CN101742223A - Intelligent video stream bandwidth regulating method - Google Patents
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Abstract
The invention discloses an intelligent video stream bandwidth regulating method. The method comprises the following steps of: setting a conferee video encoding main control end during a conference, selecting a conference template for the main control end and setting overall resolution for the selected template; regulating full-automatic encoding video bandwidth of the conference template, namely when a conferee needs encoding a broadcast video, allowing the conferee to intelligently select the magnitude of an encoding broadcast video stream bandwidth according to a host conference template and a host conference terminal available network bandwidth; and regulating a full-automatic received video bandwidth of the conference template, namely allowing the conferee to intelligently select the magnitude of a received decoding video stream bandwidth according to the conference template. The balance among the conference template, the network bandwidth and the video definition can be achieved and the video image quality can be maximized, so that the overall performance of a video conference system is improved.
Description
Technical field
The invention belongs to the audio frequency and video technical field, relate to a kind of bandwidth adjustment method, relate in particular to a kind of intelligent video stream bandwidth regulating method.
Background technology
Usually, comprised video interconnection between a plurality of Conference Rooms in the network teleconference system.Therefore, for a certain particular video conference terminal (participant), it can receive the video flowing of multichannel from same other participants of meeting, simultaneously, itself also can broadcast more than one the tunnel video flowing of (normally two-way, video camera input video and screen input video).The multi-path video stream of these input and output will consume a large amount of network bandwidth resources, and the demand of bandwidth is increased and increases along with the video way that inserts or broadcast.Yet in actual the use, the network bandwidth size that offers this video conference terminal use generally has a upper limit.In addition, along with the development of 3G, satellite network, IP fixed network with popularize, people begin to wish that the various terminals with different decoding capabilities and display resolution size that will comprise PC, notebook, mobile phone, PDA, smart phone, net book etc. are linked in the unified video conferencing system.Therefore, the task of a key of video conferencing system is to regulate resolution, frame per second, the code check size (being video stream bandwidth) of optimizing each road video flowing at the decoding and the display capabilities of available network bandwidth size and terminal self, to guarantee that each road video all is in optimum efficiency, the overall performance of elevator system in the meeting.
Some disclosed documents have been introduced the video bandwidth control method.
Provide a kind of video bandwidth adaptation method and device as Chinese patent CN200710119573, described method comprises: calculate the bit budget value on the different levels of coding structure; Obtain the linear relationship between the bit budget value and maximum run length in the video scene; Obtain the relation between the maximum run length and quantization parameter in the video scene; According to linear relationship between bit budget value of obtaining and the maximum run length and the relation between maximum run length and the quantization parameter, with video compression sign indicating number speed control within described bit budget value.
Chinese patent CN200810199034 provides the control method of bandwidth in the video transmission for another example, detect the initial strip tolerance of client to the data relay device, described initial strip tolerance is the bandwidth capacity of described client before described data relay device is initiated the video connection; Detect described client to the actual bandwidth capacity of described data relay device, described actual bandwidth capacity is described client and the described data relay device bandwidth capacity when being in connection status; As the current bandwidth capacity, described data relay device sends data according to described current bandwidth capacity to described client with the minimum value of described actual bandwidth capacity and described initial strip tolerance.
And for example Chinese patent CN200910002811 provides a kind of band width control method based on video conference, device, terminal and system, and described method comprises: conference control equipment is set up to call out with circuit network terminal and packet network terminal respectively and is connected; Described conference control equipment determines that described packet network bandwidth does not satisfy the requirement of packet network video Data Transmission, then notifies described circuit network terminal to carry out code stream control, to reduce circuit network video Data Transmission speed.
When above-mentioned patent has proposed that the participant participates in video conference in many ways, each participant can select to be suitable for the method for big or small video code flow automatically according to self available network bandwidth, but do not consider how same participant is the size of each road video selection video code flow of same participant when receiving multi-channel video, guaranteeing that each road obtains optimum image effect, thereby promote the video conference overall performance.
" Streaming Media intelligence is regulated and Control Study " paper is at web-based teaching video information transmission requirements, some key technologies such as the related Streaming Media coding of video transmission, network bandwidth self adaptive are studied. adopt two kinds of methods that technology combines, realized the intelligence of Streaming Media is regulated and control, solved under the Internet network environment problems such as long-range asynchronous Teaching transmission of Information stability.
