CN107071399A - The method for evaluating quality and device of a kind of encrypted video stream - Google Patents
The method for evaluating quality and device of a kind of encrypted video stream Download PDFInfo
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- CN107071399A CN107071399A CN201710281972.6A CN201710281972A CN107071399A CN 107071399 A CN107071399 A CN 107071399A CN 201710281972 A CN201710281972 A CN 201710281972A CN 107071399 A CN107071399 A CN 107071399A
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- video slicing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The embodiment of the present application discloses the method for evaluating quality and device of a kind of encrypted video stream, is related to the communications field, solves the problem of how network side is estimated to the quality of encrypted video stream.Concrete scheme is：Obtain at least one video slicing, obtain the fluency affecting parameters and definition affecting parameters of each video slicing, according to fluency affecting parameters and fluency model, obtain the fluency assessed value of each video slicing, according to definition affecting parameters and definition model, obtain the intelligibility evaluation value of each video slicing, the fluency assessed value for being worth to encrypted video stream is assessed according to the fluency of each video slicing, the intelligibility evaluation value of encrypted video stream is worth to according to the intelligibility evaluation of each video slicing, comprehensive assessment is carried out according to the fluency assessed value of encrypted video stream and the intelligibility evaluation value of encrypted video stream, obtain the comprehensive assessment value of encrypted video stream.The embodiment of the present application is used for the process being estimated to the quality of encrypted video stream.
Description
Technical field
The invention relates to the method for evaluating quality and device of the communications field, more particularly to a kind of encrypted video stream.
Background technology
Streaming Media is also known as streaming video, is the media broadcast when passing, is broadcast when passing and refer to Media Provider on network
While transmission media, the user of client can constantly receive and watch or listen to the media being transmitted.Streaming Media can be with
Including video flowing and audio stream.In overseas, the flow of video flowing progressively occupies leading position in network total flow, and quick
Increase, moreover, the flow of encrypted video stream has exceeded the flow of non-encrypted video flowing.
At present, the experience feature modeling of video flowing can improve the quality of video flowing with experience abnormality detection and improve user
Experience.The experience evaluation method of video flowing be based primarily upon in plain text obtain video flowing relevant information, such as flow, business, code check,
Pause, just delay etc., and these information can not be obtained directly after video flowing encrypted transmission, it is impossible to assess encrypted video stream.
In the prior art, the form of active probe is relied primarily on to the experience evaluation method of encrypted video stream, that is, utilized
Acquisition for mobile terminal experiences index.And for being estimated in network side to the quality of encrypted video stream, industry there is no solution at present
Certainly scheme.Therefore, the quality for how assessing encrypted video stream in network side is a urgent problem to be solved.
The content of the invention
The embodiment of the present application provides a kind of method for evaluating quality and device of encrypted video stream, solve network side how
The problem of being estimated to the quality of encrypted video stream.
To reach above-mentioned purpose, the embodiment of the present application is adopted the following technical scheme that：
The first aspect of the embodiment of the present application there is provided a kind of method for evaluating quality of encrypted video stream, including：
First, at least one video slicing is obtained, then at least one video slicing composition encrypted video stream, obtains every
The fluency affecting parameters of individual video slicing and the definition affecting parameters of each video slicing, according to the stream of each video slicing
Smooth degree affecting parameters and fluency model, are estimated to the fluency of each video slicing, to obtain each video slicing
Fluency assessed value, and according to the definition affecting parameters and definition model of each video slicing, to each video slicing
Definition be estimated, to obtain the intelligibility evaluation value of each video slicing, finally, according to the smoothness of each video slicing
Degree, which is assessed, is worth to the fluency assessed value of encrypted video stream, and be worth to according to the intelligibility evaluation of each video slicing plus
The intelligibility evaluation value of close video flowing, further according to the fluency assessed value and the intelligibility evaluation of encrypted video stream of encrypted video stream
Value carries out comprehensive assessment, to obtain the comprehensive assessment value of encrypted video stream.Wherein, video slicing is in the first period server
The data sent to client are held, the first period was that client is arrived in the n-th video slicing request that client is sent
The period of the (n+1)th video slicing request sent to server end is held, n is the integer more than or equal to 1；Fluency affecting parameters
Including traffic performance and the first pipe characteristic, definition affecting parameters include traffic performance and second pipe characteristic, traffic performance,
For characterizing the feature of video slicing in itself, the first pipe characteristic, the feature for characterizing transmission video slicing, second pipe is special
Property, the feature for characterizing transmission video slicing.
The method for evaluating quality for the encrypted video stream that the embodiment of the present application is provided, is encrypted using fluency model by constituting
The fluency affecting parameters of each video slicing of video flowing, are estimated to the fluency of each video slicing, obtain each
The fluency assessed value of video slicing, and using definition model by constitute encrypted video stream each video slicing it is clear
Clear degree affecting parameters, the definition to each video slicing is estimated, and obtains the intelligibility evaluation value of each video slicing,
The fluency assessed value for being worth to encrypted video stream is assessed according to the fluency of each video slicing, and according to each video point
The intelligibility evaluation of piece is worth to the intelligibility evaluation value of encrypted video stream, according to the fluency assessed value of encrypted video stream and plus
The intelligibility evaluation value of close video flowing carries out comprehensive assessment, to obtain the comprehensive assessment value of encrypted video stream, so as to add to composition
Each video slicing of close video flowing is estimated, and to obtain the assessed value of each video slicing, then passes through each video slicing
Assessment be worth to the comprehensive assessment value of encrypted video stream, how efficiently solve in network side to the quality of encrypted video stream
The problem of being estimated.
With reference in a first aspect, in a kind of possible implementation, after at least one video slicing is obtained, method is also
Including：
Obtain the playable duration of each video slicing；Obtain the data volume of each video slicing；Obtain each video point
The code check of piece, the code check of video slicing is the playable duration of data volume/video slicing of video slicing.So that in order to count
Calculate traffic performance, the first pipe characteristic and the second pipe characteristic of video slicing.
With reference to above-mentioned possible implementation, in alternatively possible implementation, obtain each video slicing can
Playing duration includes：
When audio burst and video slicing individual transmission, the playable duration of audio burst and audio burst is obtained,
The playable duration of video slicing is estimated according to the playable duration of audio burst, audio burst and video slicing are corresponded；
When audio burst and video slicing are transmitted together, be defined as to the playable duration of video slicing the first period.So as to basis
Different scenes more accurately obtains the playable duration of video slicing.
With reference to above-mentioned possible implementation, in alternatively possible implementation, traffic performance includes：Video slicing
Downloading duration feature, is the preset value of the downloading duration of downloading duration/video slicing of video slicing, during the download of video slicing
The video point of server end transmission is received at the time of a length of client sends video slicing request to client
At the time of piece；Video slicing downloads interval feature, is that interval/video between video slicing can play duration, when video can play
The summation of the playable duration of a length of each video slicing；Audio frequency and video fragment request success rate feature, is audio frequency and video fragment request
Success number/audio frequency and video request number；Video slicing code check feature, is the video slicing of code check/the i-th -1 of the i-th video slicing
Code check, i is the number of the video slicing less than or equal to encrypted video stream；Player satisfaction feature, is downloading data amount/broadcast
Put required data volume.It is specific to download interval feature, audio frequency and video burst by video slicing downloading duration feature, video slicing and ask
Power features, video slicing code check feature and the player satisfaction feature of hoping for success obtain the fluency assessed value of video slicing and clear
Clear degree assessed value.
