JP6530354B2 - Video content storage system, video content storage method, and video content storage program - Google Patents

Description

  The present invention relates to a video content storage system, a video content storage method, and a video content storage program.

  Data compression techniques are used to reduce the size of the video data. Compression of video data can be roughly classified into two types, lossless compression in which the video data before compression is completely restored, and lossy compression in which the compression ratio can be increased but which contains some errors. In cases where original video content is to be stored faithfully, such as storage of original video content, lossless compression with guarantee of reversibility is used. The latest video coding standard HEVC also supports lossless compression of video by setting parameters (see, for example, Non-Patent Document 1).

Gary J. Sullivan, Jens-Rainer Ohm, Woo-Jin Han, Thomas Wiegand, "Overview of the High Efficiency Video Coding (HEVC) Standard", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, Vol. 22, No. 12, No. 12, December 2012

  By the way, when video content is stored, it is possible to save the storage capacity by compressing the data to reduce the storage capacity and then storing it. However, actual video content is stored not only as video data but also in a containerized form with various header information such as time stamps and audio information. As described above, it is not possible to increase the compression ratio even if lossless compression is performed on the video content containerized with various information as one content using the general lossless compression method ZIP format or the like. There is a problem of In addition, in the case of lossless compression of video content, it is conceivable to apply image compression such as HEVC, but since there is no scheme for storing storage area information etc. of data other than video data, files of video content There is also the problem that it can not be undone in a perfect match.

  The present invention has been made in view of such circumstances, and it is possible to perform lossless compression to increase the compression ratio when storing video content, and to completely restore video content when compressed. It is an object of the present invention to provide a video content storage system, a video content storage method, and a video content storage program.

  One aspect of the present invention is a video content storage system for storing video content including video data and non-video data which is not video data, comprising: a video content input unit for inputting the video content to be stored; The video data and the non-video data are extracted from the video content, and the same type of data is combined as a series of data for each of the extracted video data and the non-video data, and the combined data is obtained. A data compression unit that compresses the video data and the non-video data by performing lossless compression of the corresponding data, the arrangement order of the video data and the non-video data in the video content, and the size of each data A video data storage area information compression unit for performing lossless compression of the defined video data storage area information; The video data and video out data compressed by the compression unit, a video content storage system that includes a data storage unit that stores the compressed video data storage area information by the image data storage area information compression unit.

  One aspect of the present invention is the video content storage system, wherein the video data storage unit stores the video data, the non-video data, and the video data storage area information stored in the data storage unit, and decodes the read data and the video data storage area information, respectively. A video content restoration unit that restores the video content by reproducing the arrangement order of the video data and the non-video data of the video content before compression with reference to the decoded video data storage area information And more.

  One aspect of the present invention is the video content storage system, wherein the data storage unit stores the video data, the non-video data, and the video data storage area information by the video content restoration unit. The video content is restored, the hash value of the video content and the hash value of the input video content are calculated, and if the two hash values match, the compressed video data, the non-video data, The video data storage area information is stored, and if the two hash values do not match, the video content is stored without being compressed.

  One aspect of the present invention is the video content storage system, wherein the property detection unit detects a file property of the input video content, and the file property of each data after compression is detected by the property detection unit. And a property rewriting unit that rewrites the file property.

  One aspect of the present invention is a video content storage method performed by a video content storage system for storing video content including video data and non-video data which is not video data, and the video for inputting the video content to be stored The video data and the non-video data are extracted from the content input step, and the input video content, and the same kind of data is combined as a series of data for each of the extracted video data and the non-video data. And a data compression step of compressing the video data and the non-video data by performing lossless compression of data according to the combined data, and an arrangement order of the video data and the non-video data in the video content And lossless compression of video data storage area information defining the size of each data Data for storing image data storage area information compression step, video data and non-video data compressed in the data compression step, and video data storage area information compressed in the video data storage area information compression step in a storage unit It is a video content storage method having a storage step.

  One aspect of the present invention is the video content storage method, wherein the video data, the non-video data, and the video data storage area information stored in the data storage step are read out and decoded respectively. A video content restoring step of restoring the video content by reproducing the arrangement order of the video data and the non-video data of the video content before compression with reference to the decoded video data storage area information And further.

