CN113453086A - Multi-machine-position synchronous cloud broadcasting guiding method, system, storage medium and video encoder - Google Patents
Multi-machine-position synchronous cloud broadcasting guiding method, system, storage medium and video encoder Download PDFInfo
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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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- 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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- 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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/218—Source of audio or video content, e.g. local disk arrays
- H04N21/2187—Live feed
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/695—Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
- H04N5/067—Arrangements or circuits at the transmitter end
- H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations
- H04N5/0733—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations for distributing synchronisation pulses to different TV cameras
Abstract
The invention discloses a multi-machine-position synchronous cloud director method, a multi-machine-position synchronous cloud director system, a storage medium and a video encoder, which can align multi-channel video source signals based on absolute timestamps to synchronize the multi-channel video signals so as to ensure that videos are coherent in the director cutting process and prevent the problems of black fields and the like. In addition, the method can realize low-time delay switching capability by making the program signal based on the low-code-stream video signal at the broadcasting guide client, and realize output of the corresponding high-code-stream program signal at the cloud broadcasting guide server based on the absolute timestamp of the low-code-stream program signal, thereby greatly reducing the processing pressure of the cloud broadcasting guide server.
Description
This application is based on the application number: 202110335210.6 filed on, and claiming priority from, the chinese patent application having a filing date of 29/03 of 2021, which is hereby incorporated by reference in its entirety.
Technical Field
The invention relates to the technical field of director, in particular to a multi-machine-position synchronous cloud director method, a multi-machine-position synchronous cloud director system, a storage medium and a video encoder.
Background
In the traditional relay broadcasting, a plurality of machine positions need to be erected on site, signals of the machine positions are transmitted to a relay broadcasting vehicle through SDI (serial digital interface) physical lines, and the relay broadcasting switching of multi-machine position signals and the dispatching control of a front-end camera are performed in the relay broadcasting vehicle, but the traditional relay broadcasting vehicle is limited by the factors of limited use scene, complex field wiring and the like, and the cloud relay broadcasting technology is a current development trend.
In the cloud relay process, video signals collected by multiple cameras are packaged in an Internet Protocol (IP) manner and then transmitted to a cloud relay server via a network. In the network transmission process, due to different packet loss or disorder conditions caused by different links and different time delays of different paths, the cloud director server receives multi-machine signals asynchronously, and further the director switching process is discontinuous, and problems such as a black field occur.
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 object of the present invention is to provide a multi-station synchronous cloud director method, which can perform video synchronization between multiple stations.
A second object of the invention is to propose a computer-readable storage medium.
A third object of the present invention is to provide a video encoder.
The fourth purpose of the present invention is to provide a multi-station synchronous cloud director system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a multi-machine synchronous cloud director method, including: receiving multiple paths of video source signals, and inputting absolute timestamps into high-code-stream video signals and low-code-stream video signals obtained by coding according to the acquired absolute time information when each path of video source signals is coded; sending each path of low-code-stream video signal to a broadcast guiding client so that the broadcast guiding client aligns each path of low-code-stream video signal according to an absolute timestamp of the low-code-stream video signal and outputs a low-code-stream program signal to a cloud broadcast guiding server according to a received broadcast guiding instruction; and sending each path of high-code stream signal to a cloud broadcasting guide server so that the cloud broadcasting guide server aligns each path of high-code stream video signal according to an absolute timestamp of the high-code stream video signal, and acquiring a high-code stream program signal corresponding to the absolute timestamp from the high-code stream video signal according to an absolute timestamp corresponding to a low-code stream program signal sent by a broadcasting guide client.
According to the multi-station synchronous cloud broadcasting method provided by the embodiment of the invention, when each video source signal is coded by receiving a plurality of paths of video source signals, an absolute timestamp is added into a high-code-stream video signal and a low-code-stream video signal obtained by coding according to the obtained absolute time information, each path of low-code-stream video signal is sent to a broadcasting client side, so that the broadcasting client side aligns each path of low-code-stream video signal according to the absolute timestamp of the low-code-stream video signal, a low-code-stream program signal is output to a cloud broadcasting server according to a received switching instruction, each path of high-code-stream signal is sent to the cloud broadcasting server, so that the cloud broadcasting server aligns each path of high-code-stream video signal according to the absolute timestamp of the high-code-stream video signal, and a high-code-stream program signal corresponding to the absolute timestamp of the low-code-stream program signal sent by the broadcasting client side is obtained from the high-code-stream video signal, therefore, the multichannel video source signals can be aligned based on the absolute time stamps, the multichannel video signals are synchronized, the videos are coherent in the guide cutting process, and the problems of black fields and the like are prevented. In addition, the method can realize low-time delay switching capability by making the program signal based on the low-code-stream video signal at the broadcasting guide client, and realize output of the corresponding high-code-stream program signal at the cloud broadcasting guide server based on the absolute timestamp of the low-code-stream program signal, thereby greatly reducing the processing pressure of the cloud broadcasting guide server.