" optimisation strategy that network bandwidth resources is utilized in the transmission of multi-channel video monitor message " paper is at the characteristics of special line for passenger trains transportation safety supervisory control system, the multi-channel video real-time Transmission optimal strategy problem of research under the network bandwidth resources confined condition, a kind of video flowing Rate Control and network congestion avoidance mechanism of gathering in real time based on the source-end networks flow proposed. set up flow control model based on this system configuration, use Theory of Automatic Control, to derive stable flow rate and regulate algorithm. the fair principle to bandwidth resource allocation is expanded, by video source " priority " is set, realize the algorithm of " as required " dynamic self-adapting adjusting of the network bandwidth; Introduce self adaptation modifying factor β and γ simultaneously, bandwidth usage α to every road video flowing dynamically revises according to regulating error. and test data shows, this congestion avoidance policy can reach 97.4% to the bandwidth availability ratio of network bottleneck part, and the adjusting time is about 5ms.
" a kind of improved gradable video encoding method and Network Transmission research thereof " paper has proposed a kind of improved gradable video encoding method. in order to adapt to the Delamination Transmission requirement of Streaming Media; this method is by producing the enhancement layer part of video flowing to the Bit-Plane Encoding of DCT coefficient quantization residual error; its basic layer bit stream is made up of more this layer of subbase; each this layer of subbase is reset by macro-block level DCT coefficient and the VLC reorganization generates. simultaneously; a kind of Network Transmission self adaptation at this layered video flow data that designed this article does not wait heavy packet loss protection (AUPLP) strategy; estimating on the current basis that utilizes bandwidth resources; adjust different layers Data Protection dynamics in real time; and the control transmission number of plies of blocking. simulation result shows; compare this article scheme can obtain average 1.2dB when low bandwidth coding gain with conventional method, the application of AUPLP has also improved the transmission quality of video stream media greatly.
When above-mentioned paper has all only been considered at single passage video transmission at the dynamic adjustment of finite element network bandwidth, normally adopt a certain algorithm to calculate the available network bandwidth size in real time, reduce encoder bit rate then with the dynamically adapting network bandwidth, equilibrium relation when not considering the multi-channel video transmission between each passage video, promptly how to guarantee to obtain separately the optimum image effect, thereby promote overall performance.
Summary of the invention
Technical problem to be solved by this invention is: a kind of intelligent video stream bandwidth regulating method is provided, can be according to the template resolution sizes, for the subwindows of a plurality of different sizes in the different meeting templates in the video conference calculate original resolution automatically and are that subwindow is selected best big or small encoded broadcast or decoding and displaying video flowing according to the subwindow original resolution that calculates institute, can reach the balance between meeting template, the network bandwidth, the video definition, maximization video image quality, thereby the overall performance of lifting video conferencing system.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of intelligent video stream bandwidth regulating method, this method comprises the steps:
A, setting participant's video coding main control end in meeting, is that main control end is selected the meeting template, and sets total resolution for the template of selecting;
B, meeting template full automatic coding video bandwidth regulating step; When the participant needed the encoded broadcast video, the participant was according to host's meeting template and host's conference terminal available network bandwidth Intelligence Selection encoded broadcast video stream bandwidth size;
C, the full-automatic receiver, video bandwidth adjustment of meeting template step; The participant receives the decoded video streams amount of bandwidth according to meeting template Intelligence Selection.
As a preferred embodiment of the present invention, among the step B, the current video streaming is during to a certain window, at first calculates the resolution of this window correspondence according to main control end meeting template and template total resolution, is referred to as subwindow resolution;
Secondly, calculate the corresponding available network bandwidth of each window in the template, be referred to as the subwindow available network bandwidth according to the proportional meter of main control end available network bandwidth and shared all the video broadcasting window resolution size summations of this window resolution size;
At last, flow the resolution and the code check of place subwindow resolution and the definite coding of available network bandwidth current video according to current video.
As a preferred embodiment of the present invention, current video is once encoded and is produced main flow, son stream, grandson's stream simultaneously, the main flow resolution of each road video flowing is subwindow resolution, the main flow resolution sizes: son stream resolution sizes: grandson flows resolution sizes=16: 4: 1; The code stream size sum of main flow, son stream, grandson's stream is the subwindow available network bandwidth, main flow code stream size: son stream code stream size: grandson flows code stream size=16: 4: 1.