  One aspect of the present invention is a video content storage program for causing a computer to function as the video content storage system.

  According to the present invention, compression is performed using a lossless compression method according to the type of data making up the video content, so that it is possible to achieve significant saving of the storage capacity of storage. In addition, when video content is compressed, it is possible to obtain an effect that it can be restored in a form of perfect match.

It is an explanatory view showing an outline of processing of the present invention. It is a block diagram which shows the structure of the compression part (video content compression part 1) of the video content storage system in 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the video content storage system shown in FIG. It is a block diagram which shows the detailed structure of the video data storage area | region information calculation parts 5 and 7 shown in FIG. It is a block diagram which shows the structure of the decoding part (video content decoding part 31) of a video content storage system. It is a flowchart which shows operation | movement of the video content decoding part 31 shown in FIG. It is a block diagram which shows the structure which performs the video content storage process in the video content storage system by 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the video content storage system shown in FIG. It is a block diagram which shows the structure which performs the return process in the video content storage system by 2nd Embodiment. It is a flowchart which shows operation | movement of the return process of the compression data in the video content storage system shown in FIG.

First Embodiment
Hereinafter, a video content storage system according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an outline of the process of the present invention. The video content to be stored used in the present embodiment has header information added to its head, and audio 1 which is non-video data and video 1 which is video data follow. As shown in FIG. 1, the video content handled in the present embodiment is a data format in which audio and video are alternately arranged following the header information. Here, as shown in FIG. 1, the video content is an example in which the audio and the video are alternately arranged, but the header information is followed by the video and the audio is arranged first. It may be In addition, following to the header information, it may be video contents or the like in which one of audio or video is arranged in the first half and the other is arranged in the second half. The header information is part of non-video data.

  The video content storage system confirms the type of video content by reading the header information, and obtains information on how the audio and video are arranged according to the type. Then, as shown in FIG. 1, the video content storage system generates three data of video data, non-video data, and video data storage area information. The video data is obtained by extracting only the video from the video content and arranging and combining them in order. Further, the size of each video data is p1, p2,..., PN (N is a natural number). The non-video data is obtained by extracting only the audio, which is non-video data, at the beginning of the header and arranging and combining them in order. Also, let the size of each data be n1, n2, ..., nN.

  The video data storage area information is information in which the arrangement order of data, the size of video data, the size of non-video data (header), and the size of non-video data (audio) are arranged in order. However, if the arrangement order of the video and the audio is always constant, it may not be stored. Therefore, two of pN and nN are stored as video storage area information (1) and (2), respectively. At that time, pN and nN do not store the numerical values as they are, but store the difference between adjacent values.

  For example, regarding pN, p1, p2-p1, p3-p2,. Regarding nN, n1, n2-n1, n3-n2,. The reason for taking adjacent differences is that adjacent values of each data are likely to be close, and compression of data size can be expected rather than using pN or nN as they are.

  Then, the video content storage system compresses each data (video data, non-video data, video data storage area information (1), (2)) thus obtained by the lossless compression. The compression method used at this time uses a compression method that matches the data to be compressed. As a lossless compression method of video data, for example, international standard HEVC can be applied. Further, as a method of compressing the non-video data and the video data storage area information, for example, the ZIP format is applicable.

<Compression process>
Next, the configuration of the compression portion (video content compression unit 1) of the video content storage system in the embodiment will be described. FIG. 2 is a block diagram showing the configuration of the compression portion (video content compression unit 1) of the video content storage system in the embodiment. The video content compression unit 1 shown in FIG. 2 includes a video data extraction unit 2, two binary data compression units 3, 6, 8, a video lossless compression unit 4, and two video data storage area information calculation units 5 and 7. .

  The video data extraction unit 2 separates the input video content into non-video data and video data and outputs them. The binary data compression units 3, 6 and 8 losslessly compress input binary data. The image lossless compression unit 4 losslessly compresses the image. The video data storage area information calculation units 5 and 7 receive video data or non-video data sent one by one from the video data extraction unit 2, calculate video data storage area information, and send them to the binary data compression units 6 and 8. send.

  Next, with reference to FIG. 3, the operation of the video content storage system shown in FIG. 2 will be described. FIG. 3 is a flowchart showing the operation of the video content storage system shown in FIG.

