JP2009111708A - Synchronous distribution system, synchronous playback system, and synchronous distribution and playback system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To distribute video data with a light load, without implementing close and complicated processing such as implementing exchange of synchronization information among a plurality of synchronous distribution servers. <P>SOLUTION: When a send-out number distributed from a distribution synchronization terminal 1 is not added to video data yet and the video data are not distributed yet, among a plurality of synchronous distribution servers 13, the send-out number is added to video data and the video data are distributed. When the send-out number distributed from the distribution synchronization terminal 1 is added to video data already and the video data are distributed, an invalid send-out number is added to video data and the video data are distributed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a synchronous distribution system that distributes video data, a synchronous reproduction system that synchronously reproduces video data, and a synchronous distribution reproduction system that includes a synchronous distribution system and a synchronous reproduction system.

For example, Patent Document 1 below discloses a synchronization method between a plurality of transmission terminals and a synchronization method between a plurality of reception terminals in a conventional synchronous distribution reproduction system.
That is, when a plurality of transmitting terminals add sequence numbers to video data and distribute video data with sequence numbers, the same sequence number is added to the video data by exchanging synchronization information with each other. Thus, video data with a sequence number is distributed to the receiving terminal.
On the other hand, the plurality of receiving terminals acquire time information (for example, information indicating the transmission time of the video data) included in the additional information of the video data distributed from the plurality of transmitting terminals, and A time difference is obtained, and synchronization with other receiving terminals is performed based on the time difference.

JP 2002-164915 (pages 4-5, FIG. 4)

Since the conventional synchronous distribution reproduction system is configured as described above, the video data with the same sequence number is not distributed to the receiving terminal by exchanging the synchronous information among a plurality of transmitting terminals. In this way, synchronization between a plurality of transmitting terminals is achieved. However, in order to prevent video data to which the same sequence number is added from a plurality of transmitting terminals from being distributed to the receiving terminal, it is necessary to perform a close and complicated process between the plurality of transmitting terminals. For this reason, the processing load becomes heavier as the number of transmission terminals increases, and it is difficult to increase the number of transmission terminals and increase the number of videos.
In addition, when synchronizing between a plurality of receiving terminals, it is necessary to obtain a time difference between a plurality of time information. For example, even when there is only one video to be reproduced, additional information on all channels (videos) is included. There was a problem that synchronization could not be achieved unless the time information included was confirmed.

The present invention has been made to solve the above-described problems, and can perform video with a light load without performing close and complicated processing such as exchanging synchronization information between a plurality of synchronous distribution servers. An object is to obtain a synchronous distribution system and a synchronous distribution reproduction system capable of distributing data.
Another object of the present invention is to provide a synchronized playback system and a synchronized distribution playback system that can perform synchronized playback of video data without synchronization between a plurality of synchronized playback terminals.

  The synchronized delivery / playback system according to the present invention adds the transmission number to the video data stored in the memory if the latest transmission number received by the transmission number receiving means has not yet been added to the video data and distributed. If the video data with the transmission number is distributed and the latest transmission number received by the transmission number receiving means is already added to the video data and distributed, the video data stored in the memory is transmitted. A plurality of synchronous distribution servers equipped with video distribution means for distributing video data with a transmission number by adding an invalid transmission number different from the number, and a video with a transmission number distributed from the plurality of synchronous distribution servers When data is received and the transmission number added to the video data is a valid transmission number, the transmission number with the first order among the one or more valid transmission numbers is reproduced. A reproduction standard determination terminal that determines a quasi-number and distributes the reproduction reference number is provided, and a reproduction number that is added to video data distributed from a plurality of synchronous distribution servers is distributed from the reproduction standard determination terminal. If the order is the same number as the reference number or the number before the playback reference number, the output order control means for outputting to the decoder in order from the video data to which the order is added is sent to a plurality of synchronization units. It is designed to be installed in the playback terminal.

  According to the present invention, if the latest transmission number received by the transmission number receiving means has not yet been added to the video data and distributed, the transmission number is added to the video data stored in the memory and transmitted. If the numbered video data is distributed and the latest transmission number received by the transmission number receiving means is already added to the video data and distributed, the video data stored in the memory is different from the transmission number. A plurality of synchronous distribution servers equipped with video distribution means for distributing video data with a transmission number by adding a transmission number, and video data with a transmission number distributed from the plurality of synchronous distribution servers If the transmission number added to the video data is a valid transmission number, the most recent transmission number among the one or more valid transmission numbers is determined as the reproduction reference number, A reproduction reference determination terminal that distributes the reproduction reference number, and the transmission number added to the video data distributed from the plurality of synchronous distribution servers is the same as the reproduction reference number distributed from the reproduction reference determination terminal or If the order is ahead of the playback reference number, output order control means for sequentially outputting to the decoder video data to which the order is added is output in a plurality of synchronized playback terminals. As a result, video data can be distributed with a light load without performing close and complex processing such as exchanging synchronization information between multiple synchronous distribution servers, and multiple synchronized playback Video data can be synchronized and reproduced without synchronization between terminals. As a result, the number of synchronized distribution servers and synchronized playback terminals can be increased without increasing the processing load, and the number of videos can be easily increased by increasing the number of synchronized distribution servers and synchronized playback terminals. There is an effect that can.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a synchronized delivery reproduction system according to Embodiment 1 of the present invention. In the figure, a delivery synchronized terminal 1 is a terminal installed at a delivery base, Processing for distributing the transmission number to a plurality of synchronous distribution servers 13 in the distribution base is performed.
The counter 2 performs a process of incrementing the transmission number as a count value and outputting the transmission number at regular intervals.
The transmission number distribution unit 3 includes a communication interface such as a modem, and performs a process of distributing the transmission number output from the counter 2 to the plurality of synchronous distribution servers 13 via the transmission path 20.
The counter 2 and the transmission number distribution unit 3 constitute transmission number distribution means.

The camera 11 is a photographing device that captures video, and outputs video data (stream) indicating the video to the encoder 12.
The encoder 12 encodes the video data output from the camera 11 and outputs the encoded video data to the synchronous distribution server 13.

The synchronous distribution server 13 is a device installed at the distribution base, stores the video data output from the encoder 12 in the video data storage unit 17, and the video data storage unit 17 stores a predetermined amount of video data. When the transmission size is reached, processing for distributing the video data to the reproduction reference determination terminal 30 and the synchronous reproduction terminal 50 in the reception base is performed via the transmission path 20.
The transmission number receiving unit 14 includes a communication interface such as a modem, and performs a process of receiving the transmission number distributed from the distribution synchronization terminal 1. The transmission number receiving unit 14 constitutes a transmission number receiving unit.

