JP2008310889A - Recording / playback device - Google Patents

Abstract

When entire management information is backed up for each generation, storage capacity is required, and restoration in units of files becomes difficult.
A file system that manages video data recorded on a first recording medium using arrangement information on the first recording medium, records the video data on the first recording medium, and updates the arrangement information. A restoration data creation unit that extracts the placement information of the video data from the placement information and creates it as restoration data, a recording unit that records the restoration data together with the low bit rate video data on the second recording medium, and a first A restoration unit that reads restoration data corresponding to the video data recorded on the recording medium from the second recording medium and restores the arrangement information of the video data.
[Selection] Figure 1

Description

  The present invention relates to a recording / reproducing apparatus for recording video data and file management information as a file on a recording medium, and particularly to recovering management information when the format of the recording medium or deletion of video data is mistakenly performed. The present invention relates to a recording / reproducing apparatus that can perform recording.

  In recent years, content such as video data and audio data obtained by a digital video camera or the like is recorded as a file on a recording medium such as a flash memory, an optical disk, or a magnetic disk. In such a device, the user can select and delete the content photographed, or format the recording medium easily. Therefore, the user may accidentally delete important contents or format the recording medium. In such a case, a mechanism that can restore the content is required.

  Normally, when deleting files or formatting a recording medium, it takes a long time to erase all the target data, and when the recording medium is a medium with a limited number of writes, such as a flash memory, the number of writes In order to reduce the file data, the file data is not actually erased, and the data area portion that is the target in the management information for managing the arrangement of the data on the recording medium is made unused. In such a case, since the file data itself still exists on the recording medium, if the management information can be restored, these can be referred to again as a file in the deleted file or the formatted recording medium.

As a conventional method for restoring management information, before updating the management information, the management information to be updated is backed up in a backup area provided in the nonvolatile memory, and when the restoration is restored, the backed up management information is written back. There is a technique to perform (see Patent Document 1).
JP 2005-115856 A

  The above-described method is a recovery method for sudden power interruption during processing such as writing, and the entire management information is backed up. Therefore, in order to save the management information for each update, that much storage capacity is required. In addition, since the state of all the files on the recording medium returns to the backup point, it becomes difficult to restore in units of files.

  In view of the above problems, an object of the present invention is to make it possible to restore a file with a configuration with a small storage capacity and easy management.

  The above problems are solved by the present invention described below. That is, the recording / reproducing apparatus according to the present invention records the video data as a file on the first recording medium, and creates low bit rate video data having a lower bit rate than the video data from the video data and performs the second recording. A recording / reproducing apparatus for recording on a medium, managing video data recorded on a first recording medium using arrangement information on the first recording medium, and recording the video data on the first recording medium A file system for updating the arrangement information, a restoration data creation unit for extracting the arrangement information of the video data from the arrangement information and creating it as restoration data, and recording the restoration data together with the low bit rate video data on the second recording medium Read the restoration data corresponding to the video data recorded on the first recording medium and the recording unit from the second recording medium, and restores the arrangement information of the video data That has a restoration unit, a.

  According to the recording / reproducing apparatus of the present invention, only the arrangement information necessary for restoring the video data is backed up in the low bit rate video data, so that the storage capacity is small and the arrangement information of the video data is abnormal, Even if the video data is deleted on the file system, the restoration data recorded together with the low bit rate video data corresponding to the video data will be saved unless the data area where the video data was written is overwritten with another data. The video data can be accessed by reading and restoring the arrangement information of the video data. Management is also facilitated by adding video data arrangement information to proxy data that is closely related to video data.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus 100 according to Embodiment 1 of the present invention. The recording / reproducing apparatus 100 includes a system control unit 101, a recording medium 110, a recording medium 111, an input unit 120 that receives an instruction from a user, a video / audio input unit 121 that inputs a video signal and an audio signal, and a video signal. Encoder High 122 and encoder Low 123 for encoding video signals and audio signals, decoder 125 for decoding video signals and audio signals, video / audio output means 124 for outputting decoded video signals and audio signals, and video And an LCD monitor 126 for displaying data thumbnails and the like.

