JP2004179913A - System and method for reading in av data from av server - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable editing terminals more than synchronous input/output ports of na AV server to read in AV data from the AV server simultaneously in parallel, to enable an editing terminal to read in AC data from the AV server through follow-up reproduction, and to shorten a wait time that an editing terminal has when reading in AV data of frames at intervals. <P>SOLUTION: Provided is a recording device 2 which is capable of faster access than a recording means in the AV server and connected to a plurality of editing terminals 1, each of which includes a 1st processing means of requesting transfer of AV data from a synchronous input/output port of the AV server 4 to the recording device 2 and a 2nd processing means of reading in AV data recorded in the recording device 2 at a request made by the 1st processing means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a system and method for a plurality of editing terminals to read AV data from an AV server.
[0002]
[Prior art]
Today, broadcasting stations generally store AV data (video data and audio data) as materials in a large-capacity AV server.
[0003]
An AV server generally has a RAID (Redundant Arrays of Inexpensive Disks) configured by using a plurality of hard disk drives, and has a plurality of synchronous input / output ports typified by an SDI (Serial Digital Interface). . In addition to the SDI input / output port, there is an AV server having a network interface for performing communication via a network according to the TCP / IP protocol.
[0004]
AV data sent to the AV server from outside (such as a VTR in a broadcasting station or a video camera at a news gathering site connected to the broadcasting station via a wide area network) is input to one of the SDI input / output ports, and is sent to the SDI input / output port. A compression process is performed at the input / output port. Then, the data is sent to the RAID from the SDI input / output port and recorded on the RAID.
[0005]
AV data read from the RAID and sent to one of the SDI input / output ports is subjected to decompression processing or the like at the SDI input / output port. The data is output from the SDI input / output port and sent from the AV server to the outside (on-air server, backup server, etc.).
[0006]
By the way, in a broadcasting station, instead of sending the material stored in an AV server as it is on the air, the material is edited by an editing terminal (non-linear editing machine), and the editing result (so-called “complete packet”) is used when broadcasting the program. Often sent.
[0007]
Conventionally, as a method for an editing terminal to read AV data stored in an AV server from the AV server, one of the following methods (a) and (b) has been adopted.
[0008]
(A) The SDI input / output port of the AV server is connected to the editing terminal in a one-to-one correspondence, and the editing terminal reads the AV data output from the corresponding SDI input / output port (for example, see Patent Document 1). ).
[0009]
(B) In an AV server having a network interface of the TCP / IP protocol, the editing terminal reads AV data transmitted from the network interface by the file transfer protocol (FTP).
[0010]
[Patent Document 1]
JP-A-8-221951 (paragraph numbers 0003 to 0006, FIG. 3)
[0011]
[Problems to be solved by the invention]
However, in the above method (a), since the input / output ports and the editing terminals are in one-to-one correspondence, a larger number of editing terminals than the number of SDI input / output ports are simultaneously and simultaneously transmitted from the AV server. There is an inconvenience that data cannot be read (that is, the number of DI input / output ports of the AV server is the upper limit of the number of editing terminals that can simultaneously edit materials stored in the AV server). .
[0012]
In broadcast stations, there are many cases where various and large amounts of materials stored in an AV server are simultaneously edited by a plurality of editing terminals. In such a case, it is very inconvenient that the number of editing terminals that can edit at the same time is limited in this way.
[0013]
Also, in the method (b), the AV data in the file cannot be reproduced until after the file is completed. There is an inconvenience that the data cannot be read by the editing terminal when the data is played back from the AV server (by chase playback).
[0014]
For example, in news programs, it is often the case that it is required to edit the material stored in the AV server within a limited time until the scheduled on-air time. It is very inconvenient that chase reproduction cannot be performed in such a case.
[0015]
In any of the above methods (a) and (b), in the RAID of the AV server, the AV data of the jumping frame is edited because the AV data is distributed and recorded on a plurality of hard disk drives. However, there is an inconvenience that the waiting time (latency) between reading of certain AV data and reading of the next AV data becomes long when reading is performed.
[0016]
Since the editing operation is often performed while watching the video by jumping in frame units, the editing terminal often reads the AV data of the jumping frame. It is very inconvenient to increase the waiting time in such a case.
[0017]
In view of the above, the present invention allows a larger number of editing terminals than the number of synchronous input / output ports of an AV server to read AV data from an AV server simultaneously and in parallel, and to output AV data from an AV server. An object of the present invention is to make it possible to perform chase reproduction and read the data by the editing terminal, and to shorten the waiting time when the editing terminal reads the AV data of the jumping frame.
