CN102685472A - Method, device and system of data transmission - Google Patents
Method, device and system of data transmission Download PDFInfo
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- CN102685472A CN102685472A CN2011100557929A CN201110055792A CN102685472A CN 102685472 A CN102685472 A CN 102685472A CN 2011100557929 A CN2011100557929 A CN 2011100557929A CN 201110055792 A CN201110055792 A CN 201110055792A CN 102685472 A CN102685472 A CN 102685472A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/154—Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/124—Quantisation
Abstract
The invention discloses a method of video data transmission. The method includes acquiring video data; determining a first encoding parameter according to preset threshold values of video quality evaluation parameters and the video data; encoding the video data according to the first encoding parameter and acquiring the first encoded video data; transmitting the first encoded video data to a user terminal. By determining the first encoding parameter according to the preset threshold values of the video quality evaluation parameters and the video data in the embodiment, QoE (quality of experience) of users is guaranteed. Further, by encoding the video data through the selected first encoding parameter, the first encoded video data are acquired, the amount of the video data is reduced and wireless network congestion caused by a great amount of video data is avoided.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of methods, devices and systems of transfer of data.
Background technology
Video traffic has become the maximum business of internet traffic, and it will be a kind of business form of dominate on the following internet, applications.But, because the data volume that video traffic produces is huge, when it provides abundant information, in the transmission of network, also taken a large amount of network bandwidths, and the limited bandwidth of network, therefore, a large amount of video datas can cause the congested of wireless network.
In the prior art, can consequently reduce its data amount transmitted, reduce the propagation delay time of video data, avoid network congestion through to video data compression, transcoding.
The inventor finds that in realizing process of the present invention there is following defective in prior art:
In the prior art; During to video data compression, transcoding, be to be main purpose with the data amount transmitted that reduces video data, it does not take into full account user's QoE (Quality of Experience; User experience); After video data is by excess compression, transcoding, can makes to have a strong impact on the user, thereby cause user's QoE to can not get guaranteeing the watching of video data.
Summary of the invention
In order to make the user watch that the QoE of video is guaranteed, the embodiment of the invention provides a kind of method of video Data Transmission, and said method comprises:
Obtain video data;
According to preset video quality evaluation parameter threshold value, said video data, confirm first coding parameter;
To said coding video data, obtain first coding video frequency data according to said first coding parameter;
Send said first coding video frequency data to user terminal.
The embodiment of the invention also provides a kind of device of video Data Transmission, and said device comprises:
The first video data acquisition module is used to obtain video data;
The first coding parameter determination module is used for confirming first coding parameter according to preset video quality evaluation parameter threshold value, said video data;
The first coding video frequency data generation module is used for according to said first coding parameter said coding video data is obtained first coding video frequency data;
The first coding video frequency data sending module is used to send said first coding video frequency data to user terminal.
The embodiment of the invention also provides a kind of system of video Data Transmission, and said system comprises video Data Transmission device and terminal:
Said video Data Transmission device; Be used to obtain video data; According to preset video quality evaluation parameter threshold value and said video data, confirm first coding parameter, according to said first coding parameter to said coding video data; Obtain first coding video frequency data, send said first coding video frequency data to said terminal;
Said terminal is used to receive said first coding video frequency data that said video Data Transmission device sends.
The embodiment of the invention is confirmed first coding parameter, thereby has been guaranteed user's QoE through according to preset video quality evaluation parameter threshold value and said video data; Further, to said coding video data, obtain first coding video frequency data, reduced the data volume of video data, avoided because the wireless network that a large amount of video datas causes is congested through first coding parameter selected.
Description of drawings
Fig. 1 is the method flow diagram of the video Data Transmission that provides of the embodiment of the invention 1;
Fig. 2 is the method flow diagram of the video Data Transmission that provides of the embodiment of the invention 2;
Fig. 3 is the method flow diagram of the video Data Transmission that provides of the embodiment of the invention 3;
Fig. 4 is the method flow diagram of the video Data Transmission that provides of the embodiment of the invention 4;
Fig. 5 is the rate adaptation front and back video interception quality comparison diagram that the embodiment of the invention 4 provides;
Fig. 6 is the system gain figure that the embodiment of the invention 4 provides;
Fig. 7 is the apparatus structure sketch map of the video Data Transmission that provides of the embodiment of the invention 5;
Fig. 8 is the apparatus structure sketch map of the video Data Transmission that provides of the embodiment of the invention 6;
Fig. 9 is the video-frequency data transmission system structural representation that the embodiment of the invention 7 provides.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Embodiment 1
As shown in Figure 1, the embodiment of the invention provides a kind of method of video Data Transmission, and said method comprises:
S101: obtain video data;
Optional, said video data can directly get access to; Perhaps the video data behind the coding being decoded obtains, and promptly obtains second coding video frequency data, and said second coding video frequency data is decoded, and obtains this video data.
