CN105430529A - Video data transmission method and system - Google Patents
Video data transmission method and system Download PDFInfo
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- CN105430529A CN105430529A CN201510836416.1A CN201510836416A CN105430529A CN 105430529 A CN105430529 A CN 105430529A CN 201510836416 A CN201510836416 A CN 201510836416A CN 105430529 A CN105430529 A CN 105430529A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/64—Addressing
- H04N21/6405—Multicasting
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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
- H04N21/25—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
- H04N21/26616—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 for merging a unicast channel into a multicast channel, e.g. in a VOD application, when a client served by unicast channel catches up a multicast channel to save bandwidth
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a video data transmission method and a video data transmission system, for solving the problem that video teaching is prone to occurring network congestion in the prior art. The method comprises the steps of receiving a video data playing request, in response to the video data playing request, obtaining video data collected by a video collection device, determining a multicast address and a multicast port, and transmitting the collected video data in a multicast mode through the multicast address and the multicast port to allow an end station to receive the video data through the multicast address and the multicast port. Compared with the traditional unicast mode, the multicast mode can save more bandwidth, and thereby improves transmission smoothness of the video data.
Description
Technical field
The application relates to communication technical field, particularly relates to a kind of video data transmitting method and system.
Background technology
Long-distance education is the network platform of two-way mutual, (English: VerySmallApertureTerminal based on very small aperture terminal, be called for short VSAT) communicating provides video interactive to learn to remote districts, solve the remote teaching problem that local terrestrial network does not cover area, improve local level of education.Long-distance educational system for user provide live, recorded broadcast, program request and two-wayly add the service of protecting.VSAT communication system can be long-distance education and provides 4Mbps satellite communication bandwidth, for 10 VSAT end station access long-distance education websites, carries out remote teaching.For video teaching, every road video bandwidth takies higher, easily occurs the problem of network congestion.
Summary of the invention
Embodiments provide a kind of video data transmitting method and system, easily occur the problem of network congestion in order to solve video teaching in prior art.
Its concrete technical scheme is as follows:
A kind of video data transmitting method, described method comprises:
Receiving video data playing request;
Respond described video data playing request, obtain the video data collected by video acquisition device;
Determine multicast address and multicast port, and by described multicast address and multicast port, the described video data collected is carried out multicast transmission, receive described video data to make end station by described multicast address and described multicast port.
Optionally, receiving video data playing request, comprising:
Add up the rate of discharge of current output;
Judge whether described rate of discharge is greater than predetermined threshold value;
If when described rate of discharge is greater than described predetermined threshold value, then according to end station priority, the sequence of priority sequencing is carried out to the video data playing request received;
The described video data playing request of described response, is obtained the video data collected by video acquisition device, is specially:
Respond described video data playing request according to the priority orders of video data playing request, and obtain the video data collected by video acquisition device.
Optionally, the described video data playing request of described response, is obtained the video data collected by video acquisition device, is specially:
When there is the video data playing request of equal priority, determine the request time of the video data playing request of equal priority;
According to the sequencing response video data playing request of request time.
Optionally, respond described video data playing request according to the priority orders of described video data playing request, and obtain the video data collected by video acquisition device, comprising:
Transfer default queuing time, wherein, described queuing time characterizes the wait-for-response time of video data playing request;
Judge whether the wait-for-response time of video data playing request exceedes described queuing time;
If during the wait-for-response time of described video data playing request non-queuing time, then respond described video data playing request, and obtain the video data collected by video acquisition device.
Optionally, by described multicast address and multicast port, the video data collected is carried out multicast transmission, comprising:
Encoded to the coding video data collected by constant bit rate CBR;
Video data after coding is carried out multicast transmission by multicast address and multicast port.