According to one embodiment of the present invention, the absolute time information is obtained by: judging whether GPS absolute time information is received or not; when the GPS absolute time information is received, respectively inputting the high-code-stream video signal and the low-code-stream video signal into a GPS absolute timestamp according to the GPS absolute time information; and when the GPS absolute time information is not received, acquiring network absolute time information so as to respectively input network absolute timestamps for the high-code-stream video signal and the low-code-stream video signal according to the network absolute time information.
According to an embodiment of the present invention, further comprising: receiving a camera control signal sent by the broadcast guiding client; and controlling the corresponding camera to move according to the camera control signal.
According to an embodiment of the present invention, further comprising: receiving a Tally control instruction sent by the director client; and controlling a Tally indicating lamp of the corresponding camera to send out an indication according to the Tally control instruction.
To achieve the above object, a second aspect of the present invention provides a computer-readable storage medium having a multi-machine-bit synchronous cloud director program stored thereon, where the multi-machine-bit synchronous cloud director program, when executed by a processor, implements the multi-machine-bit synchronous cloud director method.
According to the embodiment of the invention, by the multi-machine-position synchronous cloud director method, the multi-channel video source signals can be aligned based on the absolute timestamp, so that the multi-channel video signals are synchronized, the videos are coherent in the director process, and the problems of black fields and the like are prevented. Moreover, the program signal is produced on the basis of the low-code-stream video signal at the broadcast guiding client, the low-time-delay switching capability can be realized, and the corresponding high-code-stream program signal is output at the cloud broadcast guiding server on the basis of the absolute timestamp of the low-code-stream program signal, so that the processing pressure of the cloud broadcast guiding server can be greatly reduced.
In order to achieve the above object, a video encoder according to a third aspect of the present invention includes a memory, a processor, and a multi-bit synchronization cloud director program stored in the memory and executable on the processor, where the processor implements the multi-bit synchronization cloud director method when executing the multi-bit synchronization cloud director program.
According to the video encoder provided by the embodiment of the invention, through the multi-machine-bit synchronous cloud director method, the multi-channel video source signals can be aligned based on the absolute timestamp, so that the multi-channel video signals are synchronized, the video is coherent in the director process, and the problems of black fields and the like are prevented. Moreover, the program signal is produced on the basis of the low-code-stream video signal at the broadcast guiding client, the low-time-delay switching capability can be realized, and the corresponding high-code-stream program signal is output at the cloud broadcast guiding server on the basis of the absolute timestamp of the low-code-stream program signal, so that the processing pressure of the cloud broadcast guiding server can be greatly reduced.
In order to achieve the above object, a fourth aspect of the present invention provides a multi-machine-position synchronous cloud director system, including: the system comprises a plurality of video encoders, a plurality of video encoder and a plurality of video decoder, wherein each video encoder is used for receiving a video source signal, and when each video encoder encodes the video source signal, an absolute timestamp is added into a high-code-stream video signal and a low-code-stream video signal obtained by encoding according to acquired absolute time information; the broadcast guide client is respectively connected with each video encoder and used for receiving each path of low-code-stream video signal, aligning each path of low-code-stream video signal according to an absolute timestamp of the low-code-stream video signal and outputting a low-code-stream program signal according to a received switch instruction; the cloud broadcasting guide server is respectively connected with the broadcasting guide client and each video encoder, and is used for receiving high-code-stream video signals sent by each video encoder, aligning each high-code-stream video signal according to an absolute timestamp of the high-code-stream video signals, and acquiring high-code-stream program signals corresponding to the absolute timestamp from the high-code-stream video signals according to the absolute timestamp corresponding to low-code-stream program signals output by the broadcasting guide client.
According to one embodiment of the present invention, each of the video encoders includes: the absolute time acquisition module is used for acquiring absolute time information; the high code stream coding module is connected with the absolute time acquisition module and is used for coding the received video source signal into a high code stream video signal and adding a timestamp into the high code stream video signal according to the absolute time information received by the absolute time acquisition module; and the low code stream coding module is connected with the absolute time acquisition module and is used for coding the received video source signal into a low code stream video signal and adding a timestamp into the low code stream video signal according to the absolute time information received by the absolute time acquisition module.
According to an embodiment of the present invention, the absolute time acquiring module includes a GPS time acquiring unit and a network time acquiring unit, wherein the GPS time acquiring unit is configured to acquire GPS absolute time information, and the network time acquiring unit is configured to acquire network absolute time information.
According to an embodiment of the present invention, the GPS time obtaining unit is respectively connected to the high code stream encoding module and the low code stream encoding module, and when the GPS time obtaining unit obtains the GPS absolute time information, the high code stream encoding module and the low code stream encoding module respectively inject GPS absolute timestamps into the high code stream video signal and the low code stream video signal according to the GPS absolute time information; the network time obtaining unit is respectively connected with the high code stream coding module and the low code stream coding module, and when the GPS time obtaining unit does not obtain the GPS absolute time information, the high code stream coding module and the low code stream coding module respectively inject the high code stream video signal and the low code stream video signal into a network absolute timestamp according to the network absolute time information.
