CN108696720B - Video scheduling system and method suitable for satellite communication - Google Patents
Video scheduling system and method suitable for satellite communication Download PDFInfo
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- CN108696720B CN108696720B CN201810429259.6A CN201810429259A CN108696720B CN 108696720 B CN108696720 B CN 108696720B CN 201810429259 A CN201810429259 A CN 201810429259A CN 108696720 B CN108696720 B CN 108696720B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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- H—ELECTRICITY
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- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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- H—ELECTRICITY
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Abstract
The invention discloses a video scheduling system suitable for satellite communication.A video acquisition terminal acquires and encodes video signals, a main video stream after encoding is sent to a video preprocessing and forwarding module, and an auxiliary video stream is sent to a video scheduling terminal; the video scheduling terminal responds to user operation and generates a control instruction, and meanwhile, receives the video auxiliary stream and performs decoding playing on the video auxiliary stream; the video preprocessing and forwarding module receives the control instruction and the video main stream, preprocesses the video main stream confirmed to be the staring video, then sends the video main stream to the opposite terminal, receives the media data from the satellite channel and confirms the identity of the media data, and if the video main stream is confirmed to be the opposite terminal, preprocesses the media data and forwards the media data to the video playing terminal for decoding and playing. The invention is suitable for the two-way real-time communication of satellite videos, can realize the monitoring, scheduling and pushing of local multi-channel videos, and can well solve the problem of mutual switching and sending among the multi-channel videos.
Description
Technical Field
The application belongs to the technical field of video scheduling, and particularly relates to a video scheduling system and method suitable for satellite communication.
Background
With the improvement of the technical level of satellite communication, satellite communication is more and more widely applied to video communication in various industrial fields, in particular to news interview, military communication, geological exploration, earthquake relief, forest fire prevention and the like. However, the existing satellite video communication system can only send a single video source, the operation of replacing the video source is complicated, and the random switching of multiple paths of videos cannot be realized. If satellite communication of multiple paths of videos is carried out at the same time, more satellite communication equipment needs to be used, so that the use cost is increased, and a large amount of precious satellite channel resources are wasted. Video scheduling systems in other fields have various problems and are not suitable for satellite communication.
Patent publication No. CN 104639906 a, "a monitoring video pushing method", includes the following steps: each camera is connected with a video hard disk video recorder, the video hard disk video recorders are connected with a video pushing workstation, the video pushing workstation is connected with an RTMP server, and the Web server is connected with the code sending management end, the SQL database and the video pushing workstation through an Internet network. The method can automatically push the monitoring video in real time without a large-memory storage system, and each user accesses the monitoring video pushing system by utilizing the unique network identity of each user to watch the monitoring video at any time, so that the privacy of the user is prevented from being revealed. However, the method is complex to implement, needs multiple server devices, can only implement single-phase transmission of multiple paths of videos, cannot implement transmission of a single high-definition video and arbitrary switching of multiple paths of videos, and is not suitable for satellite communication.
In patent application CN 103533389A, "a method and system for video push", a server in the system receives a request from a terminal, and issues a terminal list and a video stream file list to the terminal; then the server receives video code stream file information and a target terminal identification from the terminal; and the server finds the target terminal according to the target terminal identification and directly sends the video code stream file information to the target terminal. The method can improve the efficiency of processing the connection, improve the throughput and enable users to obtain better video experience. However, the system is complex, a scheduling server is required, the video pushing process is complicated, and the essence of the method is to remotely control video downloading, so that real-time communication of videos cannot be realized.
Disclosure of Invention
The invention discloses a video scheduling system and method suitable for satellite communication, which are suitable for bidirectional real-time communication of satellite videos, can realize monitoring, scheduling and pushing of local multi-channel videos, and can well solve the problem of mutual switching and sending among the multi-channel videos.
