CN113411646A - Cloud rebroadcasting code rate adjusting method and device, readable storage medium and cloud rebroadcasting system - Google Patents
Cloud rebroadcasting code rate adjusting method and device, readable storage medium and cloud rebroadcasting system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
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- H04N21/21—Server components or server architectures
- H04N21/218—Source of audio or video content, e.g. local disk arrays
- H04N21/21805—Source of audio or video content, e.g. local disk arrays enabling multiple viewpoints, e.g. using a plurality of cameras
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- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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- 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
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- 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
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
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- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
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Abstract
The invention discloses a method and a device for adjusting cloud rebroadcasting code rate, a readable storage medium and a cloud rebroadcasting system. The cloud rebroadcasting code rate adjusting method comprises the steps of obtaining a front-end network state of a video encoder side through a stream pushing condition based on the video encoder, and sending a code rate control signal to the video encoder according to the front-end network state and a preset adjusting strategy so as to enable the code rate of a high-code-stream video signal and the code rate of a low-code-stream video signal to be adaptive to the current network state, so that a stream pushing code stream can adapt to the front-end network state when the front-end network fluctuates, frame loss of the stream pushing is prevented, the stream pushing stability is improved, the video playing quality is improved, and the watching experience of a user is improved.
Description
This application is based on the application number: 202110431535.4 filed on, and claiming priority from, the chinese patent application having a filing date of 2021, 21/04, which is hereby incorporated by reference in its entirety.
Technical Field
The invention relates to the technical field of cloud rebroadcasting, in particular to a method and a device for adjusting a cloud rebroadcasting code rate, a readable storage medium and a cloud rebroadcasting system.
Background
In the traditional relay broadcasting, a plurality of machine positions are required to be erected on site, signals of the machine positions are transmitted to a relay broadcasting vehicle through an SDI (serial digital interface) physical line, and the direction broadcasting switching of the signals of the machine positions is carried out in the relay broadcasting vehicle. But the cloud relay technology is a current development trend due to the factors of limited use scenes, complex field wiring and the like of the traditional relay vehicle. In the cloud rebroadcasting process, the video signals collected by the multiple machine positions are encoded by the encoder and then transmitted to the cloud rebroadcasting server through the network. Generally, the encoder performs stream pushing with a fixed code rate. However, when the front-end network fluctuates, under the condition that the plug flow code rate is fixed and unchanged, the situations of frame loss, blocking and the like occur, and the watching experience of the user is influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a method for adjusting a cloud rebroadcasting code rate.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the present invention is to provide a cloud rebroadcasting code rate adjustment apparatus.
The fourth purpose of the invention is to provide a cloud relay system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for adjusting a cloud relay broadcast code rate, where a cloud relay broadcast system includes a video encoder, a main cloud relay broadcast platform, a standby cloud relay broadcast platform, and a production end, where the video encoder is configured to send a high-code-stream video signal to the main cloud relay broadcast platform and the standby cloud relay broadcast platform, and send a low-code-stream video signal to the production end, and the method includes: acquiring a front-end network state of a video encoder side based on a stream pushing condition of the video encoder; and sending a code rate control signal to the video encoder according to the front-end network state and a preset regulation strategy so as to enable the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal to be adaptive to the current network state.
According to the cloud rebroadcasting code rate adjusting method provided by the embodiment of the invention, the front-end network state of the video encoder side is obtained based on the stream pushing condition of the video encoder, and the code rate control signal is sent to the video encoder according to the front-end network state and the preset adjusting strategy, so that the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal are adapted to the current network state, and therefore, when the front-end network fluctuates, the stream pushing code stream can adapt to the front-end network state, the frame loss of the stream pushing is prevented, the stream pushing stability is improved, the video playing quality is improved, and the watching experience of a user is improved.
According to an embodiment of the present invention, sending a rate control signal to a video encoder according to a front-end network status and a preset adjustment policy, includes: when the network quality corresponding to the front-end network state is reduced, a first code rate control signal is sent to the video encoder, so that the video encoder reduces the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal, and the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal are adapted to the network state.
According to an embodiment of the invention, when the code rate of the high-code-stream video signal is reduced to be less than the first preset code rate and the state of the front-end network is continuously reduced, a closing signal is sent to the standby cloud rebroadcasting platform, so that the standby cloud rebroadcasting platform is closed.
According to an embodiment of the present invention, sending a rate control signal to a video encoder according to a front-end network state and a preset adjustment policy, further includes: and when the network quality corresponding to the front-end network state returns, sending a second code rate control signal to the video encoder, so that the video encoder improves the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal.
