CN101056231A - Stream media-based public video system and its implementation method - Google Patents

Stream media-based public video system and its implementation method Download PDF

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Publication number
CN101056231A
CN101056231A CNA2006100355165A CN200610035516A CN101056231A CN 101056231 A CN101056231 A CN 101056231A CN A2006100355165 A CNA2006100355165 A CN A2006100355165A CN 200610035516 A CN200610035516 A CN 200610035516A CN 101056231 A CN101056231 A CN 101056231A
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CN
China
Prior art keywords
streaming media
user
network
streaming
public video
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Pending
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CNA2006100355165A
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Chinese (zh)
Inventor
彭东红
吴盛
赖夏茗
范晓继
尧浩
杜涛
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CNA2006100355165A priority Critical patent/CN101056231A/en
Priority to PCT/CN2007/001624 priority patent/WO2007137500A1/en
Publication of CN101056231A publication Critical patent/CN101056231A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47End-user applications
    • H04N21/472End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/4728End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for selecting a Region Of Interest [ROI], e.g. for requesting a higher resolution version of a selected region
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21Server components or server architectures
    • H04N21/218Source of audio or video content, e.g. local disk arrays
    • H04N21/2187Live feed
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6106Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6156Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6175Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via Internet
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/63Control 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
    • H04N21/637Control signals issued by the client directed to the server or network components
    • H04N21/6377Control signals issued by the client directed to the server or network components directed to server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/173Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309Transmission or handling of upstream communications
    • H04N7/17318Direct or substantially direct transmission and handling of requests

Abstract

The invention discloses streaming-based public video system and its implementation method based on the IP network, this system consists of the front-end device, which is used to real time get the streaming information and encode and compress this media information as the streaming; streaming server, which is used to receive and store the described streaming and real time and continuously transfer the described streaming to this user terminal according to the request of the user terminal; the streaming management system, which is used to validate the user terminal information, control the described streaming server to publish the described streaming to the described IP network, and control the described streaming server to publish the described streaming to the publishing nodes; the user platform, which is located between the described IP network and described streaming management system, is used to send the user terminal information to the described streaming management system for validation, and provide the video service selection UI for the user terminal. The invention can realize the public video service via multiple modes and is scalable in the service.

