JP6178705B2 - Video distribution system, video distribution apparatus, and video distribution program - Google Patents

Description

  The present invention relates to a video distribution system, a video distribution apparatus, and a video distribution program.

  In recent years, with the development of high-speed network infrastructure, high performance of display devices, imaging cameras, etc., using devices equipped with devices capable of intuitive input by directly touching the screen such as tablet terminals and smartphones, There has been devised a technique for interactively selecting and viewing a desired position and angle of view from a video or image having a size larger than the display area of the device (see, for example, Non-Patent Document 1). In Non-Patent Document 1, a plurality of videos / images having a size larger than the display area of such a user terminal are prepared in advance from a high resolution to a low one, and further some tile-shaped areas (hereinafter referred to as tiles). The tiles are stored in the distribution server and stored in the distribution server, and only the tiles including the user-selected area with the most appropriate resolution for the display device of the user's viewing terminal are efficiently used according to the angle of view size selected by the user. This viewing method is realized by distributing it in an organized manner.

Mobile and Multi-device Interactive Panorama Video Distribution System, Hideaki Kimata, Daisuke Ochi, Akio Kameda, Hajime Noto, Katsuhiko Fukazawa, Akira Kojima, IEEE GCCE 2012 2012.10.2-5 Tokyo, Japan

  However, the technique described in Non-Patent Document 1 has a problem in that when the user changes the part to be viewed interactively or the angle of view, the user has to wait until the distribution of the tile including the newly selected part is received. is there. In order to overcome this problem, until now, low-resolution video / images that have been shown in addition to the tiles including the area selected by the user (videos that have low resolution due to low resolution and are not subject to network load) (Image) is distributed at the same time, and the problem is solved by a method in which the video / image is viewed at a low resolution until a high-resolution tile is distributed. For this reason, since the resolution of the part which a user wants to see falls temporarily, a user's visibility falls, and it cannot be said that the quality of a user experience is high.

  Further, not only the video ahead of the user's viewing timing but also the area around the portion currently being viewed by the user is pre-read and buffered in advance in the user's viewing terminal so that the user can view When the area or the angle of view is changed, the video / image acquired in advance from the buffer area is presented immediately, and the high-resolution tile including the area selected by the user is presented without waiting for the user. Methods based on the idea of buffering are also available. However, in the viewing mode in which the user selects an interactive viewing portion and angle of view, it is unclear when and when the user performs an operation and changes the viewing area and angle of view. Since all video / images up to a certain area and after a predetermined time have to be buffered, there is a problem that it is inefficient and wastes network bandwidth, terminal buffering memory and download resources. .

  The present invention has been made in view of such circumstances, and video distribution capable of efficiently performing video distribution in a system in which a user operates a video interactively and views a portion desired to be viewed at a desired angle of view. It is an object to provide a system, a video distribution device, and a video distribution program.

  According to the present invention, the entire video data is divided into a plurality of small areas, and a divided video composed of at least one small area is selected by a user's selection operation. A video distribution system comprising a video distribution device for distributing data and a user terminal for outputting video data of the distributed divided video, wherein the user terminal selects a desired divided video; A buffer that temporarily stores the video data distributed from the video distribution device; and a video output unit that reads out and outputs the video data stored in the buffer. The video distribution device is selected by the selection unit. A first distribution means for distributing the divided divided video data to the buffer; and the selection means. Storage means for collecting and storing information for specifying the small areas constituting the divided video, and a tendency to select the divided video next from the information for specifying the small areas stored in the storage means. The trend information storage means for specifying and storing the trend information that is information to be displayed, and when the divided video is selected by the selection means, with reference to the trend information stored in the trend information storage means, And second distribution means for distributing the video data of the divided video, which is configured by the small area having a high tendency to be selected, to the buffer.