  The system control unit 101 is realized by a computer including a CPU and a memory, for example. The system control unit 101 includes a clip file processing unit 102, an arrangement information processing unit 103, a GUI (Graphical User Interface) processing unit 104, a recording buffer memory 105, a reproduction buffer memory 106, a file system 107, and a file system memory 108. I have. Each means included in the system control unit 101 is realized by executing various programs by the CPU. As each memory included in the system control unit 101, for example, a memory may be used for each application, or a single memory may be realized by dividing an area for each application.

  The file system 107 in the system control unit 101 manages files in units of blocks and has arrangement information of blocks in which the files are recorded. For example, a FAT (File Allocation Table) file system is preferable. In the FAT file system, data is managed in blocks called clusters, and the file name, creation date / time, file attribute, file size, starting cluster, and the like can be acquired from information called directory entries for files and directories. In addition, information such as the position and order of clusters used by the file is recorded in a table that manages the arrangement of data called a FAT table. In the first cluster in the data area, a directory entry of a file or directory in the highest directory called a root directory entry is recorded. Similarly, in the start cluster acquired from the directory entry of the directory, the directory entry of the file or directory in the directory is recorded. Based on this information, files and directories can be referenced.

  The recording medium 110 is preferably removable and has a high transfer rate. For example, a P2 (Professional Plug-in) card, which is a semiconductor medium, can transfer data of up to 640 Mbps and is suitable as a recording medium for a video camera for broadcasting business. Further, it is preferable that the recording medium 111 is detachable and cheaper than the recording medium 110. For example, an SD (Secure Digital) memory card, which is a semiconductor medium, is suitable for use in digital cameras and the like because it is widely used and its price is decreasing year by year.

  Each of the recording medium 110 and the recording medium 111 is formatted by a file system such as FAT, and writing of a file to each recording medium is performed by updating the FAT table and writing data by the file system 107 in the system control unit 101. Done.

  The video signal input from the video / audio input means 121 is sequentially compressed by the encoder High 122 at a high resolution that can be used for broadcasting to be high resolution encoded data. The high-resolution encoded data is filed in the MXF (Material Exchange Format) format by the clip file processing means 102 and recorded on the recording medium 110 by the file system 107.

  At this time, the clip file processing unit 102 creates the first frame data of the high resolution encoded data as a thumbnail image which is an image file in the bitmap format, and the file system 107 records this on the recording medium 110 and the recording medium 111. To do. The thumbnail image data is displayed on the LCD monitor 126 as a thumbnail list. The thumbnail image data makes it easy to find a desired video from a recording medium. Therefore, the image size does not need to be large and is compressed to image data of 80 bits vertically, 60 pixels horizontally, and 24 bits per pixel.

  Also, the audio signal input from the video / audio input means 121 is compressed by the encoder High 122 to be high-quality audio data. The high sound quality audio data is filed in the Wave format by the clip file processing means 102 and recorded on the recording medium 110 by the file system 107.

  Note that video data and audio data are in separate files. When editing for business purposes such as broadcasting stations, video and audio are often edited independently. This is because it is common to create a separate file for audio and audio. A combination of the video file and the audio file is called a clip.

  The clip file processing unit 102 creates clip management information for managing and associating information such as a frame rate and the number of frames of video data and audio data, and a duration in which the size of the data is represented by the number of frames. File in text format. Clip management information is also recorded on the recording medium 110 and the recording medium 111 by the file system 107. The clip includes clip management information.

  Similarly, the video signal input from the video / audio input means 121 can be transmitted / received to / from a remote editing apparatus or the like without stress by wireless or wired, etc., according to the MPEG (Moving Picture Experts Group) format by the encoder Low 123. Therefore, the data is sequentially compressed at a lower resolution than the high-resolution encoded data so as to obtain low-resolution encoded data. The low-resolution encoded data is filed by the clip file processing unit 102 and recorded on the recording medium 111 by the file system 107.

  In addition, the encoder Low 123 compresses the audio signal input from the video / audio input unit 121 as necessary to obtain low sound quality audio data having a compression rate higher than that of the high sound quality audio data. The low sound quality audio data is filed in the Wave format by the clip file processing means 102 and recorded on the recording medium 111 by the file system 107.