[0018]
[Means for Solving the Problems]
In order to solve this problem, the present applicant has developed a system in which a plurality of editing terminals read AV data from an AV server having AV data recording means and a synchronous I / O port. It is possible to access at a higher speed than the means and comprises a recording device connected to the plurality of editing terminals, and each editing terminal requests a transfer of AV data from the input / output port of the AV server to the recording device. A system for reading AV data from an AV server having first processing means and second processing means for reading AV data recorded in the recording device based on a request from the first processing means is proposed.
[0019]
In this reading system, each of a plurality of editing terminals connected to a recording device that can be accessed at a higher speed than the recording means in the AV server is first processed by the first processing means from the synchronous I / O port of the AV server. After requesting the transfer of the AV data to the recording device, the AV data recorded in the recording device is read by the second processing means, so that the AV data is read from the AV server to the editing terminal.
[0020]
Therefore, when the AV server transfers AV data from one synchronous I / O port to the recording device, a plurality of editing terminals can read the AV data from the AV server simultaneously and in parallel via the recording device. Can be. As a result, a larger number of editing terminals than the number of synchronous input / output ports of the AV server can simultaneously read AV data from the AV server.
[0021]
Also, since the AV data is output from the synchronous input / output port (not transmitted from the network interface by the file transfer protocol), the AV data can be chased and reproduced from the AV server and read by the editing terminal.
[0022]
Further, since this recording device can access at higher speed than the recording means in the AV server, the waiting time when the editing terminal (second processing means) reads the AV data of the jumping frame from this recording device is longer than the AV server. Is shorter than the waiting time when reading the AV data of the jumping frame.
[0023]
In this reading system, for example, as the recording device, a recording device having a plurality of fiber channel ports is used, which is connected to the recording device and connected to the synchronous input / output port of the AV server. Further comprising a gateway terminal for outputting AV data from the connected synchronous input / output port of the AV server based on a request from the first processing means, converting the AV data into a format, and recording the AV data in the recording device. Preferably, the first processing means of each editing terminal sends a request to this gateway terminal.
[0024]
As a result, transmission and reception of AV data between the gateway terminal, the recording device, and the editing terminal are performed by the fiber channel. By making a network connection utilizing the characteristics of the fiber channel, one synchronous I / O port of the AV server can be provided. A larger number of editing terminals can read AV data from the AV server simultaneously and in parallel.
[0025]
Further, in the case where the transmission and reception of AV data between the gateway terminal, the recording device, and the editing terminal are performed by the fiber channel, as an example, the gateway terminal stores the AV data in the file in which the recording device records the AV data. Information indicating a portion where data has been recorded is recorded, and the second processing means of each editing terminal reads AV data from a portion of the file where AV data is recorded based on this information in the file. It is preferable that
[0026]
Thereby, even when the editing terminal reads the AV data from the recording device while the recording device is recording the AV data in the file, the editing terminal reads the portion of the file in which the AV data is not yet recorded. It is possible to prevent a situation in which the time is exceeded.
[0027]
Next, in a method in which a plurality of editing terminals read AV data from an AV server having AV data recording means and a synchronous input / output port, each of the editing terminals may be configured to read the synchronous data of the AV server. A first step of requesting a transfer of AV data from the output port to a recording device which can be accessed at a higher speed than the recording means of the AV server and is connected to the plurality of editing terminals; A second step of reading AV data recorded in the recording device based on the request in the first step, and a method of reading AV data from an AV server.
[0028]
According to this reading method, as in the above-described reading system according to the present invention, a larger number of editing terminals than the number of synchronous I / O ports of the AV server are simultaneously and simultaneously transmitted from the AV server to the AV data. Can be read, and the AV data can be chased and played back from the AV server and read by the editing terminal, and the waiting time when the editing terminal reads the AV data of the jumping frame can be shortened.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example in which the present invention is applied to a news production system of a broadcasting station will be specifically described with reference to the drawings.
[0030]
FIG. 1 shows an example of the overall configuration of a news production system to which the present invention is applied. This system includes two editing terminals 1, a solid state disk (SSD) 2, a gateway terminal 3, and an AV server 4. The editing terminal 1, the SSD 2 and the gateway terminal 3 constitute a reading system according to the present invention.
[0031]
The SSD 2 is a storage system equipped with a solid state memory (SDRAM) and having four fiber channel ports, and can be accessed at a higher speed than a hard disk drive.