According to an embodiment of the present invention, the multi-machine-position synchronous cloud director system further includes a plurality of cameras, and each of the cameras is correspondingly connected to each of the video encoders; each video encoder further comprises an interaction module, the interaction module is connected with the director client, and the interaction module is used for receiving a camera control signal sent by the director client and controlling the corresponding camera to move according to the camera control signal.
According to an embodiment of the present invention, each of the video encoders further includes a Tally module, the Tally module is connected to the director client, and the Tally module is configured to receive a Tally control instruction sent by the director client; each camera further comprises a Tally indicator light, each Tally indicator light is correspondingly connected with each Tally module, and the Tally indicator light is used for giving out an indication under the action of the Tally control instruction.
According to the multi-machine-position synchronous cloud broadcasting guide system provided by the embodiment of the invention, a plurality of video encoders are used for inputting absolute timestamps into high-code-stream video signals and low-code-stream video signals obtained by encoding according to acquired absolute time information, each path of low-code-stream video signals are received through a broadcasting guide client, each path of low-code-stream video signals are aligned according to the absolute timestamps of the low-code-stream video signals, low-code-stream program signals are output according to received switching instructions, high-code-stream video signals sent by each video encoder are received through a cloud broadcasting guide server, each path of high-code-stream video signals are aligned according to the absolute timestamps of the high-code-stream video signals, and high-code-stream program signals corresponding to the absolute timestamps are acquired from the high-code-stream video signals according to the absolute timestamps corresponding to the low-code-stream program signals output by the broadcasting guide client, therefore, the multichannel video source signals can be aligned based on the absolute time stamps, the multichannel video signals are synchronized, the videos are coherent in the guide cutting process, and the problems of black fields and the like are prevented. Moreover, the program signal is produced on the basis of the low-code-stream video signal at the broadcast guiding client, the low-time-delay switching capability can be realized, and the corresponding high-code-stream program signal is output at the cloud broadcast guiding server on the basis of the absolute timestamp of the low-code-stream program signal, so that the processing pressure of the cloud broadcast guiding server can be greatly reduced.
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 multi-robot synchronous cloud director system according to one embodiment of the present invention;
fig. 2 is a flowchart of a multi-machine synchronous cloud director method according to an embodiment of the present invention;
fig. 3 is an interaction diagram of a multi-machine synchronous cloud director system according to an embodiment of the present invention;
fig. 4 is an architecture diagram of a multi-robot synchronous cloud director system according to another 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.
A multi-bit synchronous cloud director method, a system, a storage medium, and a video encoder according to embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1, the multi-machine-synchronized cloud director system of the present embodiment includes a plurality of video encoders 100, a director client 200, and a cloud director server 300. The multi-machine synchronous cloud director system further comprises a plurality of cameras 400, wherein each camera 400 is correspondingly connected with one video encoder 100, and each camera 400 is used for collecting video source signals from different angles. Each video encoder 100 is configured to encode a video source signal collected by a corresponding video camera 400 to obtain a high-stream video signal and a low-stream video signal. The multi-machine-position synchronous cloud director system further comprises a time service server 500, wherein the time service server 500 is respectively connected with each video encoder 100, when the video encoders 100 encode high and low code streams, absolute timestamps are respectively added into high-code-stream video signals and low-code-stream video signals according to absolute time information acquired from the time service server 500, the low-code-stream video signals are sent to the director client 200, and the high-code-stream video signals are sent to the cloud director server 300.
A multi-machine synchronous cloud director method according to an embodiment of the present invention is described below with reference to fig. 2, the method being performed by the plurality of video encoders 100 shown in fig. 1, the method comprising the steps of:
and S101, receiving multiple paths of video source signals, and inputting absolute time stamps into high-code-stream video signals and low-code-stream video signals obtained by coding according to the acquired absolute time information when each path of video source signal is coded.
Specifically, each video encoder includes a high stream coding module and a low stream coding module. The high-code-stream coding module is used for coding a received video source signal into a high-code-stream video signal, the low-code-stream coding module is used for coding a received video source signal of the same path into a low-code-stream video signal, and the high-code-stream video signal and the low-code-stream video signal belonging to the same path of video source signal have a one-to-one mapping relation. The high-code-stream video signal and the low-code-stream video signal have the same video content, and only code rates are different between the high-code-stream video signal and the low-code-stream video signal. The high-code-stream video signal has a high code rate, high image definition and high occupied bandwidth. The low-code-stream video signal reduces the code rate in the image environment of the high-code-stream video signal, and the image picture of the low-code-stream video signal has higher definition and occupies less bandwidth.
