CN103139660B - The distribution of services method for detecting abnormal of a kind of live video distribution and device - Google Patents
The distribution of services method for detecting abnormal of a kind of live video distribution and device Download PDFInfo
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Abstract
The present invention relates to Information & Communication Technology field, be specifically related to distribution of services method for detecting abnormal and the device of a kind of live video distribution.In order to automatically detect the live media stream distribution state of all video live broadcast service in live video distribution, find the abnormal phenomena during the live media stream distribution of video live broadcast service in time, the present invention proposes distribution of services method for detecting abnormal and the device of a kind of live video distribution, the video live broadcast service Media Stream Distribution status of carrying in live video distribution is obtained by the central business detection device being embedded in video distribution network global server and the node traffic detection device being embedded in video distribution network node server, find the live media stream distribution abnormal conditions of video live broadcast service in time.
Description
Technical field
The present invention relates to communication network, particularly relate to a kind of live video distribution in live video distribution
Distribution of services method for detecting abnormal and device.
Background technology
Along with the extensive application of video technique, the demand of net cast based on Internet service increases day by day, and base
Extensive video flow in Internet is distributed becomes the severe challenge that net cast service is faced.Although CDN skill
Art is widely used in distributing web traffic and video request program flow, it is achieved the access nearby of Web content, alleviates streaming media
High-throughput pressure that backbone bandwidth is brought, improve service response speed, but CDN technology can't solve well at present
The certainly traffic distribution problem of extensive video live broadcast service.
As it is shown in figure 1, service for extensive net cast, can be by disposing by live source tiny node server set
The video distribution network node server clusters such as group, relay node services device cluster and edge node server cluster are formed
Live video distribution improves the efficiency of service of extensive video live broadcast service, reduces shared by net cast service transmission
The network bandwidth.
Height collection for the live video distribution shown in Fig. 1, to the server cluster that a large amount of dispersions are disposed
Middle management and control are to ensure that the necessary means of network efficiency, reliability, controllability.Video distribution network global server is permissible
Regard one group of logical device as, it is achieved that the management of live video distribution, monitoring, dynamically configure, control, the merit such as scheduling
Can, all video distribution network node server in live video distribution are carried out centralized Control, manage and dispatch.
One live video distribution can carry the live media stream distribution work of multitude of video live broadcast service simultaneously,
From live source, the live media stream of video live broadcast service is distributed to request receive the subscription client of this business.Carrying video
The feelings such as the video distribution network node server exception of the live media stream distribution work of live broadcast service or transmission network exception
Condition all can cause the abnormal conditions that the live media stream distribution of video live broadcast service works.Now, artificial by webmaster personnel
Monitoring and judgement often at the live media stream distribution abnormal phenomena of very first time discovery video live broadcast service, thus cannot affect
Exception response speed.
Summary of the invention
In order to solve the leftover problem of prior art, remedy technology is blank, and the present invention proposes in Video Distribution Network
The distribution of services method for detecting abnormal of a kind of live video distribution and device, thus automatically detect live video distribution
The live media stream distribution state of interior all video live broadcast service, finds in video live broadcast service Media Stream distribution procedure in time
Abnormal phenomena.
According to the first aspect of the invention, it is provided that the distribution of services abnormality detection side of a kind of live video distribution
Method, it is characterised in that:
A) when starting the live media stream distribution work of a video live broadcast service in live video distribution, video
Distribution network global server is that it starts a central business detection device, is responsible for following the tracks of detecting described video live broadcast service
Net distribution state；
B) when video distribution network node server receives the startup request of a video live broadcast service, video distribution
Network-node server is that it starts a node traffic detection device, and responsible tracking reports the network of described video live broadcast service
Distribution status change information；
C) each central business detection device being embedded in video distribution network global server is straight by performing video
Broadcast business network distribution abnormality detection process and video live broadcast service net distribution state detection process is divided to obtain net cast
The net distribution status information of each video live broadcast service of carrying in hairnet network, finds the live matchmaker of video live broadcast service in time
Body stream abnormal conditions during net distribution.