[0032]
In the AV server 4, although not shown, an SDI input / output port, a RAID, and a controller for controlling the entire AV server are connected via a bus.
[0033]
Each editing terminal 1 and the SSD 2 are connected by a fiber channel. The gateway terminal 3 is connected to a controller and an SDI input / output port in the AV server 4 and is connected to the SSD 2 via a fiber channel.
[0034]
Each editing terminal 1 and the gateway terminal 3 are connected by Ethernet (registered trademark) (registered trademark) 5 ("Ethernet (registered trademark) (registered trademark)" is a registered trademark). The editing terminal 1 and the gateway terminal 3 are each configured by a computer such as a workstation.
[0035]
FIG. 2 shows software installed in the editing terminal 1 and the gateway terminal 3. In addition to the editor 11 which is application software for editing, the editing terminal 1 transfers the AV data from the SDI input / output port of the AV server 4 to the SSD 2 via the Ethernet (registered trademark). And the AV data recorded on the SSD 2 is read into the editing terminal 1 (for this purpose, the SSD 2 is controlled by exchanging with the SSD-FC 21 which is the system software of the SSD 2). ) FSD 13 which is processing software is installed.
[0036]
The gateway terminal 3 transmits the AV data from the AV server 4 based on the request from the IFC 12 in the editing terminal 1 and converts the format of the AV data into a format for transmission on the fiber channel. An FDL 31 which is software for processing for recording AV data which has been format-converted by the SSD 2 (for that purpose, controlling the SSD 2 by exchanging with the SSD-FC 21 which is SSD 2 system software) is installed.
[0037]
FIG. 3 shows a processing sequence by the editor 11, the IFC 12, the FSD 13, the gateway 32, and the FDL 31 in FIG. 2 when each editing terminal 1 reads a material (AV data) from the AV server 4.
[0038]
When an operation for transferring a certain file stored in the AV server 4 to the SSD 2 is performed on the operation screen by the editor 11, the editor 11 in the editing terminal 1 transmits the file to the IFC 12 in the same editing terminal 1 and to the SSD 2. Send a transfer request.
[0039]
Upon receiving this transfer request, the IFC 12 sends a request to load the file to the SSD 2 to the gateway 32 in the gateway terminal 3 via the Ethernet (registered trademark) 5 (FIG. 1).
[0040]
Based on the load request, the gateway 32 causes the controller in the AV server 4 to specify the file name and output the AV data in the file from the SDI input / output port connected to the gateway terminal 3. Request. Further, a file for recording the AV data is created in the SSD 2 via the FDL 31 in the gateway terminal 3. Then, the IFC 12 in the editing terminal 1 that has sent the loading request is notified via the Ethernet (registered trademark) 5 that the loading has started and the file name created in the SSD 2.
[0041]
Subsequently, when the AV data is sent from the SDI input / output port of the AV server 4 to the gateway terminal 3, the gateway 32 converts the format of the AV data for transmission on the fiber channel, and then transmits the format to the SSD 2 via the FDL 31. Send it and write it to the created file in SSD2. In addition, end-of-data (EOD), which is information indicating the end of a portion of the file where AV data is recorded, is recorded in an area for recording metadata of the file via the FDL 31.
[0042]
Subsequently, when all the AV data from the AV server 4 is written to the file in the SSD 2, the gateway 32 records a write end bit in the metadata recording area of the file via the FDL 31. Then, the file is closed by the SSD 2 via the FDL 31, and the file is also closed by the controller in the AV server.
[0043]
When the IFC 12 in the editing terminal 1 is notified of the loading start from the gateway 32 in the gateway terminal 3 and the file name created in the SSD 2, the IFC 12 requests the editor 11 in the editing terminal 1 to transfer the data to the SSD 2. The SSD 2 is notified of the fact (“OK”) and the file name created.
[0044]
After the editor 11 in the editing terminal 1 receives this notification from the IFC 12, when the operation of reading the AV data transferred to the SSD 2 into the editing terminal 1 is performed on the operation screen by the editor 11, the editor 11 performs the same editing. The file name notified from the IFC 12 is specified to the SSD 2 via the FSD 13 in the terminal 1.
[0045]
In response to the specification of the file name, the SSD 2 returns the handle value of the file (a value unique to the file in the system) to the editor 11 via the FSD 13 in the editing terminal 1.
