CN101656864A - Method for realizing selection and watching of video and video session system - Google Patents
Method for realizing selection and watching of video and video session system Download PDFInfo
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Abstract
The invention discloses a method for realizing selection and watching of video and a video session system. For video signal passing through two connecting MCU, namely a first MCU and a second MCU froma selected objective terminal to a watching terminal, the method comprises that the first MCU received a video selecting-watching instruction transmits video signal of the selected objective terminalthrough a second cascaded channel of the second MCU, wherein the connection channel preestablished between the first MCU and the second MCU comprises a first cascaded channel and the second cascadedchannel which is used for transmitting the selecting-watching video signal. The invention can improve success rate of selecting and watching video, and improve user experience.
Description
Technical field
The present invention relates to the video conferencing technology field, relate in particular to a kind of implementation method and video session system of selection and watching of video.
Background technology
Video conferencing system is to support the multimedia communications system of sound, video and data communication, and it mainly comprises: video conference terminal, multipoint control unit (Multipoint ControlUnit abbreviates MCU as) and some other equipment.H.320 or ITU-T standard H.323 present video conferencing system generally meets ITU-T, and the video conferencing system that meets IETF SIP standard is also arranged.
ITU-T is standard definition and described the composition and the protocols of the video conferencing system that is carried on circuit-switched network H.320, in standard H.320, mainly entities such as terminal, MCU and gateway is defined.ITU-T is standard definition and composition and the protocols of having described the multimedia conference system that is carried on IP network H.323, mainly terminal, MCU, gateway entity and gatekeeper's entity are defined, wherein, the gatekeeper is mainly used in registration, rights management, address resolution of the equipment of finishing etc.The main processing signaling of gatekeeper is not generally handled Media Stream.
Terminal is the equipment of user for use, mainly is made up of sound/Video Codec and sound/video input/output peripheral.Wherein, codec is used for the compressed encoding of medium such as sound, video and decoding, and with the communication function of network.In addition, terminal also is connected with such as input/output peripherals such as microphone, sound equipment, camera, displays, is used to finish the input and output of sound, video.In addition, terminal can also comprise user's input interface, for example, Infrared remote controller, the user by input interface to terminal input instruction and information.Terminal is responsible for and the other side's terminal (or MCU, gateway) connects, and consults both sides' codec capabilities, and the code decode algorithm that adopts both sides to support carries out Media Stream communication.
MCU is used to realize Multi-Party Conference communication.The terminal and the MCU that participate in Multi-Party Conference communication connect, and carry out the communication of Media Stream.MCU is responsible for finishing exchange, conversion and the mixed processing of Media Stream.For acoustic medium stream, MCU is generally the synthetic acoustic medium stream of a process of each terminal output audio mixing, and the sound of several roads terminal of the synthetic general selection input volume maximum of audio mixing mixes.For video media stream, MCU can send the single-image video flowing of another terminal for certain terminal, if MCU supports many picture functions, also can synthesize a multiple image to the video that a plurality of terminals are come, and sends to certain or some terminals then.
Gateway is used to finish between the different networks or the intercommunication between the terminal of different abilities, for example, supports H.320 terminal and communication between terminals H.323.
In a video conferencing system, one or more meeting control devices can be provided usually, wherein, the meeting control operation comprises video broadcasting, selection and watching of video, interpolation meeting, deletion meeting etc.ITU-T H.243 with ITU H.245 in standard definition the relevant rules of terminal chairman's meeting control of system H.320.Chairman's meeting control is a kind of with interior conference control method, in addition, most video conference device manufacturer also provides band outer conference control method, also can be described as director's control, the general conference management software that adopts of director's control is directly controlled the MCU realization, finishes the function of similar chairman's control.
In some application scenario, a video council parliament uses a plurality of MCU, can be described as subtended conference.Adopt star topology to cascade up between each MCU, promptly have a main MCU, this MCU connects a plurality of from MCU, as required, can also connect the third level from MCU from MCU, and the like, ITU-T H.243 standard to describe the foundation and the control method of subtended conference.Subtended conference can be broken through the capacity limit of single MCU, and, by the MCU cascade, can reduce the key bandwidth consumption of cross-region meeting.