Wherein, the video data of said second coding video frequency data for original video data being encoded behind the coding that obtains.
S102:, confirm first coding parameter according to preset video quality evaluation parameter threshold value and said video data;
Optional, can be through obtaining interim first coding parameter; To said coding video data, obtain interim reconstructing video data according to said interim first coding parameter; Obtain the video quality evaluation parameter value of said interim reconstructing video data and said video data; Judge that whether said video quality evaluation parameter value is more than or equal to said threshold value; If not; Then be after said interim first coding parameter increases preset increment, to carry out said according to the step of said interim first coding parameter to said coding video data.If, then with said interim first coding parameter as first coding parameter.
Wherein, optional said interim first coding parameter that obtains specifically can comprise: obtain preset interim first coding parameter; Or second coding parameter that obtains said second coding video frequency data is as said interim first coding parameter, the parameter that said second coding parameter adopts when said coding video data being generated said second coding video frequency data.
Preferably, the preset video quality evaluation parameter threshold value in this step can be for a plurality of, and when preset video quality evaluation parameter threshold value when being a plurality of, video quality evaluation parameter threshold value that can be through obtaining said video data is fixed condition really; And according to said definite condition, confirm the video quality evaluation parameter threshold value that satisfies condition, at last with the said video quality evaluation parameter threshold value that satisfies condition as preset video quality evaluation parameter threshold value.
Wherein, the video quality evaluation parameter threshold value of said video data fixed condition really can be for according to the decision of multiple factor, like the total amount of the data of current network condition, video etc.
S103: to said coding video data, obtain first coding video frequency data according to said first coding parameter;
S104: send said first coding video frequency data to user terminal.
Optional, can be through obtaining the Preset Time video data at interval in the said video data; According to preset video quality evaluation parameter threshold value, said Preset Time video data is at interval confirmed first coding parameter.
Because video data is often big optional, therefore can only assess to the video data in a period of time, thereby confirm first coding parameter.This a period of time is assessment duration T1, and T1 can be time of a packet, a frame or a sheet or the like.The purpose that T1 is set is, when assessing at every turn, only need carry out cycle calculations to the data of T1 time, and need not all data of input code flow are carried out cycle calculations, can reduce amount of calculation like this, reduces system complexity.
In addition, can periodically confirm first coding parameter, as this cycle is set is T, T is more than or equal to T1, and T can be time of several packets, several hardwoods etc.; The purpose that T is set is; Every process T time, just once adjudicate again, with the real-time resource utilization and the input video stream of reply variation; Parameters optimization during simultaneously to coding is once upgraded, rather than whole section input video all only adopted fixing parameters optimization.
The embodiment of the invention is confirmed first coding parameter, thereby has been guaranteed user's QoE through according to preset video quality evaluation parameter threshold value and said video data; Further, to said coding video data, obtain first coding video frequency data, reduced the data volume of video data, avoided because the wireless network that a large amount of video datas causes is congested through first coding parameter selected.
Embodiment 2
As shown in Figure 2, the embodiment of the invention provides a kind of method of video Data Transmission, may further comprise the steps:
S201: obtain second coding video frequency data;
Wherein, said second coding video frequency data obtains after for the coding video data that needs are obtained;
S202: said second coding video frequency data is decoded, obtain video data;
S203: obtain interim first coding parameter;
Optional, said first coding parameter can be preset interim first coding parameter; Or second coding parameter through obtaining said second coding video frequency data is as said interim first coding parameter.The parameter that said second coding parameter adopts when said coding video data is generated said second coding video frequency data.