According to an embodiment of the invention, the method further comprises: acquiring a first real-time state of a main cloud relay platform and a second real-time state of a standby cloud relay platform, and judging whether the main cloud relay platform and the standby cloud relay platform are abnormal or not according to the first real-time state and the second real-time state; when the main cloud rebroadcasting platform is abnormal, a switching signal is sent to the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform, so that the standby cloud rebroadcasting platform starts the main mode to work, and the main cloud rebroadcasting platform starts the standby mode to work.
According to one embodiment of the invention, the push stream condition of the video encoder includes a frame loss rate.
In order to achieve the above object, a second aspect of the present invention provides a computer-readable storage medium, on which a cloud rebroadcasting rate adjustment program is stored, and when executed by a processor, the cloud rebroadcasting rate adjustment program implements the cloud rebroadcasting rate adjustment method.
According to the computer-readable storage medium of the embodiment of the invention, by the cloud rebroadcasting code rate adjusting method, when the front-end network fluctuates, the plug flow code stream can adapt to the state of the front-end network, so that the frame loss of the plug flow is prevented, the stability of the plug flow is improved, the video playing quality is improved, and the watching experience of a user is improved.
In order to achieve the above object, a third embodiment of the present invention provides a cloud rebroadcasting code rate adjustment device, which includes a memory, a processor, and a cloud rebroadcasting code rate adjustment program stored in the memory and operable on the processor, and when the processor executes the cloud rebroadcasting code rate adjustment program, the cloud rebroadcasting code rate adjustment method is implemented.
According to the cloud rebroadcasting code rate adjusting device provided by the embodiment of the invention, through the cloud rebroadcasting code rate adjusting method, when the front-end network fluctuates, the stream-pushing code stream can adapt to the state of the front-end network, the frame loss of the stream-pushing is prevented, the stream-pushing stability is improved, the video playing quality is further improved, and the user watching experience is improved.
In order to achieve the above object, a fourth aspect of the present invention provides a cloud relay system, including the foregoing cloud relay code rate adjusting device; the cloud relaying system further includes: the system comprises a plurality of video encoders, a main cloud rebroadcasting platform, a standby cloud rebroadcasting platform and a manufacturing end, wherein each video encoder is used for receiving a video source signal and encoding the video source signal into a high-code-stream video signal and a low-code-stream video signal; the manufacturing end is used for receiving the multi-path low-code-stream video signals and conducting cutting based on the multi-path low-code-stream video signals to generate low-code-stream program signals; the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform are used for receiving a plurality of paths of high-code-stream video signals and generating corresponding high-code-stream program signals according to the low-code-stream program signals; one end of the cloud rebroadcasting code rate adjusting device is respectively connected with the plurality of video encoders, the other end of the cloud rebroadcasting code rate adjusting device is respectively connected with the main cloud rebroadcasting platform, the standby cloud rebroadcasting platform and the manufacturing end, the cloud rebroadcasting code rate adjusting device is used for acquiring the front-end network state of the video encoder side based on the stream pushing situation of the video encoders, and sending a code rate control signal to the video encoders according to the front-end network state and a preset adjusting strategy, so that the code rate of the high-code-stream video signals and the code rate of the low-code-stream video signals are adaptive to the current network state.
According to an embodiment of the present invention, when the network quality corresponding to the network state at the front end is degraded, the cloud relay bit rate adjustment device is specifically configured to send the first bit rate control signal to the video encoder, so that the video encoder reduces the bit rate of the high-bit-stream video signal and the bit rate of the low-bit-stream video signal, so that the bit rate of the high-bit-stream video signal and the bit rate of the low-bit-stream video signal are adapted to the network state.
According to an embodiment of the present invention, when the code rate of the high-code-stream video signal is decreased to be less than the first preset code rate and the front-end network status is continuously decreased, the cloud relay code rate adjustment device is specifically configured to send a shutdown signal to the standby cloud relay platform, so that the standby cloud relay platform is shutdown.
According to an embodiment of the present invention, when the network quality corresponding to the front-end network state returns, the cloud relay bitrate adjustment device is specifically configured to send the second bitrate control signal to the video encoder, so that the video encoder increases the bitrate of the high-stream video signal and the bitrate of the low-stream video signal.
According to an embodiment of the present invention, the cloud relay code rate adjustment device is further configured to obtain a first real-time state of the main cloud relay platform and a second real-time state of the standby cloud relay platform, determine whether the main cloud relay platform and the standby cloud relay platform are abnormal according to the first real-time state and the second real-time state, and send a switching signal to the main cloud relay platform and the standby cloud relay platform when the main cloud relay platform is abnormal, so that the standby cloud relay platform starts the main mode to operate, and the main cloud relay platform starts the standby mode to operate.