[0046]
When the handle value is returned, the editor 11 reads the metadata in the file from the SSD 2 via the FSD 13 at any time, and reads the AV of the portion of the file before the end indicated by EOD in the metadata. Data is read from the SSD 2 to the editing terminal 1. If the metadata includes a write end bit, it is possible to know that all the AV data has been written to the file.
[0047]
FIG. 4 shows a processing sequence by the editor 11, the IFC 12, the FSD 13, the gateway 32, and the FDL 31 of FIG. 2 when writing an editing result (edited AV data) in the editing terminal to the AV server 4.
[0048]
After the AV data read by the editing terminal 1 in the sequence of FIG. 3 is edited on the operation screen by the editor 11, when the operation of writing the edited AV data to the AV server 4 is performed on this operation screen, The editor 11 in the editing terminal 1 causes the file for recording the edited AV data to be created in the SSD 2 via the FSD 13 in the same editing terminal 1.
[0049]
The SSD 2 returns the handle value of the created file (a value unique to the file in the system) to the editor 11 via the FSD 13 in the editing terminal 1.
[0050]
When the handle value is returned, the editor 11 causes the SSD 2 via the FSD 13 to start writing the edited AV data to the created file. Then, a transfer request of the AV data of the file in the SSD 2 to the AV server 4 is sent to the IFC 12 in the same editing terminal 1.
[0051]
When the IFC 12 receives the transfer request, the IFC 12 sends a request to the AV server 4 to save the file created by the SSD 2 to the gateway 32 in the gateway terminal 3 via the Ethernet (registered trademark) 5 (FIG. 1). send.
[0052]
The gateway 32 in the gateway terminal 3 causes the controller in the AV server 4 to create a file for recording the edited AV data based on the storage request. Further, the file created for recording the edited AV data is specified to the SSD 2 via the FDL 31 in the gateway terminal 3. Then, the IFC 12 in the editing terminal 1 that has sent the save request is notified via the Ethernet (registered trademark) 5 that the save has started and the file name created in the AV server 4.
[0053]
The IFC 12 in the editing terminal 1 notifies the editor 11 in the editing terminal 1 to the AV server that the saving has been started from the gateway 32 in the gateway terminal 3 and the file name created in the AV server 4. Is notified ('OK') and the name of the created file to the AV server 4.
[0054]
The editor 11 in the editing terminal 1 causes the SSD 2 to write the edited AV data to the file via the FSD 13 while the AV data of the file is recorded in the metadata recording area of the file. The end of data (EOD), which is information indicating the end of the part, is recorded. Then, when all the edited AV data is written, a write end bit indicating that all the AV data has been written is recorded in the metadata recording area of the file. (The period from the start of the writing of the edited AV data to the recording of the write end bit is a period during which the data is actually written to the SSD2 file.)
[0055]
The gateway 32 in the gateway terminal 3 notifies the IFC 12 in the editing terminal 1 of the start of storage and the name of the created file to the AV server 4, and then transmits the meta data of the file created in the SSD 2 via the FDL 31. While reading data from the SSD 2 as needed, the AV data of the portion of the file before the end indicated by EOD in the metadata is read from the SSD 2. Then, after converting the read AV data into a format for transmission by SDI, the AV data is input to the SDI input / output port of the AV server 4 and written into the file created by the AV server 4.
[0056]
When the gateway 32 reads the write end bit as the metadata of the file created on the SSD 2, the gateway 32 records the transferred bit in the metadata area of the file. Then, it causes the controller of the AV server 4 to close the created file. The file is also closed by the SSD 2 via the FDL 31.
[0057]
After recording the write end bit in the metadata recording area of the file created in the SSD 2 and reading the transferred bit from the metadata area of the file, the editor 11 in the editing terminal 1 Let SSD2 close the file. When the SSD 2 closes the file, the SSD 2 notifies the editor 11 via the FSD 13 that the file has been closed ('OK').
[0058]
Next, how the editing terminal 1 edits the materials stored in the AV server 4 in the news production system will be described.
[0059]
On the operation screen of the editor 11, the operator of each editing terminal 1 reads files stored in the AV server 4 (for example, transmitted from a video camera at a certain news gathering site to a broadcasting station over a wide area network and stored in the AV server). When the operation of transferring the transferred AV data to the SSD 2 is performed, the AV data in the file is shared by the AV server 4 by the editor 11 and IFC 12 in the editing terminal 1 and the gateway 32 and FDL 31 in the gateway terminal 3. The data is output from the SDI input / output port and transferred / recorded to the SSD 2 (FIG. 3).