The technical scheme is as follows: the invention discloses a video scheduling system suitable for satellite communication, which comprises a video scheduling terminal, a video preprocessing and forwarding module, a video playing terminal and a multi-channel video acquisition terminal, wherein the video scheduling terminal comprises a video scheduling module, a video preprocessing and forwarding module, a video playing terminal and a multi-channel video acquisition terminal, wherein the video scheduling module comprises a video scheduling module, a:
the video acquisition terminal acquires video signals, encodes the acquired video media data, transmits the encoded main video stream to a video preprocessing forwarding module connected with the main video stream, and transmits the encoded auxiliary video stream to a video scheduling terminal connected with the auxiliary video stream;
the video scheduling terminal responds to the operation that the user selects the staring video to be sent, generates a corresponding control instruction and sends the control instruction to the video preprocessing and forwarding module connected with the video scheduling terminal; receiving the video auxiliary streams sent by each video acquisition terminal and decoding and playing the video auxiliary streams so as to realize the real-time monitoring of the multi-channel video auxiliary streams;
the video preprocessing forwarding module is used for receiving a control instruction sent by the video scheduling terminal and a video main stream sent by the multi-channel video acquisition terminal, judging whether the received video main stream is the video main stream of the staring video or not according to the control instruction, preprocessing the video main stream confirmed to be the staring video, and then sending the video main stream to an opposite terminal through a satellite channel; receiving media data from a satellite channel, performing identity confirmation on the media data according to a communication parameter instruction received in a link establishment communication process, preprocessing the media data if the media data is confirmed to be an opposite-end video main stream, and forwarding the media data to a video playing terminal connected with the opposite-end video main stream;
and the video playing terminal receives the video main stream sent by the video preprocessing and forwarding module and decodes and plays the video main stream.
The invention also discloses a video scheduling method suitable for satellite communication, which realizes the two-way real-time communication of the satellite video through a first video scheduling system and a second video scheduling system, wherein the first video scheduling system and the second video scheduling system both have any one of the characteristics;
a first video acquisition terminal of a first video scheduling system acquires video signals, encodes the acquired video media data, transmits a main encoded video stream to a first video preprocessing forwarding module connected with the main encoded video stream, and transmits an auxiliary encoded video stream to a first video scheduling terminal connected with the main encoded video stream;
a first video scheduling terminal of a first video scheduling system responds to an operation selected by a user as a going star video to be sent, generates a corresponding control instruction and sends the control instruction to a first video preprocessing and forwarding module connected with the control instruction;
a first video preprocessing forwarding module of a first video scheduling system receives a control instruction sent by a first video scheduling terminal and video main streams sent by various paths of first video acquisition terminals, judges whether the received video main streams are the video main streams of the staring videos or not according to the control instruction, preprocesses the video main streams confirmed to be the staring videos, and then sends the video main streams to a second video scheduling system through a satellite channel; the first video preprocessing forwarding module receives media data through a satellite channel, performs identity confirmation on the received media data according to a communication parameter instruction received in a link establishing communication process, performs preprocessing on a video main stream confirmed as an opposite-end video, and then sends the preprocessed media data to a first video playing terminal connected with the first video playing terminal;
and a first video playing terminal of the first video scheduling system receives the opposite-end video main stream sent by the first video preprocessing and forwarding module connected with the first video playing terminal, and decodes and plays the opposite-end video main stream.
In the above video scheduling system or video scheduling method:
preferably, the video media data adopts UDP or TCP/IP data format, and the source address and the destination address in the video media data are used as the identification.
Preferably, the video media data is in a UDP data format, and a header of the UDP data includes a source address and a destination address; the control instruction information comprises a source address serving as a to-be-sent staring video and an opposite-end communication address serving as a to-be-sent staring video sending destination; the communication parameter instruction comprises a communication address of the opposite-end video in satellite communication and a communication address of an opposite-end video sending destination;
the video preprocessing forwarding module judges whether the video main stream sent by the video acquisition terminal is the video main stream of the staring video or not according to the source address of the staring video in the control instruction, and the preprocessing of the video main stream confirmed to be the staring video refers to the following modification of the header of the staring video main stream: modifying a source address into a communication address of the local machine in satellite communication, and modifying a target address into an opposite-end communication address in a control instruction;
the video preprocessing forwarding module confirms the identity of the media data received through the satellite channel according to the communication address in the communication parameter instruction, and the preprocessing of confirming as the opposite-end video main stream means that the header of the opposite-end video main stream is modified as follows: and modifying the source address into the address of a video preprocessing forwarding module in the system, and modifying the target address into the address of a video playing terminal in the system.
Preferably, the media data is encapsulated into a streaming media format based on a communication protocol.
As an optimal scheme, the video scheduling terminal marks the auxiliary video stream of the staring video, and the push state of the main video stream of the staring video is checked through a communication protocol between the preprocessing forwarding module and the video scheduling terminal.
