CN1226851C - Method for self-adaption adjusting network video frequency quality - Google Patents
Method for self-adaption adjusting network video frequency quality Download PDFInfo
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Abstract
The present invention provides a method for adjusting network video quality by self-adaption. Sending velocities of multimedia streams can be regulated in real time by combining available bandwidth verification and the measurement of parameters of throughput, etc. so as to ensure the optimal video quality. The present invention has comprises the following specific procedures: a first procedure, starting up a passive measurement module; a second procedure, judging a current network state by a receiving terminal; a third procedure, starting up an active measurement module; a fourth procedure, verifying available bandwidth; a fifth procedure, finishing the active measurement module. The present invention is independent of specific codes and decoding, and has the advantages of easy transportation stable quality of video streams and small QoS dithering; the measurement method of the available bandwidth can be used for real-time application without generating adverse effects on a network.
Description
Technical field
The present invention relates to a kind of method of regulating networks video quality, particularly a kind of method of the video quality of regulating networks adaptively, this method are adjusted the transmission rate of media stream by the real-time verification network availability bandwidth, guarantee best video quality.
Background technology
Along with the fast development of internet, digital interactive television, video request program, video conference, remote teaching, tele-medicine or the like have all progressively entered into people's life.The research video becomes current heat subject in the effective transmission on the internet.Real-time video transmission has the requirement of bandwidth, time delay and data loss rate aspect usually, but the internet of doing one's best does not at present provide necessary service quality regulation mechanism for this reason.At present the service quality control method to live video stream can be divided into 3 big classes: rate adaptive video coding, rate-shaping and based on the rate controlled of detection.Rate adaptive video coding makes that the packed data stream behind the coding meets certain bandwidth requirement, for example the product SMART of Microsoft by changing coded system.Its shortcoming is not have versatility, need do different expansions at concrete encoding and decoding.Rate-shaping is to abandon some frames selectively so that the output speed of video flowing and available bandwidth adapt by increase a rate shaper between video encoder and network.Rate-shaping does not have versatility equally, need be at the control strategy on the different network of concrete encoding and decoding formulation.In addition, because rate-shaping finished by the third party who is independent of video application usually, so adjustable range is limited, and video server itself still can keep original transmission rate, in fact caused the waste of disposal ability.Judge that by increasing transmission rate or receiving velocity whether network state is stable, if stable, further advances the speed based on the rate controlled of surveying; Otherwise, reduce transmission rate or receiving velocity.Based on the rate controlled of surveying, measurement itself is to finish by the transmission rate of regulating useful data, might cause losing of useful data, and image quality descends, even if under the situation of packet loss not, the shake of service quality also can be bigger.
In addition, also the someone proposes with the foundation of available bandwidth as service quality adjusting in real time, but available bandwidth itself alters a great deal in time, is very difficult to measure.Though have certain methods to measure available bandwidth substantially at present, Measuring Time is long, real-time is poor.And need to send a large amount of probe messages, network is made a big impact, in wireless network even may cause network congestion, cost performance is low.So the measurement of available bandwidth still rests on theoretical research stage at present, also really be not used in the middle of the actual real-time application.
Summary of the invention
An object of the present invention is to provide a kind of universal method of the video quality of regulating networks adaptively, it is independent of concrete encoding and decoding, is easy to transplant.
Another object of the present invention provides a kind of method of real-time regulating networks video quality, makes video flow quality stable, and the service quality shake is little.
Another object of the present invention provides a kind of bandwidth verification of utilizing and comes the method for regulating networks video quality adaptively, makes some method of measurement of available bandwidth can be used for real-time application, and can not have a negative impact to network itself.
The present invention proposes a kind of method of the video quality of regulating networks adaptively, by bandwidth verification and the isoparametric measurement of throughput being combined the transmission rate of real-time regulated media stream, to guarantee best video quality, it is characterized in that concrete steps are as follows:
Step 1: start the passive measurement module;
Step 2: receiving terminal is judged present network condition, if network condition worsens, the notice transmitting terminal reduces service quality; If initiatively measurement module starts, end initiatively measurement module; Change step 2; If network condition is stable, and initiatively measurement module does not start, and then sets up another thread or process transfer active measurement module to step 3, current thread or process circulation execution in step 2;
Step 3: start initiatively measurement module;
Step 4: the checking available bandwidth, the available bandwidth of current network can be supported higher leveled service quality, then notifies transmitting terminal, adopts higher leveled service quality; Otherwise, keep former service quality;
Step 5: finish initiatively measurement module.
Wherein can the available bandwidth of step 4 checking current network satisfy higher leveled service quality, rather than measure the real available bandwidth size of current time.
