CN117119157A - Multi-picture splicing retransmission method and system for optical fiber video seat - Google Patents
Multi-picture splicing retransmission method and system for optical fiber video seat Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims abstract description 65
- 230000003287 optical effect Effects 0.000 claims description 48
- 238000006243 chemical reaction Methods 0.000 claims description 38
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- 238000005516 engineering process Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 8
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/2624—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects for obtaining an image which is composed of whole input images, e.g. splitscreen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
Abstract
The invention discloses a multi-picture splicing retransmission method and a multi-picture splicing retransmission system for an optical fiber video seat, wherein the method comprises the following steps: the method comprises the steps of carrying out lossless compression-free encoding on the acquired multi-path video data, sending the multi-path video data through an optical fiber, receiving the multi-path video data through a preset first video exchange card, sending the multi-path video data to a second video exchange card according to an upper-layer software configuration, decoding video streams of the multi-path video data through the second video exchange card to obtain a plurality of corresponding first video streams, carrying out image splicing on the plurality of first video streams to obtain a second video stream, obtaining an output configuration sent by the upper-layer software configuration through the second video exchange card, and transmitting the video stream to be played according to the output configuration, so that transmission delay is reduced, safety and privacy of video transmission are improved, and meanwhile, display of the multi-path video is realized.
Description
Technical Field
The invention relates to the technical field of video transmission and processing, in particular to a multi-picture splicing retransmission method and a multi-picture splicing retransmission system for an optical fiber video seat.
Background
The video seat system is used for multipath video remote transmission, realizes man-machine separation to perform video browsing, management, monitoring and switching, different sending boxes of HDMI (high-definition multimedia interface) signal access systems of different video sources in the existing video seat system are connected to a switch through a network cable after video is compressed and encoded into network streams by each video sending box, the switch is connected to a plurality of receiving boxes through the network cable at the same time, each receiving box is connected with a display through an HDMI (high-definition multimedia interface), and the receiving boxes can receive video network streams of the sending boxes to decode and finally display video pictures of the sending boxes on the display. The user can make the receiving box receive different sending box video network flows through the configuration switch, and different video source pictures are displayed on the display.
However, most video agent transmission terminal devices in the market today transmit video through network cables and network packets, and because the network bandwidth cannot meet the original video data bandwidth, the network transmission process can perform lossy compression on video data, so that the video agent transmission terminal device has higher coding delay and greatly reduces the picture quality of terminal display pictures due to lossy compression, meanwhile, the existing video agent needs to be connected to a switch of a third party, and the network protocol packets are public protocols, the privacy and the security of the transmission process are lower, the video agent has a one-to-one relationship, and a plurality of pictures of sending boxes cannot be displayed at one receiving box terminal at the same time.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a multi-picture splicing retransmission method and a multi-picture splicing retransmission system for an optical fiber video seat, which can reduce transmission delay, improve video transmission safety and privacy and realize multi-channel video display.
In order to achieve the above purpose, the invention discloses a multi-picture splicing retransmission method of an optical fiber video seat, which comprises the following steps:
respectively carrying out lossless compression-free encoding on each path of first video data in the acquired paths of first video data to obtain a plurality of paths of second video data, and transmitting the paths of second video data through optical fibers;
receiving the plurality of paths of second video data through a preset first video exchange card, and performing high-speed signal conversion on each path of second video data in the plurality of paths of second video data to obtain a plurality of paths of second high-speed video data;
determining a second video exchange card according to a conversion configuration sent by an upper software configuration, forwarding the plurality of paths of second high-speed video data to the second video exchange card through the first video exchange card, and decoding video streams of the plurality of paths of second high-speed video data through the second video exchange card to obtain a plurality of corresponding first video streams after video stream decoding of each path of second high-speed video data in the plurality of paths of second high-speed video data;
Performing image splicing on the plurality of first video streams through an image splicing recoding processing technology preset in the second video exchange card to obtain second video streams;
and acquiring an output configuration sent by the upper software configuration through the second video exchange card, determining a video stream to be played from the second video stream and the plurality of first video streams according to the output configuration, and transmitting the video stream to be played through the second video exchange card.
The invention discloses a multi-picture splicing retransmission method of an optical fiber video agent, which comprises the steps of firstly, respectively carrying out lossless compression-free coding on each path of first video data in a plurality of paths of first video data, thereby ensuring that the video is not damaged in the transmission process, ensuring that the image quality of the video is consistent with that of a source video when the video is displayed, then, after coding the video signal, sending the video signal through an optical fiber, reducing the transmission delay, improving the video transmission speed, after sending the multi-path video data, utilizing a preset first video exchange card to receive the plurality of paths of first video data, converting each path of first video data in the plurality of paths of first video data into high-speed video data, improving the video transmission speed, determining a second video exchange card after the first video exchange card receives the high-speed video signal, and forwarding the received high-speed video data to the second video exchange card, so that the video data is decoded by the second video exchange card, the corresponding video stream is output, the plurality of video streams are spliced by a preset image splicing recoding processing technology to obtain a second video stream spliced by the plurality of video streams, and the first video stream and the second video stream are respectively displayed according to the output configuration of the second video exchange device. The simultaneous display of multiple paths of videos is realized.
As a preferred example, the lossless non-compression encoding is performed on each of the acquired first video data, respectively, including:
receiving the plurality of paths of first video data, and caching each path of first video data in the plurality of paths of first video data;
acquiring field synchronizing signals respectively corresponding to each path of first video data, and generating control signals respectively corresponding to each path of first video data according to the field synchronizing signals; the control signals comprise a video frame start signal, a video frame end signal and a video invalid data signal;
binary coding is respectively carried out on each path of first video data in the plurality of paths of first video data, and coding data respectively corresponding to each path of first video data is obtained;
and combining the coded data and the control signals respectively corresponding to each path of first video data to obtain second video data respectively corresponding to each path of first video data.
The invention stores each path of first video data in the plurality of paths of first video data, then generates a control signal corresponding to the current video data through the field synchronous signal of each path of first video data, so that whether the current video data is valid video data or invalid video data is judged according to the control signal, and meanwhile, the start and the end of the current video transmission are judged according to the control signal.