According to the second aspect of the invention, it is provided that a kind of central business detection device.Central business detection plant running
In video distribution network global server, the node traffic being embedded in video distribution network node server by control is visited
Survey device, follow the tracks of the live media stream detecting designated live broadcast service abnormality during net distribution.Central authorities' industry
Business detection device includes: the first acquisition device, the first dispensing device, business detecting and controlling unit.Wherein: the first acquisition device
For receiving the information from node traffic detection device；First dispensing device is used for sending information to node traffic detection dress
Put；Business detecting and controlling unit is responsible for detecting alarm notification message and industry according to the service exception from node traffic detection device
It is different that business state detection notification message finds that the live media stream of video live broadcast service is distributed in live video distribution
Often state.
According to the third aspect of the invention we, it is provided that a kind of node traffic detection device.Node traffic detection plant running
In video distribution network node server, it is responsible for following the tracks of the live media stream of detection designated live broadcast service in video distribution
Distribution status in network-node server and exception.Node traffic detection device includes: the second acquisition device, the second transmission
Device, service tracking apparatus, service exception detection device.Wherein: the second acquisition device detects from central business for obtaining
The information of device；Second dispensing device is used for sending information to central business detection device；Service tracking apparatus is responsible for following the tracks of prison
The live media stream of control designated live broadcast service Distribution status in video distribution network node server；Service exception is visited
Survey device is responsible for the Distribution status of the live media stream according to designated live broadcast service and is found distribution of services abnormality also
To central business detection device report.
According to the fourth aspect of the invention, it is provided that video live broadcast service net distribution abnormality detection process.Wherein, including
Following steps:
A) node traffic in video distribution network node server detection device real-time collecting its be responsible for monitor regard
Frequently the live media stream distribution state of live broadcast service, receives state, live media stream forwarding state, straight including: live media stream
Broadcast Media Stream flow, live media stream packet loss etc.；
B) node traffic detection device finds that the live media stream distribution state being responsible for the video live broadcast service of monitoring goes out
Now during exception, such as: the Traffic Anomaly of live media stream, the packet loss of live media stream exceed alarm threshold etc., node traffic is visited
Survey device and generate service exception detection alarm notification message, message is carried the abnormal information detected；
C) node traffic detection device sends service exception detection alarm notification message and detects device to central business；
D), after central business detection device receives service exception detection alarm notification message, send service exception detection and accuse
Alert response message detects device to node traffic.
According to the fifth aspect of the invention, it is provided that video live broadcast service net distribution state detection process.Wherein, including
Following steps:
A) the node traffic detection in video distribution network node server is responsible for the net cast of monitoring
The live media stream distribution state of business；
B) node traffic detection is to the live media stream distribution state of the video live broadcast service being responsible for monitoring
When changing (such as: never receive state to reception state, from reception state to do not receive state, etc.), generation business is divided
Sending out state detection notification message, the live media stream distribution state carrying monitored video live broadcast service in message changes
Information；
C) node traffic detection device sends distribution of services state detection notification message and detects device to central business；
D), after central business detection device receives distribution of services state detection notification message, send distribution of services state and visit
Survey response message and detect device to node traffic.
According to the sixth aspect of the invention, it is provided that video live broadcast service net distribution abnormality detection terminal procedure.Wherein,
Comprise the steps:
A) video distribution network global server receives a video live broadcast service termination message；
B) video distribution network global server closes the live media stream distribution being responsible for described video live broadcast service on it
The central business detection device of state detection；
C) video distribution network global server sends live broadcast service termination request message to responsible described net cast industry
All video distribution network node server of business distribution；
D) video distribution network node server receiving live broadcast service termination request message is closed on it responsible described
The node traffic detection device of the live media stream distribution state detection of video live broadcast service.
Using the solution of the present invention, video distribution network global server can detect in live video distribution automatically
The live media stream distribution state of all video live broadcast service, find that the live media stream of video live broadcast service is at network in time
Abnormal phenomena in distribution procedure.