  Low-resolution encoded data (and low-quality audio data) is called proxy data. Note that the video signal and the audio signal may be multiplexed into one low-resolution encoded data by the encoder Low 123 and recorded as proxy data on the recording medium 111. In the following description, it is assumed that proxy data includes low-resolution encoded data, clip management information, thumbnail image data, and restoration data, which are respectively proxy video data, proxy clip management information, proxy thumbnail image data, and proxy restoration. Called data.

  Proxy data is data for performing so-called non-linear editing, which is generally performed in recent years, and is taken into a personal computer or the like and then used as editing material. In other words, when nonlinear editing is performed on a personal computer or the like, the processing capability is insufficient, and main line data composed of high-resolution encoded data and high-quality audio data as described above cannot be directly used as editing material. There is. In this way, editing performed using proxy data as a material may be referred to as proxy editing. This proxy editing is performed as simple editing at a shooting site, for example. The result of proxy editing is delivered to a studio apparatus or the like that creates final broadcast data in a state of being recorded on an SD memory card or the like, or transmitted via a network. Then, in the studio, the main line data is edited based on the result of the proxy editing, and the final broadcast content is created. Therefore, it can be said that proxy data is closely related to main line data.

  The arrangement information processing means 103 creates the arrangement information of each file constituting the clip in the recording medium 110 as proxy restoration data based on the FAT table of the recording medium 110, converts the file into a file by the clip file processing means 102, and Data is recorded on the recording medium 111 by the file system 107.

  The creation of proxy restoration data will be described with reference to FIG. The clip file includes a clip management information file, a thumbnail image file, a video file, and an audio file. FIG. 2E shows an example of the state of a part of the data area of the recording medium 110. Each file is recorded in the data area for each cluster. Each cluster is assigned a cluster number in order. FIG. 2D shows the state of a portion corresponding to FIG. 2E in the FAT table of the recording medium 110. The FAT table corresponds to a cluster in the data area for every fixed size (32 bits in FAT32), and 00h representing unused is recorded when no data is recorded in the corresponding cluster. When data is recorded, a cluster number in which subsequent data is recorded is recorded. When the data recorded in the cluster is the end, an EOF indicating the end is recorded.

  First, the clip file portion is extracted from the FAT table of FIG. 2D as data that is the source of proxy restoration data from the recording medium 110. Here, the file portion not related to the clip is replaced with 00h indicating unused. The proxy restoration data created in this way is uncompressed data. FIG. 2 (c) shows the state of the uncompressed data.

  In addition, when video / audio data is recorded every several frames, a recording pattern can be determined. For example, when the data size of one frame of video data to be recorded is 288000 bytes and the data size of one frame of audio data is 3840 bytes, the data size of the video data is 75 times the data size of the audio data. At this time, if the audio data is accumulated in the recording buffer memory 105 until it reaches one cluster size and written to the recording medium when the one cluster size is reached, the video data is written for 75 clusters. Audio data is written for one cluster. For the sake of explanation, FIG. 2 shows an example in which a clip management information file and a thumbnail image file are first recorded as recording patterns one cluster at a time, and thereafter, a video file has 3 patterns and an audio file has 2 patterns. The recording pattern depends on the recording rate and the number of audio channels. For example, since the size of video data of 50 Mbps is doubled compared to video data of 25 Mbps, the ratio of video data and audio data changes. As the number of audio channels increases, the number of files increases. This can be said that if the recording pattern for each recording format is standardized among devices, the recording pattern can be known from the recording format. If the recording pattern is determined in this way, if you know the recording pattern, the top cluster number where the video and audio files are recorded, the size of each file, and the use / unuse of each cluster The FAT table can be restored. Therefore, the size of the proxy restoration data can be reduced by converting the clip file portion in the FAT table into a bitmap so that the used portion is set to 1 and the unused portion is set to 0. The proxy restoration data created in this way becomes bitmapped data. FIG. 2B shows the state of this bitmapped data.