As a preferred example, the receiving the plurality of paths of second video data through the preset first video switch card, and performing high-speed signal conversion on each path of second video data in the plurality of paths of second video data includes:
receiving each path of second video data in the plurality of paths of second video data through an optical module preset in the first video exchange card respectively, and transmitting each path of second video data to a first exchange chip of a backboard of the first video exchange card through an FPGA chip preset in the first video exchange card respectively;
and receiving each path of second video data through a first high-speed signal interface preset on the first exchange chip, and respectively performing high-speed signal conversion on each path of second video data to obtain a plurality of paths of second high-speed video data corresponding to the plurality of paths of second video data.
The invention utilizes the optical module to receive the coded video signal, reduces the transmission delay for the optical module through the transmission medium, and then sets the exchange chip in the first video exchange card to exchange video with any other video exchange card, thereby realizing video transmission of non-network transmission, ensuring the privacy and safety of video transmission, and further, setting a high-speed signal interface on the exchange chip, and improving the speed of data transmission.
As a preferred example, determining, at the conversion configuration sent according to the upper layer software configuration, a second video switch card, forwarding, by the first video switch card, the plurality of paths of second high-speed video data to the second video switch card, includes:
receiving conversion configuration sent by the upper layer software configuration through the first exchange chip, and determining the second video exchange card according to the conversion configuration;
and forwarding each path of second high-speed video data in the paths of second high-speed video data to a second switching chip connected back to the second video switching card through the first switching chip.
The invention realizes the video full-exchange switching between any video exchange cards by using the exchange chip, realizes the private transmission of non-network transmission, and the private transmission is determined by the configuration of private upper software, thereby protecting the safety and privacy of the video data in the transmission process.
As a preferred example, the decoding the video stream of the plurality of paths of second high-speed video data by the second video switch card includes:
receiving a plurality of paths of second high-speed video data sent by the first exchange chip through a second high-speed interface preset in the second exchange chip, and quasi-converting serial data included in the plurality of paths of second high-speed video data into parallel data to obtain a plurality of paths of second high-speed video parallel data corresponding to the plurality of paths of second high-speed video data;
And acquiring control signals respectively corresponding to each path of second high-speed video parallel data in the paths of second high-speed video parallel data, and performing video decoding on the path of currently corresponding second high-speed video parallel data according to the control signals to acquire first video streams respectively corresponding to each path of second high-speed video parallel data.
The invention receives the high-speed serial video data sent by the first video switching card through the high-speed interface positioned in the second video switching card, changes the serial data into parallel data for simultaneously carrying out video decoding on the multi-path video data, decodes the corresponding video signals in sequence according to the control signals in the video signals when carrying out video decoding, judges the start frame and the end frame in the video signals and the invalid data positioned in the video signals, and further obtains each path of video stream respectively corresponding to each path of video signals.
As a preferred example, the image splicing of the plurality of first video streams by the image splicing recoding processing technology preset in the second video switch card includes:
continuously generating a vertical synchronization pulse signal according to fixed frequency through an FPGA chip preset on the second video exchange card, and updating a preset horizontal counter value and a preset vertical counter value according to the vertical synchronization pulse signal;
Sequentially reading each first video stream in the plurality of first video streams according to the horizontal counter value and the vertical counter value, and determining two-dimensional coordinates corresponding to each first video stream according to the horizontal counter value and the vertical counter value corresponding to each first video stream respectively;
and splicing the first video streams according to the two-dimensional coordinates corresponding to each first video stream respectively to obtain second video streams obtained after the first video streams are spliced.
According to the method and the device, a horizontal count value and a vertical count value corresponding to each first video are generated through a preset horizontal counter and a preset vertical counter, two-dimensional coordinates corresponding to the current first video when the terminal is displayed are determined according to the horizontal count value and the vertical count value, the first videos are spliced according to the two-dimensional coordinates corresponding to each first video, and then a second video generated after the first videos are spliced is formed, so that multi-picture playing is achieved.
As a preferred example, determining a video stream to be played from the second video stream and the plurality of first video streams according to the output configuration includes:
Receiving output configuration sent by the upper layer software configuration through an optical module preset in the second video exchange card, and determining a video stream to be transmitted from the second video stream and the plurality of first video streams according to the output configuration;
and receiving the video stream to be transmitted through a second exchange chip preset in the second video exchange card, and sending the video stream to be transmitted to a video display terminal connected with the second video exchange card to display the video stream to be transmitted.
The invention determines the video to be output by receiving the configuration instruction sent by the upper software configuration, and then sends the video to be output to the video display terminal connected with the second video exchange card so as to display the video to be output, thereby completing the remote transmission of the video and simultaneously realizing that one video display terminal simultaneously displays a plurality of video pictures.
On the other hand, the invention also discloses an optical fiber video seat multi-picture splicing retransmission system, which comprises a code sending module, a receiving and converting module, a video exchanging module, a video splicing module and a video transmission module;
the coding and transmitting module is used for respectively carrying out lossless and compression-free coding on each path of first video data in the acquired paths of first video data to acquire the paths of second video data, and transmitting the paths of second video data through optical fibers;
The receiving conversion module is used for receiving the plurality of paths of second video data through a preset first video exchange card, and carrying out high-speed signal conversion on each path of second video data in the plurality of paths of second video data to obtain a plurality of paths of second high-speed video data;
the video exchange module is used for determining a second video exchange card according to conversion configuration sent by upper software configuration, forwarding the plurality of paths of second high-speed video data to the second video exchange card through the first video exchange card, and decoding video streams of the plurality of paths of second high-speed video data through the second video exchange card to obtain a plurality of corresponding first video streams after video stream decoding is respectively carried out on each path of second high-speed video data in the plurality of paths of second high-speed video data;
the video splicing module is used for carrying out image splicing on the plurality of first video streams through an image splicing recoding processing technology preset in the second video exchange card to obtain a second video stream;
the video transmission module is used for acquiring the output configuration sent by the upper software configuration through the second video exchange card, determining a video stream to be played from the second video stream and the plurality of first video streams according to the output configuration, and transmitting the video stream to be played through the second video exchange card.