Optional, first coding parameter and second coding parameter are quantization parameter, said interim first coding parameter is interim quantization parameter QP (Quantization Parameter).QP is an important coding parameter, and the QP value is big more, and image is unintelligible more, and encoded video speed is more little, and the bandwidth that takies in the video transmission process is just few more.Optional, the video quality evaluation parameter is PSNR (Peak Signal to Noise Ratio, a Y-PSNR).The relation that existence is successively decreased between the PSNR of video before the QP that is adopted during video coding and coding back reconstructing video and the coding, the QP that is adopted when promptly encoding is big more, and coding back reconstructing video is more little with the PSNR value of the preceding video of coding.QP is as an important coding parameter; Need image sequence collection and the concentrated parameter of argument sequence through video flowing; And the information commuity of data packet head is existing; If promptly seek out the QP of certain section video present frame, need take all factors into consideration the QP information in three in image sequence collection, argument sequence collection and the current data packet header.
Wherein, said Y-PSNR PSNR threshold value can be for defaulting in the Y-PSNR PSNR threshold value in this step executive agent, or the Y-PSNR PSNR threshold value that is got access to from other positions by this step executive agent.
Further optional, said first coding parameter and second coding parameter are the hierarchical coding level, and said interim first coding parameter is interim hierarchical coding level.
S204: to said coding video data, obtain interim reconstructing video data according to said interim first coding parameter;
S205: said interim reconstructing video data and said video data are compared, obtain the first video quality evaluation parameter value;
S206: whether judge said video quality evaluation parameter value more than or equal to said threshold value, if not, then for carrying out S204 behind the preset increment of said interim first coding parameter increase, said preset increment can be positive number or negative; If then carry out S207;
S207: said interim first coding parameter as first coding parameter, to said coding video data, is obtained first coding video frequency data according to this first coding parameter;
S208: send said first coding video frequency data to user terminal.
The embodiment of the invention is confirmed first coding parameter, thereby has been guaranteed user's QoE through according to preset video quality evaluation parameter threshold value and said video data; Further, to said coding video data, obtain first coding video frequency data, reduced the data volume of video data, avoided because the wireless network that a large amount of video datas causes is congested through first coding parameter selected.
Embodiment 3
As shown in Figure 3, the embodiment of the invention provides a kind of method of video Data Transmission, comprises step S301～S306, and wherein, S301～S302 is identical with S201～S202; S305～S306 is identical with S207～S208, and concrete steps repeat no more referring to embodiment 2 here, and different with embodiment 2 is that present embodiment is further comprising the steps of:
S303: the local video quality evaluation parameter threshold value of preserving of inquiry and the corresponding relation of coding parameter, obtain said preset video quality evaluation parameter threshold value corresponding codes parameter;
S304: with said corresponding codes parameter as first coding parameter.
Optional, the corresponding relation of video quality evaluation parameter threshold value and coding parameter can be shown in table one, agrees that video quality evaluation parameter threshold value can corresponding a plurality of coding parameters.
Table one:
Optional, can choose condition and in a plurality of corresponding coding parameters, confirm a coding parameter through coding parameter is set, as be provided with coding parameter choose condition can for, obtain in the said corresponding relation coding parameter near said second coding parameter.Can be through obtaining the coding parameter of second coding parameter described in the said corresponding relation, with said near the coding parameter of said second coding parameter as first coding parameter; Optional, the corresponding relation of said local video quality evaluation parameter threshold value of preserving and coding parameter can be the corresponding relation of the combination corresponding codes parameter value of the video quality evaluation parameter threshold value and second coding parameter; Accordingly, can be through obtaining second coding parameter described in the said corresponding relation and said video quality evaluation parameter threshold value corresponding codes parameter value, with said coding parameter value as first coding parameter.
Further optional, through facts have proved, the coding parameter that adopts during coding has relatively more fixing corresponding relation such as the PSNR between QP and reconstructing video and the source video, and when equaling 40dB such as PSNR, the corresponding QP value during coding is about 25.What therefore, describe in the present embodiment is that a kind of method through static table searching is confirmed coding parameter.