With reference to above-mentioned possible implementation, in alternatively possible implementation, the first pipe characteristic includes：Come and go
Time delay RTT, packet loss, up-downgoing speed ratio, maximum downstream rate, average downstream rate, average packet transmission rate and RST fields
Distribution；Second pipe characteristic includes：Round-trip delay RTT, packet loss, up-downgoing speed ratio, maximum downstream rate, averagely descend scanning frequency
Rate and average inter-packet gap, average inter-packet gap, for the bag transmission total bag number of total time-consuming/transmission.First pipe characteristic and second pipe are special
Property can be obtained according to prior art, will not be repeated here.By features above obtain video slicing fluency assessed value and
Intelligibility evaluation value.
With reference to first aspect and above-mentioned possible implementation, in alternatively possible implementation, regarded according to each
The fluency of frequency division piece assesses the fluency assessed value for being worth to encrypted video stream, and according to the definition of each video slicing
The intelligibility evaluation value that assessment is worth to encrypted video stream includes：
The fluency assessed value of each video slicing is iterated using the first formula, to obtain the stream of encrypted video stream
Smooth to spend assessed value, the first formula is：F (i)=ω * F (i-1)+(1- ω) * Fi, wherein, F (i) is the fluency of encrypted video stream
Assessed value, F (i-1) is the fluency assessed value of the i-th -1 video slicing, FiFor the fluency assessed value of the i-th video slicing, ω is
Weight, ω is more than 0 and is less than 1；The intelligibility evaluation value of each video slicing is iterated using the second formula, to be encrypted
The intelligibility evaluation value of video flowing, the second formula is：C (i)=σ * C (i-1)+(1- σ) * Ci, C (i) is the clear of encrypted video stream
Clear degree assessed value, C (i-1) is the intelligibility evaluation value of the i-th -1 video slicing, wherein, CiDefinition for the i-th video slicing is commented
Valuation, σ is weight, and σ is more than 0 and is less than 1.
With reference to first aspect and above-mentioned possible implementation, in alternatively possible implementation, regarded according to encryption
The fluency assessed value of frequency stream and the intelligibility evaluation value of encrypted video stream carry out comprehensive assessment, to obtain the comprehensive of encrypted video stream
Closing assessed value includes：
Entered according to the intelligibility evaluation value of the fluency assessed value of encrypted video stream and encrypted video stream using the 3rd formula
Row comprehensive assessment, to obtain the comprehensive assessment value of encrypted video stream, the 3rd formula is：S=f [F, C]=α * f+ (1- α) * C, its
In, S is the comprehensive assessment value of encrypted video stream, and F is the fluency assessed value of encrypted video stream, and C is clear for encrypted video stream
Assessed value is spent, α is weight, and α is more than 0.5 and is less than 1.
The second aspect of the embodiment of the present application there is provided a kind of quality assessment device of encrypted video stream, including：
Acquiring unit, for obtaining at least one video slicing, video slicing is to visitor at the first period server end
The data that family end is sent, the first period is that the n-th video slicing request that client is sent arrives client to clothes
The period for (n+1)th video slicing request that business device end is sent, n is the integer more than or equal to 1, at least one video slicing composition
Encrypted video stream；Acquiring unit, be additionally operable to obtain each video slicing fluency affecting parameters and each video slicing it is clear
Clear degree affecting parameters, fluency affecting parameters include traffic performance and the first pipe characteristic, and definition affecting parameters include business
Characteristic and second pipe characteristic, traffic performance, for characterizing the feature of video slicing in itself, the first pipe characteristic, for characterizing
Transmit the feature of video slicing, second pipe characteristic, the feature for characterizing transmission video slicing；Processing unit, for basis
The fluency affecting parameters and fluency model of each video slicing, are estimated to the fluency of each video slicing, with
To the fluency assessed value of each video slicing, and according to the definition affecting parameters and definition mould of each video slicing
Type, the definition to each video slicing is estimated, to obtain the intelligibility evaluation value of each video slicing；Processing unit,
It is additionally operable to assess the fluency assessed value for being worth to encrypted video stream according to the fluency of each video slicing, and according to each
The intelligibility evaluation of video slicing is worth to the intelligibility evaluation value of encrypted video stream；
Processing unit, is additionally operable to the fluency assessed value according to encrypted video stream and the intelligibility evaluation value of encrypted video stream
Comprehensive assessment is carried out, to obtain the comprehensive assessment value of encrypted video stream.
The third aspect of the embodiment of the present application can include there is provided a kind of server, the server：At least one processing
Device, memory, communication interface, communication bus；
At least one processor is connected with memory, communication interface by communication bus, and memory is used to store computer
Execute instruction, when server is run, the computer executed instructions of computing device memory storage, so that server performs the
The method for evaluating quality of any described encrypted video stream in the possible implementation of one side or first aspect.
The fourth aspect of the embodiment of the present application is there is provided a kind of computer-readable storage medium, for storing used in above-mentioned server
Computer software instructions, the computer software instructions include be used for perform set by the method for evaluating quality of above-mentioned encrypted video stream
The program of meter.
5th aspect, the embodiment of the present application provides a kind of computer program product for including instruction, when it is in computer
During upper operation so that computer can perform the method for above-mentioned any aspect.
In addition, the second aspect technique effect that any design method is brought into the 5th aspect is reference can be made to first aspect
The technique effect that middle different designs mode is brought, here is omitted.
In the embodiment of the present application, the name of the quality assessment device of encrypted video stream does not constitute restriction in itself to equipment,
In actual realization, these equipment can occur with other titles.As long as the function of each equipment is similar with the embodiment of the present application, category
Within the scope of the application claim and its equivalent technologies.
These aspects or other aspects of the embodiment of the present application can more straightforwards in the following description.
Brief description of the drawings
A kind of system architecture schematic diagram that Fig. 1 provides for the embodiment of the present application；
A kind of computer equipment structural representation that Fig. 2 provides for the embodiment of the present application；
A kind of flow chart of the method for evaluating quality for encrypted video stream that Fig. 3 provides for the embodiment of the present application；
A kind of schematic diagram for video slicing that Fig. 4 provides for the embodiment of the present application；
A kind of video player satisfaction schematic diagram that Fig. 5 provides for the embodiment of the present application；
The flow chart of the method for evaluating quality for another encrypted video stream that Fig. 6 provides for the embodiment of the present application；
A kind of quality assessment device structural representation for encrypted video stream that Fig. 7 provides for the embodiment of the present application；
The quality assessment device structural representation for another encrypted video stream that Fig. 8 provides for the embodiment of the present application.