A kind of video data sends system, comprising:
Receiver module, for receiving video data playing request;
Respond module, for responding described video data playing request, obtains the video data collected by video acquisition device;
Processing module, for determining multicast address and multicast port, and by described multicast address and multicast port, the described video data collected is carried out multicast transmission, receive described video data to make end station by described multicast address and described multicast port.
Optionally, described receiver module, specifically for adding up the rate of discharge of current output; Judge whether described rate of discharge is greater than predetermined threshold value; If when described rate of discharge is greater than described predetermined threshold value, then according to end station priority, the sequence of priority sequencing is carried out to the video data playing request received;
Described respond module, specifically for responding described video data playing request according to the priority orders of video data playing request, and obtains the video data collected by video acquisition device.
Optionally, described respond module, specifically for when there is the video data playing request of equal priority, determines the request time of the video data playing request of equal priority; According to the sequencing response video data playing request of request time.
Optionally, described respond module, specifically for transferring default queuing time, wherein, described queuing time characterizes the wait-for-response time of video data playing request; Judge whether the wait-for-response time of video data playing request exceedes described queuing time; If during the wait-for-response time of described video data playing request non-queuing time, then respond described video data playing request, and obtain the video data collected by video acquisition device.
Optionally, described processing module, specifically for encoding to the coding video data collected by constant bit rate CBR; Video data after coding is carried out multicast transmission by multicast address and multicast port.
The invention provides a kind of video data transmitting method, the problem of network congestion is easily there is for solving video teaching in prior art, the method comprises: receiving video data is play please, response video data playing request, obtain the video data collected by video acquisition device, determine multicast address and multicast port, and by this multicast address and multicast port, the video data collected is carried out multicast transmission, to make end station by multicast address and multicast port receiving video data.More bandwidth can be saved by the mode of multicast compared to traditional mode of unicast, thus improve the smoothness of video data propagation.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of data transmission method for uplink in the embodiment of the present invention;
Fig. 2 is the structural representation of a kind of data Transmission system in the embodiment of the present invention.
Embodiment
Embodiments provide a kind of video data transmitting method and system, the problem of network congestion is easily there is for solving video teaching in prior art, the method comprises: receiving video data is play please, response video data playing request, obtain the video data collected by video acquisition device, determine multicast address and multicast port, and by this multicast address and multicast port, the video data collected is carried out multicast transmission, to make end station by multicast address and multicast port receiving video data.More bandwidth can be saved by the mode of multicast compared to traditional mode of unicast, thus improve the smoothness of video data propagation.
Below by accompanying drawing and specific embodiment, technical solution of the present invention is described in detail, be to be understood that, the explanation of concrete technical characteristic in the embodiment of the present invention and embodiment just to technical solution of the present invention, instead of limit, when not conflicting, the concrete technical characteristic in the embodiment of the present invention and embodiment can combine mutually.
Be illustrated in figure 1 the flow chart of a kind of video data transmitting method in the embodiment of the present invention, the method comprises:
S101, receiving video data playing request;
S102, response video data playing request, obtains the video data collected by video acquisition device;
S103, determines multicast address and multicast port, and by multicast address and multicast port, the video data collected is carried out multicast transmission.
Specifically, before performing above-mentioned method, need setting multicast address and multicast port, multicast address and multicast port can be arranged in long-distance educational system, and this multicast address and multicast port need to arrange with VSAT, that is, can ensure that VSAT can receive the video data of long-distance educational system multicast by agreement multicast port and multicast address.
After appointing multicast address and multicast port, if when receiving the video data playing request of VSAT transmission, system is by this video data playing request of response, and obtain the video data collected by video acquisition unit, then system is (English: RealTimeMediaFlowProtocol by implementing media stream protocol by video data, RTMFP) and carry out multicast by the multicast address appointed and multicast port be called for short:, then gone out by satellite multicast by VSAT communication system, last in end station, that is: VSAT end front end page Flash player in receiving group video data.
Effectively can lower bandwidth by above-mentioned multicast mode, thus ensure the stability of long-range video data transmission.