  First, the video data extraction unit 2 receives video content (step S1). Then, the video data extraction unit 2 disassembles the video content (step S2).

  Next, the video data extraction unit 2 reads only the video content from the top and takes out video data (video N). At that time, the lengths (sizes) p1, p2,..., PN of the respective video data are measured (step S3). In addition, the video data extraction unit 2 also creates non-video data (header and audio) in which video data is deleted from the video content, and at that time, the lengths (sizes) n1, n2,. It measures (step S4). Subsequently, the separated video data and non-video data are respectively combined to generate video data and non-video data.

  Next, the video data storage area information calculation unit 5 calculates the difference D1 = p1, D2 = p2-p1, D3 = p3-difference between adjacent data with respect to the lengths p1, p2, p3,. p2 and so on are obtained and set as video data storage area information (1). Further, the video data storage area information calculation unit 7 calculates the difference d1 = n1, d2 = n2-n1, d3 = n3-n2 between adjacent data with respect to the lengths n1, n2, n3,. .. To obtain video data storage area information (2) (step S5).

  Three binary data compression units 3, 6, 7 and so on. The image lossless compression unit 4 compresses each of these data (image data, non-image data, image data storage area information (1) and (2)) using lossless compression. , Generate compressed data (step S6).

  Finally, the video content storage system outputs compressed video data, compressed video data, compressed video data storage area information (1), compressed video data storage area output from the video content compression unit 1 Store information (2) as one container.

  Next, the detailed configuration of the video data storage area information calculation units 5 and 7 shown in FIG. 2 will be described with reference to FIG. FIG. 4 is a block diagram showing a detailed configuration of the video data storage area information calculation units 5 and 7 shown in FIG. Since the video data storage area information calculation unit 5 and the video data storage area information calculation unit 7 have the same configuration, the video data storage area information calculation unit 5 will be described here. The video data storage area information calculation unit 5 includes a data length calculation unit 9, a holding memory 10, and a subtractor 11.

  The data length calculation unit 9 obtains the data length of each video data (in the case of the video data storage area information calculation unit 7, non-video data), and sends the data length to the holding memory 10 and the subtractor 11. When the data length is input from the data length calculation unit 9, the holding memory 10 outputs the currently held value to the subtractor, and overwrites the held value with the inputted data length value. The initial value is 0. When the data length and the holding result of the holding memory 10 are input, the subtractor 11 calculates the difference between the data length and the holding result of the holding memory 10, and the binary data compression unit 6 (in the case of the video data storage area information calculation unit 7) , Binary data compression unit 8). By using such a configuration, the video data storage area information calculation units 5 and 7 can be realized.

<Decryption process>
Next, with reference to FIG. 5, the configuration of the decoding portion (video content decoding unit 31) of the video content storage system that decodes these four compressed data and restores the original video content will be described. FIG. 5 is a block diagram showing the configuration of the decoding portion (video content decoding unit 31) of the video content storage system.

  The video content decoding unit 31 shown in FIG. 5 includes three binary data decoding units 32, 35, 40, a video decoding unit 37, a non-video data division unit 36, a decoded video division unit 38, and two adders 34, 41, 2 It consists of two holding memories 33 and 42 and a decoded data integration unit 39.

  When performing the decoding process, the video content storage system unpacks the container of the video content to be stored which is to be decoded, and divides the container into four compressed data. The binary data decoding unit 32 decodes the compressed video data storage area information (2). The binary data decoding unit 35 decodes the compressed video data external data. The video decoding unit 37 decodes the compressed video data. The binary data decoding unit 40 decodes the compressed video data storage area information (1).

  The non-video data division unit 36 divides the non-video data into pieces of non-video data according to the data length information sent from the adder 34 and outputs the non-video data to the decoded data integration unit 39. The decoded video division unit 38 divides the video data into each video data according to the data length information sent from the adder 41 and outputs the video data to the decoded data integration unit 39.

  The adder 34 obtains the sum of the video data storage area information (2) sent from the binary data decoding unit 32 and the holding result sent from the holding memory 33, and outputs the sum as data length information. The adder 41 obtains the sum of the video data storage area information (1) sent from the binary data decoding unit 40 and the holding result sent from the holding memory 42, and outputs the sum as data length information.