  In the present invention, the entire video data is divided into a plurality of small areas, and the divided video selected from the whole video data distributed by selecting a divided video constituted by at least one of the small areas by a user selection operation. In order to output the video data, a selection means for selecting the desired divided video, a buffer for temporarily storing the video data distributed from the video distribution device, and reading the video data stored in the buffer A video distribution device that distributes the video data to a user terminal including a video output unit that outputs the divided video data selected by the selection unit to the buffer; 1 distribution means and information for specifying the small area constituting the divided video selected by the selection means is collected. Storage means for storing; trend information storage means for specifying and storing trend information which is information indicating a tendency to select the divided video next from information for specifying the small area stored in the storage means; When the divided video is selected by the selection unit, the video of the divided video configured by the small region having a high tendency to be selected next with reference to the trend information stored in the trend information storage unit And second distribution means for distributing data to the buffer.

  The present invention is characterized in that the trend information storage means changes and stores trend information which is information indicating a tendency to select the divided video next in accordance with the attribute of the user.

  The present invention is a video distribution program for causing a computer to function as the video distribution apparatus.

  According to the present invention, it is possible to efficiently distribute video in a system in which a user interacts with video interactively and views a desired portion of the video at a desired angle of view.

It is a block diagram which shows the structure of the video delivery system by 1st Embodiment of this invention. It is a figure which shows operation | movement of the video delivery system shown in FIG. It is a flowchart which shows the video delivery operation | movement of the video delivery system shown in FIG. In content drawing, it is a figure which shows the relationship between a low resolution tile, a high resolution tile, and the viewing-and-listening part of a user. It is a figure which shows operation | movement of the video delivery system by 2nd Embodiment of this invention. It is a figure which shows operation | movement of the video delivery system by 3rd Embodiment of this invention. It is a figure which shows operation | movement of the video delivery system by 4th Embodiment of this invention.

<First Embodiment>
Hereinafter, a video delivery system according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 10 denotes a distribution server for distributing video. Reference numeral 20 denotes a user viewing terminal for viewing the video distributed from the distribution server 10. The distribution server 10 and the user viewing terminal 20 are connected so that information communication is possible. Reference numeral 11 denotes a content storage unit that stores content that is video to be distributed, and is configured by a storage device. Reference numeral 12 denotes a distribution video determination unit that determines a video to be distributed. Reference numeral 13 denotes a viewing log recording / outputting unit that records and outputs a viewing log related to video viewed on the user viewing terminal 20. Reference numeral 14 denotes a log / viewing trend result storage unit that stores information on viewing logs and viewing trend results, and is configured by a storage device. Reference numeral 15 denotes a viewing tendency calculation unit that calculates a viewing tendency based on a viewing log. Reference numeral 16 denotes a predicted video distribution unit that distributes a predicted video. Reference numeral 17 denotes a low-resolution distribution unit that distributes a low-resolution video. Reference numeral 18 denotes a viewing partial distribution unit that distributes the video of the part being viewed.

  Reference numeral 21 denotes an input unit through which a user who views a video inputs an operation. Reference numeral 22 denotes a display unit that displays the distributed video. Reference numeral 23 denotes a buffer for temporarily storing the video distributed from the distribution server 10. Reference numeral 24 denotes a video request unit that requests a video to be distributed in accordance with the operation content in the input unit 21. Reference numeral 25 denotes a video receiving unit that receives distribution video. Reference numeral 26 denotes a high-resolution video decoding unit that decodes a high-resolution video. Reference numeral 27 denotes a high-resolution video rendering unit that renders the decoded high-resolution video on the display unit 22. Reference numeral 28 denotes a low-resolution video decoding unit that decodes a low-resolution video. Reference numeral 29 denotes a low-resolution video rendering unit that renders the decoded low-resolution video on the display unit 22.

  As the user viewing terminal 20, for example, a terminal such as a tablet or a smartphone provided with a touch panel input can be used. The input unit 21 may be a mouse, a pen tablet, a personal computer having a remote control, an STB (Set Top Box), or the like. The distribution server 10 may have any form as long as it has a function described below, such as a server machine or a PC server.

  The distribution server 10 and the user viewing terminal 20 are integrated, and the user may view the content stored locally using a function described below.

  Next, the operation of the video distribution system shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a diagram showing the operation of the video distribution system shown in FIG. The distribution server 10 includes a content storage unit 11. The content stored in the content storage unit 11 stores video data having a plurality of predetermined resolutions, and is divided into partial images of a predetermined size called tiles for each frame.