According to the cloud rebroadcasting system provided by the embodiment of the invention, the front-end network state of the video encoder side is obtained by the cloud rebroadcasting code rate adjusting device based on the stream pushing situation of the video encoder, and the code rate control signal is sent to the video encoder according to the front-end network state and the preset adjusting strategy, so that the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal are adapted to the current network state, and therefore, when the front-end network fluctuates, the stream pushing code stream can adapt to the front-end network state, the frame loss of the stream pushing is prevented, the stream pushing stability is improved, the video playing quality is further improved, and the user watching experience is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is an architecture diagram of a cloud relay system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for adjusting a cloud rebroadcasting code rate according to an embodiment of the present invention;
fig. 3 is an interaction diagram of a cloud relay system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As described in the background art, in the conventional cloud relay technology, a video encoder usually performs stream pushing transmission with a fixed bit rate, so that when a current-end network fluctuates, the stream pushing bit rate is not suitable for a state of the current-end network, data transmission packet loss and frame loss may occur, and the stability of stream pushing is not high, which causes the output video to be blocked and affects the viewing experience of a user. And the cloud relay system has strong dependence on the quality of a cloud network, a traditional cloud relay platform is usually deployed on a cloud, and when the state of a cloud server fluctuates, the cloud relay platform can be hung up, so that the video playing is influenced.
In order to solve the problems, the application provides a method and a device for adjusting a cloud rebroadcasting code rate, a readable storage medium and a cloud rebroadcasting system, which can adaptively adjust the code rate of a video encoder according to the condition of a front-end network, so that the code rate is adaptive to the condition of the network, the video playing quality is improved, the user watching experience is improved, a hot standby is formed between the standby cloud rebroadcasting platform and a main cloud rebroadcasting platform by deploying the standby cloud rebroadcasting platform, and the standby cloud rebroadcasting platform is started when the line is broken, so that the rebroadcasting is not interrupted, and the user watching experience is improved.
The following describes a method and an apparatus for adjusting a cloud rebroadcasting code rate, a computer-readable storage medium, and a cloud rebroadcasting system according to embodiments of the present invention with reference to the accompanying drawings.
In this application, referring to fig. 1, the cloud relay system includes a cloud relay code rate adjusting device 10, a plurality of video encoders 20, a main cloud relay platform 30, a standby cloud relay platform 40, and a production end 50. The front end of each video encoder 20 is connected with a corresponding image collector, and the image collectors are used for collecting video source signals of a live broadcast site and sending the video source signals to the corresponding video encoders 20. The video encoder 20 encodes the video source signal into a high-code-stream video signal and a low-code-stream video signal after receiving the video source signal, transmits the high-code-stream video signal to the main cloud relay platform 30 and the standby cloud relay platform 40, and transmits the low-code-stream video signal to the manufacturing end 50, so that the manufacturing end 50 conducts switching on the basis of a plurality of paths of low-code-stream video signals to generate a low-code-stream program signal, and transmits the low-code-stream program signal to the main cloud relay platform 30 and the standby cloud relay platform 40, and the main cloud relay platform generates a corresponding high-code-stream program signal on the basis of the low-code-stream program signal and broadcasts the high-code-stream program signal. One end of the cloud rebroadcasting code rate adjusting device 10 is respectively connected with the plurality of video encoders 20, and the other end is respectively connected with the main cloud rebroadcasting platform 30, the standby cloud rebroadcasting platform 40 and the manufacturing end 50, and the cloud rebroadcasting code rate adjusting device 10 is used for executing the following cloud rebroadcasting code rate adjusting method to adjust the code rate of the video encoders 20, so that the code rate of the output high-code-stream video signals and the code rate of the output low-code-stream video signals are adapted to the network condition of the front end, and the occurrence of packet loss in the video transmission process is prevented.
Fig. 2 is a flowchart of a method for adjusting a cloud rebroadcasting code rate according to an embodiment of the present invention. Referring to fig. 2, the method may include the steps of:
and step S101, acquiring the front-end network state of the video encoder side based on the stream pushing situation of the video encoder.
Specifically, after receiving a video source signal, a video encoder encodes the video source signal to obtain a high-code-stream video signal and a low-code-stream video signal, and sends the high-code-stream video signal and the low-code-stream video signal to a cloud rebroadcasting code rate adjusting device, the cloud rebroadcasting code rate adjusting device copies multiple paths of high-code-stream signals, distributes each path of high-code-stream video signal to a main cloud rebroadcasting platform and a standby cloud rebroadcasting platform respectively, and sends multiple paths of low-code-stream video signals to a manufacturing end. When the video encoder pushes the stream, if the network condition of the site side fluctuates, the stability of the push stream is influenced, the frame loss of the video data is caused, and the watching effect after the subsequent decoding is influenced, so that the front-end network state of the video encoder side is monitored in real time when the video encoder pushes the stream.