As a preferred scheme, the video capture terminal includes a wired video capture terminal and a wireless video capture terminal, wherein: the wired video acquisition terminal is in wired connection with the video preprocessing and forwarding module and is provided with a video acquisition unit for acquiring video signals and an encoding unit for encoding the acquired video signals; and the wireless video acquisition terminal is in wireless connection with the video preprocessing and forwarding module and is provided with a video acquisition unit for acquiring video signals and an encoding unit for encoding the acquired video signals.
As a preferred scheme, the video acquisition unit is a high-definition camera with a digital HDMI high-definition signal output function; the video coding unit adopts H.265 high-efficiency video coding technology and is used for realizing the coding of a video high-definition main stream and an auxiliary stream.
As a preferred scheme, the video scheduling system further comprises a wireless transmission module, the wireless video acquisition terminal is wirelessly connected with the video preprocessing and forwarding module through the wireless transmission module, and the wireless transmission module and the wireless video acquisition terminal are based on a dynamic MESH self-organizing network.
As a preferred scheme, the system further comprises a video storage module, which is used for storing the main video stream sent by the video preprocessing and forwarding module.
As a preferred scheme, the video playing terminal has a function of supporting the decoding and playing of the video with the resolution of more than 720P.
It should be noted that the video (media data stream) referred to in the present invention includes audio and video.
The video scheduling system and method applicable to satellite communication disclosed by the invention have the following beneficial effects:
(1) the method can transmit the video mainstream to the opposite-end satellite station in real time and can watch the video mainstream transmitted by the opposite-end satellite station in real time. The method can be applied to real-time communication such as video conferences and the like.
(2) Based on the system, according to the actual needs of users, the media data are monitored, scheduled and pushed through the video source, and are pre-screened, so that the number of satellite channel devices is reduced, the use cost is reduced, the satellite channel resources are saved, and efficient real-time video communication is realized.
(3) The main and auxiliary shunting processing provided by the invention enables an operator to monitor the push states of the auxiliary video streams and the staring videos collected by the local video collection terminal in real time without monitoring through playback, so that delay does not exist; and the video scheduling terminal only receives the auxiliary stream video and does not process the main stream of the video, so that the data processing amount is reduced, and the requirements and investment cost on hardware equipment are reduced.
(4) The satellite communication station can simultaneously acquire 255 paths of videos including a plurality of paths of wired videos and a plurality of paths of wireless videos, a satellite operator can simultaneously monitor and control the states of the acquired videos, one of the paths of videos is selected as a last-satellite video for satellite communication, and the video switching time is short without delay. The wireless video acquisition terminal can be expanded to 16 paths, the wireless ad hoc network technology adopted by wireless transmission can be automatically switched, and the practical distance can reach 5 kilometers.
(5) The local video network and the satellite video channel network are mutually isolated, and mapping connection is carried out through the custom gateway, so that the satellite video channel is well protected and isolated.
(6) The video coding can adopt an H.265 high-definition coding mode, support 1080P (1Mbps bandwidth audio and video simultaneous transmission), and simultaneously code a video high-definition main stream and an auxiliary stream with smaller bandwidth occupation, so that the output network video can be transmitted with higher quality under the limited satellite bandwidth.
Drawings
FIG. 1 is a schematic diagram of a video stream of a video scheduling system according to an embodiment;
FIG. 2 is a schematic diagram of command information of a video scheduling system according to an embodiment;
FIG. 3 is a schematic diagram illustrating a video playback terminal according to an embodiment;
FIG. 4 is a video push flowchart of a video scheduling method according to an embodiment;
fig. 5 is a video receiving flow chart of a video scheduling method in an embodiment.
Detailed Description
The following describes the technical solution of the present invention in detail with reference to the accompanying drawings and specific embodiments.
The embodiment discloses a video scheduling system which comprises a video scheduling terminal (IP:192.168.1.100), a video preprocessing forwarding module (IP:192.168.1.2), a wireless transmission module (IP:192.168.1.101), a wired video acquisition terminal (IP:192.168.1.67) and a video playing terminal (IP:192.168.1.66), wherein the video scheduling system is matched with three wireless video acquisition terminals (IP: 192.168.1.167/168/169).
The video scheduling terminal is a device with a multi-channel video decoding and playing function, in the embodiment, a tablet computer of an Android or windows operating system is adopted, and video scheduling software is installed.