  Furthermore, video / audio data is often recorded in a continuous free area in order to improve the recording speed. In such a case, since the used clusters are continuous, the efficiency is improved by performing compression using RLE (Run Length Encoded). RLE is a method of compressing data by expressing it by the number of consecutive codes when the same codes are continuously arranged in the data. The proxy restoration data created in this way becomes RLE data. FIG. 2A shows the state of the RLE data. The compression method may be other reversible methods than RLE.

  Which type of proxy restoration data is created is determined by the clip recording format. For example, in a recording format that performs inter-frame compression, the size of a video with little motion is smaller than that with a lot of motion, so the ratio between video data and audio data varies. In the case of such a recording format, the uncompressed data is used as proxy restoration data. Further, even when the cluster numbers of the clusters that record the clips are not always in ascending order, the uncompressed data is used as proxy restoration data.

  In a recording format in which intra-frame compression is performed and the size of the frame data is fixed, the recording pattern can be determined as described above. At this time, if the recording can be performed so that the cluster numbers of the clips to be recorded are in ascending order, and the recording rate is low and there is no need to record the clip data in a continuous free area, the clip data is recorded. Since the data of other files is often recorded between the existing clusters, the bitmapped data is used as proxy restoration data. Further, when recording is performed in a continuous free area with a high recording rate, the RLE data is used as proxy restoration data.

  In the following description, it is assumed that the proxy restoration data is RLE data compressed by RLE.

  Based on the proxy restoration data created by the above method, a proxy restoration data file is created by the clip file processing means 102. Information necessary for restoring the FAT table is recorded in the proxy restoration data file. FIG. 3 is a diagram showing a data structure of the proxy restoration data file. As shown in FIG. 3, the proxy restoration data file is recorded as a text file, and each element constituting the proxy restoration data file is surrounded by tags. For example, the element surrounded by the MediaID tag is the serial number of the recording medium 110 on which the clip is recorded, and is used to specify the recording medium. The element enclosed by the StartCluster tag indicates the first cluster number in which the clip file is recorded. In the case of the clip file recording arrangement of FIG. 2, the cluster number in which the clip management information file is recorded is “ 06h "is recorded. Elements surrounded by the “Pattern” tag indicate a recording pattern, and the elements surrounded by the “Video” and “Audio” tags indicate the number of clusters to be recorded. Note that if the recording pattern for each recording format is unified between the device that creates the proxy restoration data and the device that restores from the proxy restoration data, the Pattern tag is not necessary. The element enclosed in the Table tag indicates the proxy restoration data, the element enclosed in the Type tag indicates the data format, and the element enclosed in the Data tag indicates the proxy restoration data created above. Is recorded. Here, RLE data compressed by RLE is recorded. In addition, although the example of the text format was shown in FIG. 3, it is good also as a file of a binary format.

  Next, a method for restoring main line data using a proxy restoration data file will be described.

  FIG. 4 is a flowchart of the clip arrangement information restoring method. In step S 401, proxy data is read from the recording medium 111, and the proxy thumbnail image list is displayed on the LCD monitor 126 by the GUI processing unit 104. The user moves the cursor displayed on the LCD monitor 126 by the GUI processing means 104 through the input means 120 and selects proxy data. The proxy video data of the selected proxy data is read through the file system 107 and stored in the reproduction buffer memory 106. The data in the reproduction buffer memory 106 is decoded by the decoder 125 and then output by the video / audio output means 124. The user selects proxy data for video data to be restored by checking the output video / audio.

  In step S402, the proxy restoration data is read from the proxy restoration data file of the selected proxy data, and is decoded by the arrangement information processing means 103 so as to become the data of the FAT table of the video data. Here, the decoding method will be described with reference to FIG. First, in FIG. 5, it is easy to decode the RLE data shown in FIG. 2A into the bitmapped data in FIG. That is, after reading one value and obtaining the length, the subsequent data is written for the length. By continuing thereafter, it can be decoded into bitmapped data.

  Next, the file system 107 reads the first cluster number of the clip from the proxy restoration data file, and assigns a cluster number to each bit of the bitmapped data as shown in FIG. Furthermore, by reading the recording pattern from the proxy restoration data file, each file can be associated with the used portion of the bitmapped data. Since the cluster number and the file can be associated with each bit, it is possible to decode the original FAT table data into the uncompressed data as shown in FIG. 5 by connecting the cluster chain in each file. it can.

