CN112261388A - Redundancy recovery method, device and system for satellite transmission digital film packet - Google Patents
Redundancy recovery method, device and system for satellite transmission digital film packet Download PDFInfo
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- CN112261388A CN112261388A CN202010927816.4A CN202010927816A CN112261388A CN 112261388 A CN112261388 A CN 112261388A CN 202010927816 A CN202010927816 A CN 202010927816A CN 112261388 A CN112261388 A CN 112261388A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/18—File system types
- G06F16/182—Distributed file systems
- G06F16/184—Distributed file systems implemented as replicated file system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
Abstract
The embodiment of the invention discloses a method, a device and a system for recovering redundancy of a satellite-transmitted digital cinema package. The method comprises S100, a redundancy creating module creates a redundancy recovery file set, a corresponding index file and a corresponding seed file according to an obtained digital movie package, and uploads the seed file to a seed center module, wherein the redundancy recovery file set is a par2 file; s105, the redundancy recovery module polls the index file to the redundancy creation module according to a preset period and checks the digital movie packet received by the satellite based on the index file, and if the digital movie packet is checked to be damaged, the redundancy recovery module is requested to download the redundancy recovery file; and S110, the redundancy creating module transmits the redundancy recovery file to the redundancy recovery module for data recovery through the file transmission network based on p2 p.
Description
Technical Field
The invention relates to the field of digital movies, in particular to a method, a device and a system for recovering redundancy of a satellite-transmitted digital movie packet.
Background
The characteristics of the digital copy release of the movie are as follows: 1. the amount of transmitted data is large, and one piece of data is usually 200G to 400G. In order to meet the high quality requirements of the audience on the movie image quality and sound effect, high resolution and high code stream image quality are adopted no matter shooting or post production, so that the Digital movie Package (Digital Cinema Package DCP) finally used for distribution is also getting bigger and bigger; to satisfy the viewers of different groups, the distributor will distribute the various releases of the same film at the same time, which will change the DCP package of one film into two or more. 2. The integrity requirement is high. If any bit error occurs in the received movie content, the movie cannot pass the integrity check of the server, and the movie file cannot be stored in the server. 3. One-to-many transmission, where a film release is typically sent by a distributor to all theaters showing the film nationwide, is where one sender transmits the film to thousands of receivers simultaneously. The pressure on the sending end is large in the aspects of equipment performance, sending bandwidth and the like.
Three types of transmission networks which can be used for film digital copy distribution in China are the internet (based on an IP mode), a satellite and a cable digital television network. According to the traditional transmission mode, the professional IP network has larger bandwidth and high transmission rate, is suitable for the transmission of the film digital copy with large data volume, but has high network cost, and the network cost is increased rapidly along with the increase of the number of the cinemas. The national broadcast television optical cable main line has large net bandwidth and high speed, but the existing national grid is only connected with provinces and prefectures in the country, and the problem of 'the last kilometer' exists when the provinces and the prefectures transmit the digital video to cinemas in cities and counties. The cost of laying and maintaining the optical cable in the last kilometer is high. Cable television networks have been developed in China for many years with mature technology and wide coverage, but the transmission bandwidth of one channel is only 8MHz, the transmission rate is low, and the time for transmitting digital copies of movies is very long.
In the middle and American countries, the digital film copy transmission mode widely used at present is basically a satellite network transmission mode. However, since the satellite network is a unidirectional broadcast network, and the data volume of the digital film copy is large, such interference or the like always exists in an actual channel of the satellite network, and an ideal distortion-free state cannot be achieved in practical application, it is difficult to ensure that the digital film copy completely distributes data to each terminal receiver by only one transmission in the distribution and transmission process, and once data loss or error code occurs in the transmission process, the data cannot be retrieved. After the satellite transmission is finished, if the data packet is lost or wrong, the receiver can send the data packet serial number which is not successfully received to the transmission platform from the Internet. The whole file is incomplete when the application is reissued, the schedule of the reissue needs to be re-established, the file is distributed to a small part of cinemas which do not receive the complete file, and the whole file is retransmitted, so that the bandwidth resource of the satellite central station is occupied, and the receiving time limit of the cinemas is influenced.