[0060]
Subsequently, when those operators perform an operation of reading the AV data respectively transferred to the SSD 2 on the editing terminal 1 on the operation screen by the editor 11, the editor 11, the IFC 12, and the FSD 13 in the editing terminal 1 use the SSD 2. The AV data transferred and recorded in the editing terminal 1 is read into the editing terminal 1 (FIG. 3).
[0061]
After the operators perform operations (cut editing, pasting on the timeline, etc.) of the read AV data on the operation screen by the editor 11, the edited AV data is written to the AV server 4. When the operation is performed, the edited AV data is transferred and recorded from the editing terminal 1 to the SSD 2 by the editor 11, IFC 12, FSD 13 in the editing terminal 1 and the gateway 32, FDL 31 in the gateway terminal 3, and then the SSD 2 Is input to the common SDI input / output port of the AV server 4 and written to the AV server 4 (FIG. 4).
[0062]
As described above, in this news production system, each of the two editing terminals 1 connected to the SSD 2 which can be accessed at a higher speed than the RAID in the AV server 4 uses the editor 11 and the IFC 12 to share the common terminal of the AV server 4. After requesting transfer of AV data from the SDI input / output port to the SSD 2, the AV data recorded on the SSD 2 is read by the editor 11 and the FSD 13, so that the AV data is read from the AV server 4 to the editing terminal 1.
[0063]
Therefore, when the AV server 4 transfers AV data from one SDI input / output port to the SSD 2, two editing terminals 1 can read AV data from the AV server 4 simultaneously and in parallel via the SSD 2. Thus, a larger number of editing terminals (two per SDI input / output port) than the number of SDI input / output ports of the AV server 4 can read AV data from the AV server 4 simultaneously and in parallel. ing.
[0064]
Further, since the AV data is output from the SDI input / output port (not transmitted from the network interface by the file transfer protocol), the AV data can be chase-played from the AV server 4 and read by the editing terminal 1. ing.
[0065]
Since the SSD 2 can be accessed at a higher speed than the RAID in the AV server 4, the waiting time when the editing terminal 2 (the editor 11 and the FSD 13) reads the AV data of the jumping frame from the SSD 2 is a jump time from the AV server 4. Is shorter than the waiting time when reading the AV data of the frame.
[0066]
Also, the gateway terminal 3 (gateway 32) stores end-of-data (EOD), which is information indicating a portion of the file in which the AV data has been recorded, in the metadata area of the file in which the SSD 2 records the AV data. Each editing terminal 1 (editor 11) reads the AV data from the portion of the file where the AV data has been recorded based on the EOD, so that the SSD 2 records the AV data in the file. Even if the editing terminal 1 reads the AV data from the SSD 2 while the file is being read, it is possible to prevent the editing terminal 1 from reading over a portion of the file in which the AV data is not yet recorded. You can also do it.
[0067]
Finally, FIG. 5 shows an example of a change in connection between the editing terminal 1, the SSD 2, and the gateway terminal 3 in this news production system.
[0068]
Of these, in the example of FIG. 5A, three editing terminals 1 are connected to the SSD 2 using all four fiber channel ports of the SSD 2. In this example, three editing terminals 1 can simultaneously read AV data from the AV server 4 for one SDI input / output port of the AV server 4.
[0069]
In the example of FIG. 5B, a plurality of editing terminals 1 and SSDs 2 are connected in a one-to-one correspondence, and each SSD 2 is connected to the gateway terminal 3 in a cascade manner. In this example, the plurality of editing terminals 1 can simultaneously read AV data from the AV server 4 for one SDI input / output port of the AV server 4.
[0070]
In the example of FIG. 5C, a plurality of editing terminals 1 and SSDs 2 are connected in a one-to-one correspondence, and each SSD 2 is connected to a gateway terminal 3 via an FC (fiber channel) switch 6. Also in this example, the plurality of editing terminals 1 can read AV data from the AV server 4 simultaneously and in parallel for one SDI input / output port of the AV server 4.
[0071]
As described above, in this news production system, transmission / reception of AV data between the gateway terminal 3, the SSD 2, and the editing terminal 1 is performed via the fiber channel. Therefore, as shown in each example of FIG. By doing so, a larger number of editing terminals 1 can read AV data from the AV server 4 simultaneously and in parallel for one SDI input / output port of the AV server 4.