Accompanying drawing explanation
Reading the following detailed description to non-limiting example by referring to accompanying drawing, other of the present invention is special
Levy, purpose and advantage will become more apparent upon.The schematic description and description of the present invention is used for explaining the present invention, not structure
Become inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the system structure schematic diagram of live video distribution；
Fig. 2 shows the structural representation of the central business detection device of a specific embodiment according to the present invention；
Fig. 3 shows the structural representation of the node traffic detection device of a specific embodiment according to the present invention；
Fig. 4 shows the video live broadcast service net distribution abnormality detection process of a specific embodiment according to the present invention
Flow chart；
Fig. 5 shows the video live broadcast service net distribution state detection process of a specific embodiment according to the present invention
Flow chart；
Fig. 6 shows that the video live broadcast service net distribution abnormality detection of a specific embodiment according to the present invention terminates
The flow chart of process.
Wherein, same or analogous reference represents same or analogous steps characteristic or device/module.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the preferred embodiment of the present invention is described in detail.
As a example by the live video distribution shown in Fig. 1, when video live broadcast service x starts, global server 1 is
Video live broadcast service x creates central business detection device, i.e. a central business detection device x, is responsible for following the tracks of detection video straight
Broadcast the live media stream of the business x real-time Distribution status in live video distribution.Assume live source tiny node server
It is straight that J11, relay node services device J21, edge node server J31, edge node server J33 are allocated for being responsible for video
Broadcasting the live media stream distribution work of business x, when video live broadcast service x starts, global server 1 can send net cast industry
Business x starts the request message Video Distribution Network node to the live media stream distribution work of all responsible video live broadcast service x
Server, including: live source tiny node server J11, relay node services device J21, edge node server J31, edge save
Point server J33.As a example by edge node server J31, when edge node server J31 receives from global server 1
Video live broadcast service x start request message time, edge node server J31 be video live broadcast service x create a node industry
Business detection device, responsible tracking reports the live media stream of video live broadcast service x distribution shape in edge node server J31
State change information, such as: the live media stream inflow edge node server J31 of video live broadcast service x, video live broadcast service x
Live media stream is forwarded to certain user's terminal, etc..Central business detection device x in global server 1 is by embedding
In live source tiny node server J11, relay node services device J21, edge node server J31, edge node server J33
In node traffic detection device, can know that the live media stream of video live broadcast service x is in live video distribution in time
Interior real-time Distribution status, detects the exception during net distribution.
Hereinafter, being described a second aspect of the present invention according to Fig. 2, wherein, Fig. 1 and associated description thereof are made in this together
For reference.
As a example by the live video distribution shown in Fig. 1, central business detection plant running is in global server 1
In, the node traffic detection device being embedded in video distribution network node server by control, follow the tracks of detection designated
The live media stream of live broadcast service abnormality during net distribution.Central business detection device includes: first obtains
Fetching puts the 101, first dispensing device 102, business detecting and controlling unit 103.Wherein:
First acquisition device 101, for receiving the information from node traffic detection device, and submits to business detection control
Device 103 processed.As: the first acquisition device 101 receives the service exception detection alarm notification from node traffic detection device
After message and service condition detection notification message, described message is submitted to business detecting and controlling unit 103 and processes.
First dispensing device 102, for being sent to node traffic detection by the information that business detecting and controlling unit 103 is submitted to
Device.
Business detecting and controlling unit 103, is responsible for according to the service exception detection alarm from node traffic detection device logical
Know that message and service condition detection notification message are to check that the live media stream of video live broadcast service is in live video distribution
In Distribution status, obtain abnormal state information.
Hereinafter, being described a third aspect of the present invention according to Fig. 3, wherein, Fig. 1 and associated description thereof are made in this together
For reference.
As a example by the live video distribution shown in Fig. 1, node traffic detection plant running is in Video Distribution Network
In node server, it is responsible for following the tracks of the live media stream of detection designated live broadcast service in video distribution network node server
In Distribution status and exception.Node traffic detection device includes: second acquisition device the 201, second dispensing device 202, industry
Device 203, service exception detection device 204 are followed the tracks of in business.Wherein:
Second acquisition device 201, for obtaining the information from central business detection device, and submits to service exception spy
Survey device 204.
Second dispensing device 202, for detecting, by service exception, the information that device 204 is submitted to, such as: service exception detection is accused
Alert notification message, service condition detection notification message, be sent to central business detection device.
Service tracking apparatus 203, is responsible for the live media stream following the tracks of designated live broadcast service and saves at Video Distribution Network
Distribution status in point server.