The installed video scheduling software is configured with the following program elements: the video auxiliary stream monitoring system comprises a video auxiliary stream monitoring unit, a video pushing and scheduling unit, a video acquisition terminal control unit and a state receiving and displaying unit so as to realize the functions of video auxiliary stream monitoring, control instruction sending, system state displaying and the like. The system state mainly comprises: the system comprises the working states of all modules and terminals in the system, a video pushing state, a wireless video acquisition connection state and the like.
Video auxiliary stream monitoring unit: specifically, a self-developed video decoding plug-in can be adopted to receive the video auxiliary streams sent by each video acquisition terminal and decode and play the video auxiliary streams so as to realize the real-time monitoring of the multi-channel video auxiliary streams. In the embodiment, the special video decoding plug-in based on H.265 occupies small space and requires less resources, and the plug-in has the functions of image sharpening, special object identification and the like (for example, face identification).
A video push scheduling unit: the method mainly responds to the operation of selecting the staring video to be sent by a user, generates a control instruction and sends the control instruction to a video preprocessing and forwarding module. The control command information here mainly includes: the IP address and the port number of the staring video, the destination address and the destination port number of the satellite communication video transmission and the like.
Video acquisition terminal control unit: the method is mainly used for setting parameters of the video acquisition terminal, such as video acquisition resolution, coding sending rate and the like.
A status receiving and displaying unit: and receiving and displaying the states of the video preprocessing and forwarding module and the video acquisition terminal (including a wired video acquisition terminal and a wireless video acquisition terminal).
In addition, the video scheduling terminal can also mark the video auxiliary stream selected as the staring video through the video push scheduling unit, and check the push state of the video main stream corresponding to the video auxiliary stream through a communication protocol between the preprocessing and forwarding module and the video scheduling terminal, wherein the video preprocessing and forwarding module reports the working state of the video auxiliary stream to the video scheduling terminal every 200 ms. There are many ways of marking, and in the embodiment, a text mark and an icon are placed at the upper end of the video. The characters comprise names (corresponding to IP addresses one to one) of acquisition terminals corresponding to videos and resolution; the identification includes a star pushing state and an object recognition state (in the embodiment, face recognition is performed, and the identification is lighted up after a target person is found). The video preprocessing and forwarding module is connected with the video scheduling terminal through a network communication interface thereof, and receives a control instruction (as shown in fig. 2). The video preprocessing and forwarding module is connected with the wireless transmission module through a network communication interface thereof, and receives media data of the wireless video acquisition terminal (as shown in fig. 1). The video preprocessing and forwarding module is connected with the wired video acquisition terminal through a network communication interface thereof, and receives media data of the wired video acquisition terminal (as shown in fig. 1).
The preprocessing functions mainly include identity confirmation of the received media data (confirmation of whether the IP address is legitimate, i.e., whether it is the correct address) and header modification of the confirmed media data. The received media data mainly comprises a local video which is collected by a local video collection terminal and is designated as a staring video and an opposite-end video which is received through a satellite channel. The received media data can be forwarded after being preprocessed, the preprocessed local video is forwarded to the opposite terminal, and the preprocessed opposite terminal video is forwarded to the local video playing terminal to be played.
The wireless transmission module is a device capable of performing wireless transmission with the wireless video acquisition terminal. The wireless transmission module and the wireless video acquisition terminal of the invention are based on the dynamic MESH self-organizing network, can dynamically establish the optimal route in a mobile state, and have the advantages of flexible networking, dynamic routing, no center, high reliability and the like.
As shown in fig. 3, the video playing terminal may adopt a device having a function of supporting video decoding and playing with a resolution of above 720P, and is configured to play the media data sent by the video preprocessing and forwarding module.
The wired video acquisition terminal is equipment with video acquisition, encoding and other functions and is connected to the video preprocessing and forwarding module through a network interface. The video acquisition adopts a high-definition camera, and can output digital HDMI high-definition signals.
The wireless video acquisition terminal is equipment with video acquisition, encoding and other functions and is connected to the video preprocessing module through wireless communication. The wireless acquisition terminal adopts high definition digital camera to carry out video acquisition, can expand to 16 ways according to the demand, and can carry out automatic switching, and practical distance can reach 5 kilometers.
In the embodiment, the wired video acquisition terminal and the wireless video acquisition terminal both adopt an H.265 high-efficiency video coding technology, and can simultaneously code a high-definition main video stream and an auxiliary stream with smaller bandwidth occupation, so that the output network video is transmitted with higher quality under the limited satellite bandwidth. Part of parameters in the video acquisition terminal can be set through a video acquisition terminal control unit, for example, video acquisition resolution, coding transmission rate and the like.