Embodiment
The embodiment of the present application provides a kind of method for evaluating quality of encrypted video stream, and its general principle is：Utilize fluency
Model is entered by constituting the fluency affecting parameters of each video slicing of encrypted video stream to the fluency of each video slicing
Row is assessed, and obtains the fluency assessed value of each video slicing, and using definition model by constituting encrypted video stream
The definition affecting parameters of each video slicing, the definition to each video slicing is estimated, and obtains each video slicing
Intelligibility evaluation value, be worth to the fluency assessed value of encrypted video stream being assessed according to the fluency of each video slicing,
And the intelligibility evaluation value of encrypted video stream is worth to according to the intelligibility evaluation of each video slicing, according to encrypted video stream
Fluency assessed value and encrypted video stream intelligibility evaluation value carry out comprehensive assessment, commented with the synthesis for obtaining encrypted video stream
Valuation, so that each video slicing for constituting encrypted video stream is estimated, to obtain the assessed value of each video slicing, then
The comprehensive assessment value of encrypted video stream is worth to by the assessment of each video slicing, efficiently solved how right network side is
The problem of quality of encrypted video stream is estimated.
The embodiment of the embodiment of the present application is described in detail below in conjunction with accompanying drawing.
Fig. 1 is illustrated that the rough schematic view for the system architecture that can apply the embodiment of the present application.As shown in figure 1, this is
System framework can include：Client 11, base station 12, radio network controller (Radio Network Controller, RNC)
13rd, Serving GPRS Support Node (Serving GPRS Support Node, SGSN) 14, Gateway GPRS Support Node
(Gateway GPRS Support Node, GGSN) 15, internet probe (NET probe) 16, fire wall 17 and server
18。
Wherein, in concrete implementation, client 11 can be with mobile phone, tablet personal computer, notebook computer, super mobile personal
Computer (Ultra-mobile Personal Computer, UMPC), net book, personal digital assistant (Personal
Digital Assistant, PDA) etc..As a kind of embodiment, as shown in fig. 1, what the network architecture of the application included
Client 11 is notebook computer.Client 11 carries out radio communication with base station 12, and encrypted video stream is obtained from server 18.
Base station 12 and RNC13 is connected with each other, and RNC13 and SGSN14 is connected with each other, and SGSN14 and GGSN15 is connected with each other,
GGSN15 is connected with each other with fire wall 17, and fire wall 17 is connected with each other with server 18.
Internet probe 16, that is, intercept the network probe of network packet, for capturing, filtering, analyze data bag.This Shen
Please the internet probe 16 of embodiment be connected to link between RNC13 and SGSN14, and between SGSN14 and GGSN15
Link, to obtain the video slicing for the encrypted video stream that client 11 is asked from server 18, and to composition encrypted video stream
Each video slicing is estimated, to obtain the assessed value of each video slicing, then is obtained by the assessed value of each video slicing
To the comprehensive assessment value of encrypted video stream, to assess the quality of encrypted video stream.
The structural representation for a kind of computer equipment that Fig. 2 provides for the embodiment of the present application, as shown in Fig. 2 computer is set
It is standby to include at least one processor 21, memory 22, communication interface 23, communication bus 24.
Each component parts of computer equipment is specifically introduced with reference to Fig. 2：
Processor 21 is the control centre of computer equipment, can be a processor or multiple treatment elements
General designation.For example, processor 21 is a central processing unit (central processing unit, CPU) or spy
Determine integrated circuit (Application Specific Integrated Circuit, ASIC), or be arranged to implement this
Apply for one or more integrated circuits of embodiment, for example：One or more microprocessors (digital signal
Processor, DSP), or, one or more field programmable gate array (Field Programmable Gate Array,
FPGA)。
Wherein, processor 21 by operation or can perform and be stored in software program in memory 22, and call and deposit
Store up the data in memory 22, the various functions of execute server.
In concrete implementation, as a kind of embodiment, processor 21 can include in one or more CPU, such as Fig. 2
Shown CPU0 and CPU1.
In the specific implementation, such as a kind of embodiment, server can include multiple processors, shown in Fig. 2
Processor 21 and processor 25.Each in these processors can be a single core processor (single-CPU), also may be used
To be a polycaryon processor (multi-CPU).Here processor can refer to one or more equipment, circuit, and/or be used for
The process cores of processing data (such as computer program instructions).
Memory 22 can be read-only storage (read-only memory, ROM) or can store static information and instruction
Other kinds of static storage device, random access memory (random access memory, RAM) or letter can be stored
Breath and the other kinds of dynamic memory or EEPROM (Electrically of instruction
Erasable Programmable Read-Only Memory, EEPROM), read-only optical disc (Compact Disc Read-
Only Memory, CD-ROM) or other optical disc storages, laser disc storage (including compression laser disc, laser disc, laser disc, digital universal
Laser disc, Blu-ray Disc etc.), magnetic disk storage medium or other magnetic storage apparatus or can be used in carrying or store with referring to
The desired program code of order or data structure form and can by computer access any other medium, but not limited to this.
Memory 22 can be individually present, and be connected by communication bus 24 with processor 21.Memory 22 can also and processor
21 integrate.
Wherein, memory 22 is used to store the software program for performing application scheme, and is controlled by processor 21 to perform.
Communication interface 23, using the device of any class of transceiver one, for other equipment or communication, such as with
Too net, wireless access network (radio access network, RAN), WLAN (Wireless Local Area
Networks, WLAN) etc..Communication interface 23 can realize that receive capabilities, and transmitting element are realized and sent including receiving unit
Function.
Communication bus 24, can be industry standard architecture (Industry Standard Architecture, ISA)
Bus, external equipment interconnection (Peripheral Component, PCI) bus or extended industry-standard architecture
(Extended Industry Standard Architecture, EISA) bus etc..The bus can be divided into address bus,
Data/address bus, controlling bus etc..Only represented for ease of representing, in Fig. 2 with a thick line, it is not intended that only one bus or
A type of bus.
The device structure shown in Fig. 2 does not constitute the restriction to computer equipment, can include more more or more than illustrating
Few part, either combines some parts or different parts arrangement.
In the specific implementation, as a kind of embodiment, the computer equipment shown in Fig. 2 can be that the internet in Fig. 1 is visited
Pin.
Processor 21, for calling the instruction in memory 22 to perform following method：According to the smoothness of each video slicing
Affecting parameters and fluency model are spent, the fluency of each video slicing is estimated, to obtain the stream of each video slicing
Smooth degree assessed value, and according to the definition affecting parameters and definition model of each video slicing, to each video slicing
Definition is estimated, to obtain the intelligibility evaluation value of each video slicing.
The method that the processor 21 is performed also includes, and being worth to encryption according to the assessment of the fluency of each video slicing regards
The fluency assessed value of frequency stream, and the definition for being worth to encrypted video stream according to the intelligibility evaluation of each video slicing are commented
Valuation.
The method that the processor 21 is performed also includes, according to the fluency assessed value and encrypted video stream of encrypted video stream
Intelligibility evaluation value carry out comprehensive assessment, to obtain the comprehensive assessment value of encrypted video stream.
Memory 22, for store instruction.
The flow chart of the method for evaluating quality for a kind of encrypted video stream that Fig. 3 provides for the embodiment of the present application, such as Fig. 3 institutes
Show, this method can include：
101st, at least one video slicing is obtained.
It should be noted that sliced transmission is the fundamental characteristics of encrypted video stream, i.e., encrypted video stream would generally be divided
Transmitted in a network for some video slicings.At least one video slicing constitutes encrypted video stream.As client is playing encryption
During video flowing, client sends video slicing request, and server end sends corresponding video slicing to client.