Selection and watching of video is meant that certain terminal selects to watch the vision signal of another terminal.The selection and watching of video operation can be controlled realization by chairman, also can realize by the outer control mode of band.Because in the system of a routine realizes, main MCU and respectively from a cascaded link is only arranged between the MCU, therefore, selection and watching of video can't run succeeded in some cases.For example, suppose that chairman's terminal is connected main MCU, chairman's terminal is broadcasted the vision signal (being called the speech terminal at this) of certain terminal 1 from the MCU, if chairman's terminal wants to select the vision signal of seeing this terminal 2 from the MCU, owing to uploading the vision signal of speech terminal this moment from MCU, can't upload choosing again and see the vision signal of terminal, thereby cause the selection and watching of video failure.
Summary of the invention
In view of this, the invention provides a kind of implementation of selection and watching of video, in order to solve in the prior art because each may cause the problem of selection and watching of video failure from a cascaded link is only arranged between the MCU.
A kind of implementation method of selection and watching of video is provided according to an aspect of the present invention.
Implementation method according to selection and watching of video of the present invention comprises: for two MCU that are connected on the path of the video signal flow from the selected target terminal of seeing to viewing terminal: a MCU and the 2nd MCU, a MCU who receives the selection and watching of video order by and the 2nd MCU between the second cascade interface channel transmit the selected vision signal of seeing target terminal to the 2nd MCU, wherein, the interface channel of setting up in advance between the one MCU and the 2nd MCU comprises: the first cascade interface channel and the second cascade interface channel, the second cascade interface channel are used for transmitting choosing and see vision signal.
According to another aspect of the present invention, provide a kind of video conferencing system.
Video session system according to the present invention comprises: one or more MCU, one or more terminal, and wherein, each terminal communicates with a MCU respectively by network; Establish two cascades between each MCU and connect, one of them cascade connects to be used for transmitting selecting sees vision signal, when receiving the selection and watching of video order, connects the vision signal of transmitting target terminal by this cascade between each MCU.
By above-mentioned at least one scheme of the present invention, connect by between each MCU, setting up two cascades, when selection and watching of video, each MCU on the path connects the vision signal of transmitting target terminal by one of them cascade, thereby solved because each may cause the problem of selection and watching of video failure from a cascaded link is only arranged between the MCU, improve the success rate of selection and watching of video, improved user experience.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is that a kind of subtended conference system according to the embodiment of the invention forms structure chart;
Fig. 2 is the flow chart according to the implementation method of the selection and watching of video of the embodiment of the invention;
Fig. 3 is the connection topological relation schematic diagram of a subtended conference in the embodiment of the invention;
Fig. 4 is the flow chart of embodiment one;
Fig. 5 is the flow chart of embodiment two;
Fig. 6 is the flow chart of embodiment three;
Fig. 7 is for to see video transmit path schematic diagram according to a kind of choosing of the embodiment of the invention.
Embodiment
Functional overview
In the prior art owing to have only cascade to connect between the MCU at different levels, thereby make when the vision signal of uploading the speech terminal from MCU, can't upload the vision signal that terminal is seen in choosing again, thereby cause the selection and watching of video failure, at this problem, the embodiment of the invention provides a kind of implementation of improved selection and watching of video.In embodiments of the present invention, in the subtended conference system, the cascade that one of expansion is used to transmit the vision signal of selection and watching of video between MCU at different levels connects, and when receiving the selection and watching of video order, MCU transmits the vision signal of target terminal by this cascade interface channel.
Under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
For the ease of understanding the embodiment of the invention, below at first the related subtended conference system of the embodiment of the invention is simply introduced with a concrete example.
According to the embodiment of the invention, at first provide a kind of video conferencing system.
Video conferencing system according to the embodiment of the invention mainly comprises: one or more MCU, one or more terminal.Wherein, each terminal communicates with a MCU respectively by network, establishing two cascades between every couple of MCU of the superior and the subordinate connects, one of them cascade connects to be used for transmitting selecting sees vision signal, when receiving the selection and watching of video order, connect the vision signal of transmitting target terminal by this cascade between every couple of MCU of the superior and the subordinate.
Further, include chairman's terminal in above-mentioned one or more terminals, this chairman's terminal can send the selection and watching of video order to the MCU of its connection, asks the video of certain terminal.