The invention discloses an optical fiber video seat multi-picture splicing retransmission system, which firstly carries out lossless compression coding on each path of first video data in a plurality of paths of acquired first video data, thereby ensuring that the video is not damaged in the transmission process, ensuring that the picture quality of the video is consistent with that of a source video when in display, then after coding the video signals, transmitting the video signals through optical fibers, reducing transmission delay, improving the video transmission speed, after transmitting the multi-path video data, receiving the paths of first video data by using a preset first video exchange card, converting each path of first video data in the paths of first video data into high-speed video data, improving the video transmission speed, determining a second video exchange card after the first video exchange card receives the high-speed video signals, transmitting the received high-speed video data into the second video exchange card, decoding the video data through the second video exchange card, outputting corresponding video streams, and transmitting the multi-picture splicing streams through the preset first video exchange card, simultaneously obtaining a plurality of video exchange video streams through the first video exchange card, and a plurality of video exchange terminal splicing devices, and the invention can realize the two-picture splicing and two-picture splicing devices which are respectively arranged in the two-picture splicing terminal, and the two-picture splicing device can realize the two-picture splicing video terminal and the two-picture splicing device which can realize the two-picture splicing and the two-picture splicing processing, the simultaneous display of multiple paths of videos is realized.
As a preferable example, the code transmitting module includes a buffer unit, a signal unit and a coding unit;
the buffer unit is used for receiving the plurality of paths of first video data and buffering each path of first video data in the plurality of paths of first video data;
the signal unit is used for acquiring field synchronizing signals respectively corresponding to each path of first video data and generating control signals respectively corresponding to each path of first video data according to the field synchronizing signals; the control signals comprise a video frame start signal, a video frame end signal and a video invalid data signal;
the encoding unit is used for respectively binary encoding each path of first video data in the plurality of paths of first video data to obtain encoded data respectively corresponding to each path of first video data; and combining the coded data and the control signals respectively corresponding to each path of first video data to obtain second video data respectively corresponding to each path of first video data.
The invention stores each path of first video data in the plurality of paths of first video data, then generates a control signal corresponding to the current video data through the field synchronous signal of each path of first video data, so that whether the current video data is valid video data or invalid video data is judged according to the control signal, and meanwhile, the start and the end of the current video transmission are judged according to the control signal.
As a preferable example, the reception conversion module includes a signal reception unit and a signal conversion unit;
the signal receiving unit is used for respectively receiving each path of second video data in the plurality of paths of second video data through an optical module preset in the first video exchange card, and respectively transmitting each path of second video data to a first exchange chip of the first video exchange card backboard through an FPGA chip preset in the first video exchange card;
the signal conversion unit is used for receiving each path of second video data through a first high-speed signal interface preset on the first exchange chip, and respectively carrying out high-speed signal conversion on each path of second video data to obtain a plurality of paths of second high-speed video data corresponding to the plurality of paths of second video data.
The invention utilizes the optical module to receive the coded video signal, reduces the transmission delay for the optical module through the transmission medium, and then sets the exchange chip in the first video exchange card to exchange video with any other video exchange card, thereby realizing video transmission of non-network transmission, ensuring the privacy and safety of video transmission, and further, setting a high-speed signal interface on the exchange chip, and improving the speed of data transmission.
Drawings
Fig. 1: the embodiment of the invention provides a flow diagram of an optical fiber video seat multi-picture splicing retransmission method;
fig. 2: the embodiment of the invention provides a structural schematic diagram of an optical fiber video seat multi-picture splicing retransmission system;
fig. 3: the invention provides a flow diagram of an optical fiber video seat multi-picture splicing retransmission method;
fig. 4: a schematic structural diagram of a functional module of a video sending box device is provided for a further embodiment of the present invention;
fig. 5: a schematic structural diagram of a video switch card functional module is provided for a further embodiment of the present invention;
fig. 6: a schematic structural diagram of a functional module of a video receiving box device is provided for a further embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment of the invention discloses an optical fiber video seat multi-picture splicing retransmission method, and the specific implementation process of the retransmission method is shown in fig. 1, and mainly comprises steps 101 to 105, wherein the steps mainly comprise:
step 101: and respectively carrying out lossless compression-free encoding on each path of first video data in the acquired paths of first video data to obtain a plurality of paths of second video data, and transmitting the paths of second video data through optical fibers.
In this embodiment, the steps mainly include: receiving the plurality of paths of first video data, and caching each path of first video data in the plurality of paths of first video data; acquiring field synchronizing signals respectively corresponding to each path of first video data, and generating control signals respectively corresponding to each path of first video data according to the field synchronizing signals; the control signals comprise a video frame start signal, a video frame end signal and a video invalid data signal; binary coding is respectively carried out on each path of first video data in the plurality of paths of first video data, and coding data respectively corresponding to each path of first video data is obtained; and combining the coded data and the control signals respectively corresponding to each path of first video data to obtain second video data respectively corresponding to each path of first video data.
In this embodiment, the step stores each of the plurality of paths of first video data, then generates a control signal corresponding to the current video data by using a field synchronization signal of each path of first video data, so that whether the current video data is valid video data or invalid video data is determined according to the control signal, and determines the start and end of the current video data according to the control signal.
Step 102: and receiving the plurality of paths of second video data through a preset first video exchange card, and performing high-speed signal conversion on each path of second video data in the plurality of paths of second video data to obtain a plurality of paths of second high-speed video data.
In this embodiment, the steps mainly include: receiving each path of second video data in the plurality of paths of second video data through an optical module preset in the first video exchange card respectively, and transmitting each path of second video data to a first exchange chip of a backboard of the first video exchange card through an FPGA chip preset in the first video exchange card respectively; and receiving each path of second video data through a first high-speed signal interface preset on the first exchange chip, and respectively performing high-speed signal conversion on each path of second video data to obtain a plurality of paths of second high-speed video data corresponding to the plurality of paths of second video data.
In this embodiment, the step uses the optical module to receive the encoded video signal, reduces the transmission delay for the optical module through the transmission medium, and then sets an exchange chip in the first video exchange card to exchange video with any other video exchange card, so as to realize video transmission of non-network transmission, ensure the privacy and safety of video transmission, and further set a high-speed signal interface on the exchange chip, thereby improving the speed of data transmission.
Step 103: and determining a second video exchange card according to the conversion configuration sent by the upper software configuration, forwarding the plurality of paths of second high-speed video data to the second video exchange card through the first video exchange card, and decoding video streams of the plurality of paths of second high-speed video data through the second video exchange card to obtain a plurality of corresponding first video streams after video stream decoding of each path of second high-speed video data in the plurality of paths of second high-speed video data.