As a preferred embodiment of the present invention, it is one or more that step C comprises the following steps:
C1, if the participant selected reception high code stream or middle code stream or low code stream, then all subwindows will receive high code stream, middle code stream or low code stream video flowing respectively by window size grade separately in participant's meeting template, wherein, high code stream, middle code stream, low code stream have been represented high-resolution and high frame per second, intermediate resolution and medium frame per second, low resolution and low frame per second respectively;
C2, if the participant has set the total resolution of local meeting template, full-automatic reception will calculate this window subwindow resolution in the template according to the total resolution that template and local meeting template are discussed in this locality, contrast the resolution sizes of this road video main flow, son stream, grandson's stream then, select a hithermost reception of size;
C3, if the participant adopts the meeting template of main control end acquiescence to select video flowing, will be that main flow, the son that window distributes different resolution size and frame per second size in the template flows, grandson flows automatically.
As a preferred embodiment of the present invention, the resolution sizes that meeting template total resolution is set has comprised 8 groups, is respectively 16: 9 widescreen template and 4: 3 conventional template; The widescreen template comprises: 1920*1080,1280*720,960*540,640*360, conventional template comprises: 1280*1024,1024*768,800*600,640*480.Described method can be set: the user can only select the resolution of above 8 groups of standards, can not set other.
As a preferred embodiment of the present invention, described method also comprises the step that locking receives stream; Even the participant has selected locking to receive stream and has then locked main flow, son stream, the grandson's stream that receives voluntarily, and video flowing is dragged to other windows from a window can not change receiving mode; Otherwise video flowing is dragged to other any one windows from a window will be by the resolution changing receiving mode according to new window.
As a preferred embodiment of the present invention, described method also comprises the step of calculating and display conference total bandwidth.Promptly to the participant, take total bandwidth with calculating the video that receives total bandwidth and send according to all video flowings that receive and send respectively, and adopt 5 seconds of transparent color font display reminding.
As a preferred embodiment of the present invention, described method also comprises restriction participant encoded broadcast single channel video available network bandwidth.If a weight is then set in restriction, only allowing single channel video available network bandwidth is the part of total available network bandwidth, and for example, setting weight is 3/5, and then this road video code flow maximum can only be set to 3/5 of total bandwidth; Otherwise, allow the single channel video freely to set the code stream size, for example: total bandwidth is 2M, the code stream that this road video coding bandwidth of freely setting is automatically calculated is xM, other video occupied bandwidths are (2-x) M, if artificially set this road video code flow this moment is y, then meeting total bandwidth is (2-x+y) M.
Beneficial effect of the present invention is: the intelligent video stream bandwidth regulating method that the present invention proposes, adopted intelligent video stream bandwidth regulation technology based on the meeting template, at different video conference template types, taken all factors into consideration meeting template window size, conference terminal physical resolution size and terminal available network bandwidth size, be video window Intelligence Selection best video stream bandwidth not of uniform size in the video conference, make under the restriction of available network bandwidth size altogether, video window (corresponding one road video of each window) not of uniform size in the video conference is asked for as required, obtained to be fit to the video flowing of own resolution separately, the video that the big window that having avoided imposes uniformity without examining individual cases is caused receives is too little, the problem that the video that wicket receives is too big has guaranteed heterogeneous networks bandwidth in the same video conferencing system, and between the user of different display resolution sizes video image the smoothness transmission and obtain the best video effect separately.Practical application is found, based on the intelligent video stream bandwidth regulating method of meeting template can well balance meeting template, relation between the available network bandwidth, video definition, bring into play the effect of the network bandwidth to greatest extent, for each road video provides best video image quality, and then promoted the user experience of whole video conference system.
Description of drawings
Fig. 1 regulates key step based on meeting template intelligent video stream bandwidth
Fig. 2 regulates schematic flow sheet for meeting template full automatic coding intelligent video stream bandwidth.
Fig. 3 regulates schematic flow sheet for the full-automatic receiver, video stream of meeting template bandwidth intelligence.
Fig. 4 is 6 split screen meeting templates.
Fig. 5 is 8 split screen meeting templates.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Embodiment one
The present invention has disclosed a kind of intelligent video stream bandwidth regulating method based on the video conference template.This method is according to the template resolution sizes, for the subwindows of a plurality of different sizes in the different meeting templates in the video conference calculate original resolution automatically and are that subwindow is selected best big or small encoded broadcast or decoding and displaying video flowing according to the subwindow original resolution that calculates institute, can reach the balance between meeting template, the network bandwidth, the video definition, maximization video image quality, thereby the overall performance of lifting video conferencing system.
