadata managing the reproduction of the second video (S10). The metadata includes information related to the playback of the second video. As in the embodiment of FIG. 9, the metadata may be included in a playlist file. The controller 12 controls the second video decoder 810b to decode the second video stream according to the metadata (S20). The metadata includes information about the playback time and composition of the second video. The configuration information includes 'pip_horizontal_position' 921b, 'pip_vertical_position' 921c, and 'pip_scale' 921d. As described with reference to FIG. 12, the time information may include 'playitem_id' 910a, 'secondary_video_stream_id' 920b, 'pip_timeline_type' 910c, and 'pip_metadata_time_stamp' 921a. Thus, the second video decoder 810b decodes the second video at the time defined in the time information at the position and size defined in the configuration information. The decoded second video is provided to the user through the screen 20 on which the first video is displayed (S30).

The first video and the second video may be provided to the decoder from the recording medium 30 or the storage 15. That is, all the first video and the second video to be played back may be provided from the recording medium 30, and all the first video and the second video to be played back may be provided from the storage 15. It is also possible for the first video to be provided from the record carrier 30 and the second video to be provided from the storage 15, except in the case where the first video and the second video are multiplexed in the same stream. Of course, the reverse is also possible. However, when both the first video and the second video are stored in the recording medium, one of the two videos must be copied to the storage 15 in order to simultaneously play the first video and the second video.

According to the recording medium, the data reproducing method and apparatus and the data recording method and the recording apparatus according to the present invention, it is possible to reproduce the second video together with the first video. Furthermore, it becomes possible to perform the regeneration efficiently. Therefore, the content provider may be able to compose a variety of content, there is an advantage that the user can experience a variety of content.

Embodiments of the present invention described above, those skilled in the art, within the spirit and scope of the present invention disclosed in the appended claims, it is apparent that other various embodiments can be improved, changed, replaced or added, etc. something to do. Therefore, it is obvious that the present invention includes the improvements and modifications of the present invention within the scope of claims and equivalents.

Claims (44)