Wherein, in the embodiment of the invention, the MCU of the superior and the subordinate is meant at conferencing resource and divides two the adjacent MCU not at the same level that are in that timing determines, for example, main MCU is each secondary of being attached thereto higher level MCU from MCU, and secondary is each the three grades higher level MCU from MCU that are attached thereto from MCU.
And, this system can also comprise a meeting control management module, be connected with each MCU respectively, this meeting control management module can be used to calculate video signal flow from the selected target terminal of seeing to viewing terminal through the path, and sends selection and watching of video order to this video signal flow each MCU in the path.
Fig. 1 has described that a kind of subtended conference system forms structure chart in the embodiment of the invention.For convenience, in Fig. 1, only show 3 MCU and 6 terminals, omitted concrete networking physical details, also may comprise MCU and terminal equipment more in actual applications, also may comprise the equipment of some other type in addition, as gatekeeper H.323.
MCU 1 is one and supports simultaneously H.323 and standard H.320 that MCU 2 only supports H.320 standard among Fig. 1, and MCU 3 only supports H.323 standard.Terminal 1, terminal 2, terminal 5, terminal 6 are supported H.323 standard, and terminal 3 and terminal 4 are supported H.320 standard.To MCU 2, MCU 2 is connected with MCU 1 by the E1 special line by the E1 private line access for terminal 3 and terminal 4.MCU 1, MCU 3, terminal 1, terminal 2, terminal 5, terminal 6 are interconnected by the IP operation bearer network.MCU 1, MCU 2, MCU 3 and conference management software are interconnected by the IP supervising the network.Conference management software can be controlled respectively three MCU, thereby session control function is provided.
According to the embodiment of the invention, a kind of implementation method of selection and watching of video also is provided, be used for realizing selection and watching of video at subtended conference.
Fig. 2 is the flow chart according to the implementation method of the selection and watching of video of the embodiment of the invention, as shown in Figure 2, for two MCU that are connected on the path of the video signal flow from the selected target terminal of seeing to viewing terminal: a MCU and the 2nd MCU, wherein, the one MCU is the MCU of above-mentioned video signal flow more close selected target terminal of seeing on the path, mainly may further comprise the steps (step S201-step S203) according to the implementation method of the selection and watching of video of the embodiment of the invention:
Step S201: order is seen in MCU receiver, video choosing;
Step S203: a MCU by and the 2nd MCU between the first cascade interface channel transmit the vision signal of target terminal to the 2nd MCU, wherein, the interface channel of setting up in advance between the one MCU and the 2nd MCU comprises: the first cascade interface channel and the second cascade interface channel, the second cascade interface channel are used for transmitting choosing and see vision signal.
In embodiments of the present invention, can to transmit the selection and watching of video signal in order making between the MCU at different levels, to divide timing at conferencing resource, need connect for setting up two cascades between the MCU at different levels, particularly, the foundation of subtended conference can may further comprise the steps:
In embodiments of the present invention, for each MCU through the path of the video signal flow from the selected target terminal of seeing to viewing terminal, the mode of the vision signal of its transmission target terminal is as follows:
(1) for the direct-connected MCU of viewing terminal, this MCU by and another MCU between be used to transmit the vision signal of cascade interface channel receiving target terminal that vision signal is seen in choosing, and the vision signal that receives is sent to viewing terminal;
(2) for the direct-connected MCU of target terminal, this MCU transmits choosing with the vision signal of target terminal by being used between the next MCU on itself and the path and sees that the cascade interface channel of vision signal sends to next MCU;
(3) for MCU that is in the connection viewing terminal in this path and the intergrade MCU between the MCU that is connected described target terminal, this MCU by and a last MCU between be used to transmit the vision signal of cascade interface channel receiving target terminal that vision signal is seen in choosing, and with the vision signal that receives by and next MCU between be used to transmit choosing and see that the cascade interface channel of vision signal passes to next MCU.
In embodiments of the present invention, selection and watching of video can adopt chairman's control mode or the outer director's control mode of band, below respectively this dual mode is described.
