JP5233819B2 - VIDEO RECORDING DEVICE, VIDEO REPRODUCTION DEVICE, VIDEO RECORDING METHOD, AND VIDEO REPRODUCTION METHOD - Google Patents

Description

  The present invention relates to a video recording device, a video playback device, a video recording method, and a video playback method.

  As described in Patent Document 1, video data is widely copied between different devices for backup and dubbing. Currently, there are a wide variety of recording formats of video data, and various methods are used according to recording media and the like. For example, in a small video camera, devices of different systems such as a DVD video camera, an SD video camera, a DV video camera, and a BD video camera are commercialized.

  In addition, even for the same recording medium, recording formats of different standards are often used. For example, even a device that uses a DVD as a recording medium uses a DVD-ROM format, a DVD-VR format, or the like depending on the device.

JP 2002-334561 A

  In general, video data is accompanied by unique reproduction control information specific to a recording format for reproducing the video data. For this reason, when video data is copied, it is necessary to copy the reproduction control information in addition to the video data.

  However, when video data is copied between different devices, if the recording formats are different, the video data and the playback control information cannot be played back at the copy destination simply by copying them as they are.

  For this reason, when copying between devices of different standards, it is necessary to convert the video data and the unique reproduction control information to the recording format of the copy destination, which takes time and effort. It will be. In particular, since the recording format often depends on the recording medium, this problem is significant when copying between different recording media. At this time, since the video data after the recording format conversion is recorded in the copy destination, the data in the original recording format is not backed up. Furthermore, since the specific reproduction control information differs depending on the recording format standard, there is a problem that the operational feeling when reproducing the copied video data also varies. In addition, even when editing is performed on the video data at the copy destination, it is necessary to appropriately reproduce the edited video data. Therefore, an object of the present invention is to improve convenience when copying video data between different devices.

  In order to solve the above problems, a video recording apparatus according to a first aspect of the present invention includes video information input means for inputting video information including video data and unique reproduction control information specific to the recording format of the video data, Recording format discrimination means for discriminating the recording format of the video data, reading out the inherent reproduction control information based on the discriminated recording format, and converting the read out intrinsic reproduction control information into a general-purpose format independent of the recording format Common reproduction control information generating means for generating common reproduction control information, verification information for verifying the identity of the specific reproduction control information, and adding to the common reproduction control information; verification information; And recording means for recording the common reproduction control information to which the inspection information is added on a recording medium.

  Here, the verification means can use the hash value of the inherent reproduction control information as the inspection information.

  In order to solve the above problem, a video playback apparatus according to a second aspect of the present invention includes video information including video data and unique playback control information specific to a recording format of the video data, and the unique playback control information is The common reproduction from the recording medium recorded with the common reproduction control information to which the inspection information for verifying the identity of the unique reproduction control information is added, which is information converted into a general-purpose format independent of the recording format. Reading means for reading control information, verification means for verifying the specific reproduction control information based on the inspection information added to the read common reproduction control information, and the specific reproduction control information have been verified A reproduction processing means for performing reproduction processing of the video data according to the read common reproduction control information.

  Here, the verification means verifies the specific reproduction control information by comparing the inspection information added to the common reproduction control information with the inspection information obtained from the individual reproduction control method included in the video information. Can be done.

  In order to solve the above problem, a video recording method according to a third aspect of the present invention includes a step of inputting video information including video data and unique reproduction control information specific to a recording format of the video data, and the video data Discriminating the recording format, and reading out the inherent reproduction control information based on the discriminated recording format, and generating the common reproduction control information obtained by converting the read inherent reproduction control information into a general-purpose format independent of the recording format A step of generating inspection information for verifying the identity of the specific reproduction control information and adding the inspection information to the common reproduction control information, the video information, and the common reproduction control to which the inspection information is added. Recording information on a recording medium.

  In order to solve the above-described problem, a video playback method according to a fourth aspect of the present invention includes video information including video data and unique playback control information specific to a recording format of the video data, and the unique playback control information includes the unique playback control information. The common reproduction from the recording medium recorded with the common reproduction control information to which the inspection information for verifying the identity of the unique reproduction control information is added, which is information converted into a general-purpose format independent of the recording format. A step of reading control information, a step of verifying the specific reproduction control information based on the inspection information added to the read common reproduction control information, and a case where the specific reproduction control information is verified. Performing a reproduction process of the video data in accordance with the read common reproduction control information.

  According to the present invention, convenience when copying video data between different devices is enhanced.