In this embodiment, each video encoder further includes an absolute time obtaining module, configured to obtain absolute time information. And when the high-code-stream coding module and the low-code-stream coding module code a video source, respectively marking absolute timestamps for high-code-stream video signals and low-code-stream video signals obtained by coding according to the absolute 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 absolute time information and the sequence of the video frames in the video source signal, and encodes the video source signal. Where the absolute timestamp for each video frame may include an hour, minute, second, and frame number. 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 absolute timestamp of each frame in the high-stream video signal and the absolute timestamp of the corresponding frame in the low-stream video signal belonging to the same video source signal are the same.
In one embodiment, the absolute time information is obtained by: judging whether absolute time information of a Global Positioning System (GPS) is received or not; when the GPS absolute time information is received, respectively inputting high-code-stream video signals and low-code-stream video signals into a GPS absolute timestamp according to the GPS absolute time information; and when the GPS absolute time information is not received, acquiring the network absolute time information so as to respectively input network absolute timestamps for the high-code-stream video signal and the low-code-stream video signal according to the network absolute time information.
Specifically, the absolute time acquisition module of each video encoder includes a GPS time acquisition unit and a network time acquisition unit, where the GPS time acquisition unit is configured to acquire GPS absolute time information, and the network time acquisition unit is configured to acquire network absolute time information. If the current live broadcast site is located outdoors and the camera and the video encoder corresponding to the camera are located outdoors, the video encoder can acquire the GPS absolute time information through the GPS time acquisition unit and the network absolute time information through the network acquisition unit. That is, if the GPS absolute time information can be received, when the video encoder performs high-low code stream encoding, a GPS absolute timestamp is added to the high-code stream video signal and the low-code stream video signal according to the GPS absolute time information. If the current live broadcast site is located indoors, the video encoder cannot receive the GPS absolute time information, or the accuracy of the received GPS absolute time information is low, at the moment, the video encoder can acquire the network absolute time information through a 5G network, and respectively adds network absolute timestamps for high-code-stream video signals and low-code-stream video signals according to the network absolute time information.
And S102, sending each path of low-code-stream video signal to the director client so that the director client aligns each path of low-code-stream video signal according to the absolute timestamp of the low-code-stream video signal, and outputting a low-code-stream program signal to the cloud director server according to the received directing instruction.
Specifically, each video encoder sends a low-code-stream video signal generated by encoding to a director client, the director client decodes the low-code-stream video signal after receiving the low-code-stream video signal, and aligns each path of low-code-stream video signal based on an absolute timestamp of each path of low-code-stream video signal. After alignment, the director broadcasts the multi-channel video signals at the director client, the director selects one of the multi-channel video signals to conduct switching, and the director client outputs corresponding low-code-stream program signals according to a switching instruction input by the director, wherein the low-code-stream program signals also comprise corresponding absolute timestamps.
Step S103, each path of high-code-stream video signal is sent to a cloud broadcasting guide server, so that the cloud broadcasting guide server aligns each path of high-code-stream video signal according to an absolute timestamp of the high-code-stream video signal, and obtains a high-code-stream video signal corresponding to the absolute timestamp from the high-code-stream video signal according to an absolute timestamp corresponding to a low-code-stream program signal sent by a broadcasting guide client.
Specifically, each video encoder sends a high-code-stream video signal generated by encoding to the cloud directing server, and the cloud directing server aligns the multiple paths of high-code-stream video signals according to the absolute timestamp of each path of high-code-stream video signal after decoding the received multiple paths of high-code-stream video signals. After the broadcast guide client sends the low-code-stream program signals to the cloud broadcast guide server, the cloud broadcast guide server acquires high-code-stream program signals corresponding to the absolute timestamp according to the absolute timestamp of the low-code-stream program signals, and sends the high-code-stream program signals to the playing terminal for playing. In this embodiment, the cloud director server further stores the received high-stream video signals, and each path of high-stream video signal is provided with an absolute timestamp, so that secondary director creation can be subsequently realized by the cloud director server based on the synchronization signal.
Further, when a staff member of the broadcast guide client switches the currently played program signal to another program signal, the broadcast guide client acquires the latest absolute timestamp of the currently played program signal, acquires the target low-code-stream program signal pointed by the switch instruction according to the latest absolute timestamp, and continuously plays the program signal from the target video frame corresponding to the latest absolute timestamp of the target low-code-stream program signal during playing, so that the continuity of video playing is realized, and the situations of black fields and the like are prevented. And the cloud broadcasting guide server acquires the target high-code-stream program signal according to the latest absolute timestamp of the target low-code-stream program signal generated by the broadcasting guide client and outputs the target high-code-stream program signal to the playing terminal.