(1) chairman's control mode
Particularly, chairman's terminal can be sent the selection and watching of video request in video conference, and the video of certain target terminal is watched in request, specifically can may further comprise the steps:
Whether step 2 after current MCU receives the selection and watching of video request, checks target terminal at this MCU, if then execution in step 4, otherwise, execution in step 3;
Step 4, current MCU sends to a last MCU in chairman's terminal of the request of sending or the request path with the vision signal of target terminal, wherein, if current MCU sends to a last MCU in the request path with the vision signal of target terminal, then vision signal is to see what the vision signal interface channel transmitted by the choosing between a current MCU and the last MCU.
In specific implementation process, current MCU can carry out the conversion of video format as required.
And, current MCU is after receiving the selection and watching of video request, can send selection and watching of video success response message to chairman's terminal of the request of sending or the last MCU in the request path, perhaps, current MCU is at definite target terminal during at this MCU, send selection and watching of video success response message to chairman's terminal of the request of sending or the last MCU in the request path, for the MCU that receives success response message, when receiving success response message, this MCU transmits the selection and watching of video response message to a last MCU or chairman's terminal of request path, this MCU sees that from choosing the vision signal interface channel receives the vision signal that next MCU sends simultaneously, and transmits this vision signal to a last MCU or chairman's terminal of request path.
(2) the outer director's of band control
Promptly control by meeting control management module (can realize) by meeting control and management software, in embodiments of the present invention, the meeting control management module can directly be controlled each MCU in the path of definite object terminal, particularly, realize that by the meeting control management module selection and watching of video mainly may further comprise the steps:
The core concept of the implementation method of the selection and watching of video that the embodiment of the invention provides is to increase an additional cascade channel to transmit choosing and see vision signal, under the situation that does not change basic thought, the adjustment of top step adjustment or control method is all belonged to embodiment of the invention institute covering scope.
Implementation method for the above-mentioned selection and watching of video further understanding the embodiment of the invention and provided describes below by specific embodiment.
Fig. 3 is the connection topological relation schematic diagram of a subtended conference in the embodiment of the invention.Wherein, MCU 1 is main MCU, and MCU 2 and MCU 3 are from MCU.Connect according to the rules of regulation H.320 and H.323 between each terminal and the MCU.Set up 2 cascades between MCU 2 and the MCU 1 and connected, connection (205) is used for transmitting choosing and sees vision signal.Set up 2 cascades between MCU 3 and the MCU 1 and connected, connection (207) is used for transmitting choosing and sees vision signal.Terminal 1 and terminal 2 are connected to MCU 1, and terminal 3 and terminal 4 are connected to MCU 2, and terminal 5 and terminal 6 are connected to MCU 3.Two cascades between the MCU connect and have incidence relation, a kind of mode is to specify the incidence relation that connects by conference management software, and is handed down to each MCU.Also can bind incidence relation automatically according to the parameter that connects, for example mate incidence relation automatically according to the calling and called sign by MCU.
Embodiment one
Be controlled to be example with chairman's terminal in the present embodiment and describe, at present embodiment, terminal 1 is chairman's terminal, and, the video of this terminal 1 request viewing terminal 5.In the present embodiment, selection and watching of video operates in to meet H.323 and carries out in the standard device scope.
Fig. 4 is the interaction diagrams of present embodiment, and as shown in Figure 4, the video of terminal 1 request viewing terminal 5 mainly may further comprise the steps in the present embodiment:
Step 401, terminal 1 sends the selection and watching of video request message to MCU 1, the vision signal of request viewing terminal 5;
Step 402, MCU 1 receives above-mentioned selection and watching of video request, check to determine terminal 5 not on this MCU, transmits the selection and watching of video request message to the next MCU (being MCU 3) near terminal 5 more;
Step 403, MCU 3 receives the selection and watching of video request message of MCU 1, check to determine that terminal 5 is connected on this MCU, then starts the video route, sends to main MCU 1 from the vision signal that connects the terminal 5 that (212) receive and by connection (207);
Step 404, MCU 3 sends selection and watching of video success response message to MCU 1, and the execution of this step can be carried out simultaneously with step 403;
Step 405 after MCU 1 receives the selection and watching of video success response message of MCU 3, starts the video route, will send to terminal 1 by connecting (208) from the vision signal that connection (207) receives, and return selection and watching of video success response message to terminal 1.