  When the user performs a selection operation (operation of the input unit 21) on the user viewing terminal 20 by, for example, a flick / pinch operation on the touch panel of the tablet, the tile including the selected portion (the selected portion is displayed). Tiles with the largest area, called high resolution tiles). The low resolution tile is a tile that includes the entire content, and is always distributed along with the high resolution tile while the user views the content.

  As a result, the user can change the viewing position and angle of view, the system requests a high-resolution tile corresponding to the part, and the video is not interrupted (the video is not lost) while waiting for the distribution. It is possible to view the video. In this embodiment, in addition to this, tiles of predicted video (tiles that will be seen at the next timing) are also sent at the same time by a method described below.

  Next, the video distribution operation of the video distribution system shown in FIG. 1 will be described with reference to FIG. FIG. 3 is a flowchart showing the video distribution operation of the video distribution system shown in FIG. First, the low resolution distribution unit 17 distributes the low resolution tile to the buffer 23 (step S1). Subsequently, the viewing partial distribution unit 18 distributes the high resolution tile to the buffer 23 (step S2).

  Next, the buffer 23 delivers the low resolution tile and the high resolution tile to the video reception unit 25 (step S3). In response to this, the video receiving unit 25 outputs the high resolution tile to the high resolution video decoding unit 26. In response to this, the high resolution video decoding unit 26 decodes the high resolution tile and outputs it to the high resolution video rendering unit 27. Then, the high resolution video rendering unit 27 displays the video of the high resolution tile by rendering the decoded high resolution tile on the display unit 22. In addition, the video receiving unit 25 outputs the low resolution tile to the low resolution video decoding unit 28. In response to this, the low resolution video decoding unit 28 decodes the low resolution tile and outputs it to the low resolution video rendering unit 29. Then, the low resolution video drawing unit 29 displays the video of the low resolution tile by drawing the decoded low resolution tile on the display unit 22. At this time, the low resolution tile and the high resolution tile are superimposed and displayed on the display unit 22 (step S4). This basic operation (steps S1 to S4) is repeated.

  In parallel with this basic operation, when the user performs an operation of selecting a viewing position / viewing angle in the input unit 21 of the user viewing terminal 20, the input unit 21 performs an input operation of the user (for example, a touch panel input operation of the user). Is read (step S5). The input unit 21 passes the input value to the video request unit 24. The video request unit 24 determines whether or not there is a target tile in the buffer 23 (step S6). If there is a target tile in the buffer 23, the above-described basic operation is continued.

  On the other hand, when there is no target tile in the buffer 23, the video request unit 24 requests the target high-resolution tile from the distribution video determination unit 12 (step S7). In response to this, the distribution video determination unit 12 outputs an instruction to distribute the requested high resolution tile to the viewing partial distribution unit 18. The viewing partial distribution unit 18 reads the instructed high resolution tile from the content storage unit 11 and distributes it to the buffer 23 (step S8). Then, similarly to the processing operation described above, steps S3 and S4 are executed, and a high-resolution tile corresponding to the user's operation is displayed on the display unit 22.

  In parallel with this processing operation, the distribution video determination unit 12 views information indicating where the high-resolution tile of the viewing portion requested at the timing of instructing the viewing-partial distribution unit 18 to distribute the high-resolution tile. Notify the log recording / output unit 13. In response to this, the viewing log recording / output unit 13 stores information indicating where the requested high-resolution tile of the viewing portion was in the log / viewing tendency result storage unit 14 (step S9).

  Next, the viewing tendency calculation unit 15 calculates a viewing tendency based on the log information stored in the log / viewing trend result storage unit 14, and the obtained viewing trend information is stored in the log / viewing trend result storage unit. 14 (step S10). The viewing tendency information here is information indicating candidates for a high-resolution tile viewed next to or after the viewed high-resolution tile. Since the number of simultaneous users of the video distribution system is not limited to one, when the same content is viewed a plurality of times, the viewing tendency calculation unit 15 can calculate the viewing frequency of tiles that are viewed at an arbitrary timing of the content. . The viewing tendency calculation unit 15 performs processing for calculating a viewing tendency based on log information stored in the log / viewing trend result storage unit 14 periodically and asynchronously with video distribution and viewing operation. It is stored in the viewing tendency result storage unit 14.