  The recording pattern is not recorded in the proxy restoration data file, and the recording pattern for each recording format is unified between the device that creates the proxy restoration data and the device that restores from the proxy restoration data. If so, the recording pattern and the number of audio channels are acquired from the proxy clip management information file to determine the recording pattern.

  Here, the main line data and proxy data files are arranged under a directory structure as shown in FIG. The main line data is recorded on the recording medium 110, and the proxy data is recorded on the recording medium 111. The names of the main line data files and the proxy data files (the left side of the extension constituting the file name) are unified for each clip, and the extensions are changed according to the file format. For example, in FIG. 6, the clip name is “0001”, and the proxy video file of this clip is “0001.mp4”. Therefore, even if the clip is deleted or the recording medium 110 is formatted and the file name of each clip of the main line data becomes unknown, the file name can be restored from the proxy data. Further, the size of each file of the main line data clip can be acquired by referring to the proxy clip management information file. That is, the duration D (frame) indicating the total number of frames of the clip, the recording rate R (bit / second) of the main line data, and the frame rate F (frame / second) can be acquired from the proxy clip management information file, and the file size S ( Bit) can be calculated by S = D / F × R. The proxy clip management information file and the proxy thumbnail image file are the same as the clip management information file and the thumbnail image file recorded in the main line data. If there is no proxy clip management information file, it is necessary to record the file size of each file or the duration, recording rate, and frame rate required to determine the file size when recording proxy restoration data. is there.

  Next, the directory entry will be described. The directory entry indicates directory and file information, and the name of the directory and file, the top cluster number in which data is recorded, the data size, the creation date and time, and the like are recorded. The directory at the top level of the directory structure is called a root directory. Directory entries for directories and files in this directory are recorded in a cluster having a cluster number of 02h in the case of FAT32 (in the case of FAT12 and FAT16, the root directory). There is a dedicated area). FIG. 7 shows directory entry information in the directory structure of FIG. (A) In the cluster number 03h indicated by the directory entry for the CONTENTS directory in the root directory, the directory entry for the directory or file in the (b) CONTENTS directory is recorded. By doing the same, it is possible to refer to (c) VIDEO directory, (d) AUDIO directory, and the like. Each cluster number indicated by the directory entry for the file records the data of the file. Here, when the clip is deleted, the directory entry of each file of the clip is deleted. When the recording medium is formatted, (a) all directory entries in the root directory are deleted. When a directory is created, all directory entries in the directory are deleted. Therefore, when a directory below the CONTENTS directory is created again, all directory entries for clip files are deleted. Therefore, to restore the clip file, it is necessary to restore the directory entry of the clip file. Information necessary for file access in the directory entry is a file name, a file size, and a start cluster, and these information are recorded in the proxy. Therefore, the directory entry for the clip file can be restored by reading the information from the proxy restoration data file by the file system 107. Information such as creation date and time may be recorded as the date and time when the data is restored. If necessary, a tag such as CreateDate is additionally recorded and the information is read when the proxy restoration data file is recorded. You may restore it. As described above, the clip arrangement information can be restored from the proxy restoration data file.

  Next, in step S403, when the FAT table of the video data restored in step S402 is rewritten to the FAT table of the recording medium 110, it is confirmed that the rewriting destination is “unused” on the FAT table. If it is “unused”, the process proceeds to step S406. If it is not “unused”, there is a possibility that other data is recorded in the area where the video data was recorded, so the process proceeds to step S404, and an error is output to the user. Thereafter, in step S405, the user is inquired whether to continue the process. When not continuing, the process is terminated. When continuing, it progresses to step S406.

  In step S406, the video data is read from the recording medium 110 using the FAT table of the video data restored in step S402, and the video is reproduced. At this time, since the format standards of the video file and the audio file are known, the format of each file is checked, and if it does not match the format standard, another data may be recorded in the video data recording area. Therefore, the process proceeds to step S407, an error is output, and the process is terminated. If they match, the process proceeds to step S408.