In the multi-station synchronous cloud broadcasting method provided by the above embodiment, when encoding each video source signal respectively, an absolute timestamp is added into a high-code-stream video signal and a low-code-stream video signal obtained by encoding according to the acquired absolute time information, each low-code-stream video signal is sent to the broadcasting client, so that the broadcasting client aligns each low-code-stream video signal according to the absolute timestamp of the low-code-stream video signal, outputs a low-code-stream program signal to the cloud broadcasting server according to a received switching instruction, sends each high-code-stream signal to the cloud broadcasting server, so that the cloud broadcasting server aligns each high-code-stream video signal according to the absolute timestamp of the high-code-stream video signal, and acquires a high-code-stream program signal corresponding to the absolute timestamp from the high-code-stream video signal according to the absolute timestamp corresponding to the low-code-stream program signal sent by the broadcasting client, therefore, the multichannel video source signals can be aligned based on the absolute time stamps, the multichannel video signals are synchronized, the videos are coherent in the guide cutting process, and the problems of black fields and the like are prevented. In addition, the method can realize low-time delay switching capability by making the program signal based on the low-code-stream video signal at the broadcasting guide client, and realize output of the corresponding high-code-stream program signal at the cloud broadcasting guide server based on the absolute timestamp of the low-code-stream program signal, thereby greatly reducing the processing pressure of the cloud broadcasting guide server.
In one embodiment, the method further comprises: receiving a camera control signal sent by a broadcast guide client; and controlling the corresponding camera to move according to the camera control signal.
Specifically, each video encoder comprises an interaction module, each interaction module is connected with a director client, and the director client can interact with the front-end video encoder in real time through the interaction modules so as to control the front-end video camera. At the director client, the director monitors each video source signal and gives a scheduling instruction of the next shot action. And the director client generates a camera control signal based on the scheduling instruction, sends the camera control signal to an interaction module of a corresponding video encoder, and controls the corresponding camera to move after receiving the control signal. For example, if the current live broadcast site includes 4 cameras, each camera has a corresponding number, i.e., number 1 to number 4. Accordingly, the video encoder of each camera also has a one-to-one correspondence number. The method includes the steps that a director monitors video source signals collected by 4 cameras at a director client, when the No. 1 camera needs to be moved, for example, the No. 1 camera is pushed, the director sends a No. 1 camera pushing instruction, the director client sends a control signal of the No. 1 camera to a No. 1 video encoder according to the pushing instruction of the No. 1 camera, and the No. 1 video encoder controls the No. 1 camera to execute pushing action according to the control signal. It should be noted that the camera in this embodiment is an intelligent camera, and the intelligent camera can automatically move according to the control signal.
In the multi-machine-position synchronous cloud broadcasting method provided by the embodiment, when the broadcasting guide client performs the broadcasting guide manufacturing process, the camera position change control is performed on the camera by monitoring the low-code-stream picture and performing real-time interaction with the front-end video encoder, and the low-code-stream interaction can greatly reduce the time delay and ensure the timeliness of the machine position control.
In one embodiment, the method further comprises: receiving a Tally control instruction sent by a director client; and controlling a Tally indicator lamp of the corresponding camera to give out an indication by the root Tally control instruction.
Specifically, each camera is provided with a Tally indicator light, each Tally indicator light is connected with a video encoder of the corresponding camera, each video encoder is internally provided with a Tally module, and each Tally module is connected with the director client respectively and is used for controlling the Tally indicator light of the camera according to the signals of the director client. After the director conducts the lens guide cutting, the program signal after the guide cutting is output by the camera m, the guide client interacts with the front-end video encoder m through Tally service and sends a Tally control instruction, and the front-end video encoder m controls a Tally indicator lamp of the front-end camera m to be lightened according to the Tally control instruction, so that the state of the Tally indicator lamp is consistent with the guide cutting instruction.
In the multi-machine synchronous cloud broadcasting method provided by the above embodiment, the broadcasting client transmits the Tally control signaling to the front-end video encoder through the Tally service, and the state of the Tally lamp of the front-end camera is controlled by the Tally module of the video encoder, so as to conform to the radio and television operation mode, and facilitate the live broadcasting field work to know the progress state of the program in time.
One embodiment of the invention is described below with reference to fig. 3:
step S201, a plurality of cameras respectively send acquired video source signals to corresponding video encoders;
step S202, each video encoder sends a network time service request to a network time service server respectively, wherein each video encoder comprises a 5G network module, and each video encoder sends the network time service request to the network time service server through the 5G network module;
step S203, the network time service server sends network absolute time information to each video encoder;
step S204, each video encoder sends a GPS time service request to a GPS time service server respectively, wherein each video encoder comprises a GPS module, and each video encoder sends the GPS time service request through the GPS module;
step S205, the GPS time service server sends GPS absolute time information to each video encoder;
step S206, each video encoder judges whether the acquired GPS absolute time information is valid, when the GPS absolute time information is valid, the GPS absolute time information is used as the absolute time information of the video encoder, and when the GPS absolute time information is invalid, the network absolute time information is used as the absolute time information of the video encoder;
step S207, each video encoder encodes the received video source signal respectively, and inputs an absolute timestamp into a high-code-stream video signal and a low-code-stream video signal obtained by encoding according to absolute time information;
step S208, each video encoder sends the low-code-stream video signal to the director client;
step S209, each video encoder sends the high-code-stream video signal to a cloud director server;
step S210, the director client can receive a camera control instruction input by a director, and send a camera control signal to a corresponding video encoder according to the camera control instruction so that the video encoder controls the corresponding camera to move;
step S211, the program director client can also receive a lens guide-cutting instruction input by the program director, and sends Tally control quality to a corresponding video encoder according to the lens guide-cutting instruction;
step S212, the video encoder controls the Tally indicator lamp of the corresponding camera to send out indication
Step S213, the broadcasting guide client generates a low-code-stream program signal according to the switching guide instruction and sends the low-code-stream program signal to the cloud broadcasting guide server;
step S214, the cloud broadcasting guide server acquires a high code stream program signal according to the absolute timestamp of the low code stream program signal;
in step S215, the cloud director server sends the high code stream program signal to the broadcast terminal for the viewer to watch.