  Next, the current time stored in the log / viewing trend result storage unit 14 for the viewing log recording / output unit at the same timing as the distribution video determination unit 12 outputs the information record to the viewing log recording / output unit 13 In step S11, the user is inquired about the viewing frequency of each tile at the timing when the user is viewing and the future timing of the amount set by the administrator or the user in advance. It is assumed that a future timing and a viewing frequency threshold that should be referred to by the administrator or the user are registered in the distribution server 10 in advance, and a user with a tile having a high viewing frequency, that is, “next timing”, according to the threshold. The distribution video determination unit 12 is replied to the information about which tile the user will view.

  The distribution video determination unit 12 outputs information obtained from the answer to the prediction video distribution unit. In response to this, the predicted video distribution unit 16 reads out the high resolution tile based on this information from the content storage unit 11 and distributes it to the buffer 23 (step S12). There may be a plurality of tiles that the user will view at “next timing” in accordance with a predetermined threshold. With this configuration, when the high-resolution tile requested by the video request unit 24 is stored in the buffer 23 at the next timing, the high-resolution tile is immediately displayed without waiting for the video distribution from the viewing partial distribution unit 18. It can be sent to the video receiver 25.

  Finally, it is determined whether or not it is the end of the content (step S13). If it is the end of the content, the process ends. If it is not the end of the content, the process returns to step S1 to repeat the process.

  Note that the time synchronization between the high resolution tile and the low resolution tile can be realized by adding a header including time information to each file and by putting the time in the file name. An example of the file format of each tile stored in the content storage unit 11 is a still image that is stored for all frames, and an MPEG format that is stored in units of 1 GOP (Group Of Pictures).

  Through the processing operation described above, the low resolution tile delivered to the video receiving unit 25 and the high resolution tile desired by the user are sent to the low resolution video decoding unit 28 and the high resolution video decoding unit 26, respectively, and video decoding processing is performed. Each decoded video is rendered on the user viewing terminal 20 in the format shown in FIG. 4 in the low resolution video rendering unit 29 and the high resolution video rendering unit 27, and the user views the video rendered on the display unit 22. I will watch it. FIG. 4 is a diagram illustrating a relationship among a low resolution tile, a high resolution tile, and a user viewing portion in content drawing.

Second Embodiment
Next, a video distribution system according to a second embodiment of the present invention will be described. The video distribution system according to the second embodiment is different from the video distribution system according to the first embodiment in that there are a plurality of tiles for predictive distribution. FIG. 5 is a diagram showing the operation of the video distribution system in the second embodiment.

  Assuming that the viewing frequency of each tile is calculated in advance from viewing by a plurality of users, the top three viewing frequencies of each tile at time t + 1 next to a high-resolution tile viewed at a certain time t can be distributed to the buffer 23. In this way, it is assumed that the distribution server administrator or the user has set in advance.

  The high resolution tile (A) and the low resolution tile (B) at the current viewing time are distributed, and at the same time, the tiles (C1 to C3) that will be seen at the next timing are distributed. The “tiles that will be seen at the next timing” are the three most frequently viewed within the range in which the user can move between time t and t + 1. The “range” will be set in advance by the administrator or user of the distribution server. For example, the user can move only two tiles in the maximum two-dimensional direction and one tile in the resolution direction within the timing to advance one frame.

  When the user selects an area included in the tile of C2 at the next timing (time t + 1), the distribution request for the high-resolution tile can be immediately delivered from the buffer 23 to the video reception unit 25 without using the distribution server 10. Therefore, the user can immediately view the high-resolution video without feeling the time until the high-resolution tile from the distribution server 10 is distributed.

  Even if the user does not select an area included in the tiles C1 to C3 at the primary timing (time t + 1), the low resolution tile (until the high resolution tile is distributed from the distribution server 10). Since the video can be displayed by the conventional method of displaying B), the user experience does not deteriorate more than before.