In one embodiment, the streaming scenario of the video encoder may include a frame loss rate. And after receiving the video signal sent by the video encoder, the cloud rebroadcasting network adjusting device judges the frame loss rate of the data. If the frame loss rate of the video encoder plug flow is less than the preset threshold, the network condition at the site side is good, and if the frame loss rate of the video encoder plug flow is greater than or equal to the preset threshold, the network condition measured at the site is reduced, and the output code rate of the video encoder needs to be adjusted in time.
Step S102, according to the front-end network state and a preset regulation strategy, sending a code rate control signal to a video encoder so as to enable the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal to be adaptive to the current network state.
Specifically, the cloud relay network adjusting device comprises a video stream analysis processing module, wherein the video stream analysis processing module is used for receiving a high-code-stream video signal and a low-code-stream video signal sent by a video encoder, and analyzing the state of a front-end network based on the received high-code-stream video signal and the received low-code-stream video signal. When the video stream analysis processing module detects that the front-end network state of the video encoder fluctuates, a code rate control signal is sent to the video encoder according to a preset regulation strategy and the front-end network state, and the video encoder controls the code rate of the output high-code-stream video signal and the code rate of the output low-code-stream video signal according to the received code rate control signal. For example, if a video encoder sends 1 ten thousand data packets, but 300 data packets received by the video stream analysis processing module side are lost, the video stream analysis processing module needs to send a code rate adjustment control instruction to the video encoder, so that the video encoder adjusts the code rates of the output high code stream signal and low code stream signal.
In one embodiment, when the network quality corresponding to the network state at the front end is reduced, a first code rate control signal is sent to the video encoder, so that the video encoder reduces the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal, and the code rates of the high-code-stream video signal and the low-code-stream video signal are adapted to the network state.
Specifically, the corresponding relationship between the frame loss rate and the rate control signal is preset in the video stream analysis processing module, so that the rate of the video encoder is adapted to the current network state. For example, when the video stream analysis processing module determines that the front-end network state meets the first preset state, a first code rate down-regulation signal is sent to the video encoder, and the video encoder down-regulates the code rates of the high-stream video signal and the low-stream video signal according to the first code rate down-regulation signal. When the video stream analysis processing module judges that the front-end network state meets a second preset state, a second code rate down-regulation signal is sent to the video encoder, the video encoder down-regulates the code rates of the high-code-stream video signal and the low-code-stream video signal according to the second code rate down-regulation signal, wherein the network quality of the second preset state is poor compared with the network quality of the first preset state, and the code rate of the video encoder after being regulated according to the second code rate down-regulation signal is lower than the code rate after being regulated according to the first code rate regulation signal. In this embodiment, when the input video signal is a high-definition video signal, the code rate of the high-code-stream video signal may be reduced from 8M to 5M, 4M, 3M, and the like along with the dynamic change of the front-end network state, and the code rate of the low-code-stream video signal may be reduced from 1M to 720K, 480K, 320K, and the like. When the input video signal is a 4K video signal, the code rate of the high-stream video signal can be reduced from 30M to 20M, 15M, 10M, etc., and the code rate of the low-stream video signal can be reduced from 1M to 720K, 480K, 320K, etc.
Further, in one embodiment, when the code rate of the high-code-stream video signal is decreased to be less than the first preset code rate and the front-end network state continues to decrease, a closing signal is sent to the standby cloud relay platform, so that the standby cloud relay platform is closed.
Specifically, if the code rate of the high-code-stream video signal is reduced to be smaller than a first preset code rate, but the video stream processing module still detects that the quality of the current front-end network state is reduced, the video stream processing module sends a closing signal to the standby cloud relay platform to close the standby cloud relay platform, so that the standby cloud relay platform does not receive the high-code-stream video signal any more, the bandwidth pressure is reduced, and the video transmission quality of the main cloud relay platform is improved. For example, when the code rate of the high-code stream video signal of the high-definition video signal is reduced to 3M and the front-end network condition is continuously reduced, the standby cloud relay platform is closed, and the main cloud relay platform is reserved. And when the code rate of the high-code-stream video signal of the 4K video signal is reduced to 10M and the front-end network condition is continuously reduced, closing the standby cloud rebroadcasting platform and reserving the main cloud rebroadcasting platform.