As shown in figure 4, video slicing is data from the first period server end to client that sent at, the first period be client to
(n+1)th video slicing request that the n-th video slicing request that server end is sent is sent to client
Period, the period that n is T1 and T2 in the integer more than or equal to 1, i.e. Fig. 4.
102nd, the fluency affecting parameters of each video slicing and the definition affecting parameters of each video slicing are obtained.
It should be noted that fluency affecting parameters include traffic performance and the first pipe characteristic.Definition affecting parameters
Including traffic performance and second pipe characteristic.When obtaining the fluency affecting parameters of encrypted video stream, to each video
The code check of burst is assessed.There are wide cut mapping relations, the business of fluency affecting parameters in the definition of code check and video
Characteristic is the key characteristic of the definition affecting parameters of encrypted video stream.
Traffic performance, includes for characterizing the feature traffic performances of video slicing in itself：
Video slicing downloading duration feature, is the preset value of the downloading duration of downloading duration/video slicing of video slicing,
The downloading duration of video slicing is that client receives service at the time of sending video slicing request to client
At the time of the video slicing that device end is sent.After client sends video slicing request, server end can be as early as possible
The data of the video slicing of request are sent to client.When network quality is good, video slicing can be downloaded within a very short time
Complete, the downloading duration of video slicing only occupies the sub-fraction of the playable duration of video slicing, and video council is than smoother
Play；And when network quality is poor, the downloading duration of video slicing can be partially long, the downloading duration of video slicing will influence video
The fluency of broadcasting.For a play service, the downloading duration that statistical analysis can obtain video slicing is L1, video slicing
When downloading duration is noticeably greater than L1, then the smooth playing of video can be influenceed.
Video slicing downloads interval feature, is that interval/video between video slicing can play duration.User end to server
End is sent after video slicing request, and server end can send the data of the video slicing of request to client as early as possible, send
After the data asked into this video slicing next time, it will usually have regular hour gap, then server end, which is retransmited, regards
T2 in the data of frequency division piece, such as Fig. 4.But, when mounted mass is poor instantly, previous video burst has just downloaded completion, just must
Next video slicing must be downloaded at once, and the situation of smooth playing can not be supported by being otherwise likely to occur downloading data.Therefore, video
Gap between burst, can be considered the important indicator of video playback fluency.
Audio frequency and video fragment request success rate feature, is audio frequency and video fragment request success number/audio frequency and video request number, client
Hold to during server end transmission video slicing request, under normal circumstances, server end can correspond to the number for sending 1 audio frequency and video burst
According to.But, under the poor scene of network quality, server end response failure, no audio, video data is downloaded；Client repeatedly please
Seek common ground one section of audio frequency and video, cause that a certain fragment data is retransmitted repeatedly or part is repeated；Client asks same section of audio frequency and video repeatedly,
Some audio frequency and video bursts are caused to retransmit.So ask unsuccessfully more, then may more cause video playback not smooth.
Video slicing code check feature, is the code check of the video slicing of code check/the i-th -1 of the i-th video slicing, i be less than or equal to
The video slicing number of encrypted video stream.During encrypted video stream broadcasting, server end can be sent according to network condition to client
The video of phase code rate, to ensure the smooth playing of video, i.e., when network quality improves suddenly, the code check of video slicing can on
Rise, video smooth playing；When network quality is deteriorated suddenly, the code check of video slicing can be reduced, in fact it could happen that be played not smooth
Situation.
Player satisfaction feature, the data volume for needed for the amount of downloading data/broadcasting.Video slicing in downloading process,
Player can play foradownloaded video data with certain video code rate.Under normal condition, download is more than number needed for player
According to amount, then video smooth playing.When downloading rate can not meet video smooth playing, then interim card state is presented in player, depending on
Frequency plays not smooth, P1 to the P2 periods in Fig. 5.
First pipe characteristic, the feature for characterizing transmission encrypted video stream.First pipe characteristic includes：
Round-trip delay directly embodies the propagation delay time of network, and round-trip delay is smaller, and it is smaller that slack probability occurs for video；
Round-trip delay is bigger, may more occur not smooth.
Packet loss, is total bag number of number-of-packet/network transmission of Successful transmissions.Packet loss is bigger, encrypted video stream hair
Raw slack probability is bigger.
Up-downgoing speed ratio, is that requested data rates/server end that client is sent is sent out to client
The response data speed sent.Up-downgoing speed ratio is smaller to represent that client is sent after video slicing request, service
The data volume that device end is returned to client is bigger, and audio code rate is stable；Up-downgoing speed ratio it is bigger expression be probably greatly very much due to
There is substantial amounts of video slicing request response failure.
Maximum downstream rate reflects the maximum download capabilities of network, that is, supports the ability of video smooth playing.
Average downstream rate can embody the average bearing capacity of network, if current bit-rate video flow can be supported to broadcast
Put.
Average packet transmission rate has larger correlation with average downstream rate, but on the basis of average downstream rate,
The index can also embody bag transmission feature.Average packet transmission rate is bigger, and video smooth playing probability is bigger.
RST fields are distributed, and are the transmission control protocol flow amount/all transmission control protocols flow amount for tearing chain open with RST.
The distribution of RST fields represents that TCP transmission actively tears the distribution character of chain open, RST tear open chain accounting exist with video playback fluency it is larger
Association.
Second pipe characteristic, the feature for characterizing transmission video slicing.Second pipe characteristic includes：
Round-trip delay directly embodies the propagation delay time of network, reflects the bearing capacity of network.Round-trip delay is smaller, and data are passed
Transmission quality is better, and the definition of encrypted video is higher.
Packet loss, reflects the ability of data complete transmission, and packet loss is smaller, and video definition is higher.
Up-downgoing speed ratio, in the case where video slicing duration is certain, video slicing data volume is bigger, and video is more clear
It is clear.
Maximum downstream rate embodies network to the maximum load-carrying capacity of video data, can carry utmost sharpness video
Ability.
The average definition for the video that average downstream rate reflection network can be carried.
Average parlor is divided into the bag transmission total bag number of total time-consuming/transmission.Average inter-packet gap is bigger, and video definition is poorer.
103rd, according to the fluency affecting parameters and fluency model of each video slicing, to the smoothness of each video slicing
Degree is estimated, to obtain the fluency assessed value of each video slicing, and is influenceed according to the definition of each video slicing
Parameter and definition model, the definition to each video slicing are estimated, and are commented with the definition for obtaining each video slicing
Valuation.
It should be noted that those skilled in the art can first obtain some sample datas, i.e., gathered from network side
The video slicing of encrypted video stream, then, extracts the traffic performance and the first pipe characteristic of video slicing, specific extracting method
It may be referred to the detailed step in step 102, recycle machine learning language, such as random forest, training traffic performance and the
One pipe characteristic obtains a rule of a fluency from Feature Mapping to video slicing；Similarly, video slicing is extracted
Traffic performance and second pipe characteristic, specific extracting method may be referred to the detailed step in step 102, recycle engineering
Idiom says that such as random forest, training traffic performance and second pipe characteristic obtain one from Feature Mapping to video slicing
One rule of definition.The process of modeling is the process of Training above.Example, fluency assessed value can be set
1 point to 5 points is set to, 1 point of expression fluency extreme difference, by that analogy, 5 points of expression fluency are best.Or, fluency assessed value can
It is low to be set to high, neutralization.