  In the present embodiment, the number of tiles to be predicted distributed is three, and they are selected at a future timing (time t + 1). However, the administrator of the distribution server 10 or the user himself / herself considers the buffer size and network speed of the user viewing terminal 20. It is possible to change the threshold value (for example, buffer 5 tiles each until t + 3).

<Third Embodiment>
Next, a video distribution system according to a third embodiment of the present invention will be described. The video distribution system according to the third embodiment is different from the first and second embodiments in that the tile to be predicted and distributed is changed according to the user's attribute. FIG. 6 is a diagram illustrating the operation of the video distribution system in the third embodiment.

  In the video distribution system of the third embodiment, the users who use this distribution service are limited in advance, and when the attributes of the users viewed and what tiles are recorded in the viewing log, The viewing tendency result is changed according to the attribute. That is, from the viewing tendency result, it is understood that, for example, a C1 to 3 tile is often seen at a timing t + 1 next to a certain time t for a man, whereas a C4 to C6 tile is often seen for a woman. If it is, the administrator of the distribution server 10 or the user himself / herself registers the mechanism according to the rule in the viewing log recording / output unit 13, and the tile to be predicted and distributed can be changed according to the gender of the user.

  Here, gender is used as an attribute, but rules may be created based on age, preference of a specific subject, type of past viewing content, and the like. As a result, it is possible to deliver a high-resolution tile of a predicted video tailored to individual preferences.

<Fourth embodiment>
Next, a video distribution system according to a fourth embodiment of the present invention will be described. The video distribution system according to the fourth embodiment is different from the third embodiment in that the third embodiment is developed to grasp and process the entire viewing tendency from the recorded viewing tendency. FIG. 7 is a diagram illustrating the operation of the video distribution system in the fourth embodiment.

  If you know which tiles were seen most by males and females at all times, and if you know in advance how many subjects appear in each tile, which subject for men and which for women It can be easily calculated that the subject is popular (in the example shown in FIG. 7, the subject is male A and the subject B is female), and the preference characteristics of general users can be easily grasped.

  Here, it is assumed that how much the subject is reflected in each tile is known in advance, but the ratio data in which the subject in this tile is reflected is, for example, registered in advance by a human eye or a general tool. For example, automatic registration using (for example, OpenCV face recognition result) can be applied. In this example, there are two subjects (A and B) in the content, but there may be more subjects. Furthermore, although the difference in preference was explained by the attribute of gender this time, it is also possible to calculate from the difference in age, birthplace, country of origin, and the like.

  As described above, it is possible to perform efficient video distribution in a system in which a user interactively manipulates a video / image and views a desired portion of the image at a desired angle of view. To achieve this, when multiple users watched the target content, which tile each user was watching at which timing (frame) (at which timing, which two-dimensional position was viewed at which angle of view) Recording / storing) and analyzing the records of all users to calculate and record the viewing tendency (viewing ratio of each tile at a certain timing) of all users.

  In this method, when a new user views the same content, when the tile selected at an arbitrary timing is distributed from the distribution server, the current user sees at the next timing from the above-mentioned viewing tendency of all users. Wax tiles (two-dimensional surrounding tiles or tiles having different resolutions including a user-selected area) are distributed to the user viewing terminal within a predetermined number of frames. Thereby, tiles that the user will see at the next timing can be distributed in advance. For this reason, when the user selects the tile to be selected next, the probability that the user can view the image with high image quality without first viewing the low-resolution video is increased, and the user experience can be improved. In addition, if the viewing tendency of all users is calculated sequentially, tiles can be pre-distributed even for subjects that suddenly become popular from a certain period of time. It becomes possible. Furthermore, since unnecessary tiles (which are not often viewed by users) are not distributed, consumption of network bandwidth and terminal download resources is minimized in a viewing mode in which a user selects a desired part and angle of view. It becomes possible to suppress to.

  In addition, when the user selects a tile that is not buffered, it is necessary to wait while watching a low-resolution video until an appropriate tile is delivered by the conventional method. The viewing area and angle of view of the “user” are also recorded and stored, and similarly, analysis is performed for the next “new user”. The statistical accuracy is improved, the number of users who have to wait is reduced, and the network bandwidth, the buffering memory of the terminal, and the consumption of download resources are continuously improved.