A first video stream representing a first presentation path and a second video stream representing a picture-in-picture presentation path relating to the first presentation path. The data area to store, A management area including composition information including position information indicating a location at which to display the second video stream and storing management information for managing playback of the picture-in-picture presentation path; A recording medium having a data structure for managing reproduction of at least one picture-in-picture presentation path The method of claim 1, The position information includes vertical position information indicating a vertical position and horizontal position information indicating a horizontal position, at which a top left pixel of the second video stream is to be displayed on a display of the first video stream. doing Record carrier The method of claim 1, The configuration information includes scale information indicating a size at which to display the second video stream. Record carrier A first video stream representing a first presentation path and a second video stream representing a picture-in-picture presentation path relating to the first presentation path. The data area to store, A management area including composition information including scale information indicating a size at which to display the second video stream and storing management information for managing playback of the picture-in-picture presentation path; A recording medium having a data structure for managing reproduction of at least one picture-in-picture presentation path The method of claim 4, wherein The scale information indicates a display scale of the second video stream relative to the first video stream. Record carrier The method of claim 5, wherein The scale information indicates one of no scale, a half scale, a quarter scale, a one and a half scale, and a full scale. Record carrier Configuration information including position information indicating a position at which to display a second video stream representing a picture-in-picture presentation path about the first presentation path represented by the first video stream. Reproducing management information including at least a picture-in-picture presentation path;  Playing the first video stream and the second video stream based on the management information. A method of managing playback of at least one picture-in-picture presentation path The method of claim 7, wherein The position information includes vertical position information indicating a vertical position at which the top left pixel of the second video stream is to be displayed on a display of the first video stream. Way The method of claim 7, wherein The position information includes horizontal position information indicating a horizontal position at which the top left pixel of the second video stream is to be displayed on a display of the first video stream. Way The method of claim 9, The position information includes vertical position information indicating a vertical position at which the top left pixel of the second video stream is to be displayed on a display of the first video stream. Way The method of claim 7, wherein The configuration information includes scale information indicating a size at which to display the second video stream. Way The method of claim 11, The scale information indicates a display scale of the second video stream relative to the first video stream. Way The method of claim 12, The scale information indicates one of no scale, a half scale, a quarter scale, a one and a half scale, and a full scale. Way The method of claim 10, The management information includes timing information indicating the start of a section in which the configuration information is valid. Way The method of claim 14, The management information includes picture-in-picture timeline information, and the picture-in-picture timeline information includes a timeline and a second line of a play item in which the timing information indicates a playback section of the first video stream. A reference to one of the subpaths timelines indicating the playback interval of the video stream Way The method of claim 15, The picture-in-picture timeline information further indicates whether the second video stream is displayed in synchronization with the first video stream. Way The method of claim 7, wherein The management information includes timing information indicating the start of a section in which the configuration information is valid. Way The method of claim 17, The management information includes picture-in-picture timeline information, and the picture-in-picture timeline information includes a timeline and a second line of a play item in which the timing information indicates a playback section of the first video stream. A reference to one of the subpaths timelines indicating the playback interval of the video stream Way The method of claim 18, The picture-in-picture timeline information further indicates whether the second video stream is displayed in synchronization with the first video stream. Way The method of claim 7, wherein The configuration information includes scale information indicating the size at which the second video stream is displayed. Way The method of claim 20, The scale information indicates a display scale of the second video stream relative to the first video stream. Way The method of claim 21, The scale information indicates one of no scale, a half scale, a quarter scale, a one and a half scale, and a full scale. Way The method of claim 20, The playing of the first video stream and the second video stream may include: displaying the first video stream and the first video stream such that the second video stream is displayed at a size indicated by the position information and the scale information. 2 play the video stream Way The method of claim 7, wherein The playing of the first video stream and the second video stream may include playing the first video stream and the second video stream so that the second video stream is displayed at a position indicated by the position information. Way The method of claim 7, wherein The playing of the first video stream and the second video stream may include decoding the second video stream using a decoder different from a decoder that decodes the first video stream. Way Configuration information including scale information indicating a size at which to display a second video stream representing a picture-in-picture presentation path about the first presentation path represented by the first video stream. Reproducing management information including at least a picture-in-picture presentation path; Playing the first video stream and the second video stream based on the management information. A method of managing playback of at least one picture-in-picture presentation path, comprising: The method of claim 26, The scale information indicates a display scale of the second video stream relative to the first video stream. Way The method of claim 26, The scale information indicates one of no scale, a half scale, a quarter scale, a one and a half scale, and a full scale. Way A driver configured to drive the player to play data from the recording medium; Configuration information including position information indicating a position at which to display a second video stream representing a picture-in-picture presentation path about the first presentation path represented by the first video stream. And control the driver to reproduce management information that manages playback of at least a picture-in-picture presentation path, and controls the driver based on the management information to control the first video stream and the second video stream. A controller configured to play the Device The method of claim 29, The position information includes vertical position information indicating a vertical position and horizontal position information indicating a horizontal position, at which a top left pixel of the second video stream is to be displayed on a display of the first video stream. doing Device The method of claim 30, The configuration information includes scale information indicating a size at which to display the second video stream. Device The method of claim 32, A first decoder configured to decode the first video stream; A second decoder configured to decode the second video stream Device further comprising A driver configured to drive the player to play data from the recording medium; Configuration information including scale information indicating a size at which to display a second video stream representing a picture-in-picture presentation path about the first presentation path represented by the first video stream. And control the driver to reproduce management information that manages playback of at least a picture-in-picture presentation path, and controls the driver based on the management information to control the first video stream and the second video stream. A controller configured to play the Device The method of claim 33, wherein The scale information indicates a display scale of the second video stream relative to the first video stream. Device The method of claim 34, wherein The scale information indicates one of no scale, a half scale, a quarter scale, a one and a half scale, and a full scale. Device A first video stream representing a first presentation path and a second video stream representing a picture-in-picture presentation path relating to the first presentation path. Recording in a data area of the recording medium; A recording area including composition information including position information indicating a position at which to display the second video stream and storing management information for managing reproduction of the picture-in-picture presentation path; Steps to write to the management area of A method of recording a data structure for managing reproduction of at least one picture-in-picture presentation path, comprising: The method of claim 36, The position information includes vertical position information indicating a vertical position and horizontal position information indicating a horizontal position, at which a top left pixel of the second video stream is to be displayed on a display of the first video stream. doing Way The method of claim 37, wherein The configuration information includes scale information indicating a size at which to display the second video stream. Way The method of claim 36, The recording of the first video stream and the second video stream includes the first and second video streams such that the first and second video streams are separated from the data stream reproduced from the recording medium and decoded by a separate decoder. To record Way A driver configured to drive the recorder to play data from the recording medium, A first video stream representing a first presentation path and a second video stream representing a picture-in-picture presentation path relating to the first presentation path, the data area of the recording medium; Control the driver to write to the device, and include composition information including position information indicating a position to control the driver to display the second video stream, and play back the picture-in-picture presentation path. And a controller configured to record management information for managing data in a management area of the recording medium. Device The method of claim 40, The position information includes vertical position information indicating a vertical position and horizontal position information indicating a horizontal position, at which a top left pixel of the second video stream is to be displayed on a display of the first video stream. doing Device 42. The method of claim 41 wherein The configuration information includes scale information indicating a size at which to display the second video stream. Device The method of claim 40, The controller controls the driver to record the first and second video streams so that the first and second video streams are separated from the data streams reproduced from the recording medium and decoded by separate decoders. Device The method of claim 29, At least one filter configured to separate at least one of the first video stream and the second video stream from data reproduced from the recording medium Device further comprising