According to the multi-machine-position synchronous cloud broadcasting guide method, the video encoder can improve the clock synchronization precision in a double-time acquisition mode; by making program signals based on low-code-stream video signals at the broadcast guide client, low-time-delay broadcast guide capability can be realized, and corresponding high-code-stream program signals are output at the cloud broadcast guide server based on absolute timestamps of the low-code-stream program signals, so that the processing pressure of the cloud broadcast guide server can be greatly reduced. In the process of conducting the director manufacturing at the director client, the real-time interaction with the front-end video encoder is carried out by monitoring the low-code-stream picture, so that the camera position change control is realized, the time delay can be greatly reduced through the low-code-stream interaction, and the timeliness of the camera position control is ensured.
Yet another embodiment of the present application provides a computer-readable storage medium having a multi-machine synchronous cloud director program stored thereon, which when executed by a processor, implements the aforementioned multi-machine synchronous cloud director method.
According to the computer-readable storage medium, through the multi-machine-position synchronous cloud director method, the multiple video source signals can be aligned based on the absolute time stamp, so that the multiple video source signals are synchronized, the videos are coherent in the director cutting process, and the problems of black fields and the like are prevented. Moreover, the program signal is produced on the basis of the low-code-stream video signal at the broadcast guiding client, the low-time-delay switching capability can be realized, and the corresponding high-code-stream program signal is output at the cloud broadcast guiding server on the basis of the absolute timestamp of the low-code-stream program signal, so that the processing pressure of the cloud broadcast guiding server can be greatly reduced.
Another embodiment of the present application provides a video encoder, which includes a memory, a processor, and a multi-bit synchronization cloud director program stored in the memory and operable on the processor, wherein the processor implements the multi-bit synchronization cloud director method when executing the multi-bit synchronization cloud director program.
According to the video encoder, through the multi-machine-position synchronous cloud broadcasting guide method, the multiple video source signals can be aligned based on the absolute time stamps, so that the multiple video source signals are synchronous, the videos are coherent in the guide cutting process, and the problems of black fields and the like are prevented. Moreover, the program signal is produced on the basis of the low-code-stream video signal at the broadcast guiding client, the low-time-delay switching capability can be realized, and the corresponding high-code-stream program signal is output at the cloud broadcast guiding server on the basis of the absolute timestamp of the low-code-stream program signal, so that the processing pressure of the cloud broadcast guiding server can be greatly reduced.
Further, as shown in fig. 1, yet another embodiment of the present application provides a multi-machine-synchronized cloud director system comprising a plurality of video encoders 100, a director client 200, and a cloud director server 300. Each video encoder 100 is configured to receive a video source signal, and each video encoder 100 adds an absolute timestamp to a high-code-stream video signal and a low-code-stream video signal obtained by encoding according to the obtained absolute time information when encoding the video source signal. The director client 200 is connected to each video encoder 100, and the director client 200 is configured to receive each low-stream video signal, align each low-stream video signal according to an absolute timestamp of the low-stream video signal, and output a low-stream program signal according to a received director switching instruction. The cloud director server 300 is connected to the director client 200 and each video encoder 100, respectively, and the cloud director server 300 is configured to receive a high-stream video signal sent by each video encoder 100, align each high-stream video signal according to an absolute timestamp of the high-stream video signal, and obtain a high-stream program signal corresponding to the absolute timestamp from the high-stream video signal according to an absolute timestamp corresponding to a low-stream program signal output by the director client 200.
As shown in fig. 4, in one embodiment, each video encoder 100 includes an absolute time acquisition module 110, a high stream coding module 120, and a low stream coding module 130. The absolute time obtaining module 110 is configured to obtain absolute time information. The high code stream encoding module 120 is connected to the absolute time acquiring module 110, and the high code stream encoding module 120 is configured to encode the received video source signal into a high code stream video signal, and to add a timestamp to the high code stream video signal according to the absolute time information received by the absolute time acquiring module 110. The low code stream encoding module 130 is connected to the absolute time acquiring module 110, and the low code stream encoding module 130 is configured to encode the received video source signal into a low code stream video signal, and to enter a timestamp into the low code stream video signal according to the absolute time information received by the absolute time acquiring module 110.