The transmission number storage unit 15 stores the latest transmission number received by the transmission number receiving unit 14 (overwriting the new transmission number over the old transmission number), and the stored transmission number is already added to the video data. This is a memory for storing a transmission flag indicating whether or not the message has been distributed.
The video acquisition unit 16 includes an input / output interface with respect to the encoder 12, and inputs the video data output from the encoder 12 and performs processing for storing the video data in the video data storage unit 17.
The video data storage unit 17 is a memory for storing video data.

The video distribution unit 18 includes a communication interface such as a modem. When the amount of video data stored in the video data storage unit 17 reaches a predetermined transmission size, the transmission flag stored in the transmission number storage unit 15 is “ If "undelivered" is indicated, the latest transmission number stored in the transmission number storage unit 15 is added to the video data stored in the video data storage unit 17, and the video data with the transmission number is received at the receiving site. To the reproduction reference determination terminal 30 and the synchronous reproduction terminal 50. On the other hand, if the transmission flag stored in the transmission number storage unit 15 indicates “distributed”, an invalid transmission number (for example, different from the latest transmission number in the video data stored in the video data storage unit 17). , “0”) is added, and the process of distributing the video data with the transmission number to the reproduction reference determination terminal 30 and the synchronous reproduction terminal 50 in the reception base is performed.
The transmission number storage unit 15, the video acquisition unit 16, the video data storage unit 17, and the video distribution unit 18 constitute a video distribution unit.

The reproduction standard determination terminal 30 is a terminal installed at the reception base, receives video data with a transmission number distributed from a plurality of synchronous distribution servers 13 at the distribution base, and extracts a transmission number from the video data. If a plurality of transmission numbers are valid transmission numbers, among the one or more valid transmission numbers, the transmission number with the earliest order is determined as the reproduction reference number, and the reproduction reference number is used as the synchronization instruction terminal 40. Process to deliver to.
The transmission number extraction unit 31 includes a communication interface such as a modem, and is associated with and corresponds to one of the plurality of synchronous distribution servers 13 installed at the distribution base. When the video data with the transmission number distributed from the synchronous distribution server 13 is received, the transmission number is extracted from the video data. If the transmission number is a valid transmission number, the reproduction reference number determination unit 32 can refer to it. A process of recording the transmission number in the storage area is performed. The transmission number extraction unit 31 constitutes transmission number extraction means.

The reproduction reference number determination unit 32 is composed of, for example, a semiconductor integrated circuit board on which an MPU is mounted, and among the effective transmission numbers recorded in the referenceable storage area, the transmission number with the earliest order. A process for determining the playback reference number is performed.
The reproduction reference number distribution unit 33 includes a communication interface such as a modem, and performs a process of distributing the reproduction reference number determined by the reproduction reference number distribution 32 to the synchronization instruction terminal 40.
The reproduction reference number determination unit 32 and the reproduction reference number distribution unit 33 constitute reproduction reference number distribution means.

The synchronization instruction terminal 40 is a terminal installed at the receiving base, receives the reproduction reference number distributed from the plurality of reproduction reference determination terminals 30, and among the plurality of reproduction reference numbers, the reproduction reference having the first order The number is determined as the final reproduction reference number, and processing for transferring the reproduction reference number to a plurality of synchronized reproduction terminals 50 is performed.
The reproduction reference number receiving unit 41 includes a communication interface such as a modem, and performs a process of receiving reproduction reference numbers distributed from a plurality of reproduction reference determination terminals 30.
The reproduction reference number transfer unit 42 includes a communication interface such as a modem, for example. Among the plurality of reproduction reference numbers received by the reproduction reference number reception unit 41, the reproduction reference number with the earliest order is finally reproduced. A process of determining the reference number and transferring the reproduction reference number to a plurality of synchronized playback terminals 50 is performed.
The reproduction reference number receiving unit 41 and the reproduction reference number transfer unit 42 constitute reproduction reference number transfer means.

The synchronized playback terminal 50 is a terminal installed at a receiving base, and receives video data distributed from a plurality of synchronous distribution servers 13, decodes the video data, and performs a process of rendering a video.
The data receiving unit 51 includes a communication interface such as a modem, and receives video data with transmission numbers distributed from a plurality of synchronous distribution servers 13 and also receives reproduction reference numbers transferred from the synchronization instruction terminal 40. Perform the process. The data receiving unit 51 constitutes a data receiving unit.

  The output order control unit 52 is composed of, for example, a semiconductor integrated circuit board on which an MPU is mounted, and the transmission number added to the video data received by the data receiving unit 51 is received by the data receiving unit 51. If the number is the same as the reproduction reference number or the order is earlier than the reproduction reference number, the video data to which the transmission number is added in order is output to the decoder 53 in order. The output order control unit 52 constitutes output order control means.

The decoder 53 is composed of, for example, a semiconductor integrated circuit board on which an MPU is mounted. The decoder 53 decodes the video data output from the output order control unit 52 and outputs the decoded video data to the drawing unit 54. Perform the process.
The drawing unit 54 is composed of, for example, a semiconductor integrated circuit board on which a GPU is mounted. The drawing unit 54 performs a process of drawing a video on the display unit 55 in accordance with the decoded video data output from the decoder 53.
The display unit 55 is, for example, a display device such as a PC monitor, a DLP monitor, or an LED monitor.

In FIG. 1, the counter 2 and the transmission number distribution unit 2 which are constituent elements of the synchronous distribution terminal 1 are illustrated as being configured by dedicated hardware, but the synchronous distribution terminal 1 is configured by a computer. In this case, the program describing the processing contents of the counter 2 and the transmission number distribution unit 2 may be stored in the memory of a computer, and the CPU stored in the memory may be executed by the CPU of the computer.
In addition, in FIG. 1, the transmission number receiving unit 14, the video acquisition unit 16, and the video distribution unit 18, which are components of the synchronous distribution server 13, are illustrated as being configured by dedicated hardware. When the distribution server 13 is configured by a computer, a program describing the processing contents of the transmission number receiving unit 14, the video acquisition unit 16, and the video distribution unit 18 is stored in the memory of the computer, and the CPU of the computer stores the memory. You may make it run the program stored in this.

FIG. 1 illustrates an example in which the transmission number extraction unit 31, the reproduction reference number determination unit 32, and the reproduction reference number distribution unit 33, which are constituent elements of the reproduction standard determination terminal 30, are each configured by dedicated hardware. However, when the reproduction reference determination terminal 30 is configured by a computer, a program describing the processing contents of the transmission number extraction unit 31, the reproduction reference number determination unit 32, and the reproduction reference number distribution unit 33 is stored in the memory of the computer. The program may be stored, and the CPU of the computer may execute the program stored in the memory.
Similarly, in FIG. 1, the reproduction reference number receiving unit 41 and the reproduction reference number transfer unit 42 which are constituent elements of the synchronization instruction terminal 40 are illustrated as being configured by dedicated hardware. When the terminal 40 is configured by a computer, a program describing the processing contents of the reproduction reference number receiving unit 41 and the reproduction reference number transfer unit 42 is stored in the memory of the computer, and the CPU of the computer stores the program in the memory. The program may be executed.