  In step S408, the user is inquired whether to write back the FAT table of the video data created in step S402 to the FAT table of the recording medium 110. If not written back, the process is terminated. In the case of writing back, the process proceeds to step S409, and the FAT table of the video data created in step S402 is written back to the FAT table of the recording medium 110. At this time, the unused portion in which the value of the FAT table of the video data restored in step S402 is 0 is not written back. Further, as described above, the directory entry is repaired and the process is terminated.

  Note that if the directory entry cannot be repaired or if it is not desired to write back the FAT table, the FAT table of the video data restored in step S402 is used as the other recording medium not shown in FIG. The read data may be recorded as a new file.

  By performing the above steps, it is possible to restore a clip from a recording medium that has been accidentally formatted or deleted.

  In the above example, proxy data is recorded on a recording medium mounted on the recording / reproducing apparatus. However, the proxy data may be recorded on a recording medium of another device at the network destination via a wireless LAN or a wired LAN. Further, although the proxy restoration data is individually recorded as a file, it may be incorporated into a proxy video file or the like. For example, when a proxy video file is recorded in the MPEG4 file format, the MPEG4 file format has an object structure and is composed of several boxes, and user data called a free space box or skip box in the box. In addition, since there is a box for storing padding data for padding, proxy restoration data may be recorded in that area.

(Embodiment 2)
In the first embodiment, the method for restoring management information when there is an abnormality in the management information of the video file using the proxy restoration data has been described. However, in the second embodiment, the proxy restoration data is used as the video restoration information. A method used as information for data reproduction and video data acquisition will be described.

  FIG. 8 is a diagram showing a schematic configuration of a broadcasting system in which the second embodiment is used. The recording / reproducing apparatus 100 in FIG. 8 has the same configuration as that of the recording / reproducing apparatus of the first embodiment, and high-resolution main line data is recorded on the recording medium 110, and low-resolution proxy data is recorded on the recording medium 111. To be recorded.

  The editing terminal 800 performs proxy editing, and connects the recording medium 111 to a recording medium I / F (not shown) to read proxy data. The proxy data may be transferred via a network such as a wireless LAN.

  The data server 820 is a server for backing up video data captured by the recording / reproducing apparatus 100 and has a control unit equivalent to the system control unit 101. The recording medium 110 is connected to a recording medium I / F (not shown), the data is read, and copied to the recording medium 830 connected to the data server 820. Note that the recording medium 830 preferably has a large capacity, and a hard disk or the like is suitable.

  Here, a method of copying data from the recording medium 110 to the recording medium 830 will be described with reference to FIG. Management information of a file including a FAT table is recorded in the management area 110a, and data is recorded in the data area 110b. That is, the data area 110b is a cluster group indicated by the FAT table.

  The data area 110 b is image copied to the recording medium 830 by the file system 107. Note that image copy is also called physical copy, and the physical layout is also copied by sequentially reading the area of the recording medium and writing it to the copy destination recording medium. That is, all data in the data area 110b is copied without changing the physical arrangement of the data, and recorded as an image file 830a. At this time, identification information indicating that the data is from the recording medium 110 is added. For example, the serial number of the recording medium 110 with an extension is used as the file name of the image file. When the serial number is “0703233001”, the file name is “0703233001.img”.

  As described above, video data is accumulated in the data server 820.

  A network 810 is a network such as the Internet or an intranet, and enables communication between the editing terminal 800 and the data server 820. When the proxy editing is completed, the editing terminal 800 transmits the editing information and proxy restoration data to the data server 820 via the network 810.

  The data server 820 holds the received proxy restoration data in the file system memory 108. As described above, since the serial number for identifying the recording medium is recorded in the proxy restoration data while being recorded by the recording / reproducing apparatus 100, it is recorded by the file system 107 by the file system 107. Take out the serial number. For the image file 830a having a file name corresponding to the serial number, video data is read based on the file arrangement information of the proxy restoration data. That is, the file system 107 restores the FAT table and directory entry of the clip file from the proxy restoration data in the same manner as in the first embodiment. The restored FAT table and directory entry are held in the file system memory 108. Since the image file 830a is recorded without changing the physical arrangement of the recording medium 110, the clip file can be referred to by using the restored FAT table and directory entry. The video data read in this way can be transmitted to the editing terminal 800, edited based on the received editing information, and broadcast (on-air). In the above description, the image file 830a is created by copying only the data area 110b without copying the management area 110a to the recording medium 830. As a result, the capacity for the management area 110a can be saved, and clip data can be referred to only when proxy restoration data is used, so that reference from a third party can be prevented.