Service exception detection device 204, is responsible for the live matchmaker of the video live broadcast service obtained according to service tracking apparatus 203
Body stream distribution state finds described video live broadcast service Distribution status in this video distribution network node server in time
Change and abnormal information, and reported to central business detection device by the second dispensing device 202.
As a example by edge node server J31, when edge node server J31 receives regarding from global server 1
Frequently, when live broadcast service x starts request message, edge node server J31 is that video live broadcast service x creates a node traffic spy
Survey device, it may be assumed that node traffic detection device y.Service tracking apparatus 203 in node traffic detection device y is responsible for following the tracks of video
The live media stream of live broadcast service x Distribution status change information in edge node server J31, such as: video live broadcast service x
Live media stream inflow edge node server J31, the live media stream of video live broadcast service x is forwarded to certain user eventually
End, etc., and these change informations are submitted to service exception detection device 204.Service exception detection device 204 is according to business
The live media stream distribution status information following the tracks of the video live broadcast service that device 203 obtains finds video live broadcast service x in time
Distribution status change in edge node server J31 and abnormal information, and by the second dispensing device 202 to global service
Device 1 is responsible for the central business detection device report of the live media stream distribution state detection of video live broadcast service x.
Hereinafter, being described a fourth aspect of the present invention with reference to Fig. 4, wherein, Fig. 1, Fig. 2, Fig. 3 and associated description thereof exist
This is in the lump as reference.
As a example by the global server 1 shown in Fig. 1 and edge node server J31, when video live broadcast service x starts
After, global server 1 creates central business detection device x and visits to the live media stream distribution state being responsible for video live broadcast service x
Survey work.As being responsible for undertaking the video distribution network node server of the live media stream distribution task of video live broadcast service x
One of, after video live broadcast service x starts, edge node server J31 is that it creates a node traffic detection device, it may be assumed that
Node traffic detection device y, is responsible for the live media stream of real-time detection video live broadcast service x in edge node server J31
Distribution status.As a example by node traffic detection device y, video live broadcast service net distribution abnormality detection process includes walking as follows
Rapid:
Step S10, node traffic detects the straight of service tracking apparatus 203 real-time collecting video live broadcast service x in device y
Broadcast Media Stream Distribution status in edge node server J31, include: whether to receive the live matchmaker of video live broadcast service x
Body stream, forward the live media of video live broadcast service x to flow to how many subscription clients, video live broadcast service x that receives
Live media stream flow, etc..
Step S11, node traffic detection device y finds the live media flow point hair-like of video live broadcast service x monitored
State occurs abnormal, such as: the Traffic Anomaly of live media stream of video live broadcast service x, the live media stream of video live broadcast service x
Packet loss exceedes alarm threshold etc., and node traffic detection device y generates service exception detection alarm notification message, carries in message
The abnormal information detected.
Step S12, in node traffic detection device y transmission service exception detection alarm notification message to global server 1
It is responsible for the central business detection device x of video live broadcast service x abnormality detection.
Step S13, after central business detection device x receives service exception detection alarm notification message, sends business different
Often detection alarm response message detects device y to node traffic.
During the live media stream distribution of video live broadcast service x, it is responsible for undertaking the live media of video live broadcast service x
All video distribution network node server of stream distribution task all can create a node traffic detection for video live broadcast service x
Device, and perform above-mentioned video live broadcast service net distribution abnormality detection process.By described process, global server 1 will be real
Time to obtain the distribution on each associated video distribution network-node server of video live broadcast service x, transmission state abnormal, thus and
The live media stream of Shi Faxian video live broadcast service x abnormal phenomena in network transmission process.
Hereinafter, being described a fifth aspect of the present invention with reference to Fig. 5, wherein, Fig. 1, Fig. 2, Fig. 3 and associated description thereof exist
This is in the lump as reference.
As a example by the global server 1 shown in Fig. 1 and edge node server J31, when video live broadcast service x starts
After, global server 1 creates central business detection device x and visits to the live media stream distribution state being responsible for video live broadcast service x
Survey work.As being responsible for undertaking the video distribution network node server of the live media stream distribution task of video live broadcast service x
One of, after video live broadcast service x starts, edge node server J31 is that it creates a node traffic detection device, it may be assumed that
Node traffic detection device y, is responsible for the live media stream of real-time detection video live broadcast service x in edge node server J31
Distribution status.As a example by node traffic detection device y, video live broadcast service net distribution state detection process includes walking as follows
Rapid:
Step S20, node traffic detects the straight of service tracking apparatus 203 real-time collecting video live broadcast service x in device y
Broadcast Media Stream Distribution status in edge node server J31, and be submitted to the service exception in node traffic detection device y
Detection device 204.
Step S21, the service exception detection device 204 in node traffic detection device y finds the net of video live broadcast service x
When network Distribution status changes (such as: never receive state to reception state, from reception state to do not receive state, etc.),
Generate distribution of services state detection notification message, message is carried the live media stream distribution of monitored video live broadcast service x
State changes information.
Step S22, the service exception detection device 204 in node traffic detection device y is by the second dispensing device 202
Send distribution of services state detection notification message to the live media flow point hair-like of video live broadcast service x responsible in global server 1
The central business detection device x of state detection.
Step S23, after central business detection device x receives distribution of services state detection notification message, transmission business is divided
Hair-like state probe response message detects device y to node traffic.
During the live media stream distribution of video live broadcast service x, it is responsible for undertaking the live media of video live broadcast service x
All video distribution network node server of stream distribution task all can create a node traffic detection for video live broadcast service x
Device, and perform above-mentioned video live broadcast service net distribution abnormality detection process.By described process, global server 1 will be real
Time obtain the Distribution status change on each associated video distribution network-node server of video live broadcast service x, thus send out in time
The live media stream of existing video live broadcast service x abnormal phenomena in network transmission process.
Hereinafter, being described a sixth aspect of the present invention with reference to Fig. 6, wherein, Fig. 1, Fig. 2, Fig. 3 and associated description thereof exist
This is in the lump as reference.
As a example by the live video distribution shown in Fig. 1, when video live broadcast service x starts, global server 1 is
Video live broadcast service x creates central business detection device, i.e. a central business detection device x, is responsible for following the tracks of detection video straight
Broadcast the live media stream of the business x Distribution status in live video distribution.As being responsible for undertaking video live broadcast service x
One of video distribution network node server of live media stream distribution task, after video live broadcast service x starts, fringe node
Server J31 is that it creates a node traffic detection device, it may be assumed that node traffic detection device y, is responsible for real-time detection video straight
Broadcast the live media stream of the business x Distribution status in edge node server J31.With central business detection device x and node
As a example by business detection device y, video live broadcast service net distribution abnormality detection terminal procedure comprises the steps:
Step S30, global server 1 receives video live broadcast service x termination message, represents the straight of video live broadcast service x
The process of broadcasting terminates.
Step S31, global server 1 is closed in the live media stream distribution status monitoring being responsible for video live broadcast service x
Centre business detection device x.
Step S32, global server 1 sends live broadcast service and terminates request message to being responsible for the live of video live broadcast service x
All video distribution network node server of Media Stream distribution, such as: live source tiny node server J11, relay node services
Device J21, edge node server J31, edge node server J33, the termination message of notice video live broadcast service x.
Step S33, receives live broadcast service and terminates asking all video distribution network node server of message to close it
The node traffic detection device of the upper live media stream distribution state detection being responsible for video live broadcast service x.As: fringe node service
Device J31 closed node business detection device y, live source tiny node server J11, relay node services device J21, fringe node take
The node traffic of the live media stream distribution state detection that business device J33 etc. all can close responsible video live broadcast service x thereon is visited
Survey device.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (6)
1. the distribution of services method for detecting abnormal of a live video distribution, it is characterised in that: when net cast distribution networks
When starting the live media stream distribution work of a video live broadcast service in network, video distribution network global server is that it starts
One central business detection device, is responsible for following the tracks of the net distribution state detecting described video live broadcast service；When video distribution net
When network node server receives the startup request of a video live broadcast service, video distribution network node server is that it starts
One node traffic detection device, responsible tracking reports the net distribution state change information of described video live broadcast service；Embed
Each central business detection device in video distribution network global server is by performing video live broadcast service net distribution
Abnormality detection process and video live broadcast service net distribution state detection process obtain carrying in live video distribution
The net distribution status information of each video live broadcast service, finds that the live media stream of video live broadcast service is in net distribution in time
During abnormal conditions.
The distribution of services method for detecting abnormal of live video distribution the most according to claim 1, is further characterized in that,
Video live broadcast service net distribution abnormality detection process comprises the following steps:
A) its video being responsible for monitoring of the detection of the node traffic in video distribution network node server device real-time collecting is straight
Broadcast the live media stream distribution state of business, including: live media stream receives state, live media stream forwarding state, live matchmaker
Body stream flow and live media stream packet loss；
B) node traffic detection device finds when the live media stream distribution state of the video live broadcast service monitored occurs abnormal,
Node traffic detection device generates service exception detection alarm notification message, carries the abnormal information detected in message；
C) node traffic detection device sends service exception detection alarm notification message and detects device to central business；
D), after central business detection device receives service exception detection alarm notification message, send service exception detection alarm and ring
Message is answered to arrive node traffic detection device.
The distribution of services method for detecting abnormal of live video distribution the most according to claim 1 and 2, its feature also exists
In, video live broadcast service net distribution state detection process comprises the following steps:
A) video live broadcast service that the node traffic detection in video distribution network node server is monitored is straight
Broadcast Media Stream Distribution status；
B) node traffic detection changes to the live media stream distribution state of the video live broadcast service monitored
Time, generate distribution of services state detection notification message, message is carried the live media flow point of monitored video live broadcast service
Hair-like state changes information；
C) node traffic detection device sends distribution of services state detection notification message and detects device to central business；
D), after central business detection device receives distribution of services state detection notification message, send distribution of services state detection and ring
Message is answered to arrive node traffic detection device.
The distribution of services method for detecting abnormal of live video distribution the most according to claim 1, is further characterized in that,
Video live broadcast service net distribution abnormality detection terminal procedure comprises the following steps:
A) video distribution network global server receives a video live broadcast service termination message；
B) video distribution network global server closes the live media stream distribution state being responsible for described video live broadcast service on it
The central business detection device of detection；
C) video distribution network global server transmission live broadcast service terminates asking message to be divided to responsible described video live broadcast service
The all video distribution network node server sent out；
D) receive live broadcast service to terminate asking the video distribution network node server of message to close responsible described video on it
The node traffic detection device of the live media stream distribution state detection of live broadcast service.
5. a central business detection device, it is characterised in that: central business detection plant running is in the Video Distribution Network overall situation
In server, the node traffic detection device being embedded in video distribution network node server by control, follow the tracks of detection and refer to
Determine the live media stream of the video live broadcast service abnormality during net distribution；Central business detection device includes:
First acquisition device, the first dispensing device, business detecting and controlling unit；First acquisition device is visited from node traffic for receiving
Survey the information of device；First dispensing device is used for sending information to node traffic detection device；Business detecting and controlling unit is responsible for
Send out according to service exception detection alarm notification message and the service condition detection notification message from node traffic detection device
The abnormality that the live media stream of existing video live broadcast service is distributed in live video distribution.
6. a node traffic detection device, it is characterised in that node traffic detection plant running is in Video Distribution Network node
In server, it is responsible for following the tracks of the live media stream of detection designated live broadcast service in video distribution network node server
Distribution status and exception；Node traffic detection device include: the second acquisition device, the second dispensing device, service tracking apparatus,
Service exception detection device；Second acquisition device is for obtaining the information from central business detection device；Second dispensing device
For sending information to central business detection device；Service tracking apparatus is responsible for the live of tracing and monitoring designated live broadcast service
Media Stream Distribution status in video distribution network node server；Service exception detection device is responsible for according to designated straight
Broadcast the Distribution status of live media stream of business to find distribution of services abnormality and to central business detection device report.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110392476.0A CN103139660B (en) | 2011-12-01 | The distribution of services method for detecting abnormal of a kind of live video distribution and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110392476.0A CN103139660B (en) | 2011-12-01 | The distribution of services method for detecting abnormal of a kind of live video distribution and device |
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| Publication Number | Publication Date |
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| CN103139660A CN103139660A (en) | 2013-06-05 |
| CN103139660B true CN103139660B (en) | 2016-12-14 |
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