  Further, FIG. 1 exemplifies a case where the data receiving unit 51, the output order control unit 52, the decoder 53, and the drawing unit 54, which are constituent elements of the synchronized playback terminal 50, are each configured by dedicated hardware. However, when the synchronized playback terminal 50 is configured by a computer, a program describing the processing contents of the data receiving unit 51, the output order control unit 52, the decoder 53, and the drawing unit 54 is stored in the memory of the computer. The CPU stored in the memory may be executed by the CPU of the computer.

Next, the operation will be described.
Only one distribution synchronization terminal 1 is installed in the distribution base. When the distribution synchronization terminal 1 is activated, the transmission number as a count value is incremented every certain time, and the transmission number is synchronized with a plurality of synchronizations in the distribution base. A process of distributing to the distribution server 13 is performed.
However, the transmission number may be a numerical value that changes every time it is distributed, and is a numerical value that is not related to unique information (for example, absolute time, frame number, etc.) related to video data.
FIG. 2 is a flowchart showing the processing contents of the distribution synchronization terminal 1.
Hereinafter, the processing content of the delivery synchronous terminal 1 is demonstrated concretely.

The counter 2 of the delivery synchronization terminal 1 is initialized with the delivery interval time T of the delivery number S, the upper limit value S_MAX of the delivery number S, the invalid delivery number, etc. (step ST1), and the delivery number S is reset ( Step ST2).
Here, for convenience of explanation, for example, it is assumed that the upper limit value S_MAX of the transmission number S is initially set to “1000”, the invalid transmission number is initially set to “0”, and the transmission number S is reset to “1”. Shall.

When the counter 2 of the distribution synchronization terminal 1 is activated (step ST3), after sleeping for the distribution interval time T (step ST4), the current transmission number S is output to the transmission number distribution unit 3.
At this stage, since the transmission number S is reset to “1” in step ST2, the transmission number S of “1” is output to the transmission number distribution unit 3.
Upon receiving the transmission number S from the counter 2, the transmission number distribution unit 3 of the distribution synchronization terminal 1 distributes the transmission number S to all the synchronous distribution servers 13 in the distribution base via the transmission path 20 (step ST5). ).
The delivery method of the transmission number S is not particularly limited, but may be multicast using an IP network or unicast, for example.
The transmission line 20 may be a LAN or a telephone network. However, a communication line in which a communication delay occurs so that the broadcast performance is deteriorated may affect the synchronization performance and should be avoided.

When the transmission number distribution unit 3 distributes the transmission number S, the counter 2 checks whether or not the transmission number S has reached the upper limit value S_MAX (step ST6).
In the first embodiment, since the upper limit value S_MAX is initially set to “1000”, it is confirmed whether or not the transmission number S is “1000”.
If the transmission number S has not yet reached the upper limit value S_MAX, the counter 2 increments the transmission number S by “1” (step ST7).
Here, the value for incrementing the transmission number S is “1”, but the value is not limited to “1”. For example, the value for incrementing the transmission number S may be “2” or “3”. .
If the transmission number S has already reached the upper limit value S_MAX, the counter 2 resets the transmission number S to “1” (step ST8).

Thereafter, the distribution synchronization terminal 1 repeatedly performs the processes of steps ST4 to ST8.
The transmission number S is set and distributed between “1” and “1000”, and the invalid transmission number S “0” is not distributed.
Incidentally, when the transmission number S is reset to “1” in steps ST2 and ST8, for example, if the value for incrementing the transmission number S is set to “2”, an even value can be defined as an invalid transmission number. it can.

The camera 11 shoots a video and outputs video data (stream) indicating the video to the encoder 12.
When the encoder 12 receives the video data from the camera 11, the encoder 12 encodes the video data and outputs the encoded video data to the synchronous distribution server 13.

A plurality of synchronous distribution servers 13 are installed in the distribution base, accumulate the video data output from the encoder 12 in the video data storage unit 17, and the video data storage unit 17 stores a predetermined amount of video data. When the transmission size is reached, processing for distributing the video data to the reproduction reference determination terminal 30 and the synchronous reproduction terminal 50 in the reception base is performed via the transmission path 20.
FIG. 3 is a flowchart showing the processing contents of the transmission number receiving unit 14 in the synchronous distribution server 13, and FIG. 4 is a flowchart showing the processing contents of the video distribution unit 18 in the synchronous distribution server 13.
Hereinafter, the processing content of the synchronous delivery server 13 is demonstrated concretely.

The video acquisition units 16 in the plurality of synchronous distribution servers 13 receive the video data output from the encoder 12 and accumulate the video data in the video data storage unit 17.
The transmission number receiving unit 14 of the synchronous distribution server 13 stands by until the transmission number S is distributed from the distribution synchronization terminal 1, and receives the transmission number S when the transmission number S is distributed from the distribution synchronization terminal 1 ( Step ST11).

When the transmission number receiving unit 14 in the plurality of synchronous distribution servers 13 receives the transmission number S from the distribution synchronous terminal 1, the transmission number receiving unit 14 records the transmission number S in the transmission number storage unit 15 (step ST12).
However, when the transmission number S is recorded in the transmission number storage unit 15, if the old transmission number S previously distributed from the distribution synchronization terminal 1 is recorded in the transmission number storage unit 15, this time from the distribution synchronization terminal 1. The latest delivery number S delivered is overwritten on the old delivery number S.
In addition, the transmission number receiving unit 14 transmits a transmission flag S_flg related to the latest transmission number S distributed from the distribution synchronization terminal 1 this time (transmission indicating whether or not the transmission number S has already been distributed to the video data. The transmission flag is recorded in the transmission number storage unit 15) (step ST13).
That is, the transmission number receiving unit 14 indicates that the transmission flag S_flg recorded in the transmission number storage unit 15 indicates “undelivered” of the transmission number S (the transmission number S is not yet added to the video data and distributed). To a state indicating that).
Thereafter, the transmission number receiving unit 14 repeatedly performs the processes of steps ST11 to ST13.