It is a figure which shows typically the structure of the video recording / reproducing system which concerns on this embodiment. It is a block diagram which shows the function structure of a media recording / reproducing apparatus and a digital video camera. It is a block diagram which shows the structure of a test | inspection information production | generation / verification part. 10 is a flowchart for describing processing for copying video information recorded on a DVD disc loaded in a digital video camera to the HDD by the media recording / reproducing apparatus. It is a figure which shows the directory / file structure of the DVD disc based on DVD-VR specification. It is a flowchart explaining the common reproduction | regeneration control information addition process which a common reproduction | regeneration control information processing part performs. It is a figure which shows an example of the analysis result outline | summary of a common reproduction | regeneration control information processing part. It is a figure which shows an example of the produced | generated common reproduction | regeneration control information. It is a figure which shows an example of the test | inspection information added. It is a figure which shows the directory / file structure of HDD in the state which the copy process of the video information was complete | finished. 10 is a flowchart for explaining reproduction of video information stored in an HDD in a media recording / reproducing apparatus.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram schematically showing a configuration of a video recording / reproducing system according to the present embodiment. As shown in the figure, the video recording / playback system 1 includes a media recording / playback device 10 connected to a display device 60 and a digital video camera 20. The media recording / reproducing apparatus 10 and the digital video camera 20 can communicate with each other according to a predetermined communication standard, for example, USB. In this case, video data, control data, and the like can be transmitted by connecting both via the USB cable 40. Note that the video data includes audio information and other information.

  The digital video camera 20 includes a portable or fixed recording medium, and records video data in a predetermined recording format corresponding to the recording medium. The video data is information necessary for playing back the video data and is accompanied by unique playback control information (navigation information) specific to the recording format of the video data. Called. In this embodiment, for example, it is assumed that the recording medium is an HDD and the recording format is DVD-VR. Of course, this recording medium and recording format are merely examples, and are not limited to HDD and DVD-VR, but may be a memory, AVCHD, or the like.

  The media recording / reproducing apparatus 10 includes a portable recording medium, and can record video information on the recording medium and reproduce the recorded video information. In the present embodiment, the recording medium of the media recording / reproducing apparatus 10 is, for example, a DVD, but is not limited to this, and may be a memory, a BD, or the like. Further, the media recording / reproducing apparatus 10 has a function of copying or moving video information recorded on an HDD provided in the digital video camera 20 to a DVD. In the following description, a description will be given by copying. At this time, the video information recorded in the HDD is copied to the DVD as it is, and then the video data included in the video information is playback control information for general playback without depending on the recording format. Common reproduction control information is added.

  FIG. 2 is a block diagram showing functional configurations of the media recording / reproducing apparatus 10 and the digital video camera 20 connected via the USB cable 40. As shown in the figure, the media recording / reproducing apparatus 10 includes a communication unit 110, a control unit 120, an operation receiving unit 130, a disk management unit 140, a DVD 145, a reproduction processing unit 150, an image processing unit 160, an image output unit 170, a recording format. A determination unit 180, a common reproduction control information processing unit 190, and an inspection information generation / verification unit 195 are provided. A drive function for a recording medium such as a hard disk or an SD card may be provided.

  The communication unit 110 communicates with the digital video camera 20 via the USB cable 40 to transmit control data and receive video information. The control unit 120 is a functional unit that comprehensively controls various processes in the media recording / reproducing apparatus 10. For example, a process for creating various menu screens, playlist display screens, and the like for presenting information to the user and receiving operations. To do.

  The operation accepting unit 130 accepts an operation from a user via an operation button or the like provided on the media recording / reproducing apparatus 10. The operation received by the operation receiving unit 130 from the user is, for example, an instruction to copy video data from the connected digital video camera 20, an instruction to reproduce video data or a playlist stored on the DVD 145, a menu selection operation, or the like.

  The disk management unit 140 controls reading and writing of data with respect to the DVD 145. The playback processing unit 150 performs playback processing of video data recorded on the DVD 145. Specifically, processing such as decoding and seeking of video data is performed with reference to reproduction control information attached to the video data. The image processing unit 160 performs processing for generating a still image having a predetermined resolution based on an image obtained from the video data.

  The image output unit 170 is connected to the display device 60, and performs processing for outputting the video reproduced by the reproduction processing unit 150, the menu screen generated by the control unit 120, the playlist display screen, and the like to the display device 60. Do.