Preferably; The local said PSNR threshold value of preserving and the corresponding relation of coding parameter can be confirmed in the following manner: can be at first through adopting the mode of off-line test; The corresponding relation of QP and PSNR threshold value is made as a form; This charting the QP value of PSNR threshold value and input video when getting various combination, the value of corresponding recodification parameter QP; If there is not the QP that satisfies condition, then the corresponding part of form can be represented with special value, such as 0, at this moment, then can't confirm first coding parameter through S304.
Optional; After the S304, can be specially through carrying out further accurately definite-the first coding parameter of step S203～S206 among the embodiment 2; With first coding parameter of confirming among the S304 as interim first coding parameter among the S203; Order is carried out S203～S206 then, and step repeats no more referring to embodiment 2 here.
The embodiment of the invention is confirmed first coding parameter, thereby has been guaranteed user's QoE through according to preset video quality evaluation parameter threshold value and said video data; Further, to said coding video data, obtain first coding video frequency data, reduced the data volume of video data, avoided because the wireless network that a large amount of video datas causes is congested through first coding parameter selected.Further, present embodiment is confirmed first coding parameter through inquiring about the local threshold value of preserving and the corresponding relation of coding parameter, need not to confirm coding parameter through real-time testing, has saved coding parameter and has fixed time really, has improved code efficiency.
Embodiment 4
As shown in Figure 4, the embodiment of the invention provides a kind of method of video Data Transmission, and said coding video data is generated said second coding video frequency data, the said second volume parameter is second quantization step; And only assess to the video data in a period of time, thereby confirm that first coding parameter is an example, said method comprises:
S401: obtain second coding video frequency data;
S402: said second coding video frequency data is decoded, obtain video data;
Concrete, the video data in said second coding video frequency data that gets access to is decoded, obtain video data.
Optional; Can peel off the video stream data that data packet head is reduced to application layer through second coding video frequency data that will get access to; From the container encloses of video flowing, take out pure stream of video data wherein; And this video flowing decoded, thereby the rear video flow data that obtains decoding obtains this video data.
Wherein, optional, said pure stream of video data can be code stream H.264, or other coded systems code stream, as H.263, MPEG-4 etc., the specific code stream format depends on input.
S403: the quantization step that obtains said second coding video frequency data;
Wherein, the parameter that adopts when said coding video data is generated said second coding video frequency data of quantization step;
Optional; Through decoded video flowing being carried out DPI (Deep Packet Inspection; The depth data bag detects), the image sequence collection and the argument sequence collection of the initial part of decoding rear video are resolved, thereby obtain the quantization step of second coding video frequency data.
S404: obtain Y-PSNR PSNR threshold value;
Wherein, Y-PSNR PSNR threshold value, the threshold value of the quality reduced parameter of the reconstructing video when being meant decoded video and recompile coding, it can pass through channel parameter, resource utilization ratio and user tactics information and confirm.Optional, channel conditions is good more, and resource utilization is more little, and it is big more that the PSNR threshold value also is provided with.
S402, S403, S404 can walk abreast and carry out, and also can serial carry out, and execution sequence can combination in any.
S405: on the basis of the quantization step of said second coding video frequency data, increase preset step size increments, obtain interim quantization step;
S406: to said coding video data, obtain interim reconstructing video data according to said interim quantization step;
S407: whether judge decoded video data is compared among said interim reconstructing video data and the S402 PSNR value more than or equal to said PSNR threshold value, if not, then carry out S408; If then carry out S409;
S408: after the preset step size increments of said interim quantization step increase, carry out S406;
S409: with said interim quantization step as first coding parameter.
S410: to said coding video data, obtain first coding video frequency data according to said first coding parameter;
Concrete, to said coding video data, obtain first coding video frequency data behind the recompile according to said first coding parameter, optional, first coding video frequency data can be code stream H.264.
S411: send said first coding video frequency data to user terminal.
Optional, the H.264 video flowing with after recoding is encapsulated as outputting video streams again.
Wherein, encapsulate again, can also comprise audio stream, caption stream etc. with video flowing after recoding.
Optional; In the present embodiment; What adopt is that said coding video data is generated the parameter that said second coding video frequency data adopts is that quantization step is an example, and when generating parameter that said second coding video frequency data adopts and be the hierarchical coding level, preset accordingly step size increments then is preset hierarchical coding level increment; All the other steps are identical with a present embodiment step, repeat no more here.