Embodiment two
Still be controlled to be example with chairman's terminal in the present embodiment and describe, in the present embodiment, terminal 3 is chairman's terminal, the video of this terminal request viewing terminal 5.In the present embodiment, the selection and watching of video operation promptly relates to and meets the H.323 equipment of standard, relates to again to meet the H.320 equipment of standard.
Fig. 5 is the interaction diagrams of present embodiment, and as shown in Figure 5, the video of terminal 3 request viewing terminal 5 mainly may further comprise the steps in the present embodiment:
Step 501, terminal 3 sends the selection and watching of video request message to MCU 2, the vision signal of request viewing terminal 5;
Step 502, MCU 2 checks and determines terminal 5 not on this MCU, transmits the selection and watching of video request message to the next MCU (being MCU 1) near terminal 5 more;
Step 503, MCU 2 starts the video route immediately, from connecting (205) receiving video signals and giving terminal 3 by connecting (210) forwarding;
Because H.320 the selection and watching of video request message in the standard does not have corresponding response message, therefore, MCU 2 starts the video route immediately after receiving the selection and watching of video request message;
In specific implementation process, also can adopt another kind of optionally method, promptly define privately owned extended message, in system H.320, also can realize request-response message mechanism H.323.
Step 504, MCU 1 receives the selection and watching of video request message of MCU 2, check to determine terminal 5 not on this MCU, sends the selection and watching of video request messages to the next MCU 3 near terminal 5 more;
Step 505, MCU 3 receives the selection and watching of video request message of MCU 1, checks and determines that terminal 5 is connected on this MCU, will send to main MCU 1 by connecting (207) from the vision signal that connects the terminal of (212) receiving 5;
Step 506, MCU 3 sends selection and watching of video success response message to MCU 1, and this step can be carried out simultaneously with above-mentioned steps 505;
Step 507 after MCU 1 receives the selection and watching of video success response message of MCU 3, starts the video route, will send to MCU 2 by connecting (205) from the vision signal that connection (207) receives.
Embodiment three
In the present embodiment, control by meeting control management module (being meeting control and management software).In the present embodiment, terminal 3 needs choosing to see the video of terminal 5.
Fig. 6 is for realizing the flow chart of selection and watching of video by the meeting control management module in the present embodiment, as shown in Figure 6, the meeting control management module determines that from terminal 5 to terminal 3 video signal flow comprises MCU 3, MCU 1 and MCU 2 through the path, then send the selection and watching of video order to these three MCU respectively, terminal 3 choosings in the present embodiment see that the video of terminal 5 mainly may further comprise the steps:
Step 601, the meeting control management module sends the selection and watching of video orders to MCU 3, requires MCU 3 to send to main MCU 1 by connection (207) from the vision signal that connects the terminal 5 that (212) receive;
Step 602 is after MCU 3 receives the selection and watching of video order, sending to main MCU 1 from the vision signal that connects the terminal of (212) receiving 5 by connecting (207);
Step 603, the meeting control management module sends the selection and watching of video order to MCU 1, requires MCU 1 to send to MCU 2 by connecting (205) from the vision signal that connection (207) receives;
Step 604 after MCU 1 receives the selection and watching of video order, sends to MCU 2 to the vision signal that receives from connection (207) by connecting (205);
Step 605, the meeting control management module sends the selection and watching of video order to MCU 2, requires MCU 2 to send to terminal 3 by connecting (210) from the vision signal that connection (205) receives;
Step 606, after MCU 2 received the selection and watching of video order, the vision signal that connection (205) is received sent to terminal 3 by connecting (210).
Fig. 7 sees video transmit path schematic diagram according to a kind of choosing of the embodiment of the invention, and in Fig. 7, the video of terminal 5 is seen in terminal 3 choosings, and the video of terminal 6 is broadcast to other all terminals.Filled arrows is represented the approach that the vision signal of terminal 6 is flowed through among the figure, and hollow arrow is represented the approach that the vision signal of terminal 5 is flowed through.As can be seen from this figure, broadcast video and choosing see that can there be resource contention in video.