  The recording format discrimination unit 180 performs processing for discriminating the recording format of video information copied from the digital video camera 20. The recording format of the video information can be determined by, for example, examining the directory structure in which the video information is stored, or examining the presence / absence, name, content, etc. of a predetermined file. In the recording format discriminating unit 180, information on a plurality of recording formats, for example, the DVD-VR standard, the BD-RE standard, the SD video standard, the AVCHD standard, etc. is registered in advance so as to be compatible with a plurality of recording formats. deep. Any of these recording formats can handle video data compressed by a predetermined method such as MPEG-2, MPEG-4 / AVC.

  The common playback control information processing unit 190 generates common format common playback control information based on the unique playback control information included in the video information. Here, the common reproduction control information is reproduction control information obtained by converting unique reproduction control information that differs for each recording format into a general-purpose format such as an XML format so as not to depend on the recording format. By reproducing the video data using the common format common reproduction control information, the video data using the common compression method can be reproduced universally regardless of the recording format of the video data. For this reason, the common reproduction control information processing unit 190 is configured to be able to interpret the contents of the respective unique reproduction control information for the recording formats that can be discriminated by the recording format discrimination unit 180. Details of the process for generating the common reproduction control information will be described later. Further, when the common reproduction control information processing unit 190 generates the common reproduction control information, if the reproduction control information includes representative image information such as a thumbnail, the common reproduction control information processing unit 190 associates the representative image with the common reproduction control information. May be performed.

  The inspection information generation / verification unit 195 generates inspection information based on the unique reproduction control information included in the video information stored in the DVD 145, records the information in the common reproduction control information, and records the common reproduction control information. The verification information is used to verify that there is no change in the specific reproduction control information. That is, when the video information stored on the DVD 145 is edited by the user, the unique reproduction control information changes. If the common reproduction control information recorded on the DVD 145 is based on the unique reproduction control information before editing, there is a possibility that a problem occurs when reproduction using the common reproduction control information is performed. For this reason, in this embodiment, when reproducing the video information stored in the DVD 145, the inspection information generation / verification unit 195 verifies that there is no change in the inherent reproduction control information.

  FIG. 3 is a block diagram illustrating a configuration example of the inspection information generation / verification unit 195. In the example of this figure, the hash value of the specific reproduction control information is used as the inspection information. Therefore, the inspection information generation / verification unit 195 includes a hash value generator 195a and a comparator 195b. The hash value can be calculated using a widely known method such as MD5 or SHA-1. When generating the inspection information, the hash value generator 195a is used to generate the hash value of the unique reproduction control information. At the time of verification, the comparator 195b compares the hash value of the latest unique reproduction control information generated using the hash value generator 195a with the hash value of the inspection information generated when the common reproduction control information is generated. . The inspection information is not limited to the hash value, and other information may be used.

  Returning to FIG. 2, the digital video camera 20 includes a photographing unit 210, a recording / reproducing unit 220, and a communication unit 230, and records video information in the HDD 30 loaded therein. In the present embodiment, video information is recorded according to the DVD-VR standard. Of course, it is not limited to the HDD and DVD-VR standards.

  The photographing unit 210 includes a photographing mechanism such as a lens and an image sensor, and outputs video data obtained by converting optical information into electronic information. The recording / reproducing unit 220 performs processing for recording the video data input from the photographing unit 210 on the HDD 30 in accordance with the DVD-VR standard. The communication unit 230 communicates with the media recording / reproducing apparatus 10 via the USB cable 40 to transmit video information recorded in the HDD 30 and receive control data.

  Next, processing in which the media recording / reproducing apparatus 10 copies video information recorded in the HDD 30 loaded in the digital video camera 20 to the DVD 145 will be described with reference to the flowchart of FIG. In general, video information includes video data and unique reproduction control information specific to a recording format in which control information for reproducing the video data is recorded. The video data is compressed by a predetermined encoding method such as MPEG-2 and stored in a predetermined directory as one or a plurality of files. Further, reproduction control information is also stored in a predetermined directory as one or a plurality of files according to control information to be recorded.

  When the digital video camera 20 is connected to the media recording / reproducing apparatus 10 via the USB cable 40, communication is started according to the USB protocol. The recording format discriminating unit 180 of the media recording / reproducing apparatus 10 discriminates the recording format of video information recorded in the HDD 30 by acquiring the directory / file structure of the HDD 30 loaded in the digital video camera 20 (S101). ). Here, the recording format is determined by checking the directory / file structure of the HDD 30 or by checking the structure and information specific to the recording format such as the presence / absence, name, and content of a predetermined file.

