CN112788298A - Real-time video transmission equipment and transmission method thereof - Google Patents
Real-time video transmission equipment and transmission method thereof Download PDFInfo
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- CN112788298A CN112788298A CN202110058613.0A CN202110058613A CN112788298A CN 112788298 A CN112788298 A CN 112788298A CN 202110058613 A CN202110058613 A CN 202110058613A CN 112788298 A CN112788298 A CN 112788298A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 28
- 238000004891 communication Methods 0.000 claims abstract description 14
- 230000000007 visual effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
- H04N21/6437—Real-time Transport Protocol [RTP]
Abstract
The invention discloses real-time video transmission equipment and a transmission method thereof, and the real-time video transmission equipment comprises a video acquisition module, a video coding module, a transmission control protocol processing module, a communication network module, a video decoding module and a central processing unit, wherein the central processing unit is respectively and directly electrically connected with the video acquisition module, the video coding module, the transmission control protocol processing module, the communication network module and the video decoding module. The video acquisition submodule of the real-time video transmission equipment and the transmission method thereof has the main function of completing the conversion from analog video to digital video; the video coding submodule is used for coding the acquired original digital video to generate a communication-oriented video stream which meets a certain standard and is suitable for network transmission; the video network transmission control submodule provides real-time and steady network application of the coded video, correspondingly uses the receiving module as the inverse of the sending module, and finally is combined with the development of an embedded system to build a complete real-time video transmission system.
Description
Technical Field
The invention relates to the technical field of video transmission, in particular to real-time video transmission equipment and a transmission method thereof.
Background
The development of video technology and network communication technology has led to the increasingly widespread use of video streaming media. Real-time video transmission can realize simultaneous communication with multiple people, people can speak face to face, and the real-time video transmission can also be used for learning, training and meeting with contacts, but how to improve the delay caused by distance or environment and improve the fluency of real-time video transmission also becomes a problem. Generally, video transmission requires a user to select a transmission mode according to a distance, and optical fiber transmission is adopted for a long distance, but although the optical fiber transmission speed is high, signals during reception are not stable enough, and meanwhile, the signals are interfered by surrounding environment.
Disclosure of Invention
In view of the above problems, the present invention provides a real-time video transmission apparatus and a transmission method thereof to solve the problems set forth in the above background art. The method comprises the following specific steps: in order to achieve the purpose, the invention adopts the following technical scheme: a real-time video transmission device and a transmission method thereof comprise a video acquisition module, a video coding module, a transmission control protocol processing module, a communication network module, a video decoding module and a central processing unit, wherein the central processing unit is respectively and electrically and directly connected with the video acquisition module, the video coding module, the transmission control protocol processing module, the communication network module and the video decoding module, and the video acquisition module, the video coding module, the transmission control protocol processing module, the communication network module and the video decoding module are adjacent and electrically connected with each other. Preferably, the video acquisition module mainly comprises a video A/D, a video D/A, a logic generation unit, a video processing unit and a data memory. Preferably, the video a/D section converts analog video signals of various standards into digital video signals as input data to the video processing subunit. Preferably, the logic generation unit is selected from an FPGA or a CPLD to complete various synchronous logic controls. Preferably, the video coding module compresses the digital video signal into a data stream that meets certain visual quality requirements and meets certain standards. Preferably, the video coding module adopts scalable coding, wherein the scalable coding includes three modes of spatial scalability, temporal scalability, and quality scalability. Preferably, the video decoding module is connected with the video playing module, the video playing module is provided with a wireless digital interface, and the wireless digital interface adopts a non-compression wireless connection mode and can work in any one of a 4.9GHz-5.875GHz frequency band, a 20MHz channel and a 40MHz channel. A real-time video transmission method, comprising the steps of: 1) At a video sending end, sampling an analog video to obtain a digital video and carrying out video coding, or directly coding the input digital video to generate a network communication-oriented video code stream suitable for network transmission; 2) Estimating the available transmission bandwidth of the network according to the feedback information, and adaptively adjusting the encoding output rate of the encoder (including the adjustment of the information source code rate and the adjustment of the channel code rate) so that the video code stream can meet the limitation of the available bandwidth of the current network transmission; 3) At the receiving end, the received video stream is decoded, the video signal is reconstructed, the current network transmission parameters (such as the packet loss rate in transmission) are calculated, and the feedback control information is sent. The invention has the following beneficial effects: the video acquisition submodule of the real-time video transmission equipment and the transmission method thereof has the main function of completing the conversion from analog video to digital video; the video coding submodule is used for coding the acquired original digital video to generate a communication-oriented video stream which meets a certain standard and is suitable for network transmission; the video network transmission control submodule provides real-time and steady network application of the coded video, correspondingly uses the receiving module as the inverse of the sending module, and finally is combined with the development of an embedded system to build a complete real-time video transmission system.