Description

Public video system and implementation method based on Streaming Media
Technical field
The present invention relates to the real time communication technical field, especially relate to a kind of public video system and implementation method based on Streaming Media.
Background technology
Along with developing rapidly of broadband network, especially the network bandwidth increases, for broadband business such as wideband multimedia, wideband video provide the chance that develops rapidly.Broadband video service on the Internet roughly comprises 2 classes at present: a class is video request program (Video on Demand is called for short a VOD) business, and an other class is the very strong video monitoring service of professional.
Shown in Figure 1A, be existing video order service system schematic diagram.The user utilizes PC 120 by modulator-demodulator 130 dialing, via digital subscriber line access multiplex (Digital Subscriber LineAccess Multiplexer, abbreviation DSLAM) 140 lands to IP network 100, and by the video on these IP network 100 program request VOD servers 110, wherein, the database 111 in this VOD server 110 is used to preserve historical video data.Yet the service surface that offers the user owing to this video order service system is narrower, therefore causes its professional autgmentability relatively poor; In addition, because VOD service is subjected to all multifactor restrictions such as the network bandwidth, network quality and video Data Transmission quality, described video order service system is difficult to the user and provides real live live.
Shown in Figure 1B, be existing video monitoring service system schematic.Headend equipment is a web camera 110, is used to gather real time video data; The user utilizes PC 120 by modulator-demodulator 130 dialing, lands to IP network 100 via DSLAM 140, and needs purview certification by control centre 150, user just can land to described web camera 110 to obtain video image.Owing to the user who obtains video image need directly land to described web camera 110, yet consider the service bottleneck of described web camera 110, the calling party amount was very limited when promptly described web camera 110 can provide; And this video monitoring service has stronger professional characteristics, and therefore, described video monitoring service system only is suitable for monitoring, is not easy to the user and carries out business and expand.
Summary of the invention
The technical problem that the present invention solves provides a kind of public video system and implementation method based on Streaming Media, on broadband networks, to provide public video business based on Streaming Media by number of ways, realization true VOD business, and the professional autgmentability of enhancing public video system.
For addressing the above problem, the invention discloses a kind of public video system based on Streaming Media, be based upon on the IP network basis, for the user of user terminal correspondence provides the public video business, key is that this system comprises:
Headend equipment is used for obtaining in real time media information, and this media information coding, compression are processed into Streaming Media;
Streaming media server is used for receiving, storing described Streaming Media, and asks to be sent to described media stream in real time, continuously corresponding user terminal according to the user;
Streaming management system is used to verify user profile, and controls described streaming media server described Streaming Media is distributed to described IP network, and controls the publishing point that described streaming media server is issued described Streaming Media;
User platform between described IP network and described streaming management system, is used for that user profile is sent to described streaming management system and verifies, and provides the interface of selecting videoconferencing service for the user.
Described user platform is a portal website, and this portal website comprises some Streaming Media tie points of corresponding described headend equipment, and the user lands this portal website and selects this Streaming Media tie point to obtain corresponding videoconferencing service.
Described user platform is that electronic programming guides platform, and this electronic programming guides platform to comprise the program menu of some Streaming Media publishing point of corresponding described headend equipment, and the user lands electronic programming and guides this program menu of platform selecting to obtain corresponding videoconferencing service.
Correspondingly, the invention also discloses a kind of public video system implementation method based on Streaming Media, key is may further comprise the steps:
A. headend equipment obtains media information in real time and is treated to Streaming Media, and this Streaming Media is sent to streaming media server;
B. described streaming media server lands to the selected videoconferencing service of user platform according to the user of user terminal correspondence the Streaming Media of correspondence is distributed to this user.
Described user platform is a portal website, and described step a also comprises:
In described portal website, create the tie point of corresponding described Streaming Media.
Described user platform is that electronic programming guides platform, and described step a also comprises:
Described streaming media server is created the publishing point of corresponding described Streaming Media;
Guide the program menu of creating the described Streaming Media publishing point of mapping on the platform at described electronic programming.
Described step b also comprises:
Streaming management system is verified landing to the user profile of described user platform, if by checking, then described streaming management system is controlled described streaming media server this user is sent to described user at the pairing Streaming Media of the selected videoconferencing service of described user platform, otherwise, provide the video signal service by described user platform prompting user refusal.
Described headend equipment is a web camera, this web camera is sent to described streaming media server by the Virtual Private Network passage with described Streaming Media, or this web camera inserts described IP network by modulator-demodulator, by described IP network described Streaming Media is sent to described streaming media server.
Described user terminal inserts described IP network by modulator-demodulator; Described user terminal be PC, IP phone and set-top box one of them; Described user terminal is a wireless terminal device, and inserts described IP network by cordless communication network.
Described wireless terminal device is a 3G terminal equipment, and described cordless communication network is a 3G network.