In one embodiment, when the network quality corresponding to the front-end network state returns, a second code rate control signal is sent to the video encoder, so that the video encoder increases the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal.
Specifically, if the standby cloud relay platform is closed due to poor front-end network quality, when the video stream analysis processing module detects that the front-end network state rises and the code rate of the high-code-stream video signal is greater than a preset threshold value, a start signal is sent to the standby cloud relay platform, so that the standby cloud relay platform is started. When the network status continuously rises, the video stream analysis processing module sends a second code rate control signal to the video encoder, so that the video encoder improves the code rates of the high-code-stream video signal and the low-code-stream video signal. In this embodiment, when the video source signal is a high-definition video signal, if the code rate of the high-code-stream video signal is higher than 3M, the video stream processing and analyzing module controls to restore the standby cloud rebroadcasting platform. With the back-up of the front-end network state, the code rate is self-adaptively back-up, and the code rate of the high-code-stream video signal can be increased from 3M to 4M, 5M to 8M. The video source analysis processing module can comprehensively judge based on factors such as frame loss rate, stream stability and the like, and control the output code rate of the video encoder to be dynamically maintained at a code rate which not only ensures the quality, but also ensures the transmission reliability. The code rate of the low-code-stream video signal is matched with that of the high-code-stream video signal, and is increased from 320K to 480K, 720K to 1M. When the video source signal is a 4K video signal, the code rate of the high-stream video signal can be increased from 10M to 15M, 20M, and up to 30M. The code rate of the low-stream video signal can be increased from 320K to 480K, 720K and up to 1M.
In one embodiment, the cloud rebroadcasting code rate adjusting method further includes: the method comprises the steps of obtaining a first real-time state of a main cloud relay platform and a second real-time state of a standby cloud relay platform, and judging whether the main cloud relay platform and the standby cloud relay platform are abnormal or not according to the first real-time state and the second real-time state. When the main cloud rebroadcasting platform is abnormal, a switching signal is sent to the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform, so that the standby cloud rebroadcasting platform starts the main mode to work, and the main cloud rebroadcasting platform starts the standby mode to work.
Specifically, the cloud rebroadcasting code rate adjusting device further comprises a main/standby switching judgment module, and the main/standby switching judgment module is used for monitoring the states of the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform in real time. When the main cloud rebroadcasting platform is abnormal, a switching signal is sent to the standby cloud rebroadcasting platform so as to switch the standby cloud rebroadcasting platform to the main cloud rebroadcasting platform. In this embodiment, the cloud relay system may include at least one standby cloud relay platform, and when the cloud relay system includes a plurality of standby cloud relay platforms, the active/standby switching determination module monitors the state of each standby cloud relay platform in real time, and switches to any one of the standby cloud relay platforms in a normal state when the active cloud relay platform is abnormal. And after switching, the standby cloud rebroadcasting platform outputs high-code-stream program signals to the playing end for the user to watch.
Furthermore, the cloud relay system further comprises a time service server, and the time service server is connected with each video encoder and used for providing time service for each video encoder. Each video encoder also comprises a synchronous time service module which is used for obtaining time information from the time service server. When a high-code-stream coding module and a low-code-stream coding module in a video coder code a video source, timestamp information is respectively marked on a high-code-stream video signal and a low-code-stream video signal obtained by coding according to time information. Taking the high code stream encoding module as an example, when encoding a video source signal, the high code stream encoding module respectively stamps an absolute timestamp on each video frame according to the time information and the sequence of the video frames in the video source signal, and encodes the video source signal. The timestamp information for each video frame may include, among other things, the number of hours, minutes, seconds, and frames. The coding mode of the low code stream coding module is the same as that of the high code stream coding module. In this embodiment, the timestamp information of each frame in the high-stream video signal and the timestamp information of the corresponding frame in the low-stream video signal belonging to the same video source signal are the same.
Each video encoder sends the low-code-stream video signals to the manufacturing end, so that the manufacturing end synchronizes each path of low-code-stream video signals according to the timestamp information of the low-code-stream video signals, and sends the high-code-stream video signals to the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform, so that the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform synchronize each path of high-code-stream video signals according to the timestamp information of the high-code-stream video signals. And the working personnel carries out program signal production at the production end based on the synchronized low-code-stream video signals, the production end reduces the code-stream program signals and sends the reduced-code-stream program signals to the main cloud rebroadcasting platform, and the main cloud rebroadcasting platform generates corresponding high-code-stream program signals according to the low-code-stream program signals. According to the embodiment, the timestamp information is printed on the high-code-stream video signal and the low-code-stream video signal, so that the high-code-stream video signal and the low-code-stream video signal can be synchronized based on the timestamp information, and further, when subsequent guide switching is carried out, the black field problem caused by the asynchronous multi-channel video can be avoided, and the video playing quality is improved.