In this embodiment, the steps mainly include: receiving conversion configuration sent by the upper layer software configuration through the first exchange chip, and determining the second video exchange card according to the conversion configuration; forwarding each path of second high-speed video data in the paths of second high-speed video data to a second switching chip connected back to the second video switching card through the first switching chip; receiving a plurality of paths of second high-speed video data sent by the first exchange chip through a second high-speed interface preset in the second exchange chip, and quasi-converting serial data included in the plurality of paths of second high-speed video data into parallel data to obtain a plurality of paths of second high-speed video parallel data corresponding to the plurality of paths of second high-speed video data; and acquiring control signals respectively corresponding to each path of second high-speed video parallel data in the paths of second high-speed video parallel data, and performing video decoding on the path of currently corresponding second high-speed video parallel data according to the control signals to acquire first video streams respectively corresponding to each path of second high-speed video parallel data.
In this embodiment, the step uses the switch chip to implement video full-switch between any video switch cards, so as to implement private transmission of non-network transmission, and the private transmission is determined by private upper software configuration, so that security and privacy of video data are protected in the transmission process, meanwhile, high-speed serial video data sent by a first video switch card is received through a high-speed interface located in a second video switch card, serial data are changed into parallel data to simultaneously perform video decoding on multiple paths of video data, when performing video decoding, corresponding video signals are sequentially decoded according to control signals in the video signals, a start frame and an end frame in the video signals and invalid data located in the video signals are judged, and then each path of video stream corresponding to each path of video signal is obtained.
Step 104: and performing image splicing on the plurality of first video streams through an image splicing recoding processing technology preset in the second video exchange card to obtain second video streams.
In this embodiment, the steps mainly include: continuously generating a vertical synchronization pulse signal according to fixed frequency through an FPGA chip preset on the second video exchange card, and updating a preset horizontal counter value and a preset vertical counter value according to the vertical synchronization pulse signal; sequentially reading each first video stream in the plurality of first video streams according to the horizontal counter value and the vertical counter value, and determining two-dimensional coordinates corresponding to each first video stream according to the horizontal counter value and the vertical counter value corresponding to each first video stream respectively; and splicing the first video streams according to the two-dimensional coordinates corresponding to each first video stream respectively to obtain second video streams obtained after the first video streams are spliced.
In this embodiment, the step generates a horizontal count value and a vertical count value corresponding to each first video through a preset horizontal counter and a vertical counter, further determines two-dimensional coordinates corresponding to the current first video when the terminal is displayed according to the horizontal count value and the vertical count value, and splices the plurality of first videos according to the two-dimensional coordinates corresponding to each first video, thereby forming a second video generated after the plurality of first videos are spliced, and therefore multi-picture playing is achieved.
Step 105: and acquiring an output configuration sent by the upper software configuration through the second video exchange card, determining a video stream to be played from the second video stream and the plurality of first video streams according to the output configuration, and transmitting the video stream to be played through the second video exchange card.
In this embodiment, the steps mainly include: receiving output configuration sent by the upper layer software configuration through an optical module preset in the second video exchange card, and determining a video stream to be transmitted from the second video stream and the plurality of first video streams according to the output configuration; and receiving the video stream to be transmitted through a second exchange chip preset in the second video exchange card, and sending the video stream to be transmitted to a video display terminal connected with the second video exchange card to display the video stream to be transmitted.
In this embodiment, the step determines the video to be output by receiving the configuration instruction sent by the upper software configuration, and then sends the video to be output to the video display terminal connected to the second video switch card so as to display the video to be output, thereby completing remote transmission of the video, and simultaneously realizing that one video display terminal simultaneously displays a plurality of video pictures.
Further, in this embodiment, an optical fiber video seat multi-picture splicing retransmission system is also disclosed, and the specific structure of the system may refer to fig. 2, and the system mainly includes a code sending module 201, a receiving and converting module 202, a video exchanging module 203, a video splicing module 204 and a video transmitting module 205.
The code sending module 201 is configured to perform lossless and compression-free encoding on each of the acquired multiple paths of first video data, obtain multiple paths of second video data, and send the multiple paths of second video data through an optical fiber.
The receiving conversion module 202 is configured to receive the plurality of paths of second video data through a preset first video switch card, and perform high-speed signal conversion on each path of second video data in the plurality of paths of second video data, so as to obtain a plurality of paths of second high-speed video data.
The video exchange module 203 is configured to determine a second video exchange card according to a conversion configuration sent by an upper layer software configuration, forward the plurality of paths of second high-speed video data to the second video exchange card through the first video exchange card, and decode the plurality of paths of second high-speed video data through the second video exchange card to obtain a plurality of corresponding first video streams after video stream decoding is performed on each path of second high-speed video data in the plurality of paths of second high-speed video data.
The video stitching module 204 is configured to perform image stitching on the plurality of first video streams by using an image stitching recoding processing technology preset in the second video switch card, so as to obtain a second video stream.
The video transmission module 205 is configured to obtain, by using the second video switch card, an output configuration sent by the upper layer software configuration, determine, according to the output configuration, a video stream to be played from the second video stream and the plurality of first video streams, and transmit, by using the second video switch card, the video stream to be played.
In this embodiment, the code transmitting module 201 includes a buffer unit, a signal unit, and a coding unit.
The buffer unit is used for receiving the plurality of paths of first video data and buffering each path of first video data in the plurality of paths of first video data.
The signal unit is used for acquiring field synchronizing signals respectively corresponding to each path of first video data and generating control signals respectively corresponding to each path of first video data according to the field synchronizing signals; the control signals include a video frame start signal, a video frame end signal, and a video invalid data signal.
The encoding unit is used for respectively binary encoding each path of first video data in the plurality of paths of first video data to obtain encoded data respectively corresponding to each path of first video data; and combining the coded data and the control signals respectively corresponding to each path of first video data to obtain second video data respectively corresponding to each path of first video data.
In this embodiment, the receiving and converting module 202 includes a signal receiving unit and a signal converting unit.
The signal receiving unit is used for respectively receiving each path of second video data in the plurality of paths of second video data through an optical module preset in the first video exchange card, and respectively transmitting each path of second video data to the first exchange chip of the first video exchange card backboard through an FPGA chip preset in the first video exchange card.