The distribution of the current digital movie copies is essentially the low-cost distribution of one-point-to-multipoint satellite one-way unreliable links of a huge file set facing a large-scale receiving end, and is a problem of extremely optimizing the requirements on resources, time and capital cost. With current technology development and capital time cost considerations, satellite alone, or the IP internet, cannot be optimally addressed.
Disclosure of Invention
To solve this problem, a first aspect of the present application provides a redundancy recovery method for satellite transmission of digital cinema packages, comprising
S100, a redundancy creating module creates a redundancy recovery file set, a corresponding index file and a corresponding seed file according to the obtained digital movie package, and uploads the seed file to a seed center module, wherein the redundancy recovery file set is a par2 file;
s105, the redundancy recovery module polls the index file to the redundancy creation module according to a preset period and checks the digital movie packet received by the satellite based on the index file, and if the digital movie packet is checked to be damaged, the redundancy recovery module is requested to download the redundancy recovery file;
and S110, the redundancy creating module transmits the redundancy recovery file to the redundancy recovery module for data recovery through the file transmission network based on p2 p.
In a specific embodiment, the checking the digital cinema package received through the satellite based on the index file, and if the damage is checked out, the requesting the redundancy creation module to download the redundancy recovery file includes
And the redundancy recovery module checks out the damaged blocks of the digital movie package received by the satellite, and integrally downloads the redundancy recovery file set.
In a specific embodiment, the checking the digital cinema package received through the satellite based on the index file, and if the damage is checked out, the requesting the redundancy creation module to download the redundancy recovery file includes
The redundancy recovery module verifies the digital movie packets received by the satellite based on the index file to obtain the number of blocks to be recovered;
and the redundancy recovery module initiates a request to the redundancy creation module, judges which redundancy recovery files have the block number equal to or close to the block number needing to be recovered, and downloads the corresponding redundancy recovery files.
In a particular embodiment, the method further comprises
The redundancy recovery module determines the maximum number of blocks in the redundancy recovery file provided by the redundancy creation module, if the maximum number of blocks is less than the number of blocks needing to be recovered but does not exceed the predetermined percentage of the number of blocks needing to be recovered, the redundancy recovery module initiates a request to create more redundant blocks to the redundancy creation module, and if the maximum number of blocks exceeds the predetermined percentage, the redundancy recovery module directly downloads the digital cinema packages obtained by the redundancy creation module through a file transmission network based on p2 p.
In a particular embodiment, the predetermined percentage is 50-70%.
In a particular embodiment, the redundancy restoration module requesting download of the redundancy restoration file from the redundancy creation module includes
Downloading a seed file from the seed center module;
and downloading the redundancy recovery file based on the seed file.
In a specific embodiment, step S100 further includes the redundancy creating module placing the index file on http.
In a second aspect, the present application provides a redundancy recovery apparatus for satellite transmission of digital cinema packages, comprising
Redundancy creation module, seed center module, redundancy recovery module and p2 p-based file transfer network
The redundancy creating module creates a redundancy recovery file set, a corresponding index file and a corresponding seed file according to the obtained digital movie package, and uploads the seed file to the seed center module, wherein the redundancy recovery file set is a par2 file;
the redundancy recovery module polls the index file to the redundancy creation module according to a preset period and checks the digital movie packet received by the satellite based on the index file, and if the digital movie packet is checked to be damaged, the redundancy recovery module requests the redundancy creation module to download the redundancy recovery file;
the redundancy creation module transmits the redundancy restoration file to the redundancy restoration module for data restoration through a p2 p-based file transmission network.
In one particular embodiment of the present invention,
the redundancy creating module and the seed center module are arranged in a server of a movie distribution end;
the redundancy recovery module is arranged in a server at the cinema end;
the server of the movie distribution end and the cinema end transmit data through the p2 p-based file transmission network.
In a third aspect of the present application, there is provided a redundancy recovery system for satellite transmission of digital cinema packages, comprising
Satellite transmitting terminal, satellite receiving terminal and apparatus according to the second aspect, wherein
And the satellite sending terminal sends the digital movie packet to a satellite receiving terminal.