In this embodiment, as shown in fig. 1, the multi-machine-position synchronous cloud director system further includes a time service server 500, and the absolute time obtaining module 110 of each video encoder 100 is connected to the time service server 500, respectively, and is configured to obtain absolute time information from the time service server 500.
Further, as shown in fig. 4, the absolute time acquiring module 110 includes a GPS time acquiring unit 111 and a network time acquiring unit 112, wherein the GPS time acquiring unit 111 is used for acquiring GPS absolute time information, and the network time acquiring unit 112 is used for acquiring network absolute time information.
In this embodiment, as shown in fig. 4, the time service server 500 includes a network time service server 510 and a GPS clock server 520, and the GPS time obtaining unit 111 of each video encoder 100 is respectively connected to the GPS clock server 520 for obtaining GPS absolute time information. The network time obtaining unit 112 of each video encoder 100 is respectively connected to the network clock server 510 for obtaining the network absolute time information. The network time obtaining unit 112 may be a 5G module, and is configured to obtain the network absolute time information through a 5G network. In this embodiment, the network time service server 510 is further connected to the cloud director server 300, and is configured to time the cloud director server 300.
Further, the GPS time obtaining unit 111 is connected to the high code stream encoding module 120 and the low code stream encoding module 130, respectively, and when the GPS time obtaining unit 111 obtains GPS absolute time information, the high code stream encoding module 120 and the low code stream encoding module 130 respectively inject a GPS absolute timestamp for the high code stream video signal and the low code stream video signal according to the GPS absolute time information. The network time obtaining unit 112 is connected to the high code stream coding module 120 and the low code stream coding module 130, respectively, and when the GPS time obtaining unit 111 does not obtain the GPS absolute time information, the high code stream coding module 120 and the low code stream coding module 130 respectively add network absolute timestamps for the high code stream video signal and the low code stream video signal according to the network absolute time information.
As shown in fig. 4, in one embodiment, the multi-station synchronous cloud director system further comprises a plurality of cameras 400, and each camera 400 is correspondingly connected to each video encoder 100. Each video encoder 100 further includes an interaction module 140, the interaction module 140 is connected to the director client 200, and the interaction module 140 is configured to receive a camera control signal sent by the director client 200 and control the corresponding camera 400 to move according to the camera control signal.
As shown in fig. 4, in one embodiment, each video encoder further includes a Tally module 150, where the Tally module 150 is connected to the director client 200, and the Tally module 150 is configured to receive a Tally control instruction sent by the director client 200. Each camera further includes a Tally indicator (not shown in FIG. 4), and each Tally indicator is correspondingly connected to each Tally module 150, and the Tally indicator is used for giving out an indication under the action of a Tally control instruction.
It should be noted that, for the description of the multi-machine synchronous cloud broadcasting system in the present application, please refer to the description of the multi-machine synchronous cloud broadcasting method in the present application, and details are not repeated herein.
In the multi-station synchronous cloud broadcasting guide system, the absolute timestamps are input into high-code-stream video signals and low-code-stream video signals obtained by coding through the plurality of video encoders according to the acquired absolute time information, each path of low-code-stream video signals is received through the broadcasting guide client, each path of low-code-stream video signals is aligned according to the absolute timestamp of the low-code-stream video signals, low-code-stream program signals are output according to the received switching instruction, the high-code-stream video signals sent by each video encoder are received through the cloud broadcasting guide server, each path of high-code-stream video signals is aligned according to the absolute timestamp of the high-code-stream video signals, and the high-code-stream program signals corresponding to the absolute timestamp are acquired from the high-code-stream video signals according to the absolute timestamp corresponding to the low-code-stream program signals output by the broadcasting guide client, therefore, the multichannel video source signals can be aligned based on the absolute time stamps, the multichannel video signals are synchronized, the videos are coherent in the guide cutting process, and the problems of black fields and the like are prevented. Moreover, the program signal is produced on the basis of the low-code-stream video signal at the broadcast guiding client, the low-time-delay switching capability can be realized, and the corresponding high-code-stream program signal is output at the cloud broadcast guiding server on the basis of the absolute timestamp of the low-code-stream program signal, so that the processing pressure of the cloud broadcast guiding server can be greatly reduced.
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 (12)
1. A multi-machine synchronous cloud broadcasting method is characterized by comprising the following steps:
receiving multiple paths of video source signals, and inputting absolute timestamps into high-code-stream video signals and low-code-stream video signals obtained by coding according to the acquired absolute time information when each path of video source signals is coded;
sending each path of low-code-stream video signal to a broadcast guiding client so that the broadcast guiding client aligns each path of low-code-stream video signal according to an absolute timestamp of the low-code-stream video signal and outputs a low-code-stream program signal to a cloud broadcast guiding server according to a received broadcast guiding instruction;
and sending each path of high-code stream signal to a cloud broadcasting guide server so that the cloud broadcasting guide server aligns each path of high-code stream video signal according to an absolute timestamp of the high-code stream video signal, and acquiring a high-code stream program signal corresponding to the absolute timestamp from the high-code stream video signal according to an absolute timestamp corresponding to a low-code stream program signal sent by a broadcasting guide client.