The cloud rebroadcasting code rate adjustment method provided by the embodiment obtains the front-end network state of the video encoder side through the stream pushing condition based on the video encoder, and sends the code rate control signal to the video encoder according to the front-end network state and the preset adjustment strategy, so that the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal are adapted to the current network state, and thus when the front-end network fluctuates, the stream pushing code stream can adapt to the front-end network state, the frame loss of the stream pushing is prevented, the stream pushing stability is improved, the video playing quality is improved, and the user watching experience is improved.
One embodiment of the invention is described below with reference to fig. 3:
step S301, the multiple encoders send the high-code-stream video signals and the low-code-stream video signals obtained by encoding to the video stream processing and analyzing module.
Step S302, the video stream processing and analyzing module judges the state of the front-end network based on the stream pushing situation of the encoder.
Step S303, when the network state of the front end changes, a code rate control signal is sent to a plurality of video encoders. For example, when the front-end network state is decreased, a first code rate control signal is sent to the plurality of video encoders to enable the plurality of video encoders to reduce the code rates of the high-stream video signal and the low-stream video signal, and when the front-end network state is increased, a second code rate control signal is sent to the plurality of video encoders to enable the plurality of video encoders to improve the code rates of the high-stream video signal and the ground-stream video signal.
Step S304, a plurality of video encoders receive the code rate control signal and adjust the stream pushing code rate according to the code rate control signal.
Step S305, the multiple video encoders push streams based on the changed code rates, that is, push the high-bit-stream video signals and the low-bit-stream video signals with changed code rates to the video stream processing word segmentation module.
Step S306, the video stream processing and analyzing module copies the multiple paths of high-code-stream video signals, and sends each path of high-code-stream video signal to the main cloud relay platform and the standby cloud relay platform respectively.
Step S307, the multi-path low-code-stream video signals are sent to the manufacturing end, so that the manufacturing end conducts switching to generate low-code-stream program signals based on the low-code-stream video signals, and the low-code-stream program signals are sent to the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform, so that the main cloud rebroadcasting platform outputs corresponding high-code-stream program signals.
Step S308, the active/standby switching determination module acquires the states of the active cloud relay platform and the standby cloud relay platform in real time.
Step S309, the active/standby switching determination module determines whether the active cloud relay platform and the standby cloud relay platform are abnormal based on the states of the active cloud relay platform and the standby cloud relay platform.
Step S310, when the main cloud relay platform is abnormal, the main/standby switching decision module sends a switching signal to the main cloud relay platform and the standby cloud relay platform, so that the main cloud relay platform starts the standby mode to operate, and the standby cloud relay platform starts the main mode to operate.
Step S311, the manufacturing end sends the low code stream program signal to the switched main cloud relay platform, so that the switched main cloud relay platform generates a corresponding high code stream program signal.
The cloud rebroadcasting code rate adjustment method provided by the embodiment obtains the front-end network state of the video encoder side through the stream pushing condition based on the video encoder, and sends the code rate control signal to the video encoder according to the front-end network state and the preset adjustment strategy, so that the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal are adapted to the current network state, and thus when the front-end network fluctuates, the stream pushing code stream can adapt to the front-end network state, the frame loss of the stream pushing is prevented, the stream pushing stability is improved, the video playing quality is improved, and the user watching experience is improved. In addition, through the deployment of the standby cloud rebroadcasting platforms, when one of the cloud rebroadcasting platforms is abnormal and cannot work, the standby cloud rebroadcasting platform can be started, so that the interruption of live broadcasting is prevented.
Furthermore, another embodiment of the present application provides a computer-readable storage medium having a cloud rebroadcasting rate adjustment program stored thereon, where the cloud rebroadcasting rate adjustment program, when executed by a processor, implements the cloud rebroadcasting rate adjustment method.
According to the computer-readable storage medium, by the cloud rebroadcasting code rate adjusting method, when the front-end network fluctuates, the stream pushing code stream can adapt to the state of the front-end network, the frame loss of the stream pushing is prevented, the stream pushing stability is improved, the video playing quality is further improved, and the user watching experience is improved.
In addition, another embodiment of the present application provides a cloud rebroadcasting code rate adjustment apparatus, which includes a memory, a processor, and a cloud rebroadcasting code rate adjustment program that is stored in the memory and can be run on the processor, and when the processor executes the cloud rebroadcasting code rate adjustment program, the cloud rebroadcasting code rate adjustment method is implemented.