  The holding memory 33 receives the video data storage area information (2) one by one from the binary data decoding unit 21 and outputs the currently held information as a holding result, and then overwrites the internal holding information with the received value. Do. The holding memory 42 receives the video data storage area information (1) one by one from the binary data decoding unit 40, outputs the information currently held as a holding result, and overwrites the internal holding information with the received value. Do. The initial value of the stored information is 0.

  The decoded data integration unit 39 integrates and decodes the divided non-video data sent from the non-video data division unit 36 and the divided video data sent from the decoded video division unit 38 alternately in a form of combining Output as video content.

  Next, the operation of the video content decoding unit 31 shown in FIG. 5 will be described with reference to FIG. FIG. 6 is a flowchart showing the operation of the video content decoding unit 31 shown in FIG.

  First, the three binary data decoding units 32, 35 and 40 and the video decoding unit 37 decode the four data to obtain video data, non-video data, and video data storage area information (1) and (2) (step S11). ).

  Next, from the image data storage area information (1) D1, D2, D3,..., The adder 34 p1 = D1, p2 = p1 + D2, p3 for each data length p1, p2, p3,. = P 2 + D 3, ..., p N = p N-1 + DN. Similarly, from the image data storage area information (2) d1, d2, d3,..., Each data length n1, n2, n3,... Of non-image data is n1 = d1, n2 = n1 + d2, It is calculated as n3 = n2 + d3,..., nN = nN-1 + dN.

  Next, the non-video data division unit 36 also divides the non-video data into segments according to each data length nN. Further, the decoded video division unit 38 divides the video data into segments according to each data length pN (step S12).

  Finally, the decoded data integration unit 39 alternately combines the segments of the divided video data and the segments of non-video data to restore the original video content (step S13).

  Thus, from video content in which a plurality of types of data are mixed, the same type of data is combined as a series of data, and the combined data is compressed using a compression method suitable for lossless compression of the data. Do. Therefore, the compression rate can be increased as compared with the case of compressing the entire video content using a general-purpose compression method. Further, at the time of decoding, since lossless decoding is performed by the decoding method corresponding to the compression method used for compression, the video content before compression can be completely restored.

Second Embodiment
Next, a video content storage system according to a second embodiment of the present invention will be described. In the present embodiment, a system for storing and returning video content will be described. Storage here means that the video content storage system is requested to store the video content from a remote place via a network such as the Internet, and the video content is deposited and stored in the video content storage system based on this request. Say that. Further, return means returning the video content stored in the video content storage system to the return request source through a network such as the Internet. Also, in the video content storage system according to the second embodiment, it is determined whether the compression processing and the decoding processing are normally performed by the hash value.

  In the storage process of the video, the compressed video content is compressed, and then the restoration process is performed, and whether it is identical to the stored one is compared with the hash value of the both. If the hash value matches, the compression process is performed normally, and the hash value and the complete set of compressed data are stored. On the other hand, if the hash values do not match, the stored video content is stored as it is without compression.

  At the time of return, it is determined whether the stored video content is compressed or not, and if it is not compressed, it is returned as it is. On the other hand, if it has been compressed, restoration processing is performed, and the hash value stored together is compared with that of the restoration result to confirm that they match and to return.

  Here, file property information (such as creation date and update date) of the video content that has been deposited is also stored and restored. At the time of storage, the file property information of the compressed file of the video data is stored by being rewritten with the file property information of the deposited video content.

<Storage processing>
Next, the configuration of the video content storage system according to the second embodiment will be described. FIG. 7 is a block diagram showing a configuration for performing video content storage processing in the video content storage system according to the second embodiment. The video content storage system according to the second embodiment includes a video content compression unit 51, a property detection unit 52, a property rewrite unit 53, a video content decryption unit 54, two hash value calculation units 55 and 57, a hash value comparison control unit 56, The data storage unit 58 is configured.

  The video content compression unit 51 compresses the input video content, and outputs compressed video data, compressed non-video data, and compressed video data storage area information. The video content compression unit 51 can apply the video content compression unit 1 described in the first embodiment.

  The video content decoding unit 54 receives the compressed video data, the compressed non-video data, and the compressed video data storage area information, decodes the video content, and outputs the decoded video content. The video content decoding unit 54 can apply the video content decoding unit 31 described in the first embodiment.