The signal conversion unit is used for receiving each path of second video data through a first high-speed signal interface preset on the first exchange chip, and respectively carrying out high-speed signal conversion on each path of second video data to obtain a plurality of paths of second high-speed video data corresponding to the plurality of paths of second video data.
In the method and system for multi-picture splicing and retransmission of an optical fiber video agent disclosed in this embodiment, firstly, lossless non-compression encoding is performed on each path of first video data in a plurality of paths of acquired first video data, so as to ensure that the video is not damaged in the transmission process, ensure that the image quality of the video is consistent with that of a source video when displayed, then after encoding the video signal, the video signal is transmitted through an optical fiber, so that the transmission delay can be reduced, the video transmission speed is improved, after transmitting the multi-path video data, a preset first video exchange card is utilized to receive the plurality of paths of first video data, and convert each path of first video data in the plurality of paths of first video data into high-speed video data, so as to improve the video transmission speed, after the first video exchange card receives the high-speed video signal, a second video exchange card is determined, and forwarding the received high-speed video data to the second video exchange card, so that the video data is decoded by the second video exchange card, the corresponding video stream is output, the plurality of video streams are spliced by a preset image splicing recoding processing technology to obtain a second video stream spliced by the plurality of video streams, and the first video stream and the second video stream are respectively displayed according to the output configuration of the second video exchange device. The simultaneous display of multiple paths of videos is realized.
Example two
In this embodiment, another optical fiber video agent multi-picture stitching retransmission method is provided, and referring to fig. 3, the specific implementation flow of the retransmission method mainly includes steps 301 to 305, and the steps mainly include:
step 301: and respectively carrying out lossless compression-free encoding on the received first video data through a plurality of preset video sending boxes, and sending the encoded first video data to a first video exchange card in video exchange processing equipment.
In this embodiment, this step is mainly: and respectively carrying out lossless compression-free encoding on each path of first video data in the acquired paths of first video data to obtain a plurality of paths of second video data, and transmitting the paths of second video data through optical fibers.
The further step may specifically be that after the video sending box device is powered on, an FPGA (field programmable gate array) chip pre-stored in the video sending box device is utilized to load an FPGA program from a flash memory chip, after the FPGA chip program is started, first video data input by an HDMI interface connected with the video sending box device is received, the first video data may be 1920x1080x60hz video data, the video data is buffered in a FIFO and waiting for encoding, each video sending box device receives one path of video data sent by a corresponding connected HDMI interface, further, referring to fig. 4, a functional module structure diagram of the sending box device provided by the embodiment of the present invention may be provided, as shown in fig. 4, the sending box device is connected with the first power interface through a first power module to supply power, powered on through the first power switch, then the sending box device receives the video data sent by the first HDMI interface connected with the first power switch through a video receiving module, performs lossless encoding on the video data through a preset video lossless encoding module, and then sends the encoded video data to the first optical module after the serial transmission module is exchanged.
The video lossless coding module may further perform coding to obtain a field synchronization signal of the first video data so as to generate a corresponding control signal according to the field synchronization signal, and optionally, in this embodiment, the generation control signal may specifically be a control signal corresponding to the first video data generated by using a control signal 0x1 of 4 bits as non-video data, wherein the VSYNC (field synchronization signal) of the first video data starts with a frame represented by 0x5a0000BC, the VSYNC (field synchronization signal) starts with a frame represented by 0x5a0001BC, and the FIFO is a null data represented by 0x5a0002BC, and the control signal corresponding to the first video data is generated by using the above technical means.
And when the video data exists in the FIFO buffer memory, directly taking the original data of which the FIFO data form 32 bits as encoded data (without compression encoding), namely binary encoding is carried out on the buffered first video data, simultaneously, a control signal 0x0 of 4 bits is used for representing the buffered first video data as the video data, finally, the 32bit encoded data and the control signal of 4 bits form the encoded first video data at the same time, and further, optionally, a high-speed transceiver of the FPGA is utilized for receiving the encoded first video data, and the high-speed transceiver can convert the parallel data into serial data of 12.5Gb/s and send the serial data into an optical module of a first video exchange card in video exchange processing equipment.
Step 302: the first video data after coding is received through the optical module of the first video exchange card, the first video data after coding is sent to the exchange chip connected with the first video exchange card in a back mode, the second video exchange card is determined according to upper software configuration, and the first video data after coding is sent to the second video exchange card through the exchange chip.
In this embodiment, the steps mainly include: receiving the plurality of paths of second video data through a preset first video exchange card, and performing high-speed signal conversion on each path of second video data in the plurality of paths of second video data to obtain a plurality of paths of second high-speed video data; and determining the second video exchange card according to the conversion configuration sent by the upper software configuration.
Specifically, referring to fig. 5, a schematic structural diagram of a functional module of a video switch card provided by the embodiment of the invention is provided, and the video switch card specifically includes an optical module, an FPGA chip, a video recoding module, a video splicing processing and video decoding module, a high-speed serial data receiving and transmitting interface, and a back board high-speed serial receiving and transmitting interface, as shown in fig. 5, a front panel of the video switch card provided by the embodiment is connected with four optical modules, each optical module can be connected with a video transmitting box or a receiving box, a back panel is simultaneously provided with four paths of 12.5Gb high-speed signal connection switch chips, as shown in fig. 5, after a first video switch card is inserted into a video switch processing device, a power supply is activated, an FPGA (field programmable gate array) chip on the first video switch card loads an FPGA program from a flash memory chip, and after the FPGA chip program is started, four paths of optical module data are received, then the four-way optical module receives data and transmits the data to the first exchange chip of the backboard, the first exchange chip transmits the received first video exchange card data to the back high-speed interface of any video exchange card through the upper software configuration to realize video full-exchange switching, and the second video exchange card which is confirmed to be transmitted according to the upper software configuration forwards the data to the second video exchange card, specifically, each device (a sending box, a receiving box and an exchange card) is provided with a flash chip for storing FPGA programs, the four-way optical module data is the video data which is connected with four sending boxes through four optical fibers, the four sending boxes are connected through four optical fiber lines to obtain the data, meanwhile, the exchange chip which is connected with the back of the video exchange card comprises a high-speed interface which is a high-speed serial transceiver carried by the FPGA, the transmission rate is 12.5Gb/s.