When the video distribution unit 18 in the plurality of synchronous distribution servers 13 is activated, the transmission flag S_flg recorded in the transmission number storage unit 15 indicates the state of “distributed” of the transmission number S (the transmission number S is already a video). (A state indicating that the data has been added to the data) (step ST21).
As described above, in the initial state, the transmission flag S_flg is set to a state indicating “distributed” of the transmission number S. However, before the determination process of step ST23 described later is performed, the transmission number receiving unit 14 performs distribution. When the latest transmission number S distributed from the synchronous terminal 1 is received, the transmission flag S_flg is reset to a state indicating “undistributed” of the transmission number S.

In the video distribution unit 18, the amount of video data stored in the video data storage unit 17 (the amount of video data output from the encoder 12 and stored in the video data storage unit 17) reaches a predetermined transmission size. (Step ST22), and when the video data storage amount reaches a predetermined transmission size, it is determined whether or not the transmission flag S_flg recorded in the transmission number storage unit 15 is in a reset state (step ST23). .
That is, the video distribution unit 18 checks whether the transmission flag S_flg indicates “undelivered” of the transmission number S or “distributed” of the transmission number S.

When the transmission flag S_flg indicates “undistributed” of the transmission number S, the video distribution unit 18 stores the latest transmission stored in the transmission number storage unit 15 in the video data stored in the video data storage unit 17. The number S is added, and the transmission flag S_flg is set to a state indicating “distributed” of the transmission number S (step ST24).
On the other hand, when the transmission flag S_flg indicates “distributed” of the transmission number S, a numerical value indicating an invalid transmission number in the video data stored in the video data storage unit 17 (“0 in this embodiment 1). ") Is added (step ST25).
When the transmission number is added to the video data in step ST24 or ST25, the video distribution unit 18 distributes the video data with the transmission number to the reproduction reference determination terminal 30 and the synchronous reproduction terminal 50 in the reception base (step ST26).

As described above, according to the first embodiment, if a plurality of synchronous distribution servers 13 have not yet been distributed with the transmission number distributed from the distribution synchronous terminal 1 added to the video data, the transmission number is set. It is configured to be distributed by adding to the video data, and if the transmission number distributed from the distribution synchronization terminal 1 is already added to the video data and distributed, the invalid transmission number is added to the video data and distributed. Therefore, video data can be distributed with a light load without performing close and complicated processing such as exchanging synchronization information among the plurality of synchronous distribution servers 13.
That is, at the distribution base, the plurality of synchronous distribution servers 13 add the transmission number to the video data based only on the reception timing of the transmission number S distributed from the distribution synchronous terminal 1. Between the synchronous distribution servers 13, it is possible to share the distribution of video data to the receiving base and the communication line for synchronization without any synchronization. For this reason, synchronous delivery can be realized with a simple configuration.
In addition, since no adjustment is required between the plurality of synchronous distribution servers 13, there is no need to start the synchronous distribution servers 13 and no activation procedure, and the number of synchronous distribution servers 13 is increased by the number that can be received simultaneously. Can do.
Furthermore, since each synchronous distribution server 13 is operating independently, even if the number of synchronous distribution servers 13 is increased, it can operate without any influence (loading even with one or 1000 units). Is constant).

One or more reproduction standard determination terminals 30 are installed at the reception base, receive video data with a transmission number distributed from a plurality of synchronous distribution servers 13 at the distribution base, and extract the transmission number from the video data. Then, among the plurality of transmission numbers, the transmission number with the first order is determined as the reproduction reference number, and the reproduction reference number is distributed to the synchronization instruction terminal 40.
FIG. 5 is a flowchart showing the processing contents of the transmission number extraction unit 31 in the reproduction reference determination terminal 30, and FIG. 6 is a flowchart showing the processing contents of the reproduction reference number determination unit 32 in the reproduction reference determination terminal 30.
FIG. 7 is a flowchart showing the processing contents of the reproduction reference number distribution unit 33 in the reproduction reference determination terminal 30.
Hereinafter, the processing content of the reproduction | regeneration reference | standard determination terminal 30 is demonstrated concretely.

The transmission number extraction unit 31 in the plurality of reproduction reference determination terminals 30 is associated with one of the plurality of synchronous distribution servers 13 installed in the distribution base, and corresponds to the corresponding synchronous distribution server 13. Preparation for waiting is performed so that the video data with the transmission number distributed from the distribution server 13 can be received (step ST31).
For example, when receiving video data distributed by multicast, generally, a multicast address and a port number are required, so the multicast address and the port number are initialized. In addition, terminal-specific information such as the reception buffer size is also initialized.

When the standby preparation is completed, the transmission number extraction unit 31 waits until the video data with the transmission number is distributed from the corresponding synchronous distribution server 13, and the video with the transmission number from the corresponding synchronous distribution server 13. When the data is distributed, the video data with the transmission number is received (step ST32).
When receiving the video data with the transmission number, the transmission number extracting unit 31 extracts the transmission number S from the video data (step ST33).

Further, when the transmission number S is extracted from the video data, the transmission number extraction unit 31 determines whether or not the transmission number S is a valid transmission number (step ST34).
In the first embodiment, since the transmission number “0” is defined as an invalid transmission number, if the transmission number S is not “0”, it is determined that the transmission number is valid. .
If the transmission number S is an invalid transmission number, the transmission number extraction unit 31 discards the transmission number S, returns to the process of step ST32, and if the transmission number S is a valid transmission number, the transmission number. S is recorded in a storage area that can be referred to by the reproduction reference number determination unit 32 (step ST35).
Thereafter, the transmission number extraction unit 31 repeats the processes of steps ST32 to ST35.

The reproduction reference number determination unit 32 in the plurality of reproduction reference determination terminals 30 includes a distribution interval time T of the transmission number S, a storage area in which the effective transmission number S is recorded by the transmission number extraction unit 31, and the reproduction reference determination terminal 30. The number of installed transmission number extraction units 31 (the number of channels handled by the reproduction criterion determination terminal 30) and the like are initialized (step ST41).
When activated, the reproduction reference number determination unit 32 sleeps for the delivery interval time T (step ST42), reads the effective transmission number S from the storage area, compares the plurality of transmission numbers S, and The transmission number with the first order (the transmission number with the smallest numerical value) is determined as the reproduction reference number (step ST43).
When the reproduction reference number determination unit 32 determines the reproduction reference number, the reproduction reference number is output to the reproduction reference number distribution unit 33.
Thereafter, the reproduction reference number determination unit 32 repeatedly performs the processes of steps ST42 to ST43.

When the reproduction reference number distribution unit 33 in the plurality of reproduction reference determination terminals 30 receives the reproduction reference number from the reproduction reference number determination unit 32 (step ST51), the reproduction reference number is transmitted to the synchronization instruction terminal 40 via the transmission line 20. (Step ST52).
Thereafter, the reproduction reference number distribution unit 33 repeatedly performs the processes of steps ST51 to ST52.