According to the cloud rebroadcasting code rate adjusting device, by the cloud rebroadcasting code rate adjusting method, when the front-end network fluctuates, the stream pushing code stream can adapt to the state of the front-end network, the frame loss of the stream pushing is prevented, the stream pushing stability is improved, the video playing quality is improved, and the watching experience of a user is improved.
As shown in fig. 1, another embodiment of the present application provides a cloud relay system, which includes the foregoing cloud relay bitrate adjusting apparatus 10. The cloud relay system further includes a plurality of video encoders 20, a main cloud relay platform 30, a standby cloud relay platform 40, and a production end 50. Each video encoder 20 is configured to receive a video source signal and encode the video source signal into a high-code-stream video signal and a low-code-stream video signal. The producing terminal 50 is configured to receive the multiple paths of low-stream video signals and perform a pilot switching based on the multiple paths of low-stream video signals to generate low-stream program signals. The main cloud relay platform 30 and the standby cloud relay platform 40 are configured to receive multiple paths of high-code-stream video signals, and generate corresponding high-code-stream program signals according to the low-code-stream program signals. One end of the cloud relay code rate adjusting device 10 is connected to the plurality of video encoders 20, and the other end is connected to the main cloud relay platform 30, the standby cloud relay platform 40, and the manufacturing end 50, respectively, the cloud relay code rate adjusting device 10 is configured to obtain a front-end network state of the video encoder side based on a stream pushing situation of the video encoder, and send a code rate control signal to the video encoder according to the front-end network state and a preset adjusting strategy, so that a code rate of a high-bit-stream video signal and a code rate of a low-bit-stream video signal are adapted to a current network state.
In one embodiment, when the network quality corresponding to the network state at the front end is decreased, the cloud relay broadcast code rate adjusting device 10 is specifically configured to send a first code rate control signal to the video encoder 20, so that the video encoder 20 decreases the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal, so that the code rates of the high-code-stream video signal and the low-code-stream video signal are adapted to the network state.
In one embodiment, when the code rate of the high-code-stream video signal is decreased to be less than the first preset code rate and the front-end network status is continuously decreased, the cloud relay code rate adjustment device 10 is specifically configured to send a shutdown signal to the standby cloud relay platform 40, so that the standby cloud relay platform 40 is shutdown.
In one embodiment, when the network quality corresponding to the front-end network state returns, the cloud relay code rate adjustment device 10 is specifically configured to send the second code rate control signal to the video encoder 20, so that the video encoder 20 increases the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal.
In one embodiment, the cloud relay code rate adjusting device 10 is further configured to obtain a first real-time state of the main cloud relay platform 30 and a second real-time state of the standby cloud relay platform 40, determine whether the main cloud relay platform 30 and the standby cloud relay platform 40 are abnormal according to the first real-time state and the second real-time state, and send a switching signal to the main cloud relay platform 30 and the standby cloud relay platform 40 when the main cloud relay platform 30 is abnormal, so that the standby cloud relay platform 40 starts the main mode operation, and the main cloud relay platform 30 starts the standby mode operation.
The cloud relay system provided by the above embodiment obtains the front-end network state of the video encoder side based on the stream pushing situation of the video encoder through the cloud relay code rate adjusting device, and sends the code rate control signal to the video encoder according to the front-end network state and the preset adjusting strategy, so that the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal are adapted to the current network state, and therefore when the front-end network fluctuates, the stream pushing code stream can adapt to the front-end network state, frame loss in the stream pushing is prevented, the stream pushing stability is improved, the video playing quality is further improved, and the user watching experience is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. A cloud rebroadcasting code rate adjusting method is characterized in that a cloud rebroadcasting system comprises a video encoder, a main cloud rebroadcasting platform, a standby cloud rebroadcasting platform and a manufacturing end, wherein the video encoder is used for sending high-code-stream video signals to the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform and sending low-code-stream video signals to the manufacturing end, and the method comprises the following steps:
acquiring a front-end network state of the video encoder side based on the stream pushing condition of the video encoder;
and sending a code rate control signal to the video encoder according to the front-end network state and a preset regulation strategy so as to enable the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal to be adaptive to the current network state.
2. The method of claim 1, wherein sending a bitrate control signal to the video encoder according to the front-end network status and a preset adjustment policy comprises:
and when the network quality corresponding to the front-end network state is reduced, sending a first code rate control signal to the video encoder, so that the video encoder reduces the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal, and the code rates of the high-code-stream video signal and the low-code-stream video signal are adapted to the network state.