  In addition, when viewing users have different viewpoints (for example, gender, preference of the subject reflected in the content, age, etc.), the viewing tendency may be different, but if users can be clustered in advance from a specific viewpoint By separately counting the viewing tendency of the user for each viewpoint, if the clustering viewpoint to which the newly viewed user belongs is known, advance distribution suitable for the user can be performed.

  Furthermore, there is an effect that it is possible to grasp the user's preference such as watching more specific subjects from the tile viewing tendency at all times when the user finally viewed.

  The distribution server 10 and the user viewing terminal 20 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a 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).

  As mentioned above, although embodiment of this invention has been described with reference to drawings, the said embodiment is only the illustration of this invention, and it is clear that this invention is not limited to the said embodiment. is there. Therefore, additions, omissions, substitutions, and other modifications of the components may be made without departing from the technical idea and scope of the present invention.

  The present invention can be applied to an application in which it is indispensable to efficiently perform video distribution in a system in which a user interactively manipulates video and views a desired part of the video at a desired angle of view.

  DESCRIPTION OF SYMBOLS 10 ... Distribution server, 11 ... Content storage part, 12 ... Distribution video determination part, 13 ... Viewing log recording / output part, 14 ... Log / viewing tendency result storage part, 15 ... -Viewing tendency calculation unit, 16 ... predicted video delivery unit, 17 ... low resolution delivery unit, 18 ... viewing partial delivery unit, 20 ... user viewing terminal, 21 ... input unit, 22 ..Display unit, 23 ... Buffer, 24 ... Video request unit, 25 ... Video receiving unit, 26 ... High-resolution video decoding unit, 27 ... High-resolution video drawing unit, 28 ...・ Low resolution video decoding unit, 29 ... Low resolution video rendering unit

Claims (3)

The whole video data is divided into a plurality of small areas, and the divided video constituted by at least one of the small areas is selected by the user's selection operation, thereby distributing the video data of the selected divided video among the whole video data. A video distribution system comprising: a video distribution device; and a user terminal that outputs video data of the distributed divided video,
The user terminal is
Selecting means for selecting the desired divided video;
A buffer for temporarily storing the video data distributed from the video distribution device;
Video output means for reading out and outputting the video data stored in the buffer, and
The video distribution device includes:
First distribution means for distributing video data of the divided video selected by the selection means to the buffer;
Storage means for collecting and storing information for specifying the small area constituting the divided video selected by the selection means;
Tendency information storage means for specifying and storing trend information which is information indicating a tendency to select the divided video next from information for specifying the small area stored in the storage means;
When the divided image is selected by the selection means, the tendency information stored in the tendency information storage means is referred to, and the divided image that is configured by the small region having the highest tendency to be selected next is selected. Second distribution means for distributing video data to the buffer ;
The trend information storage means according to the attribute of the user, then the divided image changing trend information is information indicating the tendency to select to store the video distribution system according to claim Rukoto. The whole video data is divided into a plurality of small areas, and the video data of the selected divided video among the whole video data distributed by selecting a divided video constituted by at least one of the small areas by a user selection operation is selected. to output image outputted by reading and selecting means for selecting a desired said divided image, a buffer for temporarily storing the image data delivered from the movies picture distribution device, a video data stored in the buffer A video distribution device that distributes the video data to a user terminal including an output unit,
First distribution means for distributing video data of the divided video selected by the selection means to the buffer;
Storage means for collecting and storing information for specifying the small area constituting the divided video selected by the selection means;
Tendency information storage means for specifying and storing trend information which is information indicating a tendency to select the divided video next from information for specifying the small area stored in the storage means;
When the divided image is selected by the selection means, the tendency information stored in the tendency information storage means is referred to, and the divided image that is configured by the small region having the highest tendency to be selected next is selected. Second distribution means for distributing video data to the buffer ;
The trend information storage means according to the attribute of the user, then the image distribution apparatus characterized that you store the divided image information indicating a tendency to select which alter the tendency information. A video distribution program for causing a computer to function as the video distribution device according to claim 2 .

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