Further optional, after the S402, also can comprise step in the present embodiment: obtain the partial video data in the said video data; Accordingly; S405～S409 can be for according to pre-set peak value signal to noise ratio PSNR threshold value; Confirm first coding parameter; Specifically comprise: according to pre-set peak value signal to noise ratio PSNR threshold value, confirm the 3rd coding parameter of said Preset Time video data at interval, with said the 3rd coding parameter as said first coding parameter.
The existing H.264 encoding and decoding simulator JM program of increasing income that adopts is carried out emulation to present embodiment, experimental result such as Fig. 5 and shown in Figure 6; Wherein Fig. 5 is the video interception contrast before and after the rate adaptation; The PSNR threshold value is 40dB, and video QP equals 5 before the left figure rate adaptation, and promptly speed is 1452.7kbps; Video QP after the right figure rate adaptation equals 25, and promptly speed is 319.06kbps.Can find out that the video quality before and after the rate adaptation contrasts, the picture quality difference is also not obvious.
Fig. 6 is the gain diagram of power system capacity, the part that picture in picture goes out corresponding power system capacity figure when regulating among Fig. 5.As can be seen from Figure 6 when the speed of input video itself bigger, QP value than hour, after employing the present invention program carries out rate adaptation; It is apparent in view to gain; When the PSNR threshold value was 40dB, system gain can reach more than 200%, and the meaning of this gain is: if before adopting this programme; System can allow a user to insert; After then adopting this programme, system allows at least 3 users to insert, and the QoE impression with it previous user of these 3 users when watching video watches the not very big decline of QoE impression of video separately.When the speed of input video itself when smaller, system gain is very little, equal 35 like the QP value of input video itself, when the PSNR threshold value was 40dB, system was not gain basically.
Need to prove; Because image sequence collection and argument sequence collection generally are in the first few packet of video flowing, to transmit; Need at first these initial data packets of intercepting in the present embodiment; Can obtaining image sequence collection and the argument sequence collection in the initial package, and be used for confirming that the video data of first coding parameter preferably removes the video data of above-mentioned first few packet, with accuracy, the reasonability of first coding parameter that guarantees to confirm.
Need to prove that this enforcement is increasing progressively the mode of preset step size increments, confirm first coding parameter, optional, can also successively decrease from the desirable maximum of this first coding parameter, thereby confirm first coding parameter.
Need to prove; Be to be that QP is first coding parameter that example is confirmed with the coding parameter in the present embodiment, first coding parameter that also can adopt LPF to come regulations speed to confirm in the present embodiment: at first, the video image of importing is at first carried out dct transform; Low frequency component all concentrates on the upper left corner behind the dct transform; High fdrequency component is distributed in the lower right corner, because low frequency component has comprised the main information of image, and high fdrequency component is just so unimportant by comparison; So can ignore high fdrequency component, thereby reach the purpose of compression.In addition, also can adopt down-sampling downsampling or subsampling in the present embodiment,, reach the purpose that reduces data rate or reduce data volume promptly through reducing signals sampling speed.
Optional; Among above-described all embodiment, confirm first coding parameter, can also trigger the process of confirming first coding parameter through incident except that periodic; Promptly when having new incident to take place in the system; Suddenly increase or reduce like the real-time resource utilization of system, perhaps import the parameter generation saltus step of video itself H.264 etc., then trigger the process of definite first coding parameter described in the above embodiment.In addition, also can combine two kinds of methods of cycle and Event triggered, be the method in cycle under the promptly common state, when incident takes place, directly triggers the change of state, and need not to wait until the arrival in next cycle.
Optional; Among above-described all embodiment; Behind interim first coding parameter of finding out first coincidence gate limit value condition; Do not stop circulation at once, but continue to find out interim first coding parameter of a plurality of coincidence gate limit value conditions, at last a plurality of meet select first coding parameter that conduct is final in the temporary code parameter of threshold condition.
The embodiment of the invention is confirmed first coding parameter, thereby has been guaranteed user's QoE through according to preset video quality evaluation parameter threshold value and said video data; Further, to said coding video data, obtain first coding video frequency data, reduced the data volume of video data, avoided because the wireless network that a large amount of video datas causes is congested through first coding parameter selected.In addition, regulate coding parameter dynamically, improved the accuracy of coding, strengthened to the time wireless channel that becomes adaptability.