Wherein the passive measurement module described in the step 2 is judged the deterioration of network by the combination of measuring throughput, delay, packet loss or these several persons, thereby reduces service quality rating when being necessary.
Wherein the passive measurement module described in the step 2 is called initiatively measurement module in the suitable moment, and can in time end initiatively measurement module under the situation that worsening appears in network.
Description of drawings
For further specifying content of the present invention, below in conjunction with drawings and Examples the present invention is done a detailed description, wherein:
Fig. 1 is the flow chart of described self-adaptive service quality regulating system.
Embodiment
See also Fig. 1,, propose a kind of method of the video quality of regulating networks adaptively, by bandwidth verification and the isoparametric measurement of throughput being combined the service quality rating of real-time regulated video flowing at this.Specifically be divided into two modules: passive measurement module and active measurement module.The passive measurement module reduces service quality rating when being necessary by parameters such as measurement throughputs; Initiatively measurement module is by checking available bandwidth, the grade of improving service quality under possible situation.
When service quality rating was constant, the throughput that client measures should keep a metastable value.If observe the throughput of client this moment suddenly violent decline is arranged, present network congestion then is described.In this case, client can reduce the variation that service quality rating adapts to network by the announcement server end.Yet, can not embody the improvement of network condition to the detection of throughput, so if only regulate service quality according to change in throughput, we can't determine that heightening levels of quality of service when obtains the better pictures quality.This problem can solve at the active measurement module.Certainly, we also can measure delay in the passive measurement module, and the deterioration of network is judged in packet loss or these several persons' combination.Its basic principle is identical with the measurement throughput.
Initiatively measurement module is used to solve the problem of when improving service quality.In ideal conditions, if we know definite network availability bandwidth at present, we just can regulate service quality well.In this case, we even do not need the passive measurement module can finish whole service quality adjustment process.But fact of case is that available bandwidth is very difficult to be surveyed.In in the past 15 years, global scientist is devoted to the measurement of available bandwidth always.Though existing certain methods can estimate available bandwidth size relatively accurately, they often need long time just can draw measurement result.What in fact they were tried to achieve is the mean value of an available bandwidth in the long duration, and this mean value is not owing to reflecting current network condition, so be difficult to the foundation as real-time regulated service quality.In addition, these methods all need to send a large amount of probe messages, and these survey flow can produce very big influence to existing application on the network.Especially in the very limited network environment of wireless equiband, these are surveyed flows even can cause network paralysis.So it is very unpractical directly regulating service quality by the measurement available bandwidth.
Consider under the actual conditions that the user prefers stable picture quality, even this service quality is not the highest at present.And dislike the picture quality of acute variation, even each moment service quality all be the peak that can reach.Therefore, our self-adaptive service quality regulating system has the characteristics of linear rising index decreased (AIMD).That is to say, take a turn for the better that occurred more available bandwidth in other words, we just improve a grade to service quality if find network condition.After the each successful active probe, we only improve a rank to service quality, even present available bandwidth can be supported higher levels of quality of service.In our self-adaptive service quality regulating system, the rising of picture quality is exactly a level and smooth and stable process like this, has avoided shake and to the harmful effect of network.The another one benefit of this way is that can the target of our active measurement module is reduced to the current network of checking satisfy higher leveled service quality, rather than measures the real network availability bandwidth of current time.This is for being avoided unnecessary detection flow, and some thoughts of available bandwidth measurement are used for that real-time service quality regulates is very important.
For example, a kind of method of measurement of available bandwidth is arranged, its central idea is that the One Way Delay of probe messages can be the trend of rising when the transmission rate of probe messages stream is higher than available bandwidth.Come probe for available bandwidth in this way, we at first should be with certain speed o
MinSend one group of message.Subsequently transmission rate is improved Δ o, send one group of message again.Improve constantly transmission rate, up to working as us with o
MaxSpeed when sending message, the trend that rises has appearred in the One Way Delay of observing probe messages.O so
MaxThe available bandwidth that records exactly.But in our active measurement module, can we only need the current network of checking satisfy higher leveled service quality, rather than measure the real available bandwidth of current time.If so current service quality is improved the bandwidth that one-level needs to take 100kb more, we only need send one group of test packet with the speed of 100kb.If the One Way Delay of not observing probe messages has the trend of rising, we just can think that the available bandwidth of current network greater than 100kb, can support higher leveled service quality.Even the available bandwidth of current reality has 100M, we also need not to send the concrete size that a large amount of probe messages is measured available bandwidth for a long time, because each only with rank of service quality raising in our system.Can network support higher levels of quality of service, and we will verify after a period of time at system stability again.