  In this embodiment, since the video information of the HDD 30 is recorded in the DVD-VR standard recording format, an outline of the DVD-VR standard recording format will be described. FIG. 5 is a diagram showing a directory / file structure of a DVD disc based on the DVD-VR standard. As shown in the figure, in the DVD-VR standard, a “DVD_RTAV” directory is created in the root directory, and at least two files are arranged in the “DVD_RTAV” directory. One of them, “VR_MOVIE.VRO”, is a file that stores video data obtained by encoding audio / video shot by the digital video camera 20 in accordance with the MPEG system. Another “VR_MANGER.IFO” is a file including unique reproduction control information for reproducing the contents of “VR_MOVIE.VRO”, and is also called a navigation information file.

  Therefore, the recording format determination unit 180 detects that the “DVD_RTAV” directory is created in the root directory of the HDD 30 and the “VR_MOVIE.VRO” file and the “VR_MANGER.IFO” file are arranged in the HDD 30. It can be determined that the recording format of the recorded video information is the DVD-VR standard. Similarly, the recording format discrimination unit 180 can discriminate each recording format by detecting a directory / file structure specific to the AVCHD standard, the SD-VIDEO standard, or the like.

  “VR_MANGER.IFO”, which is unique playback control information in the DVD-VR standard, is described in accordance with a recording format defined in the DVD-VR standard. The contents described in “VR_MANGER.IFO” are various, but typically include “whole media information”, “stream information”, “playlist information”, “time map information”, and “representative image information”.

  “Media whole information” is information for managing the video data recorded in the recording medium and all the various information related thereto.

  “Stream information” is information used for decoding video data such as a video encoding method, resolution, frame rate, audio encoding method, number of channels, sampling frequency, and the like.

  “Playlist information” is information for reproducing a scene (chapter) obtained by dividing video data in an arbitrary order. A scene is expressed as cell information that holds a start time and an end time, and playlist information is composed of one or more pieces of cell information. Note that a plurality of pieces of playlist information can be recorded in order to enable combined playback of various scenes.

  The “time map information” is information in which the elapsed time of the video and the recording position of the video data corresponding thereto are recorded in a table format. In general, in MPEG-compliant video encoding, a method of dynamically allocating a code amount according to the complexity of video data is employed. In this case, the elapsed time of the video data and the code amount are not in a linear relationship. Therefore, even if the start time of the cell information is given, it is difficult to determine the recording position of the corresponding video data and perform access for reproduction at high speed. In order to solve this problem, time map information is recorded. By referring to the time map information, it is possible to quickly access the accurate video data position from the start time or end time of the cell information.

  The “representative image information” is information for displaying an image representing video data or a scene, so-called a thumbnail image, so that the user can easily identify the video data or scene. The representative image information records specific time information of video data, and the image processing unit 160 of the media recording / reproducing apparatus 10 generates a still image from the video data by referring to the representative image information. This still image can be used as a representative image on a menu screen for video information selection, playlist selection, scene selection, and the like.

  Returning to the description of the flowchart shown in FIG. 4, when the recording format determination unit 180 determines the recording format of the video information recorded in the HDD 30, the recording format determination unit 180 cannot determine the recording format or the recording format is not compatible (S102: No) does not perform the processing after S103. On the other hand, if the recording format is compatible (S102: Yes), the following video information copy process is performed. Note that the video information copy process starts after receiving a start instruction from the user, for example.

  In the video information copy process, the control unit 120 instructs the disk management unit 140 to build the same directory structure on the DVD 145 as the HDD 30, and the disk management unit 140 creates the same directory on the DVD 145 as the HDD 30. (S103).

  Subsequently, the control unit 120 instructs the disk management unit 140 to copy the file stored in the HDD 30 to the DVD 145, and the disk management unit 140 executes (S104). As a result, the contents of the HDD 30 are copied to the DVD 145 and have the same directory / file structure as the HDD 30.

  Then, the control unit 120 instructs the common reproduction control information processing unit 190 to add the common reproduction control information to the video information copied to the DVD 145, and the common reproduction control information processing unit 190 adds the common reproduction control information. Processing is performed (S105).

  FIG. 6 is a flowchart showing common reproduction control information addition processing performed by the common reproduction control information processing unit 190. The common playback control information processing unit 190 acquires unique playback control information from the DVD 145 according to the recording format determined by the recording format determining unit 180 (S201). If the discriminated recording format is the DVD-VR standard as in the present embodiment, the “VR_MANGER.IFO” file in the “DVD_RTAV” directory may be referred to.