Specifically, suppose that 1 road video bandwidth is 512kbps, when so single group and multicast, bandwidth occupancy situation is respectively:
Clean culture: 512kbps*5=2.5Mbps;
Multicast: 512kbps*1=512kbps;
Significantly can illustrate that bandwidth shared by multicast is much smaller than the bandwidth shared by clean culture by above-mentioned citing, so so the method for the multicasting video data the provided reduction bandwidth that can go up largely in the embodiment of the present invention, thus ensure the stability of video data transmission.
Further, in embodiments of the present invention, system can be real-time the rate of discharge of the current output of statistics, judge whether rate of discharge is greater than predetermined threshold value, if when rate of discharge is greater than predetermined threshold value, then according to end station priority, the sequence of priority sequencing is carried out to the video data playing request received, and respond video data playing request according to the priority orders of video data playing request, and acquisition collects video data by video acquisition device.
Specifically, be first the threshold value that will arrange present satellites communication link, the flow of then statistical server outlet, when the flow of server outlet reaches threshold value, then system starts to carry out Priority Control Strategies.Concrete strategy is as follows:
The priority of end station 1-5 is respectively a, b, c, d, e level, the grade of a-e reduces gradually, when end station 1 and end station 5 all have sent video data playing request to system, the system just video data playing request of end station 1 makes number one and processes, and the video data playing request of end station 5 is then placed on second and processes.
Certainly, also there is a kind of situation is the video data playing request that there is equal priority, now system will determine the request time of the video data playing request of equal priority, according to the sequencing response video data playing request of request time, such as, end station 1 is identical with the priority level of end station 2, if end station 2 sends video data playing request prior to end station 1 to system, then system is by the video data playing request of preferential answering end station 1.
Further, in embodiments of the present invention, in system except the priority that end station is set, system also arranges queuing time, this queuing time characterizes the wait-for-response time of video data playing request, after system to sort to video data playing request according to priority, system also will judge whether the wait-for-response time of video data playing request exceedes queuing time, if the stand-by period of video data playing request is not when exceeding queuing time, response video data playing request, and obtain the video data collected by video acquisition device; If the stand-by period of video data playing request is when exceeding queuing time, then by the break link of end station and system, again send video data playing request to system to make end station.
The Priority Control Strategies of system for example bright below:
First threshold value and the period of reservation of number of present satellites communication link are set;
Secondly at the flow of asking statistical server outlet in video data process end station user;
When the flow exported reaches threshold value, system will start Priority Control Strategies, and specific strategy is as follows:
The priority of end station 1-5 arranges a, b, c, d, e respectively, and each queuing time of video data playing request is 5s;
When end station 1 and 4 sends video data playing request simultaneously, system judges that end station 1 is as the high end station of priority, and the video data playing request of end station 1 is placed above the other things by system;
If in 5s after the release of system bandwidth resource, end station 1 priority access system; If system bandwidth resource does not discharge in 5s, namely current bandwidth uses and still exceedes threshold value, then end station 1 and end station 4 link and disconnect, and need again to ask;
When end station 2 and end station 3 requesting party digital video resource, system judges that end station 2 and end station 3 are as same priority end station, then rank according to the time sequencing of end station 2 and end station 3;
If in 5s after the release of system bandwidth resource, first ask the end station connecting system of video resource, the end station of rear request continues to wait for resource, same wait until 5s time, link disconnects, and needs again again to ask;
By that analogy, by this priority queuing, control access and the access order of end station, ensure the stable operation of current system.
Be described priority policy of the present invention below by concrete form, wherein, table 1 is the test result not using Priority Control Strategies to arrange, and table 2 is the test result using Priority Control Strategies to arrange, specific as follows:
Table 1
Clearly, when not using Priority Control Strategies in Table 1, video please the response time long, when end station 10 asks order video, have 2 road videos to occur stuck phenomenon in 10 road videos, the experience that this results in user is poor.