Based on the system, the invention is different from the video scheduling in the prior art in that the received video does not need to be stored, the processing and the forwarding are real-time, the transmission delay time is an important index of the invention, and the real-time video call can be carried out. In the prior art, the two inquired video schedules are in a video review or download form, and real-time communication cannot be realized. Of course, the video scheduling system of the present invention may also integrate video downloading, storing and reviewing functions, for example, locally collected videos and videos of the opposite communication terminal may be stored by connecting a network hard disk recorder (NVR) for video downloading, storing and playing back.
With reference to fig. 4 and 5, the method for using the video scheduling system for bidirectional real-time satellite video communication is as follows:
as shown in fig. 4, each video capture terminal (including a local wired video capture terminal and a local wireless video capture terminal) captures a video signal, encodes the captured video signal, sends a main encoded video stream to a video preprocessing and forwarding module, and sends an auxiliary encoded video stream to a local video scheduling terminal. The wired video acquisition terminal acquires local videos in real time and encodes the videos, wherein a high-definition main stream is transmitted to the video preprocessing and forwarding module through a network, and an auxiliary stream is transmitted to the video scheduling terminal through the network. The three wireless video acquisition terminals can simultaneously acquire videos in a certain range around and encode the videos, the high-definition main stream is transmitted to the video preprocessing forwarding module through the wireless transmission module, and the auxiliary stream is transmitted to the video scheduling terminal.
And the local video scheduling terminal receives the auxiliary stream data of each video in real time and can decode and monitor each video through video decoding software. In the embodiment, the initial staring video of the video scheduling system is set to be the video acquired by the cable video acquisition terminal, that is, the state of the device just started is set through scheduling software, and the staring video pushed by default is the video acquired by the cable video acquisition terminal, and of course, the staring video can be selected by an operator. The operator monitors the video states of all paths in real time through the video scheduling terminal, and if one path is selected from the video scheduling terminal to be used as a staring video for satellite communication, such as a wireless video (IP: 192.168.1.167), the video scheduling terminal generates a corresponding control instruction and then sends the control instruction to the local video preprocessing and forwarding module. At the moment, the video in the pushing state is displayed on the video scheduling terminal and is the video collected by the video (IP: 192.168.1.167) of the wireless collection terminal.
The local video preprocessing and forwarding module receives a control instruction sent by the local video scheduling terminal in real time, and judges whether the received media data is the target media data according to the IP address and the port number of the staring video, namely, the identity of the received media data is confirmed. When a plurality of devices perform networking communication with each other, the IP address and the port number of each device are unique, the media data herein adopts a standard network UDP format, and the header thereof includes: source IP address, source port number, destination IP address, destination port number. If the video preprocessing forwarding module judges that the data is the destination media data, modifying the header of the media data, wherein the source address and the source port number (the IP address and the port number of the local video acquisition terminal) are modified into the IP address and the port number (namely the local communication address) of a local machine (namely a local video scheduling system) in satellite communication; and modifying the target address and the target port number (the IP address and the port number of the local video preprocessing and forwarding module) into the IP address and the port number of the opposite terminal of the satellite communication (namely, the opposite terminal communication address). And the video preprocessing forwarding module sends the modified video main stream in the staring video media data to a satellite channel sending buffer area. It should be noted that "local" here is relative to the opposite end, in satellite communication, all satellite communication devices (i.e. video scheduling systems) have a unique local address in the satellite network, and are communication addresses between communication ends; and the address of each terminal or module in the video scheduling system is an internal address. It should be noted that the internal network and the communication network are two isolated networks, and a mapping gateway is customized by the video preprocessing forwarding module. The mapping relation between the internal address and the communication address is determined by the pushed control instruction, and only the audio and video data are exchanged between the internal address and the communication address.