  As described above, the proxy restoration data can be used as information for reproduction of video data and acquisition of video data. This is also effective in the following cases.

  Normally, to access a file, the first cluster number is referred to from the arrangement information, and the cluster is accessed. To access the next cluster, the next cluster number is referred to from the arrangement information again, and the cluster is accessed. By repeating this in order, the file can be accessed. Therefore, in order to refer to the cluster, a seek process between the arrangement information and the cluster occurs. In general, in order to avoid this seek process, the placement information is read into a memory such as the file system memory 108, and the seek process is avoided by referring to this information. However, if a sufficient memory capacity cannot be prepared, such as an embedded device, all the arrangement information is not read into the memory, and only a necessary part is read at a certain size. Therefore, when there is no arrangement information to be referenced in the memory, it is necessary to read from the recording medium, and seek processing occurs.

  On the other hand, in the present invention, only arrangement information relating to main line data to be acquired is recorded in the proxy data in advance as proxy restoration data. The proxy restoration data is smaller in size than the entire arrangement information, and the main line data can be acquired if the proxy restoration data can be read into the memory and referenced.

  In the recording / reproducing apparatus according to the present invention, by backing up the arrangement information for each video data, the data area in which the video data has been written can be restored unless overwritten with another data. Since management is facilitated by adding video data arrangement information to deep proxy data, it is also effective in a recording / reproducing apparatus or the like that records video for proxy editing in a later process.

The figure which shows the structure of the recording / reproducing apparatus of Embodiment 1 of this invention. The figure for demonstrating the data creation method for arrangement | positioning information restoration of clip data in Embodiment 1 of this invention The figure which shows the data structure of the data file for proxy restoration in Embodiment 1 of this invention Flowchart of clip arrangement information restoring method according to Embodiment 1 of the present invention The figure for demonstrating the arrangement information restoration method of the clip data in Embodiment 1 of this invention The figure which shows the directory arrangement | positioning of the clip in Embodiment 1 of this invention The figure which shows the directory entry information in the directory structure in Embodiment 1 of this invention. The figure which shows schematic structure of the broadcast system of Embodiment 2 of this invention. The figure for demonstrating the copy method of the video data in Embodiment 2 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Recording / reproducing apparatus 101 System control part 102 Clip file processing means 103 Arrangement information processing means 104 GUI processing means 105 Recording buffer memory 106 Playback buffer memory 107 File system 108 File system memory 110 Recording medium 111 Recording medium 120 Input means 121 Video / Voice input means 122 Encoder High
123 Encoder Low
124 video / audio output means 125 decoder 126 LCD monitor

Claims (3)

A recording / reproducing apparatus that records video data as a file on a first recording medium, creates low bit rate video data having a lower bit rate than the video data from the video data, and records the video data on a second recording medium. And
A file for managing video data recorded on the first recording medium using arrangement information on the first recording medium, recording the video data on the first recording medium, and updating the arrangement information System,
A restoration data creation unit that extracts the placement information of the video data from the placement information and creates it as restoration data;
A recording unit for recording the restoration data together with the low bit rate video data on the second recording medium;
A restoration unit that reads the restoration data corresponding to the video data recorded on the first recording medium from the second recording medium and restores the arrangement information of the video data;
A recording / reproducing apparatus. The file system manages recorded video data in units of a predetermined size block,
The restoration data creation unit extracts the arrangement information of the video data from the arrangement information, and converts the video data into the bitmap data that indicates whether the video data is recorded on the first recording medium in units of blocks. The recording / reproducing apparatus according to claim 1, wherein the data is converted into the restoration data. The recording / reproducing apparatus according to claim 2, wherein the restoration data creation unit further compresses the bitmap data to obtain the restoration data.