The invention has the following beneficial effects:
according to the method, the digital movie package is transmitted through the satellite, but the damaged data package which is not successfully received is not transmitted through the satellite, the damaged data package which is not successfully received is recovered through the file transmission network based on p2p in a mode of downloading the redundancy repair files with the corresponding quantity according to the damaged quantity, namely, the files are received by the satellite end, and the recovery package is received by the internet end without secondary satellite transmission. In the face of large-scale satellite one-way unreliable link distribution of receiving terminals, in order to avoid bandwidth bottlenecks and the like caused by centralized transmission, a p2 p-based decentralized mode is adopted to transmit redundant repair files, so that the cost of a transmitting terminal is reduced, a large number of receiving terminals are supported, required files are downloaded according to needs, the transmission quantity and bandwidth pressure of the internet are further reduced, and the satellite-based comprehensive solution for distributing large files at one time is combined with the advantages of satellites. The method is characterized in that a Par2 file is generated by utilizing a Parchip (comprehensive parity archive and adopting parity volume set specification) open source specification system, any file data damage which does not exceed the redundancy amount in the satellite transmission process can be recovered through a redundancy recovery volume file after a recovery volume of an application layer file level is adopted, and the cost and the transmission time are reduced by downloading according to the damage amount.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a hardware architecture diagram of a redundancy recovery method for satellite-transmitted digital cinema packages according to one embodiment of the present invention.
Fig. 2 shows a flow diagram of a method for redundancy recovery of satellite-transmitted digital cinema packages according to one embodiment of the present invention.
FIG. 3 illustrates a timing diagram for downloading a redundant restore file according to one embodiment of the present invention.
FIG. 4 illustrates a timing diagram for implementing downloading a redundant restore file according to another embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Fig. 1 shows a hardware architecture diagram for implementing the redundancy recovery method for satellite-delivered digital cinema packages of the present application. As shown in fig. 1, a movie distribution terminal 10, such as china movie companies, transmits Digital movie packages (Digital Cinema Package DCP) to satellite substations 140 of various Cinema terminals 14 via satellites 12. The number of movie ends is 1 in the figure, however, those skilled in the art can understand that in the actual application scenario, the number of movie ends is multiple, for example, the movie ends are distributed in various cities.
A redundancy creation module, also referred to as a redundancy creation node pserver, provided in the server of the movie distribution terminal 10: the node obtains the file directory with the original and complete DCP files from the distribution end, can execute the command to create redundancy, and can distribute to the remaining nodes that need redundancy recovery files.
Redundancy creation service psapi: on the pserver node, it is responsible for scheduling notifications and creating redundant restore files and distributing them through p2 p.
In one particular example, the psapi is a daemon serving the 8089 port, which may be written in the go language that excels in API development.
The redundant recovery module that sets up in cinema end server also is called recovery node pclient: namely, the nodes which have damaged file directories after satellite transmission and need to be recovered. Wherein the theatre end typically includes a Theatre Management System (TMS) server. The redundancy recovery module of the application can be arranged in the TMS server and can also be arranged in another server, and the application does not limit the redundancy recovery module.
Redundancy restoration service papi: and the pclient recovery node is responsible for scheduling notification, downloading redundant recovery files, checking and recovering directory files.
In one specific example, papi is a daemon serving the 8090 port, which may be written in the go language that excels in API development.
The redundancy creation node pserver and the redundancy recovery node pclient can be a Server/Client (Server/Client) architecture, and communication and information exchange are facilitated.
The hardware architecture of the present application also includes a p2 p-based file transfer network 16, also referred to herein as a BFT network, for establishing data communications between the movie delivery end 10 and the various theatre ends 14. The distribution of redundant restore files is through an decentralized p2p network.
Seed center module: because the redundant restore file is transmitted through p2p, its seed needs to be issued or uniformly managed for storing the redundant restore file seed.
In an alternative example, the seed center module may be in the same server as the pserver.
Fig. 2 illustrates a method for redundancy recovery of satellite-delivered digital cinema packages according to one embodiment of the present application, comprising the following steps.
S100, the redundancy creating module creates a redundancy recovery file set, a corresponding index file and a corresponding seed file according to the obtained digital movie package, and uploads the seed file to the seed center module, wherein the redundancy recovery file set is a par2 file.
In one aspect, the movie distribution end transmits the DCP to satellite substations 140 at various theater ends via satellite. On the other hand, pserver obtains the same DCP from the publisher.