Table 2
Clearly, when employing Priority Control Strategies, can protect current system user, in fixed-bandwidth situation, guarantee the stable operation of system.
Further, in embodiments of the present invention, stability during in order to ensure the stability of video data transmission and receive, can be encoded to the coding video data collected by constant bit rate CBR, the video data after coding is carried out multicast transmission by multicast address and multicast port.
Specifically, in video display process, bit rate when there is object of which movement is higher than bit rate during object rest, and motion is fiercer, and bit rate is larger.Constant bit rate is (English: ConstantsBitRate, be called for short: relative variable bit rate of CBR) encoding is (English: VariableBitRate, be called for short: VBR) encode, when using CBR coding, bit rate is basic in the traveling process of video flowing keeps constant and close to target bit rate, all the time be in the time window determined by buffer size, larger rate fluctuation can not be produced.CBR coding techniques is highly suitable for the channel of a Bandwidth-Constrained, this feature makes CBR coding techniques when being applied to based on satellite transmission, the bandwidth that transmission of video takies is in comparatively stable level, avoids occurring that the bit rate satellite bandwidth brought more greatly that fluctuates uses the too much network congestion caused.
In long-distance educational system, ffmpeg Video Codec is adopted to encapsulate, with the form of graphical interfaces, user is presented, select the speed of video file coding, former video file is encoded to the file of fixed code speed, transmit in satellite link, avoid the network congestion risk that bit rate peak value brings.
To sum up, in embodiments of the present invention, system acceptance video data is play please, response video data playing request, obtain the video data collected by video acquisition device, determine multicast address and multicast port, and by this multicast address and multicast port, the video data collected is carried out multicast transmission, to make end station by multicast address and multicast port receiving video data.More bandwidth can be saved by the mode of multicast compared to traditional mode of unicast, thus improve the smoothness of video data propagation.
A kind of video data transmitting method in the corresponding embodiment of the present invention, additionally provides a kind of video data and sends system in the embodiment of the present invention, be illustrated in figure 2 a kind of video data in the embodiment of the present invention and send the structural representation of system, this system comprises:
Receiver module 201, for receiving video data playing request;
Respond module 202, for responding described video data playing request, obtains the video data collected by video acquisition device;
Processing module 203, for determining multicast address and multicast port, and by described multicast address and multicast port, the described video data collected is carried out multicast transmission, receive described video data to make end station by described multicast address and described multicast port.
Further, in embodiments of the present invention, described receiver module 201, specifically for adding up the rate of discharge of current output; Judge whether described rate of discharge is greater than predetermined threshold value; If when described rate of discharge is greater than described predetermined threshold value, then according to end station priority, the sequence of priority sequencing is carried out to the video data playing request received;
Described respond module 202, specifically for responding described video data playing request according to the priority orders of video data playing request, and obtains the video data collected by video acquisition device.
Further, in embodiments of the present invention, described respond module 202, specifically for when there is the video data playing request of equal priority, determines the request time of the video data playing request of equal priority; According to the sequencing response video data playing request of request time.
Further, in embodiments of the present invention, described respond module 202, specifically for transferring default queuing time, wherein, described queuing time characterizes the wait-for-response time of video data playing request; Judge whether the wait-for-response time of video data playing request exceedes described queuing time; If during the wait-for-response time of described video data playing request non-queuing time, then respond described video data playing request, and obtain the video data collected by video acquisition device.
Further, in embodiments of the present invention, described processing module 203, specifically for encoding to the coding video data collected by constant bit rate CBR; Video data after coding is carried out multicast transmission by multicast address and multicast port.
Although described the preferred embodiment of the application, one of ordinary skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the application's scope.
Obviously, those skilled in the art can carry out various change and modification to the application and not depart from the spirit and scope of the application.Like this, if these amendments of the application and modification belong within the scope of the application's claim and equivalent technologies thereof, then the application is also intended to comprise these change and modification.