Step 303: the second video exchange card receives the encoded first video data, performs video decoding on the encoded first video data to obtain a plurality of paths of first video streams, and splits the plurality of paths of first video streams to obtain corresponding second video streams after splitting the plurality of paths of first video streams.
In this embodiment, this step is mainly: the second video exchange card is used for decoding video streams of the plurality of paths of second high-speed video data, so that a plurality of first video streams corresponding to each path of second high-speed video data in the plurality of paths of second high-speed video data after video stream decoding are respectively carried out; and performing image splicing on the plurality of first video streams through an image splicing recoding processing technology preset in the second video exchange card to obtain second video streams.
Specifically, in this embodiment, in this step, the second video switch card receives four paths of high-speed serial signals back to the switch chip, converts the four paths of high-speed serial signals into four paths of parallel data through the FPGA self-contained high-speed transceiver, and defines the four paths of parallel data as a code stream 1, a code stream 2, a code stream 3, and a code stream 4, where each path of parallel code stream can decode one path of video data, and further, the specific decoding process of the code stream is that when the data is 32bit 0x5a0000BC and the control signal of 4bit is 0x1, the falling edge of VSYNC (field synchronization signal) is represented, and the falling edge of VSYNC (field synchronization signal) is also represented by the start identifier of a frame; when the data is 0x5A0001BC with 32 bits and the control signal with 4 bits is 0x1, the rising edge of VSYNC (field synchronous signal) is represented, and the end mark of a frame is also represented; when the data is 0x5A0002BC of 32 bits and the control signal of 4 bits is 0x1, the data represents invalid null data; when the control signal of 4 bits is 0x0 time and the parallel 32bit data is video data, the video data is written into DDR, through the four paths of decoding processing, DDR is adopted to buffer four paths of video data and the four paths of video data are respectively represented by video 1, video 2, video 3 and video 4, in the embodiment, each path of high-speed serial signal has independent frame start identification, end identification, invalid null data and valid video data, and each switching card FPGA is connected with a switching chip in a back-to-back mode through four paths of high-speed serial signals, so that four paths of video data are shared.
Further, in this embodiment, a vertical synchronization pulse signal VSYNC with a frequency of 60Hz is self-generated inside the FPGA chip included in the second video switch card, and a horizontal counter cnt_x and a vertical counter cnt_y are preset at the same time, in this embodiment, the horizontal counter and the vertical counter are updated according to the vertical synchronization pulse signal, that is, 0x5a0001BC encoded with 32 bits when the rising edge of the VSYNC arrives, 0x5a0000BC encoded with 32 bits when the falling edge of the VSYNC arrives, and the control signal is set to 0x1, and cnt_x is continuously counted in a step-by-step manner when the VSYNC is at a logic low level, cnt_x is reset to 1 and cnt_y is added with 1 when cnt_x is equal to 3840, and cnt_y is equal to 2160, and the value of the horizontal counter is counted up by the above change according to the vertical synchronization pulse signal.
Further, each first video stream of the plurality of first video streams is sequentially read according to the horizontal counter value and the vertical counter value, when cnt_x is 1920 or less and cnt_y is 1080 or less, 32bit video 1 data is read from the DDR as encoding parallel data, and a control signal is set to 0x0; reading 32bit video 2 data from the DDR as encoding parallel data when cnt_x is greater than 1920 and cnt_y is less than or equal to 1080 and setting a control signal to 0x0; reading 32bit video 3 data from the DDR as encoding parallel data when cnt_x is 1920 or less and cnt_y is 1080 or more and setting a control signal to 0x0; when cnt_x is greater than 1920 and cnt_y is greater than 1080, the 32bit video 4 data is read from the DDR as encoded parallel data and the control signal is set to 0x0, so as to sum up, each first video stream corresponds to different horizontal counter value and vertical counter value.
Two-dimensional coordinate maps (1, 1) to (3840,2160) are generated according to cnt_x and cnt_y values, four paths 1920x1080 of images are spliced into an image coding data stream 3840x2160 according to the two-dimensional coordinate maps and different horizontal counter values and vertical counter values corresponding to each first video stream respectively, and the image coding data stream is defined as a code stream 5, namely the second video stream.
Step 304: and determining a video stream to be transmitted through the upper software configuration, and transmitting the video stream to be transmitted through the second video exchange card.
In this embodiment, this step is mainly: and acquiring an output configuration sent by the upper software configuration through the second video exchange card, determining a video stream to be played from the second video stream and the plurality of first video streams according to the output configuration, and transmitting the video stream to be played through the second video exchange card.
Further, in this embodiment, this step is specifically: referring to fig. 5, the second video switch card panel has four optical modules, each optical module may select any one of the code stream 1, the code stream 2, the code stream 3, the code stream 4, and the code stream 5 according to configuration, where the code stream 1, the code stream 2, the code stream 3, and the code stream 4 are four independent video code streams received from the back panel, and the code stream 5 is a four-in-one recoded video code stream); after the code stream is selected, parallel data are converted into serial data of 12.5Gb/s through a high-speed transceiver of the FPGA, and the serial data are transmitted to respective optical module interfaces, and further, the FPGA controls the optical module to transmit four registers reg1, reg2, reg3 and reg4 configured through SPI to respectively represent the transmission selection of the four optical modules, if the configuration value of reg1 is 1, the optical module 1 selects to transmit the code stream 1 data, and if the configuration value of reg1 is 5, the optical module 1 selects to transmit the code stream 5 data. The code stream is sent to the video receiving box.