  Then, the common reproduction control information processing unit 190 analyzes the acquired unique reproduction control information (S202). In general, the content of the inherent reproduction control information is binary data described according to a syntax uniquely defined for each recording format. The common reproduction control information processing unit 190 is configured to be able to interpret these syntaxes in advance.

  FIG. 7 is a diagram illustrating an example of an analysis result summary of the common reproduction control information processing unit 190. As shown in the figure, the analysis result includes stream information 601, time map information 602, and playlist information 603. Note that the time map information 602 is included in the stream information 601.

  The playlist information 603 is divided into an actual playlist that manages the reproduction of all captured videos, and a user playlist that is additionally created by the user to select and reproduce only the desired scene. Each playlist includes one or more pieces of cell information, each corresponding to a scene. Each cell information includes entry point (EP) information, time and name are linked, entry point is selected from the name, and cue playback is possible. The representative image point, stream period, cell period, and entry point are all described by a PTS (presentation time stamp) defined by the MPEG standard, for example, with a clock value of 90 kHz.

  In addition, the disc information and the playlist information 603 at the head of the analysis result include representative image information 604a, 604b, and 604c. This is because the representative image information is included in the original unique reproduction control information.

  As described above, when the representative image information is included in the original unique reproduction control information (S203: Yes), the common reproduction control information processing unit 190 performs processing corresponding to the representative image (S204). Here, processing corresponding to the representative image will be described. As described above, the representative image is a relatively low-resolution still image that displays a specific point of the video included in the video information, each playlist, scene (chapter), etc. in a thumbnail format so that the user can easily identify it. It is a picture.

  Some video information recording formats hold only time information as representative image information and do not have image information. In such a recording format, when displaying the representative image on the menu screen, the video data may be searched based on the time information to generate a corresponding still image. The generation of a still image requires decoding of video data, changing the resolution as necessary, and so on. When displaying a large number of representative images on a playback menu screen, it takes time to complete the display.

  Therefore, in the media recording / reproducing apparatus 10 of the present embodiment, when representative image information is included in the unique reproduction control information, in the process of generating the common reproduction control information based on the unique reproduction control information, the prescribed A representative image of resolution is created and stored on the DVD 145, and link information is included in the common playback control information. As a result, it is not necessary to generate a representative image each time a menu for playback is displayed, and the time until the display is completed can be shortened.

  Specifically, when the representative image information is included in the regeneration control information, the corresponding video data is searched from the DVD 145 using the entry point and time information. Then, the reproduction processing unit decodes the 150 searched video data to generate image data for several frames. Next, the image processing unit 160 selects image data corresponding to the time information, converts the image data to a specified resolution, and performs processing according to a predetermined still image compression method such as JPEG to generate a representative image.

  When a plurality of representative image information is included in one playlist, the above process is repeated. In the present embodiment, the image processing unit 160 numbers the generated representative images, and manages them together in one representative image file in which the representative images are continuous. As will be described later, the representative image file is recorded in a predetermined directory of the DVD 145 with a predetermined file name.

  When the common reproduction control information processing unit 190 ends the analysis of the unique reproduction control information, the common reproduction control information processing unit 190 generates common reproduction control information based on the analysis result (S205). In the present embodiment, the common reproduction control information is created as a text file in, for example, an XML format that is a general-purpose format in order to have versatility. Of course, the general-purpose format is not limited to the XML format. At this time, according to a predetermined XML format syntax or the like, the information element of the analysis result can be converted without losing the meaning. For this reason, it is possible to define a syntax that can represent information of the greatest common divisor of information indicated in the corresponding recording format. Or you may make it define the syntax which covers the information shown by the corresponding recording format.

  In the syntax used in the common playback control information, for example, the name defined individually in each recording format is associated with a unified name, or the parameters defined in each recording format have the same meaning Can be made common, or parameters corresponding to parameters specific to a certain recording format can be defined. In addition, in order to facilitate reference to video data, it is desirable that information representing time in the analysis result is represented by the number of video frames.

  In this embodiment, since the common playback control information is created in a text file in the XML format of the general-purpose format, a value can be written in a meaningful tag, and it is easy to understand intuitively. There is. In addition, there is an advantage that various items of each recording format can be easily handled by defining a tag.

  Here, as an example, a syntax related to a playlist used in the common reproduction control information of the present embodiment will be described. In the present embodiment, playlists are classified into two types: real playlists and user playlists. The actual playlist is a playlist created at the same time as the video data file when the content is recorded, and is a playlist closely related to the content. The user playlist is a playlist created by a user editing operation.