In a specific example, the pserver obtains a complete and correct directory, informs the psapi service, informs a complete directory path, and the psapi service starts to create a redundant recovery file; starting the p2p transmission, and putting the index file on Http; and after the completion, a completion mark is generated or the service end is actively informed, a seed file is generated, the seed is uploaded to the seed center module, and then the p2p service can be started.
The generation of the index file in the application utilizes parity (integrated parity archive) as an open source specification system, and generates a par2 file.
The redundancy of the redundant recovery file may be a fixed default value, such as 10% (estimated based on the actual average error rate of the daily satellite transmissions, which may be adjusted).
Parchieve, originally designed to address the problem of reliable file sharing by Usenet, is now commonly used to protect against arbitrary data corruption. Parchieve uses a method for error detection and correction, specifically Reed-Solomon code error correction. In the present application, the reed-solomon principle is utilized to achieve recovery at the application level file level. The redundant data in the par2 file was calculated using Reed-Solomon codes. These codes may take a set of equal-sized data blocks and generate several equal-sized recovery blocks. The original data blocks may then be regenerated given a subset of the original data blocks and some recovery blocks. Reed-Solomon codes can perform this recovery as long as the number of lost data blocks does not exceed the number of recovered blocks.
The Parchieve system is based on the idea that corrupted or missing data can be repaired as long as there is enough redundant information (parity). Parchieve treats a group of data files as one large collection of data, divided into fixed-size chunks (blocks). When the Parchip program processes data, it creates enough parity data for restoring the blocks. This redundant restoration data is then stored in the par2 file.
According to the method and the device, the bandwidth pressure of the internet sending end is reduced through the P2P network protocol, and the problems of recovery and integrity of huge file sets of satellite substations at a plurality of receiving ends are solved.
In one specific example, seeding time for p2p is set to end at 1-2 days. The associated redundancy restoration file is then deleted (since it makes little sense to download the redundancy after a certain time of satellite reception).
par2 has an index file format xx, par2 seeded by the respective redundant restore torrent files, which are small enough to support high concurrency, short downloads, all placed on the http service for easy downloads. The file corresponding to the seed is transmitted through the BFT network of p2 p.
Still another scheme is to distribute files through an interface of a service end, but the independence and loose coupling characteristics of a redundancy recovery scheme are lost, so that if migration or maintenance is inconvenient later, the change of the service end is easy to cause influence, and is not independent and simple enough, so http is preferably adopted for distribution.
If a copy of the original data is available before the satellite transmission is complete, the creation of the redundant recovery file can be done during the satellite transmission. The redundancy recovery file can be obtained before the receiving end starts to recover data, only one redundancy recovery time is different from the time when the first data is received to the time when the data is completely recovered, the whole time is greatly shortened, otherwise, if the data is transmitted from the satellite, the total time is equal to the time for creating the redundancy plus the transmission time and the redundancy recovery time.
S105, the redundancy recovery module polls the index file to the redundancy creation module according to a predetermined period and checks the digital cinema package (shown as DCPX in fig. 1) received through the satellite based on the index file, and if the digital cinema package is checked to be damaged, requests the redundancy creation module to download the redundancy recovery file.
In a specific example, as shown in fig. 3, if the redundancy restoration module checks out that the digital cinema package received via the satellite has a damaged block, the redundancy restoration file set is downloaded as a whole.
And (3) presetting a fixed redundancy, such as 5% -15%, at the pserver node according to the satellite transmission damage characteristics to generate a redundant recovery file set, and uniformly downloading and recovering only when the pclient node finds a damaged block, and not recovering when the redundancy percentage exceeds.
In another specific example, as shown in FIG. 4, the present application proposes an on-demand download scheme.
At the pserver node, a relatively large set of redundant recovery files is generated (which may be generated 2 times, and may be generated 1 time when the satellite transmission time is long.
And verifying the digital movie package received by the satellite by the pclient node based on the index file to obtain the number of blocks to be recovered.
In a specific example, after obtaining a damaged original file, the pclient node downloads an index par2 file corresponding to a directory name or a file name or a par2 file at least containing 1 recovery block, and firstly checks the original data file through the index file or any one of the par2 files to obtain the number of blocks to be recovered.