2. The multi-machine synchronous cloud director method according to claim 1, wherein the absolute time information is obtained by:
judging whether GPS absolute time information is received or not;
when the GPS absolute time information is received, respectively inputting the high-code-stream video signal and the low-code-stream video signal into a GPS absolute timestamp according to the GPS absolute time information;
and when the GPS absolute time information is not received, acquiring network absolute time information so as to respectively input network absolute timestamps for the high-code-stream video signal and the low-code-stream video signal according to the network absolute time information.
3. The multi-machine synchronous cloud director method according to claim 1, further comprising:
receiving a camera control signal sent by the broadcast guiding client;
and controlling the corresponding camera to move according to the camera control signal.
4. The multi-machine synchronous cloud director method according to claim 1, further comprising:
receiving a Tally control instruction sent by the director client;
and controlling a Tally indicating lamp of the corresponding camera to send out an indication according to the Tally control instruction.
5. A computer-readable storage medium having stored thereon a multi-machine synchronous cloud director program that, when executed by a processor, implements the multi-machine synchronous cloud director method as recited in any one of claims 1-4.
6. A video encoder comprising a memory, a processor, and a multi-bit synchronized cloud director program stored on the memory and executable on the processor, wherein the processor, when executing the multi-bit synchronized cloud director program, implements the multi-bit synchronized cloud director method as recited in any one of claims 1-4.
7. A multi-machine synchronous cloud director system is characterized by comprising:
the system comprises a plurality of video encoders, a plurality of video encoder and a plurality of video decoder, wherein each video encoder is used for receiving a video source signal, and when each video encoder encodes the video source signal, an absolute timestamp is added into a high-code-stream video signal and a low-code-stream video signal obtained by encoding according to acquired absolute time information;
the broadcast guide client is respectively connected with each video encoder and used for receiving each path of low-code-stream video signal, aligning each path of low-code-stream video signal according to an absolute timestamp of the low-code-stream video signal and outputting a low-code-stream program signal according to a received switch instruction;
the cloud broadcasting guide server is respectively connected with the broadcasting guide client and each video encoder, and is used for receiving high-code-stream video signals sent by each video encoder, aligning each high-code-stream video signal according to an absolute timestamp of the high-code-stream video signals, and acquiring high-code-stream program signals corresponding to the absolute timestamp from the high-code-stream video signals according to the absolute timestamp corresponding to low-code-stream program signals output by the broadcasting guide client.
8. The multi-machine synchronized cloud director system of claim 7, wherein each of said video encoders comprises:
the absolute time acquisition module is used for acquiring absolute time information;
the high code stream coding module is connected with the absolute time acquisition module and is used for coding the received video source signal into a high code stream video signal and adding a timestamp into the high code stream video signal according to the absolute time information received by the absolute time acquisition module;
and the low code stream coding module is connected with the absolute time acquisition module and is used for coding the received video source signal into a low code stream video signal and adding a timestamp into the low code stream video signal according to the absolute time information received by the absolute time acquisition module.
9. The multi-machine synchronous cloud director system according to claim 8, wherein the absolute time acquisition module comprises a GPS time acquisition unit and a network time acquisition unit, wherein the GPS time acquisition unit is configured to acquire GPS absolute time information, and the network time acquisition unit is configured to acquire network absolute time information.
10. The multi-machine synchronous cloud director system according to claim 9, wherein the GPS time acquisition unit is connected to the high code stream coding module and the low code stream coding module, respectively, and when the GPS time acquisition unit acquires the GPS absolute time information, the high code stream coding module and the low code stream coding module respectively inject GPS absolute time stamps into the high code stream video signal and the low code stream video signal according to the GPS absolute time information;
the network time obtaining unit is respectively connected with the high code stream coding module and the low code stream coding module, and when the GPS time obtaining unit does not obtain the GPS absolute time information, the high code stream coding module and the low code stream coding module respectively inject the high code stream video signal and the low code stream video signal into a network absolute timestamp according to the network absolute time information.
11. The multi-position synchronized cloud director system according to claim 7, further comprising a plurality of cameras, each of said cameras being associated with a respective one of said video encoders;
each video encoder further comprises an interaction module, the interaction module is connected with the director client, and the interaction module is used for receiving a camera control signal sent by the director client and controlling the corresponding camera to move according to the camera control signal.
12. The multi-machine-position synchronous cloud broadcasting system according to claim 11, wherein each of the video encoders further includes a Tally module, the Tally module is connected to the broadcasting client, and the Tally module is configured to receive a Tally control instruction sent by the broadcasting client;
each camera further comprises a Tally indicator light, each Tally indicator light is correspondingly connected with each Tally module, and the Tally indicator light is used for giving out an indication under the action of the Tally control instruction.
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