Described wireless terminal device is for supporting the wireless terminal device of satellite communication, and described cordless communication network is a satellite communication network.
Compared with prior art, the present invention has following beneficial effect:
1. headend equipment is a web camera among the present invention, has broken through that web camera only is used for monitoring trade in the prior art, makes web camera can be applied to the public video business field;
2. because after the media information of web camera collection is treated to Streaming Media, this Streaming Media is sent to streaming media server, and the Streaming Media of the videoconferencing service correspondence of the user being selected by streaming management system control flows media server is sent to the user, therefore, the invention solves web camera in the prior art and only can hold the bottleneck restriction of limited calling party, and saved the bandwidth between web camera and the streaming media server, be more conducive to improve the real-time and the continuity of Streaming Media transmission;
3. the present invention can pass through number of ways, realizes the public video business by multiple communication network, has preferable professional autgmentability.
Description of drawings
Figure 1A is existing video order service system schematic diagram.
Figure 1B is existing video monitoring service system schematic.
Fig. 2 is a system schematic of the present invention.
Fig. 3 A is the flow chart that Streaming Media of the present invention is distributed to first embodiment of streaming media server.
Fig. 3 B is the flow chart that user of the present invention obtains first embodiment of public video business.
Fig. 4 A is the flow chart that Streaming Media of the present invention is distributed to second embodiment of streaming media server.
Fig. 4 B is the flow chart that user of the present invention obtains second embodiment of public video business.
Embodiment
Please referring to shown in Figure 2, the schematic diagram that discloses for the present invention based on the public video system of Streaming Media (Streaming Media).This video-signal system is based upon on the basis of IP network, and for the user of user terminal correspondence provides the public video business, this system comprises:
IP network 210;
Be the headend equipment of web camera 220, this web camera 220 is used for obtaining in real time media information, and this media information coding, compression are processed into Streaming Media; Wherein, described web camera 220 inserts described IP network 210 by 2 kinds of modes, the first is utilized Virtual Private Network (Virtual Private Networks, abbreviation VPN) 263 passages insert described IP network 210, and another is to utilize modulator-demodulator 261 (or also by DSLAM 262) to insert described IP network 210;
Streaming media server 230 is used to receive, store the described Streaming Media that described web camera 220 correspondences are obtained, and asks to be sent to described media stream in real time, continuously corresponding user terminal according to the user;
Streaming management system 240, comprise Internet Protocol Television user management subsystem (Internet Protocol TVSubscriber Management System, be called for short IPTV SMS) 241, generic server ADMINISTRATION SUBSYSTEM (Universal Server Manager, be called for short USM) 242 and database (Database, be called for short DB) 243, this streaming management system 240 is used to verify user profile, and control described streaming media server described Streaming Media is distributed to described IP network, and control the publishing point that described streaming media server is issued described Streaming Media;
User platform, this user platform is that (Web Portal) 251 of portal website or electronic programming guide platform (Electronic Program Guide, be called for short EPG) 252, this user platform is between described IP network 210 and described streaming management system 240, be used for that user profile is sent to described streaming management system 240 and verify, and provide the interface of selecting videoconferencing service for the user.
Wherein, described portal website 251 comprises some Streaming Media tie points of corresponding described web camera 220, the user lands this portal website 251, and described streaming management system 240 is according to verifying verification to landing to the user profile of described portal website 251, to confirm user identity and authority; The described Streaming Media tie point of user by selecting is to obtain corresponding videoconferencing service, described streaming management system 240 is according to user-selected described Streaming Media tie point, control described streaming media server 230 with the media stream in real time of described Streaming Media tie point correspondence, continuous be sent to the user; If one group of user selects same described Streaming Media tie point simultaneously, described streaming management system 240 will control described streaming media server 230 with the Streaming Media of described Streaming Media tie point correspondence to this group users broadcasting that is connected in described IP network 210.
Certainly, the pairing Streaming Media of described Streaming Media tie point comprises the history of a plurality of described web camera 220 that inserts described IP network 100, the Streaming Media of real-time media information, and the user obtains the history or the real-time media information service of some or a plurality of described web cameras 220 according to the demand of oneself by selecting described Streaming Media tie point with selection.
In addition, described electronic programming guides platform 252 to comprise the program menu of some Streaming Media publishing point of corresponding described web camera 220, and the user lands electronic programming and guides platform 252 to select this program menu to obtain corresponding videoconferencing service.Wherein, described web camera 220 obtains media information and is processed into Streaming Media, and this Streaming Media is sent to described streaming media server 230, and be provided with according to relevant in the described streaming media server 230 and (for example create corresponding Streaming Media publishing point, increase a web camera 220 to this video-signal system newly, during startup, to in described streaming media server 230, create Streaming Media publishing point that should web camera 220, and through a Preset Time or obtain media information task termination etc., the media information of this Streaming Media publishing point correspondence is compared with real-time media information, described streaming media server 230 will become historical media information, so will be created another one with to Streaming Media publishing point that should web camera 220 real-time media information.); Described Streaming Media publishing point and described electronic programming guide the program menu in the platform 252 to shine upon one by one, land described electronic programming and guide platform 252 and obtain corresponding videoconferencing service by the described program menu of the user by selecting of described streaming management system 240.