104th, the fluency assessed value for being worth to encrypted video stream, Yi Jigen are assessed according to the fluency of each video slicing
The intelligibility evaluation value of encrypted video stream is worth to according to the intelligibility evaluation of each video slicing.
Because the fluency of each video slicing is different with definition, then, user deposits to the subjective feeling of video quality
More remote at iteration effect, i.e. distance assessment moment, the influence to assessment is smaller, and the distance assessment moment is nearer, the influence to assessment
It is bigger.Fluency assessed value and the specific computational methods of intelligibility evaluation value for one-time pad encryption video playback business is as follows：
The fluency assessed value of each video slicing is iterated using the first formula, to obtain the stream of encrypted video stream
Smooth to spend assessed value, the first formula is：
F (i)=ω * F (i-1)+(1- ω) * Fi, wherein, F (i) is the fluency assessed value of encrypted video stream, F (i-1)
For the fluency assessed value of the i-th -1 video slicing, FiFor the fluency assessed value of the i-th video slicing, ω is weight, and ω is more than 0
Less than 1.
It should be noted that when encrypted video stream only one of which video slicing, i.e., whole time play service only has 1 video point
During piece, the fluency assessed value of this business assesses initial value for fluency.If the i-th video slicing be encrypted video stream most
Latter video slicing, the fluency assessed value of the i-th video slicing is the fluency assessed value of the i-th -1 video slicing.Fluency
Assess initial value and could be arranged to 5.
The intelligibility evaluation value of each video slicing is iterated using the second formula, to obtain the clear of encrypted video stream
Clear degree assessed value, the second formula is：
C (i)=σ * C (i-1)+(1- σ) * Ci, wherein, C (i) is the intelligibility evaluation value of encrypted video stream, and C (i-1) is
The intelligibility evaluation value of i-th -1 video slicing, CiFor the intelligibility evaluation value of the i-th video slicing, σ is weight, and σ is less than more than 0
1。
It should be noted that when encrypted video stream only one of which video slicing, i.e., whole time play service only has 1 video point
During piece, the intelligibility evaluation value of this business is intelligibility evaluation initial value.If the i-th video slicing be encrypted video stream most
Latter video slicing, the intelligibility evaluation value of the i-th video slicing is the intelligibility evaluation value of the i-th -1 video slicing.Definition
Assess initial value and could be arranged to 5.
105th, integrate commenting according to the fluency assessed value of encrypted video stream and the intelligibility evaluation value of encrypted video stream
Estimate, to obtain the comprehensive assessment value of encrypted video stream.
Entered according to the intelligibility evaluation value of the fluency assessed value of encrypted video stream and encrypted video stream using the 3rd formula
Row comprehensive assessment, to obtain the comprehensive assessment value of encrypted video stream, the 3rd formula is：
S=f [F, C]=α * f+ (1- α) * C, wherein, S is the comprehensive assessment value of encrypted video stream, and F is encrypted video stream
Fluency assessed value, C is the intelligibility evaluation value of encrypted video stream, and α is weight, and α is more than 0.5 and is less than 1.
Comprehensive assessment value is higher, and the experience of encrypted video stream is better.It is influence user's viewing body due to playing smooth degree
The most crucial factor tested, the fitting weight of fluency is more than the fitting weight of definition, i.e. parameter alpha>0.5.
Further, for fluency assessed value, intelligibility evaluation value and comprehensive assessment value, different thresholds can be set respectively
Value, when fluency assessed value is higher than fluency threshold value, it is believed that video display process subjective experience is smoothness；Work as intelligibility evaluation
When value is higher than clarity threshold, it is believed that subjective experience is clear in video display process；When video synthesis assessed value is more than comprehensive
When closing threshold value, it is believed that video playback overall experience is good.
The embodiment of the present application provides a kind of method for evaluating quality of encrypted video stream, is added using fluency model by composition
The fluency affecting parameters of each video slicing of close video flowing, are estimated to the fluency of each video slicing, obtain every
The fluency assessed value of individual video slicing, and using definition model by constituting each video slicing of encrypted video stream
Definition affecting parameters, the definition to each video slicing is estimated, and obtains the intelligibility evaluation value of each video slicing,
The fluency assessed value of encrypted video stream is being worth to according to the assessment of the fluency of each video slicing, and according to each video
The intelligibility evaluation of burst is worth to the intelligibility evaluation value of encrypted video stream, according to the fluency assessed value of encrypted video stream and
The intelligibility evaluation value of encrypted video stream carries out comprehensive assessment, to obtain the comprehensive assessment value of encrypted video stream, so as to composition
Each video slicing of encrypted video stream is estimated, and to obtain the assessed value of each video slicing, then passes through each video point
The assessment of piece is worth to the comprehensive assessment value of encrypted video stream, how efficiently solves in network side to the matter of encrypted video stream
The problem of amount is estimated.
Method and step shown in above-mentioned Fig. 3 specifically can be as shown in Figure 2 computer equipment realize.Example, step
Acquisition at least one video slicing described in 101 can be realized by communication interface 23.The each video of acquisition described in step 102
The fluency affecting parameters of burst and definition affecting parameters and step 103,104 and 105 of each video slicing can be by
Device 21 is managed to realize.
It should be noted that after the acquisition described in step 101 at least one video slicing, internet probe is to obtaining
To video slicing analyzed.The method for evaluating quality for another encrypted video stream that Fig. 6 provides for the embodiment of the present application
Flow chart, based on Fig. 3 as shown in fig. 6, specific include step in detailed below.
106th, the playable duration of each video slicing is obtained.
The playable duration of video slicing, the playing duration of the corresponding video content of as each video slicing.In network
In, the transmission of the video slicing of encrypted video stream is broadly divided into two classes：One kind is audio burst and video slicing individual transmission, i.e.,
Client is asked after a video slicing, and server end is retransmited after the video slicing of request is returned to client
The corresponding audio burst of the video slicing；It is another to be combined transmission for audio burst and video slicing.Wherein, it is main in existing network
The scene of stream is that audio burst is separately transmitted with video slicing, such as Apple dynamic code rates adaptive technique (HTTP Live
Streaming, HLS) flow and HTTP dynamic self-adaptings Streaming Media (Dynamic Adaptive Streaming over
HTTP, DASH flow).It is that audio ＆ video is combined transmission, such as progressive download (HTTP in the presence of a small amount of scene
Progressive Download, HPD) flow and part live scene.
Specifically, when audio burst and video slicing individual transmission, performing step 106a and 106b；When audio burst and
When video slicing is transmitted together, step 106c is performed.
106a, the playable duration for obtaining audio burst and audio burst.
106b, the playable duration according to the playable duration of audio burst estimation video slicing.