  The hash value calculation units 55 and 57 calculate and output hash values of the input data. The property detection unit 52 reads the file property of the input video content and sends it to the property rewriting unit 53. The property rewriting unit 53 rewrites the file property of the input data with the value sent from the property detection unit 52.

  The data storage unit holds input video content, compressed video data, compressed non-video data, compressed video data storage area information, and a hash value of decoded content. Further, in accordance with the deletion instruction from the hash value comparison control unit 56, any of the held data is deleted.

  The hash value comparison control unit 56 sends the deletion instruction to the data storage unit 58 based on the input comparison result of the two hash values. If the hash values are equal, an instruction to delete the original video content is sent. If the hash values are different, an instruction to delete the compressed video data, the compressed non-video data, the compressed video data storage area information, and the hash value is sent.

  Next, the operation of the video content storage system shown in FIG. 7 will be described. FIG. 8 is a flowchart showing the operation of the video content storage system shown in FIG. First, when the video content to be stored is input, the video content compression unit 51 compresses the video content and generates compressed video data, compressed non-video data, and compressed video data storage area information. (Step S21). This compression process is performed by the same operation (the operation shown in FIG. 3) as the process described in the first embodiment.

  Next, the property detection unit 52 reads the file property of the input video content. Then, the property rewriting unit 53 overwrites the file property of the compressed video data with the read value (step S22).

  Next, the video content decoding unit 54 decodes these three pieces of compressed data to obtain video data, non-video data, and video data storage area information, and restores the original video content from them (step S23). The operation of this restoration process is performed by the same operation (the operation shown in FIG. 6) as the process described in the first embodiment.

  Next, when the video content is input, the hash value calculation unit 55 calculates the hash value of the video content.

  Next, when the video content is restored, the hash calculation unit 57 calculates the hash value (step S24). Then, the hash value comparison control unit 56 compares the hash value obtained by the hash value calculation unit 55 with the hash value obtained by the hash value calculation unit 57 (step S25).

  As a result of this comparison, if they match, the input video content is no longer needed and is deleted (step S26), and the compressed data and the hash value are stored in the data storage unit 58 (step S27). On the other hand, if the hash values do not match, the input video content is stored as it is in the data storage unit 58 (step S28), and the generated compressed data is discarded (step S29).

  By the operation of such processing, the input video content can be compressed and stored in the data storage unit 58.

<Return processing>
Next, processing for returning video content in the video content storage system according to the second embodiment will be described. FIG. 9 is a block diagram showing a configuration for performing return processing in the video content storage system according to the second embodiment.

  The video content storage system according to the second embodiment includes a video content acquisition control unit 61, a data storage unit 62, a video content determination unit 63, a property detection unit 64, a video content decryption unit 65, a property rewrite unit 66, and a hash value calculation unit 67. , A hash value comparison / determination unit 68, a switch A69, and a switch B70. In the configuration, the property detection unit 64, the video content decoding unit 65, the property rewriting unit 66, and the hash value calculation unit 67 are the property detection unit 52, the video content decoding unit 54, the property rewriting unit 53, and the hash value shown in FIG. It has the same function as the calculation units 55 and 57.

  In addition to the same function as the data storage unit 58 shown in FIG. 7, the data storage unit 62 has a function of outputting the stored video content data when receiving an acquisition command of the video content. In addition, in the case of an acquisition command, when the video content data is not stored, an acquisition error is returned. When the video content acquisition control unit 61 receives the video content acquisition command, the video content acquisition control unit 61 instructs the data storage unit 62 to output the corresponding video content data.

  The video content determination unit 63 performs various outputs in accordance with the video content data sent from the data storage unit 62. First, when the output signal from the data storage unit 62 is an acquisition error, an error output is performed. If the video content data is obtained from the data storage unit 62, the data type is determined. As a result of the determination, if it is uncompressed video content data, it is output to the terminal b of the switch B70, and a control signal is sent to the switch B70 to switch the switch to the terminal b side.