See also Fig. 1 to Fig. 3, the intelligent video stream bandwidth regulating method based on the meeting template of the present invention has comprised following key step:
1, sets the meeting main control end, select the meeting template and set the template total resolution, start the intelligent video stream bandwidth regulatory function;
2, the participant is according to meeting template and available network bandwidth Intelligence Selection encoded broadcast video stream bandwidth size;
3, the participant receives the decoded video streams amount of bandwidth according to meeting template Intelligence Selection.
Below specifically introduce each step.
The first step, setting a participant in meeting is the video coding main control end, and is main control end selection meeting template, and sets total resolution for the template of selecting, and starts the intelligent video stream bandwidth regulatory function.Wherein, choosing of main control end can be any one participant's terminal, and we select the host as main control end usually; Meeting template commonly used has comprised 2 split screens, 4 split screens, 5 split screens, 6 split screens, 8 distribution, 9 distribution, 10 distribution, 12 split screens, 16 split screens etc.Usually, be accustomed to selecting a kind of meeting template by the user, what we supposed to select here is 1,2,3,4,5,6, and the other types template can be analogized; Set the total resolution of meeting template; Open meeting template full automatic coding function, and the indexed variable that will open meeting template full automatic coding function is changed to very and is stored in the system.The resolution sizes that meeting template total resolution can be set has comprised 8 groups, be respectively that widescreen (16: 9) comprising: 1920*1080,1280*720,960*540,640*360, and conventional (4: 3) comprising: 1280*1024,1024*768,800*600,640*480.The user can only select the resolution of above 8 groups of standards, can not set other.
In second step, the participant is according to meeting template and available network bandwidth Intelligence Selection encoded broadcast video stream bandwidth size.Referring to Fig. 2, this step is divided into following substep:
Step 2-1, obtain the main control end available network bandwidth.Generally there is dual mode to obtain.The one, by user's input, but adopt certain algorithm to calculate (technology how to obtain available network bandwidth is not at this patent protection range and so on, so do not do detailed argumentation) automatically by system.
Step 2-2, calculate video flowing place subwindow resolution according to main control end meeting template and template total resolution.Here we suppose that the template total resolution of setting is 1920*108, and other resolution can be analogized.With reference to Fig. 4, because the meeting template is 6 split screens, total resolution is 1920*1080, and the resolution that therefore can calculate subwindow 1,2,3,4,5,6 is distinguished as 1280*720,640*360,640*360,640*360,640*360,640*360.Suppose that with the current video streaming to 1 work song window, then 1 work song window resolution is 1280*720.
Step 2-3, according to subwindow resolution and current all video broadcasting window resolution size summation meter operator window available network bandwidth.
Here we suppose that the total available bandwidth of setting of main control end is 2Mbps, and other resolution can be analogized.At this moment, suppose that current video is a first via video, at this moment, the subwindow available network bandwidth is 2Mbps.If broadcasted one road video (supposing that broadcasting is at 2 work song windows), be that current video is the second road video, the available network bandwidth=2*R=1.8 of then current 1 work song window (Mbps), wherein R=(1280*720)/(1280*720+640*360)=0.9.Current video is a Third Road, the four tunnel ... during video, the computational methods of its subwindow available network bandwidth are similar when being the second the tunnel with it.
Step 2-4, according to the relation of resolution and code check between subwindow resolution and available network bandwidth size and main flow, son stream, the grandson's stream, determine that video flowing main flow, son stream, grandson flow resolution, code check size.
End to step 2-3, having obtained subwindow resolution is that 1280*720, available network bandwidth are 2Mbps.Main flow, son stream, grandson flow and have represented high-resolution and high frame per second, intermediate resolution and medium frame per second, low resolution and low frame per second code stream usually successively, and can adopt certain strategy usually is that main flow resolution, son stream resolution or grandson flow resolution with the subwindow resolution setting.Here for simply, we are made as main flow resolution with subwindow resolution.According to the resolution main flow: son stream: grandson's stream=16: 4: 1; The code stream size sum of main flow, son stream, Sun Liuzong is the subwindow available network bandwidth, code stream size main flow: son stream: grandson's stream=16: 4: 1 rule, video flowing main flow, the son that can calculate this subwindow flows, the resolution of grandson's stream is respectively 1280*720,640*360,320*180, and the code check of main flow, son stream, grandson's stream is about 1.5Mbps, 0.376Mbps, 0.096Mbps (adjustment of can rounding off slightly) respectively on 16: 4: 1 ratio basis.