Audio burst and video slicing are corresponded, i.e. client request audio burst and video slicing
When, the quantity of audio burst and video slicing, and burst length are consistent.Moreover, for a same video playback business,
All video slicings and audio burst are regular length, you can playing duration.Root is it was found that the video point of all HLS flows
Leaf length is about first threshold, and the video slicing length of all DASH flows is about Second Threshold, first threshold and Second Threshold
For definite value, directly it can be obtained by video sample statistics.Secondly, for a same video playback business, code between video slicing
Rate is changed greatly, but code check is consistent substantially between audio burst.Due to the audio burst duration one with a play service
Cause, in the case where code check keeps constant, the data volume size of audio burst is held essentially constant.Due to audio burst code check
Stability, data analysis is done to audio sample, can estimate can play for audio burst according to the data volume size of audio burst
Duration, that is to say the playable duration of video slicing.
106c, the playable duration that the first period was defined as to video slicing.
First period was that the n-th video slicing request that client is sent is sent out to client
The period for the (n+1)th video slicing request sent.
Whole play service is generally divided into some video slicings by HPD flows, may there was only 1 video slicing, each
Video slicing can play duration, moreover, the playable duration of video slicing is noticeably greater than the video point of other various scenes
The playable duration of piece.If whole play service only exists 1 video slicing, the downloading duration of this video slicing is regarded
For the playable duration of video slicing, the T in such as Fig. 41.The number of video slicing be more than 1 when, each video slicing can play
T in the durations of Shi Changwei twice between client request data, such as Fig. 41+T2。
107th, the data volume of each video slicing is obtained.
Video slicing data volume can directly be obtained from the video slicing of transmission.
108th, the code check of each video slicing is obtained.
The code check of video slicing, is the playable duration of data volume/video slicing of video slicing.Code check is transmission per second
Bit number, when the bit number of transmission per second is more, the speed of data transfer is faster.
Method and step shown in above-mentioned Fig. 6 specifically can be as shown in Figure 2 computer equipment realize.Example, step
The data volume of each video slicing of acquisition described in the playable duration of each video slicing of acquisition described in 106, step 107 with
And the code check of each video slicing of acquisition described in step 108 can be realized by processor 21.
Those skilled in the art should be readily appreciated that, each example described with reference to the embodiments described herein
Algorithm steps, the embodiment of the present application can be realized with the combining form of hardware or hardware and computer software.Some function is studied carefully
Unexpectedly performed in the way of hardware or computer software driving hardware, application-specific and design constraint depending on technical scheme
Condition.Professional and technical personnel can realize described function to each specific application using distinct methods, but this
Plant and realize it is not considered that beyond scope of the present application.
The embodiment of the present application can carry out the division of functional module according to above method example to internet probe, for example,
Each function can be corresponded to and divide each functional module, two or more functions can also be integrated in a processing mould
In block.Above-mentioned integrated module can both be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.
It should be noted that be schematical, only a kind of division of logic function to the division of module in the embodiment of the present application, it is actual
There can be other dividing mode when realizing.
In the case where dividing each functional module using each corresponding function, Fig. 7 shows in above-mentioned and embodiment and related to
And encrypted video stream quality assessment device a kind of possible composition schematic diagram, as shown in fig. 7, the matter of the encrypted video stream
Amount apparatus for evaluating can include：Acquiring unit 201 and processing unit 202.
Wherein, acquiring unit 201, for obtaining at least one video slicing, the video slicing is within the first period
The data that server end is sent to client, first period is the n-th that the client is sent to the server end
The period for (n+1)th video slicing request that video slicing request is sent to the client to the server end, the n is
Integer more than or equal to 1, at least one described video slicing constitutes encrypted video stream.
Acquiring unit 201, be additionally operable to obtain each video slicing fluency affecting parameters and each video slicing it is clear
Clear degree affecting parameters, fluency affecting parameters include traffic performance and the first pipe characteristic, and definition affecting parameters include business
Characteristic and second pipe characteristic, traffic performance, for characterizing the feature of video slicing in itself, the first pipe characteristic, for characterizing
Transmit the feature of video slicing, second pipe characteristic, the feature for characterizing transmission video slicing.
Processing unit 202, for the fluency affecting parameters and fluency model according to each video slicing, is regarded to each
The fluency of frequency division piece is estimated, to obtain the fluency assessed value of each video slicing, and according to each video slicing
Definition affecting parameters and definition model, the definition to each video slicing is estimated, to obtain each video point
The intelligibility evaluation value of piece.
Processing unit 202, is additionally operable to assess the smoothness for being worth to encrypted video stream according to the fluency of each video slicing
Assessed value is spent, and is worth to according to the intelligibility evaluation of each video slicing the intelligibility evaluation value of encrypted video stream.
Processing unit 202, is additionally operable to be commented according to the fluency assessed value of encrypted video stream and the definition of encrypted video stream
Valuation carries out comprehensive assessment, to obtain the comprehensive assessment value of encrypted video stream.
It should be noted that all related contents for each step that above method embodiment is related to can quote correspondence
The function description of functional module, will not be repeated here.
The quality assessment device for the encrypted video stream that the embodiment of the present application is provided, the matter for performing above-mentioned encrypted video stream
Appraisal procedure is measured, therefore the method for evaluating quality identical effect with above-mentioned encrypted video stream can be reached.
The embodiment of the present application provides a kind of method for evaluating quality of encrypted video stream, is added using fluency model by composition
The fluency affecting parameters of each video slicing of close video flowing, are estimated to the fluency of each video slicing, obtain every
The fluency assessed value of individual video slicing, and using definition model by constituting each video slicing of encrypted video stream
Definition affecting parameters, the definition to each video slicing is estimated, and obtains the intelligibility evaluation value of each video slicing,
The fluency assessed value of encrypted video stream is being worth to according to the assessment of the fluency of each video slicing, and according to each video
The intelligibility evaluation of burst is worth to the intelligibility evaluation value of encrypted video stream, according to the fluency assessed value of encrypted video stream and
The intelligibility evaluation value of encrypted video stream carries out comprehensive assessment, to obtain the comprehensive assessment value of encrypted video stream, so as to composition
Each video slicing of encrypted video stream is estimated, and to obtain the assessed value of each video slicing, then passes through each video point
The assessment of piece is worth to the comprehensive assessment value of encrypted video stream, how efficiently solves in network side to the matter of encrypted video stream
The problem of amount is estimated.
In the embodiment of the present application, the quality assessment device 20 of encrypted video stream is presented in the form of functional unit.
Here " unit " can refer to ASIC (application-specific integrated circuit,
ASIC), the processor and memory of circuit, the one or more softwares of execution or firmware program, integrated logic circuit, and/or its
He can provide the device of above-mentioned functions.In a simple embodiment, those skilled in the art is contemplated that encryption is regarded
The quality assessment device 20 of frequency stream can be using the form shown in Fig. 7.Acquiring unit 201, processing unit 202 can pass through Fig. 2
Computer equipment realize that specifically, acquiring unit 201 can realize by communication interface 23, processing unit 202 can be by
Reason device 21 is realized.