Embodiment 5
As shown in Figure 7, the embodiment of the invention provides a kind of device of video Data Transmission, and said device comprises:
The first video data acquisition module 501 is used to obtain video data;
The first coding parameter determination module 502 is used for confirming first coding parameter according to preset video quality evaluation parameter threshold value and said video data;
The first coding video frequency data generation module 503 is used for according to said first coding parameter said coding video data is obtained first coding video frequency data;
The first coding video frequency data sending module 504 is used to send said first coding video frequency data to user terminal.
The embodiment of the invention is confirmed first coding parameter through according to preset video quality evaluation parameter threshold value, said video data; And according to said first coding parameter to said coding video data; Obtain the first encoded video number; Promptly reduced the data volume of video data; Avoided because the wireless network that a large amount of video datas causes is congested,, thereby guaranteed user's QoE simultaneously again through video quality evaluation parameter threshold value is set.
Embodiment 6
As shown in Figure 8; The embodiment of the invention provides a kind of device of video Data Transmission, and said device comprises the first video data acquisition module 501 among the embodiment 5, the first coding parameter determination module 502, the first coding video frequency data generation module 503, the first coding video frequency data sending module 504;
Wherein, the said first video data acquisition module 501 specifically comprises:
The second coding video frequency data acquiring unit 5011 is used to obtain second coding video frequency data, and said second coded data obtains after for the coding video data that needs are obtained;
Video data generation unit 5012 is used for said second coding video frequency data is decoded, and obtains said video data.
The said first coding parameter determination module 502 specifically comprises:
The interim first coding parameter acquiring unit 5021 is used to obtain interim first coding parameter;
Interim reconstructing video data generating unit 5022 is used for according to said interim first coding parameter said coding video data is obtained interim reconstructing video data;
Video quality evaluation parameter value acquiring unit 5023 is used for said interim reconstructing video data and said video data are compared, and obtains the first video quality evaluation parameter value;
Video quality evaluation parameter value judging unit 5024; Be used to judge that whether the said first video quality evaluation parameter value is more than or equal to said threshold value; If not; Then be after said interim first coding parameter increases preset increment, carry out said according to the step of said interim first coding parameter to said coding video data, until the said first video quality evaluation parameter value more than or equal to said threshold value; If, then with said interim first coding parameter as said first coding parameter.
Wherein, the said interim first coding parameter acquiring unit 5021 specifically comprises:
Interim first coding parameter obtains first subelement 50211, is used to obtain preset interim first coding parameter;
Or,
Interim first coding parameter obtains second subelement 50212; Second coding parameter that is used to obtain said second coding video frequency data is as said interim first coding parameter, the parameter that said second coding parameter adopts when said coding video data being generated said second coding video frequency data.
The said first coding parameter determination module 502 specifically also comprises:
Coding parameter is confirmed unit 5025, is used to inquire about the local video quality evaluation parameter threshold value of preserving and the corresponding relation of coding parameter, obtains said preset video quality evaluation parameter threshold value corresponding codes parameter; With said corresponding codes parameter as first coding parameter.
Said device also comprises:
The second video data acquisition module 505 is used for obtaining the Preset Time video data at interval of said video data;
The second coding parameter determination module 506 is used for the threshold value according to video image quality parameter ratio before and after the preset coding, and said Preset Time video data is at interval confirmed first coding parameter.
Need to prove that first coding parameter described in this enforcement and second coding parameter can be quantization parameter, said interim first coding parameter is interim quantization parameter; Or said first coding parameter and second coding parameter are the hierarchical coding level, and said interim first coding parameter is interim hierarchical coding level.
Said device also comprises:
Confirm condition acquisition module 507, the video quality evaluation parameter threshold value that is used to obtain said video data is fixed condition really;
Video quality evaluation parameter threshold value determination module 508; Be used for according to said definite condition; Confirm the video quality evaluation parameter threshold value that satisfies condition, with the said video quality evaluation parameter threshold value that satisfies condition as preset video quality evaluation parameter threshold value.
The embodiment of the invention is confirmed first coding parameter through according to preset video quality evaluation parameter threshold value, said video data; And according to said first coding parameter to said coding video data; Obtain the first encoded video number; Promptly reduced the data volume of video data; Avoided because the wireless network that a large amount of video datas causes is congested,, thereby guaranteed user's QoE simultaneously again through video quality evaluation parameter threshold value is set.