  Although not limited to the DVD-VR standard cited as an example in the present embodiment, the structure is synonymous with two types of playlists in other standards such as BD, although the names are different. For this reason, the playlist definition corresponding to each standard is made to correspond to the definition of the playlist and user playlist described below.

  Next, the syntax expression defined in the playlist of each standard is defined as an element of common reproduction control information expressed in the XML format. For example, a playlist name or the like is provided with a syntax expression representing the same meaning even if the notation differs for each standard. Therefore, a syntax expression corresponding to the name of the playlist is described as a playListName element.

  The description rule for the element expressed in the XML format is defined by DTD (Document Type Definition) or XML Schema which is general in the XML description. For example, a condition such as a character string for the playListName element and a maximum of 255 characters may be defined.

  FIG. 8 is a diagram illustrating an example of common reproduction control information related to actual playlist information. In this example, the cell information of the playlist is described as a playItem element 701, and the representative image information 702a and 702b and the entry point information 702c and 702d are integrated and described in the mark element 702.

  In the present embodiment, the common playback control information related to the entire video information is recorded as a “general.xfun” file described in the XML format, for example, a general format that does not depend on the recording format, and the common playback control related to the actual playlist is recorded. Information is also recorded as a “r00001.xfun” file described in a general-purpose format, for example, an XML format that does not depend on the recording format, and common playback control information related to the user playlist is recorded in an “v00002.xfun” file described in the XML format. Shall be recorded as Information recorded in the “general.xfun” file corresponds to “whole media information”.

  The representative image file related to the actual playlist is recorded as “r00001.thbf”, and the representative image file related to the user playlist is recorded as “r00002.thbf”. Reference information to individual representative images of these representative image files is indicated by the numbers in the thumbnailIndex element as representative image information 702a and 702b.

  As illustrated in FIG. 8, the playListMark element 702 includes a plurality of mark elements, and the mark element includes a type element, a refToPlayItem element, a markTime element, and a thumbnailIndex element.

  The type element is type information such as whether the mark element represents a representative image of a playlist or whether it is chapter information as expressed by an entry point (EP) of the DVD-VR standard. By providing such type information, the representative image information can be managed uniformly in the playListMark element 702.

  The refToPlayItem element and the markTime element indicate points in the playlist that are the basis for creating the representative image. The thumbnail index element is reference information to individual representative images in the representative image file as described above. Since the representative image is generated when the common reproduction control information is generated, it is not necessary to search the video data at the time of display, and the time until it is displayed can be shortened.

  Returning to FIG. 6, the inspection information generation / verification unit 195 generates and adds inspection information (S206). For the generation of the inspection information, the inspection information of the inherent reproduction control information recorded on the DVD 145 is calculated. In this embodiment, a hash value of “VR_MANGER.IFO” is calculated. Then, the calculated inspection information is added to the common reproduction control information. FIG. 9 is a diagram illustrating an example of inspection information added to the common reproduction control information. When MD5 is used as the hash value calculation method, the hash value is a 128-bit value. In this example, a hash value is represented as a hexadecimal character string as a <navhash> element 901 in a “general.xfun” file that is common reproduction control information.

  When the common reproduction control information to which the inspection information of the specific reproduction control information is added according to the procedure described above is generated, the control unit 120 stores the common reproduction control information in the DVD 145 and ends the video information copy process. (S207). As for the common reproduction control information, a “UNAV” directory for common reproduction control information is newly created and stored in the directory created in the process (S103).

  When the original video information is in the DVD-VR recording format as in this embodiment, a “UNAV” directory is created under the “DVD_RTAV” directory, and the generated common playback control information, that is, “general.xfun” is created. The file, the “r00001.xfun” file, the “v00002.xfun” file, the “r00001.thbf” file, and the “r00002.thbf” file are stored, and the video information copy process ends. FIG. 10 shows the directory / file structure of the DVD 145 in a state in which the video information copy process has been completed.

  As described above, according to the present embodiment, the common reproduction control information is created based on the unique reproduction control information included in the copy source video information, and the video information including the video data and the unique reproduction control information is not converted. While copying as it is, the common format common reproduction control information is also copied. For this reason, according to the present embodiment, only the common reproduction control information is added, so that it is possible to copy the video information as it is without changing the copy source video information.