Step 2-5, participant's video terminal flow resolution, the broadcasting of code check size coding according to the video flowing main flow that calculates at last, son stream, grandson.
In the 3rd step, the participant receives the decoded video streams amount of bandwidth according to meeting template Intelligence Selection.
Suppose that the participant has adopted 8 split screen meeting templates as shown in Figure 5, and the hypothesis participant need receive the video of broadcasting on main control end 1 work song window on No. 1 screen.With reference to Fig. 3, the selection that No. 1 screen of participant is gone up the video stream bandwidth size is divided into following substep:
Step 3-1, if the participant has selected reception high code stream or middle code stream or low code stream, then all subwindows will receive high code stream, middle code stream or low code stream video flowing respectively by window size grade separately in participant's meeting template.Wherein, high code stream, middle code stream, low code stream have been represented high-resolution and high frame per second, intermediate resolution and medium frame per second, low resolution and low frame per second respectively.In the time of specific implementation, can for window in the template in the window size ratio be divided into " greatly ", " in ", window in " little " three, and be that each subwindow is set an order of magnitude.For example, in template shown in Figure 5, we set No. 1 window is that big window, other windows are window in wicket, the nothing.At this moment,, can obtain 1 work song window and need obtain a high-resolution and high frame rate image, the corresponding main flow that should receive the video of broadcasting on main control end 1 work song window according to the above-mentioned rule of obtaining the subwindow video resolution.Otherwise change step step 3-2.
Step 3-2, if the participant has set the total resolution of local meeting template, the resolution that full-automatic receiving function will calculate video on the template window according to the resolution that the local template of participant is set contrasts the main flow after the host sets then, son stream, the resolution of grandson's stream is selected a hithermost reception of parameter.For example, suppose that the total resolution that the participant sets local meeting template is 800*600, with reference to Fig. 5, because the meeting template is 8 split screens, the resolution that therefore can calculate subwindow 1,2,3,4,5,6,7,8 is distinguished as 600*450,200*150,200*150,200*150,200*150,200*150,200*150,200*150.(they are respectively 1280*720,640*360,320*180 to the resolution sizes of the main flow of the video of broadcasting on main control end 1 work song window that needs are received, son stream, grandson's stream, referring to step 2-4), can determine that video flowing resolution should be selected 640*360 on No. 1 screen of participant, the promptly corresponding son stream that should receive the video of broadcasting on main control end 1 work song window.If the participant sets the total resolution of other local meeting template, the selection and the said method of its subwindow video flowing size are similar.Otherwise change step step 3-3.
Step 3-3, participant adopt the meeting template of main control end acquiescence to select video flowing, will be main flow, son stream, the grandson's stream that window distributes different resolution size and frame per second size in the template automatically.
In sum, the intelligent video stream bandwidth regulating method that the present invention proposes based on the meeting template, adopted intelligent video stream bandwidth regulation technology based on the meeting template, at different video conference template types, taken all factors into consideration meeting template window size, conference terminal physical resolution size and terminal available network bandwidth size, be video window Intelligence Selection best video stream bandwidth not of uniform size in the video conference, make under the restriction of available network bandwidth size altogether, video window (corresponding one road video of each window) not of uniform size in the video conference is asked for as required, obtained to be fit to the video flowing of own resolution separately, the video that the big window that having avoided imposes uniformity without examining individual cases is caused receives is too little, the problem that the video that wicket receives is too big has guaranteed heterogeneous networks bandwidth in the same video conferencing system, and between the user of different display resolution sizes video image the smoothness transmission and obtain the best video effect separately.Practical application is found, based on the intelligent video stream bandwidth regulating method of meeting template can well balance meeting template, relation between the available network bandwidth, video definition, bring into play the effect of the network bandwidth to greatest extent, for each road video provides best video image quality, and then promoted the user experience of whole video conference system.
Embodiment two
Disclose a kind of intelligent video stream bandwidth regulating method in the present embodiment, this method comprises the steps:
A, setting participant's video coding main control end in meeting, is that main control end is selected the meeting template, and sets total resolution for the template of selecting.