  On the other hand, if the determination result is compressed data, it is separated into compressed video data, compressed non-video data, compressed video data storage area information, hash value, and compressed non-video data The compressed video data storage area information is sent to the video content decoding unit 65, and the compressed video data is sent to the property detection unit 64 and the video content decoding unit 65, and the hash value is sent to the hash value comparison and determination unit 68. A control signal is sent to the switch B70, and the switch is switched to the terminal a side.

  The hash value comparison / determination unit 68 compares the hash value sent from the hash value calculation unit 67 with the hash value sent from the video content determination unit 63, and sends a control signal to turn on the switch A69 if they match. When a mismatch occurs, a control signal to turn off the switch A 69 is sent, and an error is output.

  The switch A 69 switches ON and OFF of the switch in accordance with the control signal sent from the hash value comparison / determination unit 68. The switch B70 switches the switch between the terminal a and the terminal b in accordance with the control signal sent from the video content determination unit.

  Next, with reference to FIG. 10, the operation of the video content storage system shown in FIG. 9 will be described. FIG. 10 is a flow chart showing an operation of return processing of compressed data in the video content storage system shown in FIG.

  First, when an inquiry for video content acquisition is received (step S31), the video content acquisition control unit 61 performs data acquisition processing of content to be returned to the data storage unit 61. In response to this, the video content determination unit 63 determines whether or not acquisition has been performed (step S32). Then, when the corresponding data can not be acquired, the video content determination unit 63 outputs an error and ends (step S40).

  On the other hand, when the data can be acquired, the video content determination unit 63 checks the type of the video data (step S33). If the video content is not compressed, the video content determination unit 63 outputs the data as it is and ends the process (step S39).

  On the other hand, if the video content data is compressed, the video content determination unit 63 separates the data into compressed video data, compressed non-video data, compressed video data storage area information, and a hash value. Do. Then, the video content decoding unit 65 decodes the compressed video data, the compressed non-video data, and the compressed video data storage area information to restore the video content (step S34).

  Next, the property rewriting unit 66 rewrites the file property of the decoded video content with the file property of the compressed video data (step S35). Subsequently, the hash value calculation unit 67 calculates the hash value of the decrypted video content.

  Next, the hash value comparison and determination unit 68 compares the hash value stored together with the video data with the hash value obtained by calculation (step S36), and determines whether the hash values match (step S37). If the hash values do not match, an error is output and the process ends (step S40). On the other hand, when the hash values match, the decoded video data is output and the processing is ended (step S39).

  By the operation of such processing, the stored video content can be decrypted and returned.

  As described above, in the video content storage system according to the present embodiment, in the system for compressing and storing the input video content, the storage area of the video data is extracted from the input video content to store the video data. Region information is created, video data is extracted from the input video content, video data is deleted from the input video content, non-video data is created, and video data is encoded and compressed video data Create

  Furthermore, in a system for decoding and storing compressed and stored video, video data storage area information of video content to be returned, non-video data, and compressed video data are input, and compressed video data is decoded to generate restored video data. The restored video content is created from the video data storage area information, the non-video data, and the restored video data.

  In the compression and storage system, the video data storage area information and the non-video data may be compressed using a means for compressing a binary file or a text file. In this case, when the restored video content is created, the compressed video data storage area information and non-video data may be decoded to obtain video data storage area information and non-video data.

  The video data storage area information may be, for example, one representing the arrangement order of the video data and the non-video data in the video content, and their respective data sizes. The arrangement order, the data size of each video data, and the data size of each non-video data may be stored separately, or may be stored together in combination.

  Alternatively, the video data storage area information may be stored in combination with non-video data. For example, in the non-video data, a tag may be put at the position where the video data was originally inserted. In this case, it is conceivable to insert a tag indicating video data to be inserted therein, such as a frame number.

  Further, information on file properties such as creation date and update date of the video content may be stored in either the video data storage area information or the non-video data. Alternatively, the file property may be stored by setting at least one file property of the video data, the non-video data, and the video data storage area information to the same value as the file property of the original video content.