[0072]
In the above example, an AV server having an SDI port is a target for reading AV data according to the present invention. However, the present invention is not limited to this, and an AV server having a synchronous input / output port other than SDI may be a target for reading AV data according to the present invention.
[0073]
In the above example, the present invention is applied to a news production system. However, the present invention is not limited to this, and may be applied to any appropriate system (for example, a production system for programs other than news, a CM production system, and a movie production system) that requires reading AV data from an AV server to an editing terminal. The invention may be applied.
[0074]
Further, the present invention is not limited to the above-described example, and it is needless to say that various other configurations can be adopted without departing from the gist of the present invention.
[0075]
【The invention's effect】
As described above, according to the reading system and the reading method according to the present invention, a larger number of editing terminals than the number of synchronous input / output ports of the AV server can simultaneously read AV data from the AV server. At the same time, there is an effect that AV data can be chased and reproduced from the AV server and read by the editing terminal, and the waiting time when the editing terminal reads the AV data of the jumping frame can be shortened.
[0076]
Further, by making a network connection utilizing the characteristics of the fiber channel, a larger number of editing terminals can simultaneously read AV data from the AV server for one synchronous I / O port of the AV server. The effect is also obtained.
[0077]
Also, when the editing terminal reads the AV data from the recording device while the recording device is recording the AV data in the file, the editing terminal reads a portion of the file in which the AV data is not yet recorded. The effect of preventing such a situation can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of a news production system to which the present invention is applied.
FIG. 2 is a diagram showing software in an editing terminal / gateway terminal of FIG. 1;
3 is a diagram showing a sequence by the software of FIG. 2 when each editing terminal of FIG. 1 reads a material from an AV server.
4 is a diagram showing a sequence by the software of FIG. 2 when each editing terminal of FIG. 1 writes an editing result to an AV server.
FIG. 5 is a diagram showing an example of changing a connection between an editing terminal, an SSD, and a gateway terminal in the system of FIG. 1;
[Explanation of symbols]
1 editing terminal, 2 SSD, 3 gateway terminal, 4 AV server, 5 Ethernet (registered trademark), 6 FC switch

Claims (6)

In a system in which a plurality of editing terminals read AV data from an AV server having AV data recording means and a synchronous input / output port,
A recording device that can be accessed at a higher speed than the recording means of the AV server and is connected to the plurality of editing terminals;
Each of the editing terminals,
First processing means for requesting transfer of AV data from the input / output port of the AV server to the recording device;
A second processing unit for reading AV data recorded in the recording device based on a request from the first processing unit. A system for reading AV data from an AV server. 2. The system for reading AV data from an AV server according to claim 1,
The recording device has a plurality of fiber channel ports,
Connected to the input / output port of the AV server while being connected to the recording device, and from the connected input / output port of the AV server based on a request from the first processing means of the editing terminal. A gateway terminal that outputs AV data, converts the format of the AV data, and records the converted data on the recording device;
A system for reading AV data from an AV server to an editing terminal, wherein the first processing means of each of the editing terminals sends a request to the gateway terminal. 3. The system for reading AV data from an AV server according to claim 2,
The gateway terminal causes a file in which the recording device records AV data to record information indicating a portion of the file in which the AV data has been recorded,
The second processing means of each of the editing terminals reads AV data from a portion of the file where AV data is recorded, based on the information in the file, wherein the AV data from the AV server is read. Reading system. In a method in which a plurality of editing terminals reads AV data from an AV server having AV data recording means and a synchronous input / output port,
Each of the editing terminals can access the input / output port of the AV server at a higher speed than the recording means of the AV server and transfer AV data to a recording device connected to the plurality of editing terminals. A first step of requesting
A second step in which each of the editing terminals reads AV data recorded in the recording device based on the request in the first step. . 5. The method for reading AV data from an AV server according to claim 4,
In the first step, each of the editing terminals sends a request to a gateway terminal connected to the recording device having a plurality of fiber channel ports and connected to the input / output port of the AV server,
The gateway terminal further includes a step of outputting AV data from the connected input / output port of the AV server based on a request from the editing terminal, converting the AV data into a format, and recording the AV data in the recording device. A method for reading AV data from an AV server. 6. The method for reading AV data from an AV server according to claim 5,
The gateway terminal further includes a step of recording information indicating a portion of the file in which the AV data is recorded, in a file in which the recording device records the AV data,
A method for reading AV data from an AV server, wherein in the second step, AV data is read from a portion of the file where AV data is recorded, based on the information in the file.

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