Only one synchronization instruction terminal 40 is installed in the reception base, receives the reproduction reference numbers distributed from the plurality of reproduction reference determination terminals 30, and has the earliest order among the plurality of reproduction reference numbers. The reproduction reference number is determined as the final reproduction reference number, and the reproduction reference number is transferred to a plurality of synchronized reproduction terminals 50.
FIG. 8 is a flowchart showing the processing contents of the reproduction reference number receiving unit 41 in the synchronization instruction terminal 40, and FIG. 9 is a flowchart showing the processing contents of the reproduction reference number transfer unit 42 in the synchronization instruction terminal 40.
Hereinafter, the processing contents of the synchronization instruction terminal 40 will be specifically described.

The reproduction reference number receiving unit 41 of the synchronization instruction terminal 40 secures storage areas for recording reproduction reference numbers as many as the number of reproduction reference determination terminals 30 installed in the reception base as an initialization process (step ST61). .
When the reproduction reference number is distributed from a plurality of reproduction reference determination terminals 30, the reproduction reference number receiving unit 41 receives the reproduction reference number and stores the reproduction reference number in a storage area corresponding to each reproduction reference determination terminal 30. Record (step ST62).
Thereafter, the reproduction reference number receiving unit 41 repeatedly performs the process of step ST62.

The reproduction reference number transfer unit 42 of the synchronization instruction terminal 40 is initialized with the delivery interval time T of the transmission number S (step ST71).
When activated, the reproduction reference number transfer unit 42 sleeps for the delivery interval time T (step ST72), and then reads out a plurality of reproduction reference numbers from the storage areas corresponding to the plurality of reproduction reference determination terminals 30 (step ST72). ST72).
The reproduction reference number transfer unit 42 compares a plurality of reproduction reference numbers, determines the reproduction reference number with the earliest order (the transmission number with the smallest numerical value) as the final reproduction reference number, and passes through the transmission path 20. Then, the reproduction reference number is transferred to all the synchronous reproduction terminals 50 in the reception base (step ST73).
Thereafter, the reproduction reference number transfer unit 42 repeatedly performs the processes of steps ST72 to ST74.

A plurality of synchronized playback terminals 50 are installed at the receiving base, and receive video data distributed from a plurality of synchronized distribution servers 13, decode the video data, and perform video rendering.
FIG. 10 is a flowchart showing the processing contents of the data receiving unit 51 and the output order control unit 52 in the synchronized playback terminal 50.
Hereinafter, the processing content of the synchronized playback terminal 50 will be described in detail.

The data receiving unit 51 in the plurality of synchronized playback terminals 50 includes video data with transmission numbers distributed from the plurality of synchronized distribution servers 13 installed at the distribution bases, and a playback reference number transferred from the synchronization instruction terminal 40. Is set so that it can be received (step ST81).
For example, when receiving video data distributed by multicast, generally, a multicast address and a port number are required, so the multicast address and the port number are initialized.
Information such as a reception timeout value is also initialized.

When the initial setting is completed, the data receiving unit 51 waits until video data with transmission numbers or playback reference numbers are distributed from the synchronization instruction terminal 40 from the plurality of synchronous distribution servers 13. When the reproduction reference number is distributed from the video data with the transmission number or the synchronization instruction terminal 40, the video data with the transmission number or the reproduction reference number is received (step ST82).
However, if the video data with the transmission number or the reproduction reference number is not distributed even after the reception timeout value has elapsed, the reception standby state is cancelled.

When receiving the video data with the transmission number or the reproduction reference number, the data receiving unit 51 checks whether or not the data transmission source is the synchronization instruction terminal 40 (step ST83). That is, the data receiving unit 51 confirms whether or not the received data is a reproduction reference number.
When the data transmission source is the synchronization instruction terminal 40, the data receiving unit 51 is the reproduction reference number if the reproduction reference number that is the received data is a valid reproduction reference number (if the reproduction reference number is not “0”). The number is overwritten in a predetermined storage area (step ST84).

When the data transmission source is the synchronous distribution server 13, the data receiving unit 51 stores the video data with the transmission number, which is the received data, in a predetermined storage area (step ST85).
However, if the storage area is full, the oldest video data is deleted and new video data is stored instead.
If the video data with the transmission number has not been received even after the reception time-out value has elapsed, the video data with the transmission number has not been received, and the video data is stored in a predetermined storage area. No processing is performed.

The output order control unit 52 in the plurality of synchronized playback terminals 50 extracts the transmission numbers from all the video data stored in the predetermined storage area, and the reproduction reference overwritten in the transmission numbers and the predetermined storage area. By comparing the number, the video data with the added transmission number being the same as the reproduction reference number and the added transmission number are ordered from the reproduction reference number out of all the video data. And the video data having the previous number are selected (step ST86).
For example, if the reproduction reference number is “15”, video data to which the same transmission number as “15” or a transmission number smaller than “15” is added is selected. Note that video data to which a transmission number greater than “15” is added is discarded.

When the output order control unit 52 selects the video data to which the same transmission number as the reproduction reference number or the transmission number whose order is earlier than the reproduction reference number is selected, the order is selected from the selected one or more video data. The video data to which the previous transmission number (transmission number with a smaller numerical value) is added is sequentially output to the decoder 53 (step ST87).
Thereafter, the data receiving unit 51 and the output order control unit 52 repeatedly perform the processes of steps ST82 to ST87.

When receiving the video data from the output order control unit 52, the decoders 53 in the plurality of synchronized playback terminals 50 decode the video data and output the decoded video data to the drawing unit 54.
When receiving the decoded video data from the decoder 53, the drawing units 54 in the plurality of synchronized playback terminals 50 draw the video on the display unit 55 according to the decoded video data.

As described above, since the plurality of synchronized playback terminals 50 receive only the determined video data with the transmission number and the playback reference number, even if the number of video data distributed from the distribution base increases, Reproduction processing can be performed with a constant load.
Further, the reproduction standard determination terminal 30 and the synchronization instruction terminal 40 are divided, and for the reproduction standard determination terminal 30, the number of videos to be examined (the number of synchronous distribution servers 13 to be handled) is determined according to the capability. Can do. For this reason, it does not become an overload, and it can respond, even if the number of the images delivered from a delivery base increases by increasing the number of the reproduction | regeneration reference | standard determination terminals 30.
Also, the reproduction reference number determined by each of the plurality of reproduction reference determination terminals 30 is notified to the synchronization instruction terminal 40, and the synchronization instruction terminal 40 determines the final reproduction reference number for the entire system from the plurality of reproduction reference numbers. Therefore, it is possible to synchronize many videos with low load.