3. The method for adjusting cloud rebroadcasting code rate according to claim 2, wherein when the code rate of the high-bit-rate video signal is decreased to be less than a first preset code rate and the state of the front-end network is continuously decreased, a shutdown signal is sent to the standby cloud rebroadcasting platform to shutdown the standby cloud rebroadcasting platform.
4. The method of claim 2, wherein sending a bitrate control signal to the video encoder according to the front-end network status and a preset adjustment policy, further comprises:
and when the network quality corresponding to the front-end network state returns, sending a second code rate control signal to the video encoder, so that the video encoder improves the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal.
5. The method of claim 1, wherein the method further comprises:
acquiring a first real-time state of the main cloud relay platform and a second real-time state of the standby cloud relay platform, and judging whether the main cloud relay platform and the standby cloud relay platform are abnormal or not according to the first real-time state and the second real-time state;
when the main cloud rebroadcasting platform is abnormal, switching signals are sent to the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform, so that the standby cloud rebroadcasting platform starts the main mode to work, and the main cloud rebroadcasting platform starts the standby mode to work.
6. The method of claim 1, wherein the stream-pushing situation of the video encoder comprises a frame loss rate.
7. A computer-readable storage medium having stored thereon a cloud rebroadcasting rate adjustment program which, when executed by a processor, implements the cloud rebroadcasting rate adjustment method according to any one of claims 1 to 6.
8. A cloud rebroadcasting rate adjustment device, comprising a memory, a processor, and a cloud rebroadcasting rate adjustment program stored in the memory and executable on the processor, wherein the processor implements the cloud rebroadcasting rate adjustment program to implement the cloud rebroadcasting rate adjustment method according to any one of claims 1 to 6.
9. A cloud relay system, comprising the cloud relay bitrate adjusting apparatus according to claim 8;
the cloud relay system further includes: a plurality of video encoders, a main cloud rebroadcasting platform, a standby cloud rebroadcasting platform and a manufacturing end, wherein,
each video encoder is used for receiving a video source signal and encoding the video source signal into a high-code-stream video signal and a low-code-stream video signal;
the manufacturing end is used for receiving the multi-path low-code-stream video signals and conducting cutting based on the multi-path low-code-stream video signals to generate low-code-stream program signals;
the main cloud rebroadcasting platform and the standby cloud rebroadcasting platform are used for receiving a plurality of paths of high-code-stream video signals and generating corresponding high-code-stream program signals according to the low-code-stream program signals;
one end of the cloud rebroadcasting code rate adjusting device is respectively connected with the plurality of video encoders, the other end of the cloud rebroadcasting code rate adjusting device is respectively connected with the main cloud rebroadcasting platform, the standby cloud rebroadcasting platform and the manufacturing end, the cloud rebroadcasting code rate adjusting device is used for acquiring the front end network state of the video encoder side based on the stream pushing situation of the video encoders, and sending a code rate control signal to the video encoders according to the front end network state and a preset adjusting strategy so as to enable the code rate of the high-code-stream video signal and the code rate of the low-code-stream video signal to be adaptive to the current network state.
10. The cloud relay system of claim 9, wherein when the network quality corresponding to the front-end network state is degraded, the cloud relay bitrate adjustment device is specifically configured to send a first bitrate control signal to the video encoder, so that the video encoder reduces a bitrate of the high-stream video signal and a bitrate of the low-stream video signal, so as to adapt the bitrate of the high-stream video signal and the bitrate of the low-stream video signal to the network state.
11. The cloud relay system according to claim 10, wherein when the code rate of the high-bit-rate video signal is decreased to be smaller than a first preset code rate and the front-end network status is continuously decreased, the cloud relay code rate adjustment device is specifically configured to send a shutdown signal to the standby cloud relay platform, so that the standby cloud relay platform is shutdown.
12. The cloud relay system of claim 10, wherein when the network quality corresponding to the front-end network status returns, the cloud relay bitrate adjustment device is specifically configured to send a second bitrate control signal to the video encoder, so that the video encoder increases the bitrate of the high-stream video signal and the bitrate of the low-stream video signal.
13. The cloud relay system of claim 9, wherein the cloud relay code rate adjusting device is further configured to obtain a first real-time status of the main cloud relay platform and a second real-time status of the standby cloud relay platform, determine whether the main cloud relay platform and the standby cloud relay platform are abnormal according to the first real-time status and the second real-time status, and send a switching signal to the main cloud relay platform and the standby cloud relay platform when the main cloud relay platform is abnormal, so that the standby cloud relay platform starts to operate in a main mode, and the main cloud relay platform starts to operate in a standby mode.
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