Embodiment 6
As shown in Figure 9, the embodiment of the invention provides a kind of system of video Data Transmission, and said system comprises video Data Transmission device 601 and terminal 602:
Said video Data Transmission device 601; Be used to obtain video data; According to preset video quality evaluation parameter threshold value and said video data, confirm first coding parameter, according to said first coding parameter to said coding video data; Obtain first coding video frequency data, send said first coding video frequency data to said terminal;
Said terminal 602 is used to receive said first coding video frequency data that said video Data Transmission device sends.
Optional, said terminal 602 can be to be used for the video server that video transmission is transmitted, or user user watches the other-end of video.
The embodiment of the invention is confirmed first coding parameter through according to preset video quality evaluation parameter threshold value and said video data; And according to said first coding parameter to said coding video data; Obtain the first encoded video number; Promptly reduced the data volume of video data; Avoided because the wireless network that a large amount of video datas causes is congested,, thereby guaranteed user's QoE simultaneously again through video quality evaluation parameter threshold value is set.
All or part of content in the technical scheme that above embodiment provides can realize that through software programming its software program is stored in the storage medium that can read, storage medium for example: the hard disk in the computer, CD or floppy disk.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. the method for a video Data Transmission is characterized in that, said method comprises:
Obtain video data;
According to preset video quality evaluation parameter threshold value and said video data, confirm first coding parameter;
To said coding video data, obtain first coding video frequency data according to said first coding parameter;
Send said first coding video frequency data to user terminal.
2. method according to claim 1 is characterized in that, said obtaining after the video data, and said method also comprises;
The video quality evaluation parameter threshold value of obtaining said video data is fixed condition really;
According to said definite condition, confirm the video quality evaluation parameter threshold value that satisfies condition;
With the said video quality evaluation parameter threshold value that satisfies condition as preset video quality evaluation parameter threshold value.
3. method according to claim 1 is characterized in that, the said video data that obtains specifically comprises:
Obtain second coding video frequency data, said second coding video frequency data obtains after for the coding video data that needs are obtained;
Said second coding video frequency data is decoded, obtain said video data.
4. method according to claim 3 is characterized in that, video quality evaluation parameter threshold value and said video data that said basis is preset are confirmed first coding parameter, specifically comprise:
Obtain interim first coding parameter;
To said coding video data, obtain interim reconstructing video data according to said interim first coding parameter;
Said interim reconstructing video data and said video data are compared, obtain the first video quality evaluation parameter value;
Whether judge the said first video quality evaluation parameter value more than or equal to said threshold value, if not,
Then be that said interim first coding parameter increases preset increment, carry out said according to the step of said interim first coding parameter to said coding video data, until the said first video quality evaluation parameter value more than or equal to said threshold value;
If, then with said interim first coding parameter as said first coding parameter.
5. method according to claim 4 is characterized in that:
Saidly obtain interim first coding parameter, specifically comprise:
Obtain preset interim first coding parameter;
Or,
Second coding parameter that obtains said second coding video frequency data is as said interim first coding parameter, the parameter that said second coding parameter adopts during said second coding video frequency data for the coding video data that needs are obtained generates.
6. method according to claim 2 is characterized in that, video quality evaluation parameter threshold value and said video data that said basis is preset confirm that first coding parameter specifically comprises:
The local video quality evaluation parameter threshold value of preserving of inquiry and the corresponding relation of coding parameter obtain said preset video quality evaluation parameter threshold value corresponding codes parameter;
With said corresponding codes parameter as first coding parameter.
7. according to the described method of each claim of 3-6, it is characterized in that:
Said first coding parameter and second coding parameter are quantization parameter, and said interim first coding parameter is interim quantization parameter;
Or said first coding parameter and second coding parameter are the hierarchical coding level, and said interim first coding parameter is interim hierarchical coding level.
8. method according to claim 1 is characterized in that, said obtaining after the video data, and said method also comprises:
Obtain the Preset Time video data at interval in the said video data;
Accordingly, according to preset video quality evaluation parameter threshold value and said video data, confirm that first coding parameter specifically comprises:
Threshold value and said Preset Time video data at interval according to video image quality parameter ratio before and after the preset coding are confirmed first coding parameter.