Among the present invention, described user's corresponding user terminal can insert described IP network 210 in the following way:
The one, described user terminal lands to described IP network 210 via DSLAM 262 by modulator-demodulator 261, and wherein, described user terminal is IP phone 271 or PC 272 or set-top box (Set TopBox is called for short STB) 273;
Another is that described user terminal inserts described IP network 210 by wireless network, and wherein, described wireless network is a satellite communication network 281, and described user terminal is for supporting the wireless terminal of satellite communication; Described wireless network also can be 3G network 283, and corresponding described user terminal is a 3G terminal 275, and described 3G terminal 275 inserts described IP network 210 by described 3G network 283 and 3G gateway 282.
From the above, the present invention has broken through the restriction of prior art, web camera is applied to the public video business field, and will be sent to streaming media server through the Streaming Media of web camera collection and processing, and streaming media server is distributed to user to the selection of videoconferencing service with the Streaming Media of correspondence from user platform according to the user, therefore, save the network bandwidth between web camera and the streaming media server on the one hand, also avoided the bottleneck problem that web camera limits calling party in the prior art on the other hand.
Accordingly, the present invention has also disclosed a kind of public video system implementation method based on Streaming Media, is used for aforesaid public video system, and this method comprises two kinds of embodiments:
Embodiment one
Described user platform is a portal website.Method of the present invention comprises the flow process that Streaming Media is distributed to streaming media server, sees also shown in Fig. 3 A, specifically comprises:
Step s310: headend equipment obtains media information in real time and is treated to Streaming Media;
Step s320: this Streaming Media is sent to streaming media server;
Step s330: the tie point of in described portal website, creating corresponding described Streaming Media;
Step s340: the user of user terminal correspondence lands to user platform.
The present invention comprises that also the user obtains the flow process of corresponding public video business, sees also shown in Fig. 3 B, specifically comprises:
Step s350: the user selects described Streaming Media publishing point to select corresponding videoconferencing service by user platform;
Step s360: streaming management system is verified landing to the user profile of described user platform;
If by checking, then described streaming management system is controlled described streaming media server this user is sent to described user (step s370) at the Streaming Media of the selected described Streaming Media publishing point correspondence of described user platform; Otherwise, provide video signal service (step s380) by described user platform prompting user refusal.
Wherein, if one group of user selects same described Streaming Media publishing point selecting identical videoconferencing service simultaneously, then described streaming management system is controlled described streaming media server the Streaming Media of described Streaming Media tie point correspondence is broadcast to this group user.
Embodiment two
Described user platform is that electronic programming guides platform.Method of the present invention comprises the flow process that Streaming Media is distributed to streaming media server, sees also shown in Fig. 4 A, specifically comprises:
Step s410: headend equipment obtains media information in real time and is treated to Streaming Media;
Step s420: this Streaming Media is sent to streaming media server;
Step s430: described streaming media server is created the publishing point of corresponding described Streaming Media;
Step s440: guide the program menu of creating the described Streaming Media publishing point of mapping on the platform at described electronic programming.
The present invention comprises that also the user obtains the flow process of corresponding public video business, sees also shown in Fig. 4 B, specifically comprises:
Step s450: the user of user terminal correspondence lands to user platform;
Step s460: the user selects described program menu to select corresponding videoconferencing service by user platform;
Step s470: streaming management system is verified landing to the user profile of described user platform;
If by checking, then described streaming management system is controlled described streaming media server this user is sent to described user (step s480) at the pairing Streaming Media of the selected videoconferencing service of described user platform; Otherwise, provide video signal service (step s490) by described user platform prompting user refusal.
Wherein, if one group of user selects same described Streaming Media publishing point to select identical videoconferencing service simultaneously, then described streaming management system controls described streaming media server and this group user sets up a Streaming Media transmission channel from described Streaming Media publishing point to described user respectively.
Among the present invention, described headend equipment is sent to described streaming media server by the VPN passage with described Streaming Media, or described headend equipment inserts described IP network by modulator-demodulator, by described IP network described Streaming Media is sent to described streaming media server.
Described user's corresponding user terminal can insert described IP network in the following way:
The one, described user terminal lands to described IP network via DSLAM by modulator-demodulator, and wherein, described user terminal is IP phone or PC or set-top box;
Another is that described user terminal inserts described IP network by wireless network, and wherein, described wireless network is a satellite communication network, and described user terminal is for supporting the wireless terminal of satellite communication; Described wireless network also can be 3G network, and corresponding described user terminal is a 3G terminal, and described 3G terminal inserts described IP network by described 3G network and 3G gateway.
Above embodiment only in order to the explanation the present invention and and unrestricted technical scheme described in the invention; Therefore, although this specification has been described in detail the present invention with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.