As mentioned above, the technical scheme that provides by the embodiment of the invention, connect by between each MCU, setting up two cascades, when selection and watching of video, each MCU on the path connects the vision signal of transmitting target terminal by one of them cascade, make certain terminal can select the vision signal of seeing other terminal arbitrarily, and can not influence the vision signal of watching of other terminal, strengthened the selection and watching of video operating function of video conference, overcome the current video conference system and under subtended conference, selected the situation that some terminal may be failed of seeing, thereby can promote user experience, improve the meeting safeguard level.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the implementation method of a selection and watching of video, be used for realizing selection and watching of video at subtended conference, it is characterized in that, for two the multipoint control unit MCU that are connected on the path of the video signal flow from the selected target terminal of seeing to viewing terminal: a MCU and the 2nd MCU, described method comprises:
A MCU who receives the selection and watching of video order by and the 2nd MCU between the second cascade interface channel transmit the selected vision signal of seeing target terminal to described the 2nd MCU, wherein, the interface channel of setting up in advance between a described MCU and described the 2nd MCU comprises: the first cascade interface channel and the second cascade interface channel, the described second cascade interface channel are used for transmitting choosing and see vision signal.
2. method according to claim 1 is characterized in that, if described the 2nd MCU is the MCU that is connected with viewing terminal, then described method also comprises:
Described the 2nd MCU will send to described viewing terminal from the vision signal from a described MCU that the described second cascade interface channel receives.
3. method according to claim 1, it is characterized in that, if a described MCU is the intergrade MCU between MCU that connects viewing terminal and the MCU that is connected described target terminal, a then described MCU comprises to the vision signal that described the 2nd MCU transmits described target terminal:
A described MCU by and the 3rd MCU between the vision signal that receives of the second cascade interface channel from described the 3rd MCU;
A described MCU by and described the 2nd MCU between the second cascade interface channel vision signal that receives is sent to described the 2nd MCU;
Wherein, in the path of described target terminal, described the 3rd MCU is the MCU than the more close described target terminal of a described MCU in described viewing terminal, and described the 2nd MCU is the MCU than the more close described viewing terminal of a described MCU.
4. according to each described method in the claim 1 to 3, it is characterized in that, the described selection and watching of video order that a described MCU receives is from viewing terminal or from described the 2nd MCU, wherein, carry the identification information of the selected described target terminal of seeing in the described selection and watching of video order, then after receiving described selection and watching of video order, described method also comprises:
A described MCU detects described target terminal and whether is connected a described MCU, if, then the vision signal with described target terminal passes to the described viewing terminal that sends described selection and watching of video order, or the vision signal of described target terminal is sent to described the 2nd MCU by second cascade channel; Otherwise
A described MCU transmits described selection and watching of video order to the next MCU that points to described target terminal path.
5. method according to claim 4 is characterized in that, a described MCU is after receiving described selection and watching of video order, and described method also comprises:
A described MCU sees successfully response message to described viewing terminal that sends described selection and watching of video order or described the 2nd MCU transmission choosing.
6. according to each described method in the claim 1 to 3, it is characterized in that,
The described selection and watching of video order that a described MCU receives is from the meeting control management module, wherein, described selection and watching of video order is used to indicate a described MCU to be forwarded to the next output that connects from an one interface channel receiving video signals and with described vision signal;
After a then described MCU received described selection and watching of video order, described method also comprised:
A described MCU carries out the transmission of vision signal according to described selection and watching of video order.
7. method according to claim 6 is characterized in that, before a described MCU received described selection and watching of video order from described meeting control management module, described method also comprised:
Described meeting control management module calculates video signal flow from described target terminal to viewing terminal through the path;
Described meeting control management module sends described selection and watching of video order to described video signal flow each MCU in the path.
8. a video conferencing system is characterized in that, comprising: one or more MCU, one or more terminal, wherein,
Each terminal communicates with a MCU respectively by network;
Establish two cascades between every couple of MCU of the superior and the subordinate and connect, one of them cascade connects to be used for transmitting selecting sees vision signal, when receiving the selection and watching of video order, connects the vision signal of transmitting target terminal by this cascade between every couple of MCU of the superior and the subordinate.
9. system according to claim 8 is characterized in that, comprises in described one or more terminals that chairman's terminal, described chairman's terminal are used for sending the selection and watching of video order to connected MCU.
10. system according to claim 8 is characterized in that, described system also comprises: the meeting control management module, be connected with each MCU respectively, be used for calculating from
The selected target terminal of seeing arrives the video signal flow of viewing terminal through the path, and sends selection and watching of video order to described video signal flow each MCU in the path.
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