The quality assessment device structural representation for a kind of encrypted video stream that Fig. 8 provides for the embodiment of the present application, such as Fig. 8 institutes
Show, including：Training process and test process.Wherein, sample data is input to characteristic extracting module, and characteristic extracting module extracts sample
The fluency affecting parameters and definition affecting parameters of notebook data, fluency affecting parameters and definition affecting parameters are input to machine
Device learns language module, and machine learning language module is trained to fluency affecting parameters and definition affecting parameters, obtained
Fluency model and definition model, are training process above.Video slicing is input to characteristic extracting module, characteristic extracting module
Extract the fluency affecting parameters and definition affecting parameters of video slicing, the fluency affecting parameters and definition of video slicing
Affecting parameters are input to intelligibility evaluation value and fluency assessed value module, are regarded according to fluency model and definition model
The intelligibility evaluation value of frequency division piece and the fluency assessed value of video slicing, the intelligibility evaluation value and video slicing of video slicing
Fluency assessed value be input to the comprehensive assessment value module of encrypted video stream, be worth to according to the intelligibility evaluation of video slicing
The intelligibility evaluation value of encrypted video stream, the fluency assessment for being worth to encrypted video stream is assessed according to the fluency of video slicing
Value, assesses according to the fluency of the intelligibility evaluation value of encrypted video stream and encrypted video stream and is worth to comprehensive assessment value, the above
For test process.
Through the above description of the embodiments, it is apparent to those skilled in the art that, for description
It is convenient and succinct, can as needed will be upper only with the division progress of above-mentioned each functional module for example, in practical application
State function distribution to be completed by different functional modules, i.e., the internal structure of device is divided into different functional modules, to complete
All or part of function described above.
, can be by it in several embodiments provided herein, it should be understood that disclosed apparatus and method
Its mode is realized.For example, device embodiment described above is only schematical, for example, the module or unit
Divide, only a kind of division of logic function there can be other dividing mode when actually realizing, such as multiple units or component
Another device can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or
The coupling each other discussed or direct-coupling or communication connection can be the indirect couplings of device or unit by some interfaces
Close or communicate to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be a physical location or multiple physical locations, you can with positioned at a place, or can also be distributed to
Multiple different places.Some or all of unit therein can be selected to realize this embodiment scheme according to the actual needs
Purpose.
In addition, each functional unit in the application each embodiment can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or used
When, it can be stored in a read/write memory medium.Understood based on such, the technical scheme of the embodiment of the present application is substantially
The part contributed in other words to prior art or all or part of the technical scheme can be in the form of software products
Embody, the software product is stored in a storage medium, including some instructions are to cause an equipment (can be single
Piece machine, chip etc.) or processor (processor) perform all or part of step of the application each embodiment methods described.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (Read-Only Memory, ROM), arbitrary access are deposited
Reservoir (Random Access Memory, RAM), magnetic disc or CD etc. are various can be with the medium of store program codes.
It is described above, the only embodiment of the application, but the protection domain of the application is not limited thereto, and it is any
Change or replacement in the technical scope that the application is disclosed, should all cover within the protection domain of the application.Therefore, this Shen
Protection domain please should be based on the protection scope of the described claims.
Claims (14)
1. a kind of method for evaluating quality of encrypted video stream, it is characterised in that including：
At least one video slicing is obtained, the video slicing is the number sent at the first period server end to client
According to first period is that the client is arrived in the n-th video slicing request that the client is sent to the server end
The period of the (n+1)th video slicing request sent to the server end, the n is integer more than or equal to 1, it is described at least
One video slicing constitutes encrypted video stream；
Obtain the fluency affecting parameters of each video slicing and the definition affecting parameters of each video slicing, institute
Stating fluency affecting parameters includes traffic performance and the first pipe characteristic, and the definition affecting parameters include the traffic performance
With second pipe characteristic, the traffic performance, for characterizing the feature of the video slicing in itself, first pipe characteristic,
Feature for characterizing the transmission video slicing, the second pipe characteristic, the spy for characterizing the transmission video slicing
Levy；
According to the fluency affecting parameters and fluency model of each video slicing, to the smoothness of each video slicing
Degree is estimated, to obtain the fluency assessed value of each video slicing, and according to the clear of each video slicing
Clear degree affecting parameters and definition model, the definition to each video slicing is estimated, to obtain each described regard
The intelligibility evaluation value of frequency division piece, the fluency model is commented for the fluency affecting parameters of video slicing are mapped as into fluency
The rule of valuation, the definition model is the rule that the definition affecting parameters of video slicing are mapped as to intelligibility evaluation value
Then；
The fluency assessed value for being worth to the encrypted video stream, Yi Jigen are assessed according to the fluency of each video slicing
The intelligibility evaluation value of the encrypted video stream is worth to according to the intelligibility evaluation of each video slicing；
Integrate commenting according to the fluency assessed value of the encrypted video stream and the intelligibility evaluation value of the encrypted video stream
Estimate, to obtain the comprehensive assessment value of the encrypted video stream.
2. according to the method described in claim 1, it is characterised in that after at least one video slicing is obtained, methods described
Also include：
Obtain the playable duration of each video slicing；
Obtain the data volume of each video slicing；
The code check of each video slicing is obtained, the code check of the video slicing is data volume/video slicing of video slicing
Playable duration.
3. method according to claim 2, it is characterised in that the playable duration of each video slicing of the acquisition
Including：
When audio burst and the video slicing individual transmission, obtain audio burst and the audio burst it is playable when
It is long, the playable duration of the video slicing, the audio burst and institute are estimated according to the playable duration of the audio burst
State video slicing one-to-one corresponding；
When the audio burst and the video slicing are transmitted together, first period is defined as the video slicing
It can play duration.
4. method according to claim 3, it is characterised in that the traffic performance includes：
Video slicing downloading duration feature, be downloading duration/video slicing of the video slicing downloading duration it is pre-
If value, the downloading duration of the video slicing for the client to the server end send the video slicing request when
At the time of being carved into the client and receive the video slicing that the server end is sent；
Video slicing downloads interval feature, is that interval/video between the video slicing can play duration, the video can play
The summation of the playable duration of each video slicings of Shi Changwei；
Audio frequency and video fragment request success rate feature, is audio frequency and video fragment request success number/audio frequency and video request number；
Video slicing code check feature, is the code check of the video slicing of code check/the i-th -1 of the i-th video slicing, the i be less than or equal to
The number of the video slicing of the encrypted video stream；
Player satisfaction feature, the data volume for needed for the amount of downloading data/broadcasting.
5. method according to claim 4, it is characterised in that
First pipe characteristic includes：
Round-trip delay RTT, packet loss, up-downgoing speed ratio, maximum downstream rate, average downstream rate, average packet transmission rate
With the distribution of RST fields；
The second pipe characteristic includes：
It is the round-trip delay RTT, the packet loss, the up-downgoing speed ratio, the maximum downstream rate, described average descending
Speed and average inter-packet gap, the average inter-packet gap, for the bag transmission total bag number of total time-consuming/transmission.