Claims (17)

1. the public video system based on Streaming Media is based upon on the IP network basis,, it is characterized in that this system comprises for user terminal provides the public video business:
Headend equipment is used for obtaining in real time media information, and this media information coding, compression are processed into Streaming Media;
Streaming media server is used for receiving, storing described Streaming Media, and according to user terminal requests with described media stream in real time, be sent to this user terminal continuously;
Streaming management system is used to verify user terminal information, and controls described streaming media server described Streaming Media is distributed to described IP network, and controls the publishing point that described streaming media server is issued described Streaming Media;
User platform between described IP network and described streaming management system, is used for that user terminal information is sent to described streaming management system and verifies, and provides the interface of selecting videoconferencing service for user terminal.
2. according to the described public video system of claim 1 based on Streaming Media, it is characterized in that, described user platform is a portal website, this portal website comprises some Streaming Media tie points of corresponding described headend equipment, and the user lands this portal website and selects this Streaming Media tie point to obtain corresponding videoconferencing service.
3. according to the described public video system of claim 1 based on Streaming Media, it is characterized in that, described user platform is that electronic programming guides platform, this electronic programming guides platform to comprise the program menu of some Streaming Media publishing point of corresponding described headend equipment, and user terminal lands electronic programming and guides this program menu of platform selecting to obtain corresponding videoconferencing service.
4. according to claim 1 or 2 or 3 described public video systems based on Streaming Media, it is characterized in that, described headend equipment is a web camera, this web camera is sent to described streaming media server by the Virtual Private Network passage with described Streaming Media, or this web camera inserts described IP network by modulator-demodulator, by described IP network described Streaming Media is sent to described streaming media server.
5. according to the described public video system of claim 4, it is characterized in that described user terminal inserts described IP network by modulator-demodulator based on Streaming Media, described user terminal be PC, IP phone and set-top box one of them.
6. according to the described public video system of claim 4, it is characterized in that described user terminal is a wireless terminal device, and insert described IP network by cordless communication network based on Streaming Media.
7. according to the described public video system based on Streaming Media of claim 6, it is characterized in that described wireless terminal device is a 3G terminal equipment, described cordless communication network is a 3G network.
8. according to the described public video system based on Streaming Media of claim 6, it is characterized in that described wireless terminal device is for supporting the wireless terminal device of satellite communication, described cordless communication network is a satellite communication network.
9. public video system implementation method based on Streaming Media,, it is characterized in that, may further comprise the steps:
A. headend equipment obtains media information in real time and is treated to Streaming Media, and this Streaming Media is sent to streaming media server;
B. described streaming media server lands to the selected videoconferencing service of user platform according to the user of user terminal correspondence the Streaming Media of correspondence is distributed to this user.
10. the public video system implementation method based on Streaming Media according to claim 9 is characterized in that described user platform is a portal website, and described step a also comprises:
In described portal website, create the tie point of corresponding described Streaming Media.
11. the public video system implementation method based on Streaming Media according to claim 9 is characterized in that, described user platform is that electronic programming guides platform, and described step a also comprises:
Described streaming media server is created the publishing point of corresponding described Streaming Media;
Guide the program menu of creating the described Streaming Media publishing point of mapping on the platform at described electronic programming.
12., it is characterized in that described step b also comprises according to claim 9 or 10 or 11 described public video system implementation methods based on Streaming Media:
Streaming management system is verified landing to the user profile of described user platform, if by checking, then described streaming management system is controlled described streaming media server this user is sent to described user at the pairing Streaming Media of the selected videoconferencing service of described user platform, otherwise, provide the video signal service by described user platform prompting user refusal.
13. the public video system implementation method based on Streaming Media according to claim 12, it is characterized in that, described headend equipment is sent to described streaming media server by the Virtual Private Network passage with described Streaming Media, or described headend equipment inserts described IP network by modulator-demodulator, by described IP network described Streaming Media is sent to described streaming media server.
14. the public video system implementation method based on Streaming Media according to claim 12 is characterized in that described user terminal inserts described IP network by modulator-demodulator, described user terminal be PC, IP phone and set-top box one of them.
15., it is characterized in that described user terminal is a wireless terminal device, and insert described IP network by cordless communication network according to the described public video system implementation method of claim 12 based on Streaming Media.
16. according to the described public video system implementation method based on Streaming Media of claim 15, it is characterized in that described wireless terminal device is a 3G terminal equipment, described cordless communication network is a 3G network.
17., it is characterized in that described wireless terminal device is for supporting the wireless terminal device of satellite communication according to the described public video system implementation method based on Streaming Media of claim 15, described cordless communication network is a satellite communication network.
CNA2006100355165A 2006-05-18 2006-05-18 Stream media-based public video system and its implementation method Pending CN101056231A (en)

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