B, meeting template full automatic coding video bandwidth regulating step; When the participant needed the encoded broadcast video, the participant was according to host's meeting template and host's conference terminal available network bandwidth Intelligence Selection encoded broadcast video stream bandwidth size.
C, the full-automatic receiver, video bandwidth adjustment of meeting template step; The participant receives the decoded video streams amount of bandwidth according to meeting template Intelligence Selection.
Among the step B, the current video streaming is during to a certain window, at first calculates the resolution of this window correspondence according to main control end meeting template and template total resolution, is referred to as subwindow resolution;
Secondly calculate the corresponding available network bandwidth of each window in the template according to the proportional meter of main control end available network bandwidth and shared all the video broadcasting window resolution size summations of this window resolution size, be referred to as the subwindow available network bandwidth;
At last, flow the resolution and the code check of place subwindow resolution and the definite coding of available network bandwidth current video according to current video;
Current video is once encoded and produced main flow, son stream, grandson's stream simultaneously, and the main flow resolution of each road video flowing is subwindow resolution, the main flow resolution sizes: son stream resolution sizes: grandson flows resolution sizes=16: 4: 1; The code stream size sum of main flow, son stream, grandson's stream is the subwindow available network bandwidth, main flow code stream size: son stream code stream size: grandson flows code stream size=16: 4: 1;
It is one or more that step C comprises the following steps:
C1, if the participant selected reception high code stream or middle code stream or low code stream, then all subwindows will receive high code stream, middle code stream or low code stream video flowing respectively by window size grade separately in participant's meeting template, wherein, high code stream, middle code stream, low code stream have been represented high-resolution and high frame per second, intermediate resolution and medium frame per second, low resolution and low frame per second respectively;
C2, if the participant has set the total resolution of local meeting template, full-automatic reception will calculate this window subwindow resolution in the template according to the total resolution that template and local meeting template are discussed in this locality, contrast the resolution sizes of this road video main flow, son stream, grandson's stream then, select a hithermost reception of size;
C3, if the participant adopts the meeting template of main control end acquiescence to select video flowing, will be that main flow, the son that window distributes different resolution size and frame per second size in the template flows, grandson flows automatically.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to disclosed embodiment.
Claims (9)
1. an intelligent video stream bandwidth regulating method is characterized in that, this method comprises the steps:
A, setting participant's video coding main control end in meeting, is that main control end is selected the meeting template, and sets total resolution for the template of selecting;
B, meeting template full automatic coding video bandwidth regulating step; When the participant needed the encoded broadcast video, the participant was according to host's meeting template and host's conference terminal available network bandwidth Intelligence Selection encoded broadcast video stream bandwidth size;
C, the full-automatic receiver, video bandwidth adjustment of meeting template step; The participant receives the decoded video streams amount of bandwidth according to meeting template Intelligence Selection.
2. intelligent video stream bandwidth regulating method according to claim 1 is characterized in that:
Among the step B, the current video streaming is during to a certain window, at first calculates the resolution of this window correspondence according to main control end meeting template and template total resolution, is referred to as subwindow resolution;
Secondly, calculate the corresponding available network bandwidth of each window in the template, be referred to as the subwindow available network bandwidth according to the proportional meter of main control end available network bandwidth and shared all the video broadcasting window resolution size summations of this window resolution size;
At last, flow the resolution and the code check of place subwindow resolution and the definite coding of available network bandwidth current video according to current video.
3. intelligent video stream bandwidth regulating method according to claim 2 is characterized in that:
Current video is once encoded and produced main flow, son stream, grandson's stream simultaneously, and the main flow resolution of each road video flowing is subwindow resolution, the main flow resolution sizes: son stream resolution sizes: grandson flows resolution sizes=16: 4: 1;
The code stream size sum of main flow, son stream, grandson's stream is the subwindow available network bandwidth, main flow code stream size: son stream code stream size: grandson flows code stream size=16: 4: 1.