And the redundancy recovery module initiates a request to the redundancy creation module, judges which redundancy recovery files have the block number equal to or close to the block number needing to be recovered, and downloads the corresponding redundancy recovery files.
For example, the maximum number of block files provided by the sender is first determined, and the corresponding number of par2 files is downloaded. E.g. 10 bad blocks, at least 16 blocks of the par2 file or 8+2 of the par2 file are downloaded.
The redundancy recovery module determines the maximum number of blocks in the redundancy recovery file provided by the redundancy creation module, if the maximum number of blocks is less than the number of blocks needing to be recovered but does not exceed the predetermined percentage of the number of blocks needing to be recovered, the redundancy recovery module initiates a request to create more redundant blocks to the redundancy creation module, and if the maximum number of blocks exceeds the predetermined percentage, the redundancy recovery module directly downloads the digital cinema packages obtained by the redundancy creation module through a file transmission network based on p2 p.
For example, if the number of files for all the seeds does not satisfy the number of error blocks, but does not exceed 50-70% (more preferably 50%), then a request is initiated to the pserver to create more redundant blocks and then awaits download.
If the data loss exceeds 50%, for example, the data loss at the satellite receiving end is excessive, which is an abnormal condition, meaning that the meaning of network redundancy pack is lost, the satellite end station needs to be informed to perform hardware recovery, and meanwhile, the file is transmitted by other schemes, for example, the original file is directly downloaded through a p2p network, and the same time is also achieved.
Through the scheme shown in fig. 4, the redundant recovery file distinguishes the number of recovery blocks according to the file name, the number of recovery blocks contained in each file is increased by multiple, and the downloaded redundant recovery file name can be determined according to the number of damaged blocks of any original file, so that the redundant recovery file name can be downloaded on an application layer as needed, and the redundant recovery file can be recovered according to the number of damaged or lost blocks, thereby realizing downloading on demand.
In one particular example, the redundancy restoration module requesting download of the redundancy restoration file from the redundancy creation module includes
Downloading a seed file from the seed center module;
and downloading the redundancy recovery file based on the seed file.
And S110, the redundancy creating module transmits the redundancy recovery file to the redundancy recovery module for data recovery through the file transmission network based on p2 p.
Since the redundancy recovery volume can recover any error, a plurality of receiving ends with errors at different positions are also supported.
In order to shorten the overall time, the following two measures can be considered.
Under the condition that the proportion of the data received by the satellite is certain, if a larger block size can be used, certain guarantee can be provided on the speed of creation, verification and recovery, and the data recovery is completed within the time required by the service. If the block size can be reduced, the amount of data transmitted through p2p can be greatly reduced, the total amount of data transmitted through the internet for redundant data is reduced, and the transmission time and the total network traffic are reduced. Therefore, a better block size, balancing the time required for redundancy recovery and the total flow of network transmission files need to be obtained through testing. (default 2000 blocks, when size is not specified, will change with the size of the transfer file, the time required will need to be adequately tested according to the specific machine configuration.)
For the p2p transmission process, downloading can be performed in sequence, and when a complete par2 file exists and the block required by recovery can be met, recovery can be started immediately without waiting for the complete set of par2 redundant downloading.
If the number of redundant restore files is not sufficient to restore the content, then the required number continues to be downloaded through p2 p. This is an abnormal situation if the creating node cannot provide the required number of redundant recovery files, because the creating node creates enough redundancy (for example, 50%), indicating that the satellite receiving end has lost too much data. The satellite terminal site needs to be informed to recover the hardware, and other schemes are used for transmitting files at the same time.
And S115, the redundancy recovery module informs the satellite receiving terminal that the redundancy recovery is successful.
Through the main scheme and the optional embodiment of the application, the following can be realized:
1. the file level redundancy is realized, the redundancy file is transmitted by combining the Internet, the unreliability in satellite channel transmission is solved, and the one-time repair is carried out through the redundancy file without satellite retransmission.
2. And the redundancy recovery file is downloaded as required, so that the internet pressure and cost of the sending end are reduced.
3. The method is loosely coupled with the satellite transmitting terminal technology, is compatible with a transmission system and does not influence each other.
4. The redundant recovery file is distributed through a BFT network based on a p2p protocol, so that the cost of a sending end is further reduced, and a large number of receiving ends are supported.