Claims (10)
1. a video data transmitting method, is characterized in that, described method comprises:
Receiving video data playing request;
Respond described video data playing request, obtain the video data collected by video acquisition device;
Determine multicast address and multicast port, and by described multicast address and multicast port, the described video data collected is carried out multicast transmission, receive described video data to make end station by described multicast address and described multicast port.
2. the method for claim 1, is characterized in that, receiving video data playing request, comprising:
Add up the rate of discharge of current output;
Judge whether described rate of discharge is greater than predetermined threshold value;
If when described rate of discharge is greater than described predetermined threshold value, then according to end station priority, the sequence of priority sequencing is carried out to the video data playing request received;
The described video data playing request of described response, is obtained the video data collected by video acquisition device, is specially:
Respond described video data playing request according to the priority orders of video data playing request, and obtain the video data collected by video acquisition device.
3. method as claimed in claim 2, it is characterized in that, the described video data playing request of described response, is obtained the video data collected by video acquisition device, is specially:
When there is the video data playing request of equal priority, determine the request time of the video data playing request of equal priority;
According to the sequencing response video data playing request of request time.
4. method as claimed in claim 2, is characterized in that, respond described video data playing request according to the priority orders of described video data playing request, and obtains the video data collected by video acquisition device, comprising:
Transfer default queuing time, wherein, described queuing time characterizes the wait-for-response time of video data playing request;
Judge whether the wait-for-response time of video data playing request exceedes described queuing time;
If during the wait-for-response time of described video data playing request non-queuing time, then respond described video data playing request, and obtain the video data collected by video acquisition device.
5. the method for claim 1, is characterized in that, by described multicast address and multicast port, the video data collected is carried out multicast transmission, comprising:
Encoded to the coding video data collected by constant bit rate CBR;
Video data after coding is carried out multicast transmission by multicast address and multicast port.
6. video data sends a system, it is characterized in that, comprising:
Receiver module, for receiving video data playing request;
Respond module, for responding described video data playing request, obtains the video data collected by video acquisition device;
Processing module, for determining multicast address and multicast port, and by described multicast address and multicast port, the described video data collected is carried out multicast transmission, receive described video data to make end station by described multicast address and described multicast port.
7. system as claimed in claim 6, is characterized in that, described receiver module, specifically for adding up the rate of discharge of current output; Judge whether described rate of discharge is greater than predetermined threshold value; If when described rate of discharge is greater than described predetermined threshold value, then according to end station priority, the sequence of priority sequencing is carried out to the video data playing request received;
Described respond module, specifically for responding described video data playing request according to the priority orders of video data playing request, and obtains the video data collected by video acquisition device.
8. system as claimed in claim 7, is characterized in that, described respond module, specifically for when there is the video data playing request of equal priority, determining the request time of the video data playing request of equal priority; According to the sequencing response video data playing request of request time.
9. system as claimed in claim 7, it is characterized in that, described respond module, specifically for transferring default queuing time, wherein, described queuing time characterizes the wait-for-response time of video data playing request; Judge whether the wait-for-response time of video data playing request exceedes described queuing time; If during the wait-for-response time of described video data playing request non-queuing time, then respond described video data playing request, and obtain the video data collected by video acquisition device.
10. system as claimed in claim 6, is characterized in that, described processing module, specifically for being encoded to the coding video data collected by constant bit rate CBR; Video data after coding is carried out multicast transmission by multicast address and multicast port.
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| US11570501B2 (en) | 2018-05-29 | 2023-01-31 | Beijing Bytedance Network Technology Co., Ltd. | Connection allocation method in media playing process, media playing device and storage medium |
| CN112153419A (en) * | 2019-06-28 | 2020-12-29 | 北京字节跳动网络技术有限公司 | Network resource configuration adjusting method, device, server and storage medium |
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