9. the device of a video Data Transmission is characterized in that, said device comprises:
The first video data acquisition module is used to obtain video data;
The first coding parameter determination module is used for confirming first coding parameter according to preset video quality evaluation parameter threshold value and said video data;
The first coding video frequency data generation module is used for according to said first coding parameter said coding video data is obtained first coding video frequency data;
The first coding video frequency data sending module is used to send said first coding video frequency data to user terminal.
10. device according to claim 9 is characterized in that said device also comprises;
Confirm the condition acquisition module, the video quality evaluation parameter threshold value that is used to obtain said video data is fixed condition really;
Video quality evaluation parameter threshold value determination module; Be used for according to said definite condition; Confirm the video quality evaluation parameter threshold value that satisfies condition, with the said video quality evaluation parameter threshold value that satisfies condition as preset video quality evaluation parameter threshold value.
11. device according to claim 9 is characterized in that, the said first video data acquisition module specifically comprises:
The second coding video frequency data acquiring unit is used to obtain second coding video frequency data, and said second coding video frequency data obtains after for the coding video data that needs are obtained;
The video data generation unit is used for said second coding video frequency data is decoded, and obtains said video data.
12. device according to claim 11 is characterized in that, the said first coding parameter determination module specifically comprises:
The interim first coding parameter acquiring unit is used to obtain interim first coding parameter;
Interim reconstructing video data generating unit is used for according to said interim first coding parameter said coding video data is obtained interim reconstructing video data;
Video quality evaluation parameter value acquiring unit is used for said interim reconstructing video data and said video data are compared, and obtains the first video quality evaluation parameter value;
Video quality evaluation parameter value judging unit; Be used to judge that whether the said first video quality evaluation parameter value is more than or equal to said threshold value; If not; Then be after said interim first coding parameter increases preset increment, carry out said according to the step of said interim first coding parameter to said coding video data, until the said first video quality evaluation parameter value more than or equal to said threshold value; If, then with said interim first coding parameter as said first coding parameter.
13. device according to claim 12 is characterized in that, the said interim first coding parameter acquiring unit specifically comprises:
Interim first coding parameter obtains first subelement, is used to obtain preset interim first coding parameter;
Or,
Interim first coding parameter obtains second subelement; Second coding parameter that is used to obtain said second coding video frequency data is as said interim first coding parameter, the parameter that said second coding parameter adopts during said second coding video frequency data for the coding video data that needs are obtained generates.
14. device according to claim 9 is characterized in that, the said first coding parameter determination module specifically also comprises:
Coding parameter is confirmed the unit, is used to inquire about the local video quality evaluation parameter threshold value of preserving and the corresponding relation of coding parameter, obtains said preset video quality evaluation parameter threshold value corresponding codes parameter; With said corresponding codes parameter as first coding parameter.
15., it is characterized in that according to the described device of each claim of 12-14:
Said first coding parameter and second coding parameter are quantization parameter, and said interim first coding parameter is interim quantization parameter;
Or said first coding parameter and second coding parameter are the hierarchical coding level, and said interim first coding parameter is interim hierarchical coding level.
16. device according to claim 9 is characterized in that, said device also comprises:
The second video data acquisition module is used for obtaining the Preset Time video data at interval of said video data;
The second coding parameter determination module is used for confirming first coding parameter according to the threshold value and the said Preset Time video data at interval of video image quality parameter ratio before and after the preset coding.
17. the system of a video Data Transmission is characterized in that, said system comprises video Data Transmission device and terminal:
Said video Data Transmission device; Be used to obtain video data; According to preset video quality evaluation parameter threshold value and said video data, confirm first coding parameter, according to said first coding parameter to said coding video data; Obtain first coding video frequency data, send said first coding video frequency data to said terminal;
Said terminal is used to receive said first coding video frequency data that said video Data Transmission device sends.
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| PCT/CN2011/081912 WO2012119459A1 (en) | 2011-03-08 | 2011-11-08 | Data transmission method, apparatus and system |
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| WO2012119459A1 (en) | 2012-09-13 |
| CN102685472B (en) | 2014-11-05 |
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