5. The following steps are carried out in parallel: the satellite end receives the file, and the BFT receives the recovery packet.
6. After receiving the file, the file is recovered by error without secondary distribution.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A redundancy recovery method for a satellite-transmitted digital movie package is characterized by comprising S100, a redundancy creating module creates a redundancy recovery file set, a corresponding index file and a corresponding seed file according to the obtained digital movie package, and uploads the seed file to a seed center module, wherein the redundancy recovery file set is a par2 file;
s105, the redundancy recovery module polls the index file to the redundancy creation module according to a preset period and checks the digital movie packet received by the satellite based on the index file, and if the digital movie packet is checked to be damaged, the redundancy recovery module is requested to download the redundancy recovery file;
and S110, the redundancy creating module transmits the redundancy recovery file to the redundancy recovery module for data recovery through the file transmission network based on p2 p.
2. The method of claim 1, wherein the verifying the digital cinema package received via the satellite based on the index file, and if the corruption is verified, requesting a redundancy creation module to download a redundancy restoration file comprises
And the redundancy recovery module checks out the damaged blocks of the digital movie package received by the satellite, and integrally downloads the redundancy recovery file set.
3. The method of claim 1, wherein the verifying the digital cinema package received via the satellite based on the index file, and if the corruption is verified, requesting a redundancy creation module to download a redundancy restoration file comprises
The redundancy recovery module verifies the digital movie packets received by the satellite based on the index file to obtain the number of blocks to be recovered;
and the redundancy recovery module initiates a request to the redundancy creation module, judges which redundancy recovery files have the block number equal to or close to the block number needing to be recovered, and downloads the corresponding redundancy recovery files.
4. The method of claim 3, further comprising
The redundancy recovery module determines the maximum number of blocks in the redundancy recovery file provided by the redundancy creation module, if the maximum number of blocks is less than the number of blocks needing to be recovered but does not exceed the predetermined percentage of the number of blocks needing to be recovered, the redundancy recovery module initiates a request to create more redundant blocks to the redundancy creation module, and if the maximum number of blocks exceeds the predetermined percentage, the redundancy recovery module directly downloads the digital cinema packages obtained by the redundancy creation module through a file transmission network based on p2 p.
5. The method of claim 4, wherein the predetermined percentage is 50-70%.
6. The method of claim 1, wherein the redundancy restoration module requesting the redundancy creation module to download the redundancy restoration file comprises
Downloading a seed file from the seed center module;
and downloading the redundancy recovery file based on the seed file.
7. The method according to any of claims 1-6, wherein step S100 further comprises a redundancy creation module placing the index file on http.
8. A redundancy recovery device for satellite transmission digital film packets is characterized by comprising a redundancy creation module, a seed center module, a redundancy recovery module and a p2 p-based file transmission network, wherein the redundancy creation module, the seed center module, the redundancy recovery module and the file transmission network are connected in series
The redundancy creating module creates a redundancy recovery file set, a corresponding index file and a corresponding seed file according to the obtained digital movie package, and uploads the seed file to the seed center module, wherein the redundancy recovery file set is a par2 file;
the redundancy recovery module polls the index file to the redundancy creation module according to a preset period and checks the digital movie packet received by the satellite based on the index file, and if the digital movie packet is checked to be damaged, the redundancy recovery module requests the redundancy creation module to download the redundancy recovery file;
the redundancy creation module transmits the redundancy restoration file to the redundancy restoration module for data restoration through a p2 p-based file transmission network.
9. The apparatus of claim 8,
the redundancy creating module and the seed center module are arranged in a server of a movie distribution end;
the redundancy recovery module is arranged in a server at the cinema end;
the server of the movie distribution end and the cinema end transmit data through the p2 p-based file transmission network.
10. A redundancy recovery system for satellite transmission of digital cinema packages, comprising
Satellite transmitting terminal, satellite receiving terminal and apparatus according to claim 8 or 9, wherein the satellite transmitting terminal transmits the digital cinema package to the satellite receiving terminal.
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| CN114637870A (en) * | 2022-03-14 | 2022-06-17 | 重庆大学 | Image data processing method, device, equipment and storage medium |
| CN115174955A (en) * | 2022-05-25 | 2022-10-11 | 楼培德 | Future network based national high-speed digital cinema distribution system |
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