Further, after the second video switch card sends the code stream according to the configuration, as shown in fig. 6, after the receiving box device is powered on, an FPGA (field programmable gate array) chip loads an FPGA program from a flash memory chip, the receiving boxes are connected with the video switch card through optical fiber lines, and each receiving box occupies an optical module interface on the video switch card. The FPGA of the receiving box receives the data of the optical module, the high-speed serial data of the optical module is converted into parallel data through the FPGA with a high-speed transceiver, and when the parallel data is 0x5A0000BC with 32 bits and the control signal is 0x1 to represent the frame start of the video stream, a VSYNC signal is output to be at a low level; when the parallel data is 0x5A0001BC with 32 bits and the control signal is 0x1 to represent the end of the frame of the video stream, outputting a VSYNC signal with high level, wherein the VSYNC is a field synchronous signal of a video output interface, the high-low level conversion is a condition of generating a rising edge and a falling edge, the high level is changed into the low level to represent the beginning of a frame, the low level is changed into the high level to represent the end of the frame, and when the parallel data is 0x5A00002BC with 32 bits and the control signal is 0x1 to represent invalid data, the data can be discarded; when the control signal is 0x0, representing the video valid signal, the corresponding 32bit coded data is output to the HDMI interface as parallel video data to be displayed on a display. If the code stream of the video exchange card optical module connected with the receiving box optical module is the code stream 1 or the code stream 2 or the code stream 3 or the code stream 4, the display displays a video stream picture corresponding to a single channel; if the code stream of the video exchange card optical module connected with the receiving box optical module is the code stream 5, the video picture displayed by the display is a four-in-one picture obtained by integrating the video 1, the video 2, the video 3 and the video 4.
Specifically, referring to the method for multi-picture splicing and retransmission of an optical fiber video seat disclosed in the steps 301 to 304, when four sending boxes in the system are respectively a sending box 1, a sending box 2, a sending box 3, a sending box 4, and videos accessed by the four sending boxes are video 1, video 2, video 3 and video 4; two video exchange cards in the system are respectively a video exchange card 1 and a video exchange card 2; the system has four receiving boxes, namely a receiving box 1, a receiving box 2, a receiving box 3 and a receiving box 4. The four sending boxes are respectively connected with the four optical modules on the video exchange card 1 through the optical modules, and the four receiving boxes are respectively connected with the four optical modules on the video exchange card 2 through the optical modules. After the configuration exchange chip connects and breaks up four paths of high-speed signals connected back by the exchange card 2 and four paths of high-speed signals connected back by the exchange card 1, the exchange card 2 obtains four paths of independent code streams which are respectively a code stream 1, a code stream 2, a code stream 3 and a code stream 4, and another code stream 5 is generated after four paths of splicing and recoding processing. When the output of the four optical modules of the switch card 2 is respectively configured into a code stream 1, a code stream 2, a code stream 3 and a code stream 4, the four receiving boxes respectively display pictures of a video 1, a video 2, a video 3 and a video 4; when the output of the four optical modules of the switch card 2 is respectively configured as a code stream 5, a code stream 2, a code stream 3 and a code stream 4, the four receiving boxes respectively display four-in-one pictures of the video and pictures of the video 2, the video 3 and the video 4.
According to the multi-picture splicing retransmission method for the optical fiber video seat, an FPGA (field programmable gate array) chip in a sending box receives an input video signal and carries out lossless compression-free coding, coded data is sent to an optical module through a 12.5Gb high-speed transceiver of the FPGA chip, a plurality of video exchange cards are arranged in video exchange processing equipment, four optical modules are arranged on a front panel of each video exchange card, four paths of high-speed signals are connected with an exchange chip simultaneously, and the exchange chip is used for communication between the exchange cards. Each exchange card is provided with an FPGA chip which can be connected with four sending/receiving boxes at most through optical fiber wires, the exchange card receives optical fiber data transmitted by the sending boxes and forwards the data to the back-connected exchange chip, meanwhile, the exchange card also receives four paths of high-speed data transmitted by the back-connected exchange chip, the four paths of data are decoded into four paths of video data and then are subjected to image splicing, the spliced data are recoded into 12.5Gb high-speed transceiver data, and the exchange card can select input signals of the transparent exchange chip or select optical modules of the video splicing and send the data to a panel according to configuration. The receiving box is also provided with an FPGA chip which is connected with the exchange card through the optical fiber and receives high-speed data of the receiving box, the data are decoded into video data and then output to the display for display, and further, the embodiment of the invention uses the optical module and the optical fiber line in a video transmission medium, the video data are not subjected to lossy compression in the transmission process, the transmission delay is low, and the display image quality of the terminal is ensured to be consistent with that of a source video; meanwhile, the network packet protocol is not used during transmission, but a self-defined private protocol is used, a network switch in the market is not required, the privacy and the safety of the transmission process are guaranteed, and the video exchange processing card can split and process the four-way sending box video signals and then recode and send the four-way sending box video signals to the receiving box, so that one receiving box can display pictures of the four-way sending box at the same time.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The multi-picture splicing retransmission method for the optical fiber video seat is characterized by comprising the following steps of:
respectively carrying out lossless compression-free encoding on each path of first video data in the acquired paths of first video data to obtain a plurality of paths of second video data, and transmitting the paths of second video data through optical fibers;
receiving the plurality of paths of second video data through a preset first video exchange card, and performing high-speed signal conversion on each path of second video data in the plurality of paths of second video data to obtain a plurality of paths of second high-speed video data;
determining a second video exchange card according to a conversion configuration sent by an upper software configuration, forwarding the plurality of paths of second high-speed video data to the second video exchange card through the first video exchange card, and decoding video streams of the plurality of paths of second high-speed video data through the second video exchange card to obtain a plurality of corresponding first video streams after video stream decoding of each path of second high-speed video data in the plurality of paths of second high-speed video data;
Performing image splicing on the plurality of first video streams through an image splicing recoding processing technology preset in the second video exchange card to obtain second video streams;
and acquiring an output configuration sent by the upper software configuration through the second video exchange card, determining a video stream to be played from the second video stream and the plurality of first video streams according to the output configuration, and transmitting the video stream to be played through the second video exchange card.
2. The method for multi-picture splicing and retransmitting of an optical fiber video agent according to claim 1, wherein the lossless non-compression encoding is performed on each of the acquired first video data, respectively, comprising:
receiving the plurality of paths of first video data, and caching each path of first video data in the plurality of paths of first video data;
acquiring field synchronizing signals respectively corresponding to each path of first video data, and generating control signals respectively corresponding to each path of first video data according to the field synchronizing signals; the control signals comprise a video frame start signal, a video frame end signal and a video invalid data signal;
Binary coding is respectively carried out on each path of first video data in the plurality of paths of first video data, and coding data respectively corresponding to each path of first video data is obtained;
and combining the coded data and the control signals respectively corresponding to each path of first video data to obtain second video data respectively corresponding to each path of first video data.