When the passive measurement module of system detects the deterioration of network condition, its can announcement server end reduces service quality rating adapt to this variation.Simultaneously, system will start the timer of an active probe.If during this period, the passive measurement module has detected the deterioration of network again, and it can continue requirement and reduce levels of quality of service, simultaneously with the timer zero clearing of active probe.If timer expired illustrates that network is stable, can satisfy current levels of quality of service, can system will call initiatively measurement module and check and obtain higher service quality.In the process of active measurement module work,, will end the initiatively operation of measurement module if the passive measurement module detects the deterioration of network.That is to say that the passive measurement module is all the time in operation, and initiatively measurement module has only in due course and just can be called.Therefore, we just can not send test packet under the situation of network congestion, so our self-adaptive service quality regulating system is friendly to network.
The method of the video quality of regulating networks adaptively that we propose can directly apply to the adjustable media stream of all video qualities, for it provides real-time detection, controlling mechanism, makes it possess the feature of regulating service quality adaptively.Because be independent of concrete encoding and decoding,, need not different expansions is done in concrete encoding and decoding so have versatility.Owing to have the characteristic of AIMD, so stable image quality, the service quality shake is little, and little to web influence.In addition, this characteristic has been simplified initiatively measurement module, makes some thoughts of available bandwidth measurement overcome poor, big to the web influence shortcoming of intrinsic real-time, in the middle of can being used to use in real time.
Claims (4)
1. method of regulating networks video quality adaptively by bandwidth verification and the isoparametric measurement of throughput being combined the transmission rate of real-time regulated media stream, to guarantee best video quality, is characterized in that concrete steps are as follows:
Step 1: start the passive measurement module;
Step 2: receiving terminal is judged present network condition, if network condition worsens, the notice transmitting terminal reduces service quality; If initiatively measurement module starts, end initiatively measurement module; Change step 2; If network condition is stable, and initiatively measurement module does not start, and then sets up another thread or process transfer active measurement module to step 3, current thread or process circulation execution in step 2;
Step 3: start initiatively measurement module;
Step 4: the checking available bandwidth, the available bandwidth of current network can be supported higher leveled service quality, then notifies transmitting terminal, adopts higher leveled service quality; Otherwise, keep former service quality;
Step 5: finish initiatively measurement module.
2. the method for the video quality of regulating networks adaptively according to claim 1 is characterized in that, wherein can the available bandwidth of step 4 checking current network satisfy higher leveled service quality, rather than measures the real available bandwidth size of current time.
3. the method for the video quality of regulating networks adaptively according to claim 1, it is characterized in that, wherein the passive measurement module described in the step 2 is judged the deterioration of network by the combination of measuring throughput, delay, packet loss or these several persons, thereby reduces service quality rating when being necessary.
4. the method for the video quality of regulating networks adaptively according to claim 1, it is characterized in that, wherein the passive measurement module described in the step 2 is called initiatively measurement module in the suitable moment, and can in time end initiatively measurement module under the situation that worsening appears in network.
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| CNB02159354XA CN1226851C (en) | 2002-12-26 | 2002-12-26 | Method for self-adaption adjusting network video frequency quality |
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| CNB02159354XA CN1226851C (en) | 2002-12-26 | 2002-12-26 | Method for self-adaption adjusting network video frequency quality |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100425078C (en) * | 2005-11-08 | 2008-10-08 | 上海广电（集团）有限公司中央研究院 | Self-adaptive associated controlling method for coding speed and video quality in bit rate switchover |
| CN100448205C (en) * | 2006-05-15 | 2008-12-31 | 西安西电捷通无线网络通信有限公司 | Method for co-collecting IP network performance by active type measure and passive type measure |
| CN101026437B (en) * | 2007-02-07 | 2012-03-28 | 建汉科技股份有限公司 | Dynamic band width measuring device and method |
| CN101621681B (en) * | 2009-07-30 | 2012-08-29 | 腾讯科技（深圳）有限公司 | Method and equipment for adjusting video communication quality |
| HUE043713T2 (en) * | 2013-03-29 | 2019-09-30 | Intel Ip Corp | Quality-aware rate adaptation techniques for dash streaming |
| CN104135444A (en) * | 2013-05-02 | 2014-11-05 | 腾讯科技（深圳）有限公司 | A method and a device for controlling multimedia data transmission flow |
| CN104219479B (en) * | 2013-05-30 | 2017-11-03 | 中国电信股份有限公司 | Video communication service processing method and system |
| CN104486163B (en) * | 2014-12-25 | 2018-11-06 | 中国科学院声学研究所 | A kind of single-end available bandwidth measuring and the terminal using this method |
| CN108011771A (en) * | 2016-11-01 | 2018-05-08 | 阿里巴巴集团控股有限公司 | Detection method, device and the equipment of network link available bandwidth |
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