  All or part of the video content storage system in the above-described embodiment may be implemented by a computer. In that case, a program for realizing this function may be recorded in a computer readable recording medium, and the program recorded in the recording medium may be read and executed by a computer system. Here, the “computer system” includes an OS and hardware such as peripheral devices. The term "computer-readable recording medium" refers to a storage medium such as a flexible disk, a magneto-optical disk, a ROM, a portable medium such as a ROM or a CD-ROM, or a hard disk built in a computer system. Furthermore, “computer-readable recording medium” dynamically holds a program for a short time, like a communication line in the case of transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include one that holds a program for a certain period of time, such as volatile memory in a computer system that becomes a server or a client in that case. Further, the program may be for realizing a part of the functions described above, or may be realized in combination with the program already recorded in the computer system. It may be realized using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).

  Although the embodiments of the present invention have been described above with reference to the drawings, it is apparent that the above embodiments are merely examples of the present invention, and the present invention is not limited to the above embodiments. is there. Therefore, additions, omissions, substitutions, and other modifications of the components may be made without departing from the technical spirit and scope of the present invention.

  The present invention can also be applied to applications where it is essential to perform lossless compression to increase the compression ratio when storing video content.

  DESCRIPTION OF SYMBOLS 1 ... Video content compression part, 2 ... Video data extraction part, 3, 6, 8 ... Binary data compression part, 4 ... Video lossless compression part, 5, 7 ... Video data storage area Information calculation unit 9, data length calculation unit 10, holding memory 11, subtractor 31, video content decoding unit 32, 35, 40 binary data decoding unit 33 , 42: holding memory, 34, 41: adder, 36: non-video data division unit, 37: video decoding unit, 38: decoded video division unit, 39: decoded data Integration unit 51, 65: Video content compression unit 52, 64: Property detection unit 53, 66: Property rewriting unit 54: Video content decoding unit 55, 57, 67 · Hash value calculation unit, 56 · · · Hash value comparison system , 58, 62: data storage unit, 61: video content acquisition control unit, 63: video content determination unit, 68: hash value comparison determination unit, 69: switch A, 70 .. Switch B

Claims (7)

A video content storage system for storing video content including video data and non-video data which is not video data, comprising:
A video content input unit for inputting the video content to be stored;
Data obtained by extracting the video data and the non-video data from the input video content and combining the same type of data as a series of data for each of the extracted video data and the non-video data A data compression unit that compresses the video data and the non-video data by performing lossless compression of data according to
A video data storage area information compression unit that performs lossless compression of video data storage area information defining the arrangement order of the video data and the non-video data in the video content and the size of each data;
A video content storage system comprising: a data storage unit for storing the video data and non-video data compressed by the data compression unit and the video data storage area information compressed by the video data storage area information compression unit. A decoding unit that reads out and decodes the video data, the non-video data, and the video data storage area information stored in the data storage unit;
A video content restoration unit that restores the video content by reproducing the arrangement order of the video data and the non-video data of the video content before compression with reference to the decoded video data storage area information The video content storage system according to claim 1, further comprising   The data storage unit restores the video content by the video content restoration unit when storing the video data, the non-video data, and the video data storage area information, and the hash value of the video content is input. The hash value of the video content is calculated, and if both hash values match, the compressed video data, the non-video data and the video data storage area information are stored, and the hash values of both match. 3. The video content storage system according to claim 2, wherein the video content is stored without being compressed if not. A property detection unit that detects file properties of the input video content;
The video content storage system according to any one of claims 1 to 3, further comprising: a property rewriting unit that rewrites a file property of each data after compression according to the file property detected by the property detection unit. A video content storage method performed by a video content storage system for storing video content including video data and non-video data other than video data,
A video content input step of inputting the video content to be stored;
Data obtained by extracting the video data and the non-video data from the input video content and combining the same type of data as a series of data for each of the extracted video data and the non-video data A data compression step of compressing the video data and the non-video data by performing lossless compression of data according to
A video data storage area information compression step for performing lossless compression of video data storage area information defining the arrangement order of the video data and the non-video data in the video content and the size of each data;
A video content storage method comprising a data storage step of storing video data and non-video data compressed in the data compression step and video data storage area information compressed in the video data storage area information compression step in a storage unit. . A decoding step of reading out and decoding the video data, the non-video data and the video data storage area information stored in the data storage step;
A video content restoring step of restoring the video content by reproducing the arrangement order of the video data and the non-video data of the video content before compression with reference to the decoded video data storage area information The video content storage method according to claim 5, further comprising   A video content storage program for causing a computer to function as the video content storage system according to any one of claims 1 to 4.

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