In the first embodiment, a case where a plurality of reproduction reference determination terminals 30 and synchronization instruction terminals 40 are installed in the reception base is shown. However, the number of synchronous distribution servers 13 installed in the distribution base is the same. In the case where the number is small, as shown in FIG. 11, only one reproduction standard determination terminal 30 may be installed in the reception base, and the synchronization instruction terminal 40 may not be installed.
In this case, the reproduction reference determination terminal 30 directly distributes the determined reproduction reference number to the plurality of synchronized reproduction terminals 50.
In this case, since the number of terminals at the receiving base can be reduced, the cost can be reduced.

In addition, when the video data with a plurality of transmission numbers is distributed, if the communication quality is known in advance, the reproduction reference number may be determined from the video data with one transmission number that is predicted to have the longest delay. Is possible.
In that case, the playback reference number transfer unit 42 of the synchronization instruction terminal 40 further analyzes the playback reference numbers distributed from the plurality of playback reference determination terminals 30 and sets the playback reference number with the largest delay from the plurality of playback reference numbers to 1. Alternatively, the reproduction reference number may be selected and transferred to the synchronous reproduction terminal 40.

Embodiment 2. FIG.
In the first embodiment, the adjustment of the frame rate of the video data is not particularly mentioned, but the output order is based on the remaining amount of video data that has not yet been output from the output order control unit 52 to the decoder 53. The control unit 52 (frame rate adjusting means) may transmit a frame rate adjustment command for adjusting the frame rate of the video data to the encoder 12 or the drawing unit 54.
Since the processing contents other than the synchronized playback terminal 50 are the same as those in the first embodiment, only the processed contents of the synchronized playback terminal 50 will be described.
FIG. 12 is a flowchart showing the processing contents of the data receiving unit 51 and the output order control unit 52 in the synchronized playback terminal 50.

The data receiving unit 51 in the plurality of synchronized playback terminals 50 includes video data with transmission numbers distributed from the plurality of synchronized distribution servers 13 installed at the distribution bases, and a playback reference number transferred from the synchronization instruction terminal 40. Is set to be able to be received (step ST91).
For example, when receiving video data distributed by multicast, generally, a multicast address and a port number are required, so the multicast address and the port number are initialized.
In addition, information such as a reception timeout value, a buffer upper limit value, and an allowable value α from the reference buffer number is also initialized.

When the initial setting is completed, the data receiving unit 51 waits until video data with transmission numbers or playback reference numbers are distributed from the synchronization instruction terminal 40 from the plurality of synchronous distribution servers 13. When the reproduction reference number is distributed from the video data with the transmission number or the synchronization instruction terminal 40, the video data with the transmission number or the reproduction reference number is received (step ST92).
However, if the video data with the transmission number or the reproduction reference number is not distributed even after the reception timeout value has elapsed, the reception standby state is cancelled.

When receiving the video data with the transmission number or the reproduction reference number, the data receiving unit 51 checks whether or not the data transmission source is the synchronization instruction terminal 40 (step ST93). That is, the data receiving unit 51 confirms whether or not the received data is a reproduction reference number.
When the data transmission source is the synchronization instruction terminal 40, the data receiving unit 51 is the reproduction reference number if the reproduction reference number that is the received data is a valid reproduction reference number (if the reproduction reference number is not “0”). The number is overwritten in a predetermined storage area (step ST94).

When the data transmission source is the synchronous distribution server 13, the data receiving unit 51 stores the video data with the transmission number as received data in a predetermined storage area (step ST95).
However, if the storage area is full, the oldest video data is deleted and new video data is stored instead.
If the video data with the transmission number has not been received even after the reception time-out value has elapsed, the video data with the transmission number has not been received, and the video data is stored in a predetermined storage area. No processing is performed.

The output order control unit 52 in the plurality of synchronized playback terminals 50 extracts the transmission numbers from all the video data stored in the predetermined storage area, and reproduces the transmission numbers and the predetermined storage areas overwritten. By comparing the reference number with the reference number, the video data to which the transmission number having the order earlier than the reproduction reference number is added is searched.
The output order control unit 52 includes video data to which a transmission number that is later in order (a transmission number that has the largest numerical value) is added among video data that has a transmission number that precedes the reproduction reference number. (Newest video data) is stored as video data P (step ST96).

If the current process is the first data transfer to the decoder 53 (step ST97), the output order control unit 52 outputs only the video data P to the decoder 53 (step ST97). At this time, depending on the size of the buffer mounted on the decoder 53, a plurality of video data before and after the video data P may be output to the decoder 53. However, all the synchronized playback terminals 50 need to perform the same operation.
When outputting the video data P to the decoder 53, the output order control unit 52 deletes the video data P stored in a predetermined storage area and video data older than the video data P.
Further, after the above processing, the output order control unit 52 confirms the number of video data with transmission numbers remaining in a predetermined storage area, and stores the number as the buffer reference number N.
This buffer reference number N is the first synchronization result, and maintaining this buffer reference number N means that reproduction synchronization is maintained (unless the image coding rate is changed, the amount of received video data is unit time Will be the same).
If the current process is the first data transfer to the decoder 53, when the process of step ST98 is completed, the process returns to step ST92.

When the current process is not the first data transfer to the decoder 53 (step ST97), the output order control unit 52 adds the transmission data added with the transmission number remaining in the predetermined storage area. The video data whose number is the same as the reproduction reference number and the video data whose transmission number added is the number ahead of the reproduction reference number are selected.
When the output order control unit 52 selects the same transmission number as the reproduction reference number or video data to which a transmission number earlier in the order than the reproduction reference number is added, the transmission number in the order earlier (a transmission number having a smaller numerical value) Are sequentially output to the decoder 53 (step ST99).
Note that the video data output to the decoder 53 is deleted from a predetermined storage area.

When the output order control unit 52 outputs the video data with the transmission number to the decoder 53, the output order control unit 52 checks the number M of the video data with the transmission number currently remaining in the predetermined storage area, and the video data It is determined whether or not the number M is within an allowable range (step ST100).
The output order control unit 52 determines that the number M of video data is within the allowable range if the following expression (1) is satisfied.
N−α ≦ M ≦ N + α (1)

The allowable value α is a value closely related to the synchronization accuracy during reproduction, and is a design value determined by how much synchronization is realized.
For example, in a moving image in which 30 frames are to be reproduced per second, when an error of ± 1 frame is allowed, α is data corresponding to 33 milliseconds.
In addition, when the data corresponding to 33 milliseconds is 100 kilobytes and the video data with the transmission number is 5 kilobytes per one, α is 20. In other words, if ± 20 buffers are exceeded, it means that “100 kilobyte tolerance = exceeds 1 frame error”.