6. the method according to any one of claim 2-5 claim, it is characterised in that regarded described in the basis is each
The fluency of frequency division piece assesses the fluency assessed value for being worth to the encrypted video stream, and according to each video slicing
Intelligibility evaluation be worth to the intelligibility evaluation value of the encrypted video stream and include：
The fluency assessed value of each video slicing is iterated using the first formula, to obtain the encrypted video stream
Fluency assessed value, first formula is：
F (i)=ω * F (i-1)+(1- ω) * Fi,
Wherein, the F (i) is the fluency assessed value of the encrypted video stream, and the F (i-1) is video slicing described in i-th -1
Fluency assessed value, the FiThe fluency assessed value of video slicing described in i-th, the ω is weight, and ω is less than more than 0
1；
The intelligibility evaluation value of each video slicing is iterated using the second formula, to obtain the encrypted video stream
Intelligibility evaluation value, second formula is：
C (i)=σ * C (i-1)+(1- σ) * Ci,
Wherein, the C (i) is the intelligibility evaluation value of the encrypted video stream, and the C (i-1) is video slicing described in i-th -1
Intelligibility evaluation value, the CiThe intelligibility evaluation value of video slicing described in i-th, the σ is weight, and σ is more than 0 and is less than 1.
7. the method according to any one of claim 1-6 claim, it is characterised in that described to be regarded according to the encryption
The fluency assessed value of frequency stream and the intelligibility evaluation value of the encrypted video stream carry out comprehensive assessment, are regarded with obtaining the encryption
The comprehensive assessment value of frequency stream includes：
It is described to utilize according to the fluency assessed value of the encrypted video stream and the intelligibility evaluation value of the encrypted video stream
Three formula carry out comprehensive assessment, and to obtain the comprehensive assessment value of the encrypted video stream, the 3rd formula is：
S=f [F, C]=α * f+ (1- α) * C,
Wherein, the S is the comprehensive assessment value of the encrypted video stream, and the F assesses for the fluency of the encrypted video stream
Value, the C is the intelligibility evaluation value of the encrypted video stream, and the α is weight, and α is more than 0.5 and is less than 1.
8. a kind of quality assessment device of encrypted video stream, it is characterised in that including：
Acquiring unit, for obtaining at least one video slicing, the video slicing is to visitor at the first period server end
The data that family end is sent, first period is that the n-th video slicing that the client is sent to the server end is asked
The period of the (n+1)th video slicing request sent to the client to the server end, the n is more than or equal to 1
Integer, at least one described video slicing constitutes encrypted video stream；
The acquiring unit, is additionally operable to obtain the fluency affecting parameters and each video slicing of each video slicing
Definition affecting parameters, the fluency affecting parameters include traffic performance and the first pipe characteristic, definition influence
Parameter includes the traffic performance and second pipe characteristic, the traffic performance, for characterizing the spy of the video slicing in itself
Levy, first pipe characteristic, the feature for characterizing the transmission video slicing, the second pipe characteristic, for characterizing
Transmit the feature of the video slicing；
Processing unit, for the fluency affecting parameters and fluency model according to each video slicing, to each described
The fluency of video slicing is estimated, to obtain the fluency assessed value of each video slicing, and according to each institute
The definition affecting parameters and definition model of video slicing are stated, the definition to each video slicing is estimated, with
The intelligibility evaluation value of each video slicing is obtained, the fluency model is by the fluency affecting parameters of video slicing
The rule of fluency assessed value is mapped as, the definition model is to be mapped as the definition affecting parameters of video slicing clearly
Spend the rule of assessed value；
The processing unit, is additionally operable to be worth to the encrypted video stream according to the fluency assessment of each video slicing
Fluency assessed value, and it is worth to according to the intelligibility evaluation of each video slicing the definition of the encrypted video stream
Assessed value；
The processing unit, is additionally operable to according to the clear of the fluency assessed value of the encrypted video stream and the encrypted video stream
Spend assessed value and carry out comprehensive assessment, to obtain the comprehensive assessment value of the encrypted video stream.
9. device according to claim 8, it is characterised in that the acquiring unit, is additionally operable to：
Obtain the playable duration of each video slicing；
Obtain the data volume of each video slicing；
The code check of each video slicing is obtained, the code check of the video slicing is data volume/video slicing of video slicing
Playable duration.
10. device according to claim 9, it is characterised in that the acquiring unit, specifically for：
When audio burst and the video slicing individual transmission, obtain audio burst and the audio burst it is playable when
It is long, the playable duration of the video slicing, the audio burst and institute are estimated according to the playable duration of the audio burst
State video slicing one-to-one corresponding；
When the audio burst and the video slicing are transmitted together, first period is defined as the video slicing
It can play duration.
11. device according to claim 10, it is characterised in that the traffic performance includes：
Video slicing downloading duration feature, be downloading duration/video slicing of the video slicing downloading duration it is pre-
If value, the downloading duration of the video slicing for the client to the server end send the video slicing request when
At the time of being carved into the client and receive the video slicing that the server end is sent；
Video slicing downloads interval feature, is that interval/video between the video slicing can play duration, the video can play
The summation of the playable duration of each video slicings of Shi Changwei；
Audio frequency and video fragment request success rate feature, is audio frequency and video fragment request success number/audio frequency and video request number；
Video slicing code check feature, is the code check of the video slicing of code check/the i-th -1 of the i-th video slicing, the i be less than or equal to
The number of the video slicing of the encrypted video stream；
Player satisfaction feature, the data volume for needed for the amount of downloading data/broadcasting.
12. device according to claim 11, it is characterised in that
First pipe characteristic includes：
Round-trip delay RTT, packet loss, up-downgoing speed ratio, maximum downstream rate, average downstream rate, average packet transmission rate
With the distribution of RST fields；
The second pipe characteristic includes：
It is the round-trip delay RTT, the packet loss, the up-downgoing speed ratio, the maximum downstream rate, described average descending
Speed and average inter-packet gap, the average inter-packet gap, for the bag transmission total bag number of total time-consuming/transmission.
13. the device according to any one of claim 8-12 claim, it is characterised in that the processing unit, tool
Body is used for：
The fluency assessed value of each video slicing is iterated using the first formula, to obtain the encrypted video stream
Fluency assessed value, first formula is：
F (i)=ω * F (i-1)+(1- ω) * Fi,
Wherein, the F (i) is the fluency assessed value of the encrypted video stream, and the F (i-1) is video slicing described in i-th -1
Fluency assessed value, the FiThe fluency assessed value of video slicing described in i-th, the ω is weight, and ω is less than more than 0
1；
The intelligibility evaluation value of each video slicing is iterated using the second formula, to obtain the encrypted video stream
Intelligibility evaluation value, second formula is：
C (i)=σ * C (i-1)+(1- σ) * Ci,
Wherein, the C (i) is the intelligibility evaluation value of the encrypted video stream, and the C (i-1) is video slicing described in i-th -1
Intelligibility evaluation value, the CiThe intelligibility evaluation value of video slicing described in i-th, the σ is weight, and σ is more than 0 and is less than 1.
14. the device according to any one of claim 8-13 claim, it is characterised in that the processing unit, tool
Body is used for：
It is described to utilize according to the fluency assessed value of the encrypted video stream and the intelligibility evaluation value of the encrypted video stream
Three formula carry out comprehensive assessment, and to obtain the comprehensive assessment value of the encrypted video stream, the 3rd formula is：
S=f [F, C]=α * f+ (1- α) * C,
Wherein, the S is the comprehensive assessment value of the encrypted video stream, and the F assesses for the fluency of the encrypted video stream
Value, the C is the intelligibility evaluation value of the encrypted video stream, and the α is weight, and α is more than 0.5 and is less than 1.
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