  In addition, according to the present embodiment, the hash value is generated as the inspection information for verifying the identity of the inherent reproduction control information and added to the common reproduction control information. By comparing and verifying the hash value added to the common reproduction control information and the hash value of the latest unique reproduction control information, the update of the unique reproduction control information can be detected.

  Next, playback of video information stored on the DVD 145 in the media recording / playback apparatus 10 will be described with reference to the flowchart of FIG. When the “UNAV” directory is generated in the video information directory with reference to the DVD 145 (S301: Yes), the media recording / reproducing apparatus 10 uses the common playback control information described below. Information reproduction processing is performed. Here, even if the recording formats of the media recording / reproducing apparatus 10 and the digital video camera 20 are the same and the video data can be reproduced in accordance with the inherent reproduction control information included in the video information, or the media recording / reproducing apparatus 10 and the digital video camera 20 Even if the recording formats are different from each other, if the “UNAV” directory is generated, the video information reproduction process using the common reproduction control information may be performed. For this reason, the common playback control information is generated not only when the recording formats of the media recording / playback apparatus 10 and the digital video camera 20 are different, but also when the recording formats are the same. It may be generated. On the other hand, when the “UNAV” directory is not generated in the video information directory (S301: No), the conventional reproduction process is performed (S310).

  In the video information playback process using the common playback control information, first, the inspection information generation / verification unit 195 verifies the inherent playback control information (S302). In the verification of the unique reproduction control information, the latest unique reproduction control information is obtained from the DVD 145, and a hash value is calculated. Then, the calculated hash value is compared with the hash value of the unique reproduction control information added to the common reproduction control information. As a result, it is assumed that the two are verified if they match. On the other hand, if the common reproduction control information is recorded on the DVD 145 and then the video data is edited or the playlist is edited, the contents of the unique reproduction control information are updated and the two do not match.

  If the hash values do not match (S303: No), this is displayed and the user is warned (S304). Further, in order to reflect the content of the updated unique reproduction control information in the common reproduction control information, a reproduction process of the common reproduction control information is performed (S305). The regeneration process of the common reproduction control information can be performed according to the same procedure as the common reproduction control information generation process.

  When the hash values match (S303: Yes) and when the common reproduction control information is regenerated (S305), the play that is the common reproduction control information stored in the “UNAV” directory of the DVD 145 is played. A list file is read (S306). In the present embodiment, the “r00001.xfun” file and the “v00002.xfun” file described in the XML format correspond to the playlist file. Note that the video information reproduction process is started after receiving a playlist display instruction from the user, for example.

  Subsequently, the control unit 120 generates a menu screen for selecting a playlist according to the information recorded in the playlist file, and displays it on the display device 60 via the image output unit 170 (S307). At this time, if representative image information is included in the playlist file, a menu screen including the representative image corresponding to the representative image information is generated.

  Specifically, using the playlist identifier and the number included in the thumbnailIndex element in the representative image information, it corresponds from the representative image file such as “r00001.thbf” stored in the “UNAV” directory of the DVD 145. A representative image is acquired by reading the representative image. Then, the acquired representative image is included in the menu screen.

  Also, the playlist name in the menu screen can be acquired from the playListName element 703 shown in FIG. The layout for displaying the playlist name and the corresponding representative image is determined in advance.

  When the selection of a playlist is received from the user via the menu screen (S308), the selected playlist is played back (S309). The play list is played back according to the play item information described in the playItem element 701 included in the playList element 704 shown in FIG. That is, when the information included in the refToFileName element, the inTime element, and the outTime element is sent to the reproduction processing unit 150, the reproduction processing unit 150 causes the corresponding reproduction section in the video data such as the “VR_MOVIE.VRO” file copied to the DVD 145. Is read. Then, the video data is sequentially decoded and output to the display device 60 via the image output unit 170, whereby the video information is reproduced.

  If a plurality of video information is copied to the DVD 145, the video information is selected by referring to the “general.xfun” file in each “UNAV” directory before displaying the playlist. This menu screen may be generated and displayed. For this reason, in the “general.xfun” file, information related to video information, for example, information such as names and representative images is recorded. Thus, by displaying the video information selection menu screen based on the “general.xfun” file of each video information, the user can easily select the video information.

  Further, when the user selects a playlist on the menu screen, the representative images and scene names of scenes (chapters) constituting the playlist may be displayed in a menu format. In this case, when the user selects a specific scene from the menu screen, the playback of the video data operates to start playback from the point described by the corresponding mark element. Since the user can perform the cue playback of the scene in the menu format, the convenience of the media recording / playback apparatus 10 is improved.