When the number M of video data is within the allowable range, the output order control unit 52 returns to the process of step ST92 without adjusting the frame rate because the current frame rate is appropriate.
On the other hand, when the number M of the video data is outside the allowable range, a frame rate adjustment command for increasing the frame rate of the video data by one level (or decreasing by one level) is output to the encoder 12 or the drawing unit 54 (step ST101).
For example, when the buffer becomes larger than the allowable value α during synchronous playback of a moving image of 30 frames per second, the buffer consumption per second increases by increasing the playback speed to 31 frames per second. On the contrary, when the buffer becomes smaller than the allowable value α, the consumption of the buffer is reduced by reducing the reproduction speed to 29 frames per second.

  As is apparent from the above, according to the second embodiment, each synchronized playback terminal 50 performs processing so as to keep the buffer amount constant from the first synchronization, so that the synchronized playback terminal that exists at the reception base of the system. All 50 synchronizations will be met. Therefore, each synchronized playback terminal 50 can synchronize as a system only by precisely managing its own buffer amount without being conscious of other synchronized playback terminals 50, and can be synchronized more simply and inexpensively. A reproduction system can be realized.

Embodiment 3 FIG.
In the first embodiment, the camera 11 and the encoder 12 are mounted as video sources in the preceding stage of the synchronous distribution server 13, but instead of the camera 11 and the encoder 12, for example, commercially available An HDV output camera may be mounted. In this case, the HDV output camera corresponds to the one in which the encoder 12 is included.

The camera 11 in FIG. 1 may be anything as long as it is a device that outputs video data before encoding.
In the first embodiment, the video data output from the encoder 12 is shown to be given to the synchronous distribution server 13. However, the video data output from the encoder 12 is stored in an external storage device. Alternatively, it may be given to the synchronous distribution server 13 from the external storage device.

Furthermore, not only the video shot by the camera 11 but also a high-quality video generated in advance is divided into a plurality of video data files for each distribution unit, and each video data file is divided into a plurality of synchronous distribution servers. 13 may be distributed.
As a result, without using a special video distribution device or a complicated device, a huge video can be distributed in synchronism and can be distributed at a reception base to be distributed.

Embodiment 4 FIG.
In the first to third embodiments, the case where a plurality of synchronized playback terminals 50 reproduce a plurality of different videos for the purpose of synchronizing a plurality of different video data (streams) has been described. It is also possible for a plurality of synchronized playback terminals 50 to synchronously playback the same video by receiving the same video.
According to the fourth embodiment, the display of the same image, which was not a problem with analog, is solved in the case of receiving and displaying the same source video in the distribution of the digital image due to the frame shift depending on the state of each system. can do.
For example, in a television store of a mass retailer, all the televisions in the analog era displayed the same image, whereas in the digital broadcasting era, there is a slight shift for each digital television.
According to the fourth embodiment, it is possible to eliminate a deviation in the case where the same source video is reproduced and displayed on a plurality of synchronized reproduction terminals 50.

It is a block diagram which shows the synchronous delivery reproduction | regeneration system by Embodiment 1 of this invention. It is a flowchart which shows the processing content of the delivery synchronous terminal 1. 5 is a flowchart showing processing contents of a transmission number receiving unit 14 in the synchronous distribution server 13. 4 is a flowchart showing processing contents of a video distribution unit 18 in the synchronous distribution server 13. 4 is a flowchart showing processing contents of a transmission number extraction unit 31 in the reproduction criterion determination terminal 30. 4 is a flowchart showing processing contents of a reproduction reference number determination unit 32 in the reproduction reference determination terminal 30. 4 is a flowchart showing processing contents of a reproduction reference number distribution unit 33 in the reproduction reference determination terminal 30. 4 is a flowchart showing processing contents of a reproduction reference number receiving unit 41 in the synchronization instruction terminal 40. 4 is a flowchart showing processing contents of a reproduction reference number transfer unit 42 in the synchronization instruction terminal 40. 4 is a flowchart showing processing contents of a data receiving unit 51 and an output order control unit 52 in the synchronized playback terminal 50. It is a block diagram which shows the synchronous delivery reproduction | regeneration system by Embodiment 1 of this invention. It is a flowchart which shows the processing content of the data reception part 51 and the output order control part 52 in the synchronous reproduction | regeneration terminal 50 of the synchronous delivery reproduction | regeneration system by Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Distribution synchronous terminal, 2 Counter (transmission number distribution means), 3 Transmission number distribution part (transmission number distribution means), 11 Camera, 12 Encoder, 13 Synchronous distribution server, 14 Transmission number receiving part (transmission number reception means) , 15 Transmission number storage unit (video distribution unit), 16 video acquisition unit (video distribution unit), 17 video data storage unit (video distribution unit), 18 video distribution unit (video distribution unit), 20 transmission path, 30 playback standard Determination terminal, 31 transmission number extraction unit (transmission number extraction means), 32 reproduction reference number determination unit (reproduction reference number distribution means), 33 reproduction reference number distribution unit (reproduction reference number distribution means), 40 synchronization instruction terminal, 41 reproduction Reference number receiving unit (reproduction reference number transfer unit), 42 Reproduction reference number transfer unit (reproduction reference number transfer unit), 50 Synchronous reproduction terminal, 51 Data reception unit (data reception unit) Means), 52 an output sequence control unit (output order control unit, the frame rate adjusting means), 53 decoder, 54 drawing unit, 55 display unit.

Claims (7)