As shown in fig. 5, the local video preprocessing and forwarding module also receives media data sent by the opposite terminal in real time, performs preprocessing after confirming the identity, and then forwards the media data to the local video playing terminal for playing the high-definition video. Specifically, the opposite end sends media data through a satellite channel, after the preprocessing forwarding module receives the media data, the preprocessing forwarding module performs identity verification on the media data according to communication parameters (an IP address and a port number) to judge whether the media data is video data from the opposite end, and then performs the following processing on a header of the confirmed media data: the source address and the source port number (the IP address and the port number of an opposite terminal) are modified into the IP address and the port number of a preprocessing forwarding module in the local machine, the destination address and the port number (the IP address and the port number of the local machine) are modified into the IP address and the port number of a video playing terminal of the local machine, and then the preprocessed media data are sent to the video playing terminal for playing. It should be noted that, in the link establishment communication process, the satellite device is adopted to send a communication parameter instruction to the video preprocessing and forwarding module, where the instruction includes information such as a communication address of a communication opposite-end satellite device and a communication address of a sending destination of the opposite-end satellite device.
And the local video playing terminal decodes the media data sent by the local video preprocessing and forwarding module and plays the media data in real time.
Similarly, the opposite-end video preprocessing and forwarding module also reads media data in satellite communication from the satellite channel receiving buffer area and sends the staring video selected by the opposite end to push. Since the satellite communication devices at two ends of the real-time communication adopt the video scheduling system, the processing modes at two ends are similar, and the details are not repeated here.
It should be noted that, the video playing terminal usually only plays the video sent by the opposite terminal, but when satellite communication is not performed, that is, there is no opposite terminal, and only one device is provided, because the video scheduling terminal watches the auxiliary stream, the definition is not high, and the video main stream can be pushed to the video playing terminal for watching.
By the streaming processing, the real-time auxiliary stream monitoring function is synchronous, delay does not exist, and monitoring by playback is not needed; and because the video scheduling terminal only receives the auxiliary stream video and does not process the main stream, the data processing amount is reduced, the requirement on hardware equipment is reduced, and the equipment cost is greatly reduced.
The data transmission mode adopted by the invention case is as follows: the invention can also adopt the technologies of optical fiber, WLAN, Bluetooth, microwave, ZigBee, LTE, 4G and the like to transmit audio and video data.
The data form adopted by the invention is UDP data, and the data header is used as the identifier, and the data form of the UDP data can also be adopted, such as TCP/IP. Of course, the media data may also be encapsulated into a streaming media format, for example, a communication protocol such as RTP, RTMP, etc. is adopted, so that the real-time performance and the fluency of the video communication can be better guaranteed.
According to the technical scheme, the invention provides the video scheduling system and the video scheduling method suitable for satellite communication, and the satellite channel resources are saved and high-efficiency video communication is realized by pre-screening the media data according to the actual needs of users. The invention adopts the full IP communication mode, has the characteristics of flexible deployment, simple arrangement, flexibility, reliability and the like, and is also beneficial to the integration of various transmission modes.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a video scheduling system suitable for satellite communication which characterized in that, includes video scheduling terminal, video preliminary treatment forwarding module, video broadcast terminal and multichannel video acquisition terminal, wherein:
the video acquisition terminal acquires video signals, encodes the acquired video media data, transmits the encoded main video stream to a video preprocessing forwarding module connected with the main video stream, and transmits the encoded auxiliary video stream to a video scheduling terminal connected with the auxiliary video stream;
the video scheduling terminal responds to the operation that the user selects the staring video to be sent, generates a corresponding control instruction and sends the control instruction to the video preprocessing and forwarding module connected with the video scheduling terminal; receiving the video auxiliary streams sent by each video acquisition terminal and decoding and playing the video auxiliary streams so as to realize the real-time monitoring of the multi-channel video auxiliary streams;
the video preprocessing forwarding module is used for receiving a control instruction sent by the video scheduling terminal and a video main stream sent by the multi-channel video acquisition terminal, judging whether the received video main stream is the video main stream of the staring video or not according to the control instruction, preprocessing the video main stream confirmed to be the staring video, and then sending the video main stream to an opposite terminal through a satellite channel; receiving media data from a satellite channel, performing identity confirmation on the media data according to a communication parameter instruction received in a link establishment communication process, preprocessing the media data if the media data is confirmed to be an opposite-end video main stream, and forwarding the media data to a video playing terminal connected with the opposite-end video main stream;
and the video playing terminal receives the video main stream sent by the video preprocessing and forwarding module and decodes and plays the video main stream.
2. The video scheduling system of claim 1 wherein the video media data is in UDP or TCP/IP data format with a source address and a destination address in the video media data as their identities.