Drawings
FIG. 1 is a schematic flow chart of the system of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained in the following combination. In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Referring to fig. 1, the real-time video transmission device and the transmission method thereof according to the present invention includes a video capture module, a video encoding module, a transmission control protocol processing module, a communication network module, a video decoding module and a central processing unit, wherein the central processing unit is electrically and directly connected to the video capture module, the video encoding module, the transmission control protocol processing module, the communication network module and the video decoding module, and the video capture module, the video encoding module, the transmission control protocol processing module, the communication network module and the video decoding module are electrically connected to each other; the video acquisition module mainly comprises a video A/D, a video D/A, a logic generation unit, a video processing unit and a data memory; the video A/D part converts various standard analog video signals into digital video signals as input data of the video processing subunit; the logic generation unit adopts FPGA or CPLD to complete various synchronous logic controls, ensures the real-time performance of acquisition, analyzes and processes video data, is the soul of the whole acquisition module, but the required computation amount is often large, and in order to ensure the real-time performance of video processing, video processing is often completed by adopting a video processing special chip, a high-speed DSP, the FPGA, the DSP and the like; and secondly, the video coding module compresses the digital video signal into a data stream which meets a certain visual quality requirement and meets a certain standard, and the video coding module compresses the digital video signal into a data stream which meets a certain visual quality requirement and meets a certain standard. In network communication applications of video streams, it is particularly emphasized that video streams generated by an encoder should be adaptive to random fluctuations in network transmission bandwidth. Scalable video encoders are commonly used to encode video signals. Scalable video coding can be done in the temporal, spatial or orthogonal transform domain, with the basic idea being to split the code stream into a base layer and an enhancement layer. The base layer code stream is transmitted, and comprises a video code rate and a motion vector of a video sequence, wherein the video code rate and the motion vector provide minimum quality level guarantee; the added layer is transmission-selective and can be arbitrarily truncated according to the transmission condition of the network. In an ideal situation, the quality of the video stream will improve as the received enhancement layer code stream increases; thirdly, the video streaming transmission is obviously different from the data transmission of the traditional TCP/IP network, and the main difference is that: conventional data transmission has no strict requirements on transmission delay and transmission jitter, but has strict error control and error retransmission mechanisms. The video stream requires real-time transmission, has high requirements on synchronization, is very sensitive to transmission delay and jitter, but can allow packet loss under certain conditions, namely can accept a certain degree of transmission error codes. And streaming media services need to satisfy broadcast and multicast applications while having the ability to adaptively adjust the transmission quality of video according to the real-time available transmission bandwidth of the network. A real-time video transmission method, comprising the steps of: 1) At a video sending end, sampling an analog video to obtain a digital video and carrying out video coding, or directly coding the input digital video to generate a network communication-oriented video code stream suitable for network transmission; 2) Estimating the available transmission bandwidth of the network according to the feedback information, and adaptively adjusting the encoding output rate of the encoder (including the adjustment of the information source code rate and the adjustment of the channel code rate) so that the video code stream can meet the limitation of the available bandwidth of the current network transmission; 3) At the receiving end, the received video stream is decoded, the video signal is reconstructed, the current network transmission parameters (such as the packet loss rate in transmission) are calculated, and the feedback control information is sent. The above are merely examples of the present invention, and common general knowledge of known specific structures and characteristics in the schemes is not described herein. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The utility model provides a real-time video transmission equipment, includes video acquisition module, video coding module, transmission control protocol processing module, communication network module, video decoding module and central processing unit, its characterized in that: the central processing unit is respectively and electrically and directly connected with the video acquisition module, the video coding module, the transmission control protocol processing module, the communication network module and the video decoding module, and the video acquisition module, the video coding module, the transmission control protocol processing module, the communication network module and the video decoding module are adjacent and electrically connected with each other.
2. A real-time video transmission apparatus according to claim 1, wherein: the video acquisition module mainly comprises a video A/D, a video D/A, a logic generation unit, a video processing unit and a data memory.
3. A real-time video transmission apparatus according to claim 2, characterized in that: the video A/D section converts analog video signals of various standards into digital video signals as input data to the video processing subunit.
4. A real-time video transmission apparatus according to claim 2, characterized in that: the logic generation unit adopts FPGA or CPLD to complete various synchronous logic controls.
5. A real-time video transmission apparatus according to claim 1, wherein: the video encoding module compresses the digital video signal into a data stream that meets certain visual quality requirements and that meets certain standards.
6. A real-time video transmission apparatus according to claim 1, wherein: the video coding module adopts scalable coding, wherein the scalable coding comprises three modes of spatial domain scalability, temporal domain scalability and quality scalability.
7. A real-time video transmission apparatus according to claim 1, wherein: the video decoding module is connected with the video playing module, the video playing module is provided with a wireless digital interface, and the wireless digital interface adopts a non-compression wireless connection mode and can work in any one of a 9GHz-875GHz frequency band and a 20MHz or 40MHz channel.
8. A real-time video transmission method, comprising the steps of: 1) At a video sending end, sampling an analog video to obtain a digital video and carrying out video coding, or directly coding the input digital video to generate a network communication-oriented video code stream suitable for network transmission; 2) Estimating the available transmission bandwidth of the network according to the feedback information, and adaptively adjusting the encoding output rate of the encoder (including the adjustment of the information source code rate and the adjustment of the channel code rate) so that the video code stream can meet the limitation of the available bandwidth of the current network transmission; 3) At the receiving end, the received video stream is decoded, the video signal is reconstructed, the current network transmission parameters (such as the packet loss rate in transmission) are calculated, and the feedback control information is sent.
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| CN202110058613.0A CN112788298A (en) | 2021-01-16 | 2021-01-16 | Real-time video transmission equipment and transmission method thereof |
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| CN202110058613.0A CN112788298A (en) | 2021-01-16 | 2021-01-16 | Real-time video transmission equipment and transmission method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114222169A (en) * | 2021-12-14 | 2022-03-22 | 咪咕互动娱乐有限公司 | Video stream transmission method and device and communication equipment |
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Application publication date: 20210511 |