4. intelligent video stream bandwidth regulating method according to claim 1 is characterized in that:
It is one or more that step C comprises the following steps:
C1, if the participant selected reception high code stream or middle code stream or low code stream, then all subwindows will receive high code stream, middle code stream or low code stream video flowing respectively by window size grade separately in participant's meeting template, wherein, high code stream, middle code stream, low code stream have been represented high-resolution and high frame per second, intermediate resolution and medium frame per second, low resolution and low frame per second respectively;
C2, if the participant has set the total resolution of local meeting template, full-automatic reception will calculate this window subwindow resolution in the template according to the total resolution that template and local meeting template are discussed in this locality, contrast the resolution sizes of this road video main flow, son stream, grandson's stream then, select a hithermost reception of size;
C3, if the participant adopts the meeting template of main control end acquiescence to select video flowing, will be that main flow, the son that window distributes different resolution size and frame per second size in the template flows, grandson flows automatically.
5. intelligent video stream bandwidth regulating method according to claim 1 is characterized in that:
The resolution sizes that meeting template total resolution is set has comprised 8 groups, is respectively 16: 9 widescreen template and 4: 3 conventional template;
The widescreen template comprises: 1920*1080,1280*720,960*540,640*360, conventional template comprises: 1280*1024,1024*768,800*600,640*480.
6. intelligent video stream bandwidth regulating method according to claim 1 is characterized in that:
Described method also comprises the step that locking receives stream; If the participant has selected locking to receive stream and then locked main flow, son stream, the grandson's stream that receives voluntarily, video flowing is dragged to other windows from a window can not change receiving mode; Otherwise video flowing is dragged to other any one windows from a window will be by the resolution changing receiving mode according to new window.
7. intelligent video stream bandwidth regulating method according to claim 1 is characterized in that:
Described method also comprises the step of calculating and display conference total bandwidth; To the participant, take total bandwidth with calculating the video that receives total bandwidth and send according to all video flowings that receive and send respectively, and adopt transparent color font display reminding some seconds.
8. intelligent video stream bandwidth regulating method according to claim 1 is characterized in that:
Described method also comprises restriction participant encoded broadcast single channel video available network bandwidth;
If a weight is then set in restriction, only allowing single channel video available network bandwidth is the part of total available network bandwidth; Otherwise, allow the single channel video freely to set the code stream size.
9. an intelligent video stream bandwidth regulating method is characterized in that, this method comprises the steps:
A, setting participant's video coding main control end in meeting, is that main control end is selected the meeting template, and sets total resolution for the template of selecting;
B, meeting template full automatic coding video bandwidth regulating step; When the participant needed the encoded broadcast video, the participant was according to host's meeting template and host's conference terminal available network bandwidth Intelligence Selection encoded broadcast video stream bandwidth size;
C, the full-automatic receiver, video bandwidth adjustment of meeting template step; The participant receives the decoded video streams amount of bandwidth according to meeting template Intelligence Selection;
Among the step B, the current video streaming is during to a certain window, at first calculates the resolution of this window correspondence according to main control end meeting template and template total resolution, is referred to as subwindow resolution;
Secondly calculate the corresponding available network bandwidth of each window in the template according to the proportional meter of main control end available network bandwidth and shared all the video broadcasting window resolution size summations of this window resolution size, be referred to as the subwindow available network bandwidth;
At last, flow the resolution and the code check of place subwindow resolution and the definite coding of available network bandwidth current video according to current video;
Current video is once encoded and produced main flow, son stream, grandson's stream simultaneously, and the main flow resolution of each road video flowing is subwindow resolution, the main flow resolution sizes: son stream resolution sizes: grandson flows resolution sizes=16: 4: 1; The code stream size sum of main flow, son stream, grandson's stream is the subwindow available network bandwidth, main flow code stream size: son stream code stream size: grandson flows code stream size=16: 4: 1;
It is one or more that step C comprises the following steps:
C1, if the participant selected reception high code stream or middle code stream or low code stream, then all subwindows will receive high code stream, middle code stream or low code stream video flowing respectively by window size grade separately in participant's meeting template, wherein, high code stream, middle code stream, low code stream have been represented high-resolution and high frame per second, intermediate resolution and medium frame per second, low resolution and low frame per second respectively;
C2, if the participant has set the total resolution of local meeting template, full-automatic reception will calculate this window subwindow resolution in the template according to the total resolution that template and local meeting template are discussed in this locality, contrast the resolution sizes of this road video main flow, son stream, grandson's stream then, select a hithermost reception of size;
C3, if the participant adopts the meeting template of main control end acquiescence to select video flowing, will be that main flow, the son that window distributes different resolution size and frame per second size in the template flows, grandson flows automatically.
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