3. The video scheduling system of claim 2 wherein the video media data is in a UDP data format, the UDP data header including a source address and a destination address; the control instruction information comprises a source address serving as a to-be-sent staring video and an opposite-end communication address serving as a to-be-sent staring video sending destination; the communication parameter instruction comprises a communication address of the opposite-end video in satellite communication and a communication address of an opposite-end video sending destination;
the video preprocessing forwarding module judges whether the video main stream sent by the video acquisition terminal is the video main stream of the staring video or not according to the source address of the staring video in the control instruction, and the preprocessing of the video main stream confirmed to be the staring video refers to the following modification of the header of the staring video main stream: modifying a source address into a communication address of the local machine in satellite communication, and modifying a target address into an opposite-end communication address in a control instruction;
the video preprocessing forwarding module confirms the identity of the media data received through the satellite channel according to the communication address in the communication parameter instruction, and the preprocessing of confirming as the opposite-end video main stream means that the header of the opposite-end video main stream is modified as follows: and modifying the source address into the address of a video preprocessing forwarding module in the system, and modifying the target address into the address of a video playing terminal in the system.
4. The video scheduling system of claim 1 wherein the media data is encapsulated into a streaming media format based on a communication protocol.
5. The video scheduling system of claim 1 wherein the video scheduling terminal marks the auxiliary video stream of the staring video and checks the push status of the main video stream of the staring video via a communication protocol between the pre-processing forwarding module and the video scheduling terminal.
6. The video scheduling system of claim 1 wherein the video capture terminals comprise wired video capture terminals and wireless video capture terminals, wherein:
the wired video acquisition terminal is in wired connection with the video preprocessing and forwarding module and is provided with a video acquisition unit for acquiring video signals and an encoding unit for encoding the acquired video signals;
and the wireless video acquisition terminal is in wireless connection with the video preprocessing and forwarding module and is provided with a video acquisition unit for acquiring video signals and an encoding unit for encoding the acquired video signals.
7. The video scheduling system of claim 6 wherein the video capture unit is a high definition camera with digital HDMI high definition signal output; the video coding unit adopts H.265 high-efficiency video coding technology and is used for realizing the coding of a video high-definition main stream and an auxiliary stream.
8. The video scheduling system of claim 6 wherein the video scheduling system further comprises a wireless transmission module, the wireless video capture terminal is wirelessly connected to the video pre-processing forwarding module via the wireless transmission module, and the wireless transmission module and the wireless video capture terminal are based on a dynamic MESH ad hoc network.
9. The video scheduling system of claim 1 further comprising a video storage module for storing the video main stream transmitted by the video pre-processing forwarding module.
10. A video scheduling method suitable for satellite communication, which realizes bidirectional real-time communication of satellite videos through a first video scheduling system and a second video scheduling system, wherein the first video scheduling system and the second video scheduling system have the characteristics of any one of claims 1 to 9;
a first video acquisition terminal of a first video scheduling system acquires video signals, encodes the acquired video media data, transmits a main encoded video stream to a first video preprocessing forwarding module connected with the main encoded video stream, and transmits an auxiliary encoded video stream to a first video scheduling terminal connected with the main encoded video stream;
a first video scheduling terminal of a first video scheduling system responds to an operation selected by a user as a going star video to be sent, generates a corresponding control instruction and sends the control instruction to a first video preprocessing and forwarding module connected with the control instruction;
a first video preprocessing forwarding module of a first video scheduling system receives a control instruction sent by a first video scheduling terminal and video main streams sent by various paths of first video acquisition terminals, judges whether the received video main streams are the video main streams of the staring videos or not according to the control instruction, preprocesses the video main streams confirmed to be the staring videos, and then sends the video main streams to a second video scheduling system through a satellite channel; the first video preprocessing forwarding module receives media data through a satellite channel, performs identity confirmation on the received media data according to a communication parameter instruction received in a link establishing communication process, performs preprocessing on a video main stream confirmed as an opposite-end video, and then sends the preprocessed media data to a first video playing terminal connected with the first video playing terminal;
and a first video playing terminal of the first video scheduling system receives the opposite-end video main stream sent by the first video preprocessing and forwarding module connected with the first video playing terminal, and decodes and plays the opposite-end video main stream.
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| CN112104918A (en) * | 2020-11-04 | 2020-12-18 | 捷信（浙江）通信技术有限公司 | Image transmission method and device based on satellite network |
| CN113596377A (en) * | 2021-08-02 | 2021-11-02 | 北京数码视讯技术有限公司 | Monitoring video conversion device and system for satellite communication |
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