  As described above, according to the media recording / reproducing apparatus 10 of the present embodiment, it is possible to perform the reproducing process using the common reproduction control information regardless of the recording format of the copy source. Therefore, it becomes possible to perform the reproduction process with a unified operation feeling even between different recording formats, and the convenience for the user is enhanced.

  Further, according to the media recording / reproducing apparatus 10 of the present embodiment, the hash value added to the common reproduction control information is compared with the hash value of the latest unique reproduction control information, and the identity of the unique reproduction control information is determined. By verifying, the update of the unique reproduction control information can be detected, and the content of the updated unique reproduction control information can be reflected in the common reproduction control information.

  Note that the above reproduction processing is not limited to media reproduction in the media recording / reproducing apparatus 10 that has performed copying. For example, when a recording medium such as a DVD disk copied by the media recording / reproducing apparatus 10 according to the above-described procedure is reproduced by another media reproducing apparatus capable of interpreting the common reproduction control information, the same procedure as the process shown in FIG. The video information can be reproduced by.

  In the description of the above embodiment, the video recording apparatus and the video reproduction apparatus of the present invention have been described as hardware configuration using block diagrams. However, the present invention is not limited to this, and the CPU executes a program. Of course, the video recording apparatus and the video reproduction apparatus of the present invention may be configured as software.

DESCRIPTION OF SYMBOLS 1 ... Video recording / reproducing system, 10 ... Media recording / reproducing apparatus, 20 ... Digital video camera, 30 ... HDD, 40 ... USB cable, 60 ... Display apparatus, 110 ... Communication part, 120 ... Control part, 130 ... Operation reception part, 140: disc management unit, 145 ... DVD, 150 ... reproduction processing unit, 160 ... image processing unit, 170 ... image output unit, 180 ... recording format determination unit, 190 ... common reproduction control information processing unit, 195 ... inspection information generation / Verification unit, 210 ... photographing unit, 220 ... recording / reproducing unit, 230 ... communication unit

Claims (6)

Video information input means for inputting video information including video data and unique playback control information specific to the recording format of the video data;
Recording format discrimination means for discriminating the recording format of the video data;
Common reproduction control information generating means for generating the common reproduction control information by reading the unique reproduction control information based on the determined recording format and converting the read unique reproduction control information into a general-purpose format independent of the recording format;
Verification means for generating inspection information for verifying the identity of the unique reproduction control information and adding it to the common reproduction control information;
Recording means for recording the video information and the common reproduction control information to which the inspection information is added, on a recording medium;
A video recording apparatus comprising: The video recording apparatus according to claim 1,
The video recording apparatus characterized in that the verification means uses the hash value of the inherent reproduction control information as the inspection information. Video information including video data and unique reproduction control information specific to the recording format of the video data, and information obtained by converting the unique reproduction control information into a general-purpose format independent of the recording format, the unique reproduction control information Reading means for reading the common reproduction control information from the recording medium on which the common reproduction control information to which the inspection information for verifying the identity is added is recorded;
Verification means for verifying the specific reproduction control information based on the inspection information added to the read common reproduction control information;
Reproduction processing means for performing reproduction processing of the video data according to the read common reproduction control information when the unique reproduction control information is verified;
A video reproducing apparatus comprising: The video playback device according to claim 3,
The verification means verifies the specific reproduction control information by comparing the inspection information added to the common reproduction control information with the inspection information obtained from the individual reproduction control method included in the video information. A featured video playback device. Inputting video information including video data and unique playback control information specific to the recording format of the video data;
Determining a recording format of the video data;
Reading the inherent reproduction control information based on the determined recording format, and generating the common reproduction control information obtained by converting the read inherent reproduction control information into a general-purpose format independent of the recording format;
Generating inspection information for verifying the identity of the unique reproduction control information and adding it to the common reproduction control information;
Recording the video information and the common reproduction control information to which the inspection information is added, on a recording medium;
A video recording method comprising: Video information including video data and unique reproduction control information specific to the recording format of the video data, and information obtained by converting the unique reproduction control information into a general-purpose format independent of the recording format, the unique reproduction control information Reading the common reproduction control information from the recording medium on which the common reproduction control information to which the inspection information for verifying the identity is added is recorded;
Verifying the specific reproduction control information based on the inspection information added to the read common reproduction control information;
Performing the reproduction process of the video data according to the read common reproduction control information when the unique reproduction control information is verified;
A video playback method comprising: