CN101867804A - Internet protocol television direct broadcast system and method - Google Patents
Internet protocol television direct broadcast system and method Download PDFInfo
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- CN101867804A CN101867804A CN201010189273A CN201010189273A CN101867804A CN 101867804 A CN101867804 A CN 101867804A CN 201010189273 A CN201010189273 A CN 201010189273A CN 201010189273 A CN201010189273 A CN 201010189273A CN 101867804 A CN101867804 A CN 101867804A
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Abstract
The invention relates to an internet protocol television direct broadcast system which comprises a central direct broadcast server, a border direct broadcast server and a user device. The central direct broadcast server is used for expanding a code stream of each channel to the code stream which can be broadcasted; the border direct broadcast server is used for acquiring the code stream which can be broadcasted of each channel from the central direct broadcast server and sending to a border multicast domain in the multicast way; and the user device is used for being added into the border multicast domain according to direct broadcast parameters and starting to receive the code stream which can be broadcasted of each channel sent from the border direct broadcast server in the multicast way. The invention further provides an internet protocol television direct broadcast method. The system and the method can solve the problems that the existing internet protocol television direct broadcast system and the method directly utilize a central stream media platform and a border stream media platform for undertaking forward and relay of the code stream of each channel, and the service quality is affected due to excessively high load of the central stream media platform and the border stream media platform.
Description
Technical field
(Internet Protocol television, IPTV) field relates in particular to internet protocol television direct broadcast system and method to the present invention relates to IPTV.
Background technology
Along with the raising of the network bandwidth and development of internet technology may for carrying out on existing network that multi-media value-added business provides.Stream media technology provide a kind of in network the mode of content of multimedia such as transmission of video, audio frequency, picture, so IPTV has obtained using widely.In present IPTV system, live broadcast service is important business, and need finish by the internet television live broadcast system.
In existing internet protocol television direct broadcast system shown in Figure 1, usually by live encoder server (Live Encode Server, LES), center steaming media platform (Center Streaming Server Platform, CSSP) and a plurality of marginal flow media platform (Local Streaming Server Platform, LSSP) form, live encoder server sends the code stream of each channel to the center steaming media platform in the multicast mode; Owing in metropolitan area network, can't carry out inter-network territory multicast, so, the marginal flow media platform can only be by after carrying out Signalling exchange with the center steaming media platform, obtain the code stream of each channel from the center steaming media platform with the clean culture trunking scheme, (User Equipment UE) sends the code stream of each channel to subscriber equipment with multicast mode then.
In existing internet protocol television direct broadcast system, the center steaming media platform is the service center of the whole network, not only send the code stream of each channel to the marginal flow media platform in the mode of clean culture, time-moving television (Time-Shift TV also is provided simultaneously, TSTV) record and video on demand (TV On-Demand, TVOD) recoding service and transcoding class business, above-mentioned service needed waste more system resources, therefore when the center steaming media platform when busy, can't guarantee to send to the continuity and the integrality of code stream of each channel of marginal flow media platform.In addition, when direct broadcast band rolled up, too much clean culture relaying also can influence the performance of center steaming media platform between marginal flow media platform and the center steaming media platform, influences the normal operation of other business.Equally, the marginal flow media platform is providing time-moving television to record and video on demand recoding service and transcoding class business, if the marginal flow media platform is busy, the code stream that then can cause the marginal flow media platform to send to each channel of subscriber equipment equally also can be delayed time and packet loss.
Above-mentioned situation all can cause center steaming media platform in the internet protocol television direct broadcast system and marginal flow media platform because load too high and the live quality of shadow.
Summary of the invention
Main purpose of the present invention is to provide a kind of internet protocol television direct broadcast system and method, avoids center steaming media platform in the internet protocol television direct broadcast system and marginal flow media platform because load too high and the live quality of shadow.
The invention provides a kind of internet protocol television direct broadcast system, comprise central direct broadcast server, edge direct broadcast server and subscriber equipment.Central direct broadcast server is used for the code stream of each channel is expanded into the code stream that can play; The edge direct broadcast server is used for obtaining from central direct broadcast server the code stream that can play of each channel, and sends to the edge multicast domain in the multicast mode; Subscriber equipment is used for adding the edge multicast domain according to live parameter, begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode.
Preferably, above-mentioned internet protocol television direct broadcast system also comprises live encoder server, is used for multicast mode the code stream of each channel being sent to central direct broadcast server.
Preferably, above-mentioned subscriber equipment also is used for obtaining from the marginal flow media platform session description file of each channel, and resolves this session description file, to obtain live parameter; And, begin to receive the code stream that to play of each channel that the edge direct broadcast server sends with multicast mode according to the live parameter of obtaining.
Preferably, above-mentioned central direct broadcast server, the code stream that also is used for each channel is expanded into after the code stream that can play, sends to the center multicast domain in the multicast mode.
Preferably, above-mentioned center steaming media platform also is used for: read and resolve the session description file of local each channel of preserving, obtain live parameter; Add the edge multicast domain according to the live parameter that is resolved to, begin to receive the code stream that to play of each channel that the edge direct broadcast server sends in the multicast mode; And the code stream that can play of each channel that will receive is stored and is recorded.
Preferably, the above-mentioned marginal flow media platform of stating also is used for: read and resolve the session description file of local each channel of preserving, obtain live parameter; Add multicast domain according to the live parameter that is resolved to, begin to receive the code stream that to play of each channel that the edge direct broadcast server sends in the multicast mode; And the code stream that can play of each channel that will receive is stored and is recorded.
The present invention also provides a kind of internet protocol television direct broadcast method, may further comprise the steps: central direct broadcast server is expanded into the code stream that can play with the code stream of each channel; The edge direct broadcast server obtains the code stream that can play of each channel from central direct broadcast server, and sends to the edge multicast domain in the multicast mode; Subscriber equipment adds the edge multicast domain according to live parameter, begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode.
Preferably, above-mentioned edge direct broadcast server obtains the code stream that can play of each channel from central direct broadcast server, and also comprises send to the step of edge multicast domain in the multicast mode before: live encoder server sends to central direct broadcast server with multicast mode with the code stream of each channel.
Preferably, above-mentioned subscriber equipment adds the edge multicast domain according to live parameter, the step that begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode specifically comprises: subscriber equipment obtains the session description file of each channel from the marginal flow media platform, and resolve this session description file, to obtain live parameter; Subscriber equipment is according to the live parameter obtained, begins to receive the code stream that can play of each channel that the edge direct broadcast server sends with multicast mode.
Preferably, above-mentioned internet protocol television direct broadcast method also comprises: central direct broadcast server is expanded into the code stream of each channel after the code stream that can play, sends to the center multicast domain in the multicast mode; The center steaming media platform reads and resolves the session description file of local each channel of preserving, obtains live parameter; The center steaming media platform adds the edge multicast domain according to the live parameter that is resolved to, and begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode; The code stream that can play of each channel that the center steaming media platform will receive is stored and is recorded.
Preferably, above-mentioned edge direct broadcast server obtains the code stream that can play of each channel from central direct broadcast server, and also comprise after sending to the step of edge multicast domain in the multicast mode: the marginal flow media platform reads and resolves the session description file of local each channel of preserving, obtains live parameter; The marginal flow media platform adds multicast domain according to the live parameter that is resolved to, and begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode; The code stream that can play of each channel that the marginal flow media platform will receive is stored and is recorded.
The present invention bears the code stream of each channel in the internet protocol television direct broadcast system and transmits and relaying by utilizing central direct broadcast server and edge direct broadcast server, realizes the direct service to subscriber equipment; Solved existing internet protocol television direct broadcast system and method and directly utilized center steaming media platform and marginal flow media platform to bear the code stream forwarding and the relaying of each channel, center steaming media platform that is caused and marginal flow media platform are owing to load too high influences service quality.
Description of drawings
Fig. 1 is the structural representation of existing internet protocol television direct broadcast system;
Fig. 2 is the structural representation of internet protocol television direct broadcast system one embodiment of the present invention;
Fig. 3 is the flow chart of internet protocol television direct broadcast method one embodiment of the present invention;
The flow chart that Fig. 4 stores and records the code stream that can play of each channel for center of the present invention steaming media platform;
The flow chart that Fig. 5 stores and records the code stream that can play of each channel for marginal flow media platform of the present invention.
The realization of the object of the invention, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Overall technological scheme of the present invention is that central direct broadcast server is expanded into the code stream that can play with the code stream of each channel; The edge direct broadcast server obtains the code stream that can play of each channel from central direct broadcast server, and sends to the edge multicast domain in the multicast mode; Subscriber equipment adds the edge multicast domain according to live parameter, begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode.Further specify technical scheme of the present invention below in conjunction with Figure of description and specific embodiment.
Fig. 2 is the structural representation of internet protocol television direct broadcast system one embodiment of the present invention.
Internet protocol television direct broadcast system in the present embodiment comprises live encoder server 10, center steaming media platform 30, marginal flow media platform 50, central direct broadcast server 20 (Center Media DistributionUnit, CMDU)/edge direct broadcast server 40 (Local Media Distribution Unit, and subscriber equipment LMDU).
Central direct broadcast server 20 is used for the code stream of each channel is expanded into the code stream that can play; Edge direct broadcast server 40 is used for obtaining from central direct broadcast server 20 code stream that can play of each channel, and sends to the edge multicast domain in the multicast mode; Subscriber equipment is used for adding the edge multicast domain according to live parameter, begins to receive the code stream that can play of each channel that edge direct broadcast server 40 sends in the multicast mode.
In another embodiment of the present invention, live encoder server 10 also is used for multicast mode the code stream of each channel being sent to central direct broadcast server 20.
Subscriber equipment also is used for obtaining from marginal flow media platform 50 session description file of each channel, and resolves this session description file, to obtain live parameter; And, begin to receive the code stream that to play of each channel that edge direct broadcast server 40 sends with multicast mode according to the live parameter of obtaining.Central direct broadcast server 20, the code stream that also is used for each channel is expanded into after the code stream that can play, sends to the center multicast domain in the multicast mode.
In another embodiment of the present invention, center steaming media platform 30 also is used to finish to be recorded and memory function, and particularly, center steaming media platform 30 also is used for: read and resolve the session description file of local each channel of preserving, obtain live parameter; Add the edge multicast domain according to the live parameter that is resolved to, begin to receive the code stream that to play of each channel that edge direct broadcast server 40 sends in the multicast mode; And the code stream that can play of each channel that will receive is stored and is recorded.
In another embodiment of the present invention, marginal flow media platform 50 also is used to finish to be recorded and memory function, and particularly, marginal flow media platform 50 also is used for: read and resolve the session description file of local each channel of preserving, obtain live parameter; Add multicast domain according to the live parameter that is resolved to, begin to receive the code stream that to play of each channel that edge direct broadcast server 40 sends in the multicast mode; And the code stream that can play of each channel that will receive is stored and is recorded.
Fig. 3 is the flow chart of internet protocol television direct broadcast method one embodiment of the present invention.
Step S301, live encoder server 10 sends to central direct broadcast server 20 with multicast mode with the code stream of each channel.
In the present embodiment, live encoder server 10 is by User Datagram Protoco (UDP) (User DatagramProtocol, UDP) code stream with each channel sends to central direct broadcast server 20, and this code stream is User Datagram Protoco (UDP) (User Datagram Protocol, a UDP) code stream.
Step S302, central direct broadcast server 20 is expanded into the code stream that can play with the code stream of each channel.
In the present embodiment, this code stream that can play is the code stream that subscriber equipment can be play, such as RTP (Real Time Transport Protocol, RTP) code stream.
Step S303, edge direct broadcast server 40 obtains the code stream that can play of each channel from central direct broadcast server 20, and sends to the edge multicast domain in the multicast mode.
In the present embodiment, this code stream that can play is the RTP code stream, edge direct broadcast server 40 obtains the code stream that can play of each channel by real time streaming transport protocol (Real Time Streaming Protocol) from central direct broadcast server 20, and the detailed process of obtaining the RTP code stream is as follows:
At first, edge direct broadcast server 40 at first initiates to describe request (DescribeRequest) to central direct broadcast server 20, with Session Description Protocol (Session Description Protocol, the SDP) file that obtains channel; Secondly, central direct broadcast server 20 is returned the description response (Describe Response) that has session description file to edge direct broadcast server 40; Then, edge direct broadcast server 40 is initiated the request of setting up (Setup Request) to central direct broadcast server 20; Then, central direct broadcast server 20 is returned to edge direct broadcast server 40 and is set up response (Setup Response), the form of this foundation response is RTSP 200OK, thereby successfully sets up the RTP code stream sendaisle between central direct broadcast server 20 and the edge direct broadcast server 40; At last, edge direct broadcast server 40 is initiated playing request (PlayRequest) to central direct broadcast server 20, it is RTSP 200 OK that central direct broadcast server 20 is returned the concrete form of playing this broadcast response of response (PlayResponse) to edge direct broadcast server 40, and edge direct broadcast server 40 can obtain the RTP code stream from central direct broadcast server 20 by the RTP code stream sendaisle of setting up before after receiving and playing response.
Step S304, subscriber equipment obtains the Session Description Protocol file of each channel from marginal flow media platform 50, and resolves this session description file, to obtain live parameter.
In the present embodiment, session description file records live parameter, and live parameter comprises the multicast port of each channel at the RTP of edge direct broadcast server 40 code stream, medium type, media coding form etc.
Subscriber equipment at first sends to describe asks marginal flow media platform 50, and marginal flow media platform 50 returns the description response that has the Session Description Protocol file to subscriber equipment; Then, subscriber equipment is resolved the session description file of each channel, to obtain live parameter.
Step S305, subscriber equipment be according to the live parameter obtained, begins to receive the code stream that can play of each channel that edge direct broadcast server 40 sends with multicast mode.
In the present embodiment, this code stream that can play is the RTP code stream, marginal flow media platform 50 is that (Internet Group Management Protocol IGMP) adds multicast domain, and obtains the RTP code stream that edge direct broadcast server 40 sends by sending Internet Group Management Protocol.
In another embodiment, can be by electric program menu (Electronic Program Guide, EPG) system is handed down to subscriber equipment with the live parameter of each channel and carries out buffer memory when subscriber equipment is logined, during the user equipment requests direct broadcast service, directly the live parameter according to buffer memory adds the edge multicast domain, does not need to obtain live parameter to marginal flow media platform 50 again.Electronic program menu system can be IGMP with the command format that live parameter is handed down to subscriber equipment: //MULTICASTIP:PORT, can certainly be other form, the present invention does not limit this.
The flow chart that Fig. 4 stores and records the code stream that can play of each channel for center of the present invention steaming media platform 30.
Recording in the present embodiment comprises that time-moving television is recorded with video on demand records, and concrete steps are as follows:
Step S401, central direct broadcast server 20 is expanded into the code stream of each channel after the code stream that can play, sends to the center multicast domain in the multicast mode.
Step S402, center steaming media platform 30 read and resolve the session description file of local each channel of preserving, obtain live parameter.
In the present embodiment, live parameter is the parameter that central direct broadcast server 20 sends the code stream that can play of each channel, and this live parameter comprises multicast address, multicast port, medium type, media coding form etc.; Center steaming media platform 30 and central direct broadcast server 20 belong in the same metropolitan area network, the local file system of center steaming media platform 30 stores the session description file of each channel, session description file has write down the multicast port of each channel at the RTP of central direct broadcast server 20 code stream, medium type, media coding form etc.Center steaming media platform 30 at first reads the session description file of each channel, and the session description file of each channel is resolved obtain live parameter.
Step S403, center steaming media platform 30 adds the edge multicast domain according to the live parameter that is resolved to, and begins to receive the code stream that can play of each channel that edge direct broadcast server 40 sends in the multicast mode.
Step S404, the code stream that can play of each channel that center steaming media platform 30 will receive is stored and is recorded.
The flow chart that Fig. 5 stores and records the code stream that can play of each channel for marginal flow media platform 50 of the present invention.
Step S501, marginal flow media platform 50 read and resolve the session description file of local each channel of preserving, obtain live parameter.
In the present embodiment, live parameter is the parameter that edge direct broadcast server 40 sends the code stream that can play of each channel, and this live parameter comprises multicast address, multicast port, medium type, media coding form etc.; Marginal flow media platform 50 and edge direct broadcast server 40 belong to same metropolitan area network, the local file system of marginal flow media platform 50 stores the session description file of each channel, session description file has write down the multicast port of each channel at the RTP of edge direct broadcast server 40 code stream, medium type, media coding form etc.Marginal flow media platform 50 at first reads the session description file of each channel, and the session description file of each channel is resolved obtain live parameter.
Step S502, marginal flow media platform 50 adds multicast domain according to the live parameter that is resolved to, and begins to receive the code stream that can play of each channel that edge direct broadcast server 40 sends in the multicast mode.
In the present embodiment, this code stream that can play is the RTP code stream, and marginal flow media platform 50 is to add multicast domain by sending Internet Group Management Protocol, and obtains the RTP code stream that edge direct broadcast server 40 sends.Therefore, marginal flow media platform 50 need not carry out the RTSP Signalling exchange with center steaming media platform 30, can obtain the code stream that can play of each channel.
Step S503, the code stream that can play of each channel that marginal flow media platform 50 will receive is stored and is recorded.
With existing internet protocol television direct broadcast system and method comparatively speaking, internet protocol television direct broadcast system of the present invention and method have following beneficial effect:
(1) the present invention bears the code stream of each channel in the internet protocol television direct broadcast system and transmits and relaying by utilizing central direct broadcast server 20 and edge direct broadcast server 40, realizes the direct service to subscriber equipment; Solved existing internet protocol television direct broadcast system and method and directly utilized center steaming media platform 30 and marginal flow media platform 50 to bear the code stream forwarding and the relaying of each channel, center steaming media platform 30 that is caused and marginal flow media platform 50 are owing to load too high influences service quality;
(2) the live junction network of being set up between central direct broadcast server 20 of the present invention and the edge direct broadcast server 40 is easy to expansion; Solved in existing internet protocol television direct broadcast system and the method and directly between center steaming media platform 30 and marginal flow media platform 50, set up relaying, the problem that is not easy to expand;
(3) only carry out the code stream that Signalling exchange can obtain each channel that edge direct broadcast server 40 sends between subscriber equipment among the present invention and the marginal flow media platform 50; Solved and to have carried out at least three times in existing internet protocol television direct broadcast system and the method and just can obtain the code stream of each channel alternately, and influenced the problem of user experience.
The above only is the preferred embodiments of the present invention; be not so limit its claim; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (11)
1. an internet protocol television direct broadcast system is characterized in that, comprises central direct broadcast server, edge direct broadcast server and subscriber equipment, wherein:
Described central direct broadcast server is used for the code stream of each channel is expanded into the code stream that can play;
Described edge direct broadcast server is used for obtaining from central direct broadcast server the code stream that can play of each channel, and sends to the edge multicast domain in the multicast mode;
Described subscriber equipment is used for adding the edge multicast domain according to live parameter, begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode.
2. internet protocol television direct broadcast system as claimed in claim 1 is characterized in that, also comprises live encoder server, is used for multicast mode the code stream of each channel being sent to central direct broadcast server.
3. internet protocol television direct broadcast system as claimed in claim 1 is characterized in that described subscriber equipment also is used for obtaining from the marginal flow media platform session description file of each channel, and resolves this session description file, to obtain live parameter; And
According to the live parameter of obtaining, begin to receive the code stream that to play of each channel that the edge direct broadcast server sends with multicast mode.
4. internet protocol television direct broadcast system as claimed in claim 1 is characterized in that, described central direct broadcast server, and the code stream that also is used for each channel is expanded into after the code stream that can play, sends to the center multicast domain in the multicast mode.
5. internet protocol television direct broadcast system as claimed in claim 4 is characterized in that, described center steaming media platform also is used for:
Read and resolve the session description file of local each channel of preserving, obtain live parameter;
Add the edge multicast domain according to the live parameter that is resolved to, begin to receive the code stream that to play of each channel that the edge direct broadcast server sends in the multicast mode; And
The code stream that can play of each channel of receiving is stored and recorded.
6. internet protocol television direct broadcast system as claimed in claim 4 is characterized in that, described marginal flow media platform also is used for:
Read and resolve the session description file of local each channel of preserving, obtain live parameter;
Add multicast domain according to the live parameter that is resolved to, begin to receive the code stream that to play of each channel that the edge direct broadcast server sends in the multicast mode; And
The code stream that can play of each channel of receiving is stored and recorded.
7. an internet protocol television direct broadcast method is characterized in that, may further comprise the steps:
Central direct broadcast server is expanded into the code stream that can play with the code stream of each channel;
The edge direct broadcast server obtains the code stream that can play of each channel from central direct broadcast server, and sends to the edge multicast domain in the multicast mode;
Subscriber equipment adds the edge multicast domain according to live parameter, begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode.
8. internet protocol television direct broadcast method as claimed in claim 7, it is characterized in that, described edge direct broadcast server obtains the code stream that can play of each channel from central direct broadcast server, and also comprises send to the step of edge multicast domain in the multicast mode before:
Live encoder server sends to central direct broadcast server with multicast mode with the code stream of each channel.
9. internet protocol television direct broadcast method as claimed in claim 8, it is characterized in that, described subscriber equipment adds the edge multicast domain according to live parameter, and the step that begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode specifically comprises:
Subscriber equipment obtains the session description file of each channel from the marginal flow media platform, and resolves this session description file, to obtain live parameter;
Subscriber equipment is according to the live parameter obtained, begins to receive the code stream that can play of each channel that the edge direct broadcast server sends with multicast mode.
10. internet protocol television direct broadcast method as claimed in claim 8 is characterized in that, also comprises:
Described central direct broadcast server is expanded into the code stream of each channel after the code stream that can play, sends to the center multicast domain in the multicast mode;
Described center steaming media platform reads and resolves the session description file of local each channel of preserving, obtains live parameter;
Described center steaming media platform adds the edge multicast domain according to the live parameter that is resolved to, and begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode;
The code stream that can play of each channel that described center steaming media platform will receive is stored and is recorded.
11. internet protocol television direct broadcast method as claimed in claim 8, it is characterized in that, described edge direct broadcast server obtains the code stream that can play of each channel from central direct broadcast server, and also comprises send to the step of edge multicast domain in the multicast mode after:
Described marginal flow media platform reads and resolves the session description file of local each channel of preserving, obtains live parameter;
Described marginal flow media platform adds multicast domain according to the live parameter that is resolved to, and begins to receive the code stream that can play of each channel that the edge direct broadcast server sends in the multicast mode;
The code stream that can play of each channel that described marginal flow media platform will receive is stored and is recorded.
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| CN103124366A (en) * | 2011-11-21 | 2013-05-29 | 苏州达联信息科技有限公司 | Method and device for controlling live broadcast business of video distribution network |
| CN103124366B (en) * | 2011-11-21 | 2016-12-14 | 苏州达联信息科技有限公司 | The direct broadcast service control method of a kind of Video Distribution Network and device |
| CN103139606A (en) * | 2011-11-29 | 2013-06-05 | 苏州达联信息科技有限公司 | Service failure remote detection method and device for live video distribution network |
| CN103139659A (en) * | 2011-11-29 | 2013-06-05 | 苏州达联信息科技有限公司 | Live video distribution network service failure remote testing device |
| CN103139659B (en) * | 2011-11-29 | 2016-12-07 | 苏州达联信息科技有限公司 | A kind of live video distribution service failure remote test device |
| CN105992030A (en) * | 2015-02-27 | 2016-10-05 | 天津铂创国茂电子科技发展有限公司 | Method for realization of television live based on cloud branch server |
| WO2017008561A1 (en) * | 2015-07-13 | 2017-01-19 | 中兴通讯股份有限公司 | Multicast method, multicast relay device and system |
| CN115086779A (en) * | 2021-12-17 | 2022-09-20 | 浙江大华技术股份有限公司 | Video transmission system |
| CN115086779B (en) * | 2021-12-17 | 2024-04-16 | 浙江大华技术股份有限公司 | Video transmission system |
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| CN101867804B (en) | 2014-04-09 |
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