  In a synchronous distribution system composed of a distribution synchronization terminal and a plurality of synchronous distribution servers, a transmission number distribution means for distributing the transmission number is mounted in the distribution synchronization terminal while periodically increasing the transmission number, and the distribution When the transmission number receiving means for receiving the transmission number distributed from the transmission number distribution means of the synchronous terminal, the encoded video data is stored in the memory, and the storage amount of the video data in the memory reaches a predetermined transmission size. If the latest transmission number received by the transmission number receiving means has not yet been added to the video data and distributed, the transmission number is added to the video data stored in the memory, If the video data is distributed and the latest transmission number received by the transmission number receiving means is already added to the video data and distributed, Video distribution means for adding an invalid transmission number different from the transmission number to the video data stored in the memory and distributing the video data with the transmission number is installed in the plurality of synchronous distribution servers. Synchronous distribution system characterized by   In a synchronized playback system composed of a playback reference determining terminal and a plurality of synchronized playback terminals, a plurality of video data with transmission numbers distributed from a plurality of synchronous distribution servers are received, and a plurality of transmission numbers are extracted from the video data If the transmission number extracted by the transmission number extraction means and the plurality of transmission number extraction means is a valid transmission number, among the one or more valid transmission numbers, the first transmission number in the order is the reproduction reference number. The reproduction reference number distribution means for distributing the reproduction reference number is installed in the reproduction reference determination terminal, and receives the video data with the transmission number distributed from the plurality of synchronous distribution servers, Data receiving means for receiving the reproduction reference number distributed from the reproduction reference number distributing means of the reproduction reference determining terminal, and video data received by the data receiving means If the added transmission number is the same number as the reproduction reference number received by the data receiving means or if the order is ahead of the reproduction reference number, the video data to which the transmission number of the order is added An output order control means for sequentially outputting to the decoder in the plurality of synchronized playback terminals.   In a synchronized playback system composed of a plurality of playback reference determining terminals, a synchronization instruction terminal, and a plurality of synchronized playback terminals, receives video data with a transmission number distributed from a plurality of synchronous distribution servers and transmits from the video data If a plurality of transmission number extraction means for extracting numbers and the transmission numbers extracted by the plurality of transmission number extraction means are valid transmission numbers, the first in the order of one or more valid transmission numbers A reproduction reference number distribution means for determining a transmission number as a reproduction reference number and distributing the reproduction reference number is mounted in the plurality of reproduction reference determination terminals, and reproduction reference number distribution means for the plurality of reproduction reference determination terminals. Is provided with a reproduction reference number transfer means for receiving the reproduction reference number distributed from the above and transferring the reproduction reference number having the first order among the plurality of reproduction reference numbers in the synchronization instruction terminal. Data receiving means for receiving video data with a transmission number distributed from the plurality of synchronous distribution servers and receiving a reproduction reference number transferred from a reproduction reference number transfer means of the synchronization instruction terminal; and the data receiving means If the transmission number added to the video data received by is the same as the reproduction reference number received by the data receiving means or if the order is earlier than the reproduction reference number, the order is the previous transmission number. A synchronized playback system, wherein the plurality of synchronized playback terminals are equipped with output order control means for sequentially outputting video data to which the video data is added to the decoder.   A frame rate adjustment command for adjusting the frame rate of video data based on the remaining amount of video data that has not yet been output from the output order control means to the decoder. 4. A synchronized playback system according to claim 2, further comprising a frame rate adjusting means for transmitting to the receiver.   Based on the remaining amount of video data not yet output from the output order control means to the decoder, a frame rate adjustment command for adjusting the frame rate of the video data is sent to the video according to the video data decoded by the decoder. 4. The synchronized playback system according to claim 2, further comprising a frame rate adjusting means for transmitting to a drawing apparatus for drawing.   In a synchronous distribution reproduction system composed of a synchronous distribution system composed of a distribution synchronous terminal and a plurality of synchronous distribution servers, and a synchronous reproduction system composed of a reproduction reference determination terminal and a plurality of synchronous reproduction terminals, the transmission number is periodically set. A delivery number receiving means for delivering the delivery number while being increased in the delivery synchronization terminal, and a delivery number receiving means for receiving the delivery number delivered from the delivery number delivery means of the delivery synchronization terminal; Is stored in the memory, and when the storage amount of the video data in the memory reaches a predetermined transmission size, the latest transmission number received by the transmission number receiving means is still added to the video data and distributed. If not, the transmission number is added to the video data stored in the memory, and the video data with the transmission number is added. If the latest transmission number received by the transmission number receiving means is already added to the video data and distributed, an invalid transmission number different from the transmission number is assigned to the video data stored in the memory. In addition, video distribution means for distributing video data with a transmission number is mounted in the plurality of synchronous distribution servers, and the video data with transmission numbers distributed from the video distribution means of the plurality of synchronous distribution servers A plurality of transmission number extraction means for receiving and extracting a transmission number from the video data; and if the transmission numbers extracted by the plurality of transmission number extraction means are valid transmission numbers, one or more effective transmission numbers Among them, the reproduction reference number distribution means for determining the transmission number with the first order as the reproduction reference number and distributing the reproduction reference number is mounted in the reproduction reference determination terminal, and the plurality of the same A data receiving means for receiving the video data with the transmission number distributed from the video distribution means of the distribution server and receiving the reproduction reference number distributed from the reproduction reference number distribution means of the reproduction reference determination terminal; If the transmission number added to the video data received by the means is the same number as the playback reference number received by the data receiving means or if the order is ahead of the playback reference number, the order is sent earlier. A synchronous distribution reproduction system, characterized in that output sequence control means for sequentially outputting video data to which numbers are added to a decoder is mounted in the plurality of synchronous reproduction terminals.   Synchronous distribution reproduction system comprising a synchronous distribution system composed of a distribution synchronous terminal and a plurality of synchronous distribution servers, and a synchronous reproduction system composed of a plurality of reproduction reference determining terminals, a synchronization instruction terminal and a plurality of synchronous reproduction terminals In the transmission, a transmission number distribution means for distributing the transmission number is mounted in the distribution synchronization terminal while periodically increasing the transmission number, and the transmission number distributed from the transmission number distribution means of the distribution synchronization terminal is received. The number receiving means and the encoded video data are stored in the memory, and when the storage amount of the video data in the memory reaches a predetermined transmission size, the latest transmission number received by the transmission number receiving means is still a video. If the data is not distributed in addition to the data, the transmission number is added to the video data stored in the memory and transmitted. If the latest transmission number received by the transmission number receiving means is already added and distributed to the video data, the transmission number and the video data stored in the memory are A video distribution means for distributing video data with a transmission number with a different invalid transmission number is installed in the plurality of synchronous distribution servers, and the distribution distributed from the video distribution means of the plurality of synchronous distribution servers A plurality of transmission number extraction means for receiving numbered video data and extracting a transmission number from the video data; and one or more if the transmission numbers extracted by the plurality of transmission number extraction means are valid transmission numbers Among the effective transmission numbers, the reproduction reference number distribution means for determining the reproduction reference number that is the first in the order as the reproduction reference number and distributing the reproduction reference number, The playback standard number received from the playback reference number distribution means of the plurality of playback standard determination terminals is received, and the playback order number that is the earliest among the plurality of playback reference numbers is transferred. The reference number transfer means is mounted in the synchronization instruction terminal, receives the video data with the transmission number distributed from the video distribution means of the plurality of synchronous distribution servers, and from the reproduction reference number transfer means of the synchronization instruction terminal. The data receiving means for receiving the transferred reproduction reference number, and the transmission number added to the video data received by the data receiving means is the same as the reproduction reference number received by the data receiving means or the reproduction Output sequence control means for outputting to the decoder in order from video data to which the transmission number is added if the order is earlier than the reference number; A synchronous distribution reproduction system, which is mounted in a plurality of synchronous reproduction terminals.

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