3. The method for multi-picture stitching and retransmission of an optical fiber video agent according to claim 1, wherein the steps of receiving the plurality of paths of second video data through a preset first video switch card, and performing high-speed signal conversion on each path of second video data in the plurality of paths of second video data include:
receiving each path of second video data in the plurality of paths of second video data through an optical module preset in the first video exchange card respectively, and transmitting each path of second video data to a first exchange chip of a backboard of the first video exchange card through an FPGA chip preset in the first video exchange card respectively;
and receiving each path of second video data through a first high-speed signal interface preset on the first exchange chip, and respectively performing high-speed signal conversion on each path of second video data to obtain a plurality of paths of second high-speed video data corresponding to the plurality of paths of second video data.
4. A method for multi-picture stitching retransmission of an optical fiber video agent as claimed in claim 3 wherein said determining a second video switch card based on a switch configuration sent by an upper layer software configuration, forwarding said plurality of paths of second high-speed video data to said second video switch card via said first video switch card, comprises:
receiving conversion configuration sent by the upper layer software configuration through the first exchange chip, and determining the second video exchange card according to the conversion configuration;
and forwarding each path of second high-speed video data in the paths of second high-speed video data to a second switching chip connected back to the second video switching card through the first switching chip.
5. The method for split-frame retransmission of an optical fiber video agent according to claim 4, wherein said decoding the video stream of the plurality of paths of second high-speed video data by the second video switch card comprises:
receiving a plurality of paths of second high-speed video data sent by the first exchange chip through a second high-speed interface preset in the second exchange chip, and quasi-converting serial data included in the plurality of paths of second high-speed video data into parallel data to obtain a plurality of paths of second high-speed video parallel data corresponding to the plurality of paths of second high-speed video data;
And acquiring control signals respectively corresponding to each path of second high-speed video parallel data in the paths of second high-speed video parallel data, and performing video decoding on the path of currently corresponding second high-speed video parallel data according to the control signals to acquire first video streams respectively corresponding to each path of second high-speed video parallel data.
6. The method for multi-picture splicing and re-transmitting an optical fiber video agent according to claim 1, wherein said performing image splicing on said plurality of first video streams by means of an image splicing re-encoding processing technique preset in said second video switch card comprises:
continuously generating a vertical synchronization pulse signal according to fixed frequency through an FPGA chip preset on the second video exchange card, and updating a preset horizontal counter value and a preset vertical counter value according to the vertical synchronization pulse signal;
sequentially reading each first video stream in the plurality of first video streams according to the horizontal counter value and the vertical counter value, and determining two-dimensional coordinates corresponding to each first video stream according to the horizontal counter value and the vertical counter value corresponding to each first video stream respectively;
And splicing the first video streams according to the two-dimensional coordinates corresponding to each first video stream respectively to obtain second video streams obtained after the first video streams are spliced.
7. The method for multi-picture stitching retransmission of an optical fiber video agent according to claim 1, wherein said determining a video stream to be played from said second video stream and said plurality of first video streams according to said output configuration comprises:
receiving output configuration sent by the upper layer software configuration through an optical module preset in the second video exchange card, and determining a video stream to be transmitted from the second video stream and the plurality of first video streams according to the output configuration;
and receiving the video stream to be transmitted through a second exchange chip preset in the second video exchange card, and sending the video stream to be transmitted to a video display terminal connected with the second video exchange card to display the video stream to be transmitted.
8. The multi-picture splicing retransmission system of the optical fiber video seat is characterized by comprising a code sending module, a receiving and converting module, a video exchange module, a video splicing module and a video transmission module;
The coding and transmitting module is used for respectively carrying out lossless and compression-free coding on each path of first video data in the acquired paths of first video data to acquire the paths of second video data, and transmitting the paths of second video data through optical fibers;
the receiving conversion module is used for receiving the plurality of paths of second video data through a preset first video exchange card, and carrying out high-speed signal conversion on each path of second video data in the plurality of paths of second video data to obtain a plurality of paths of second high-speed video data;
the video exchange module is used for determining a second video exchange card according to conversion configuration sent by upper software configuration, forwarding the plurality of paths of second high-speed video data to the second video exchange card through the first video exchange card, and decoding video streams of the plurality of paths of second high-speed video data through the second video exchange card to obtain a plurality of corresponding first video streams after video stream decoding is respectively carried out on each path of second high-speed video data in the plurality of paths of second high-speed video data;
the video splicing module is used for carrying out image splicing on the plurality of first video streams through an image splicing recoding processing technology preset in the second video exchange card to obtain a second video stream;
The video transmission module is used for acquiring the output configuration sent by the upper software configuration through the second video exchange card, determining a video stream to be played from the second video stream and the plurality of first video streams according to the output configuration, and transmitting the video stream to be played through the second video exchange card.
9. The optical fiber video seat multi-picture splicing retransmission system according to claim 8, wherein the code transmitting module comprises a buffer unit, a signal unit and a coding unit;
the buffer unit is used for receiving the plurality of paths of first video data and buffering each path of first video data in the plurality of paths of first video data;
the signal unit is used for acquiring field synchronizing signals respectively corresponding to each path of first video data and generating control signals respectively corresponding to each path of first video data according to the field synchronizing signals; the control signals comprise a video frame start signal, a video frame end signal and a video invalid data signal;
the encoding unit is used for respectively binary encoding each path of first video data in the plurality of paths of first video data to obtain encoded data respectively corresponding to each path of first video data; and combining the coded data and the control signals respectively corresponding to each path of first video data to obtain second video data respectively corresponding to each path of first video data.
10. The optical fiber video seat multi-picture splicing retransmission system according to claim 8, wherein the receiving and converting module comprises a signal receiving unit and a signal converting unit;
the signal receiving unit is used for respectively receiving each path of second video data in the plurality of paths of second video data through an optical module preset in the first video exchange card, and respectively transmitting each path of second video data to a first exchange chip of the first video exchange card backboard through an FPGA chip preset in the first video exchange card;
the signal conversion unit is used for receiving each path of second video data through a first high-speed signal interface preset on the first exchange chip, and respectively carrying out high-speed signal conversion on each path of second video data to obtain a plurality of paths of second high-speed video data corresponding to the plurality of paths of second video data.
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