CN104125429B - The adjusting method and device of video data transmission - Google Patents
The adjusting method and device of video data transmission Download PDFInfo
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Abstract
The invention discloses the adjusting method and device of a kind of video data transmission, in the above-mentioned methods, it is determined whether into the period, which is the preset period for being inserted into key frame；Network operation status information according to getting determines whether to enter key frame in current period interpolation, wherein, enter key frame in current period interpolation for adjusting the code check of video data.According to technical solution provided by the invention, and then by being periodically inserted, key frame is timely, efficiently control the occupied bandwidth of video data transmitted and wireless network bandwidth dynamic is adapted.
Description
Technical field
The present invention relates to the communications field, in particular to the adjusting method and device of a kind of video data transmission.
Background technology
At present, in mobile video monitor field, due to can not be by wired mode transmitting real-time data, thus can only pass through
Mobile network's wireless mode carries out data transmission.But due to wireless network, i.e. mobile data network, such as：General point
Group wireless traffic（General Packet Radio Service, referred to as GPRS）, wideband code division multiple access（Wideband
Code Division Multiple Access, referred to as WCDMA）It is unstable, particularly under vehicle-mounted mobile environment, due to
The changeable environments such as base station range, fixed area number of users cause wireless network bandwidth fluctuation very big, thus for real-time
Property and fluency to require quite high long-distance video preview be extremely acid test.In order to corresponding with changeable network environment,
Video data must be made during transmission and correspondingly control, so that the occupied bandwidth of video data and wireless network
Network bandwidth accomplishes that dynamic is adapted as much as possible.
Fig. 1 is the structure diagram according to the video wireless remote prebrowsing system of the relevant technologies.As shown in Figure 1, video is wireless
Long-range prebrowsing system can be made of three parts, can specifically be included：Vehicle-mounted monitoring equipment, streaming media server and client
End.Vehicle-mounted monitoring equipment sends video data in real time for passing through wireless network；Streaming media server, for for multiple clients
End forwarding code stream；Client can be personal computer（PC）Client or cell-phone customer terminal, for being carried out to video data
It decodes and plays.It can be seen that the network bandwidth bottleneck of whole system is primarily present in vehicle-mounted monitoring equipment to streaming media service
The uplink stage of device.
In order to solve the problems, such as that it is following two that the control method of network bandwidth bottleneck generally use has in the relevant technologies：One
It is in the case where network environment runs down, only sends out key frame（I frames）Data.I frames are not dependent on other images, can be only
Decoded intracoded frame is found, in general as with reference to frame.I frames in code stream be usually with predetermined interval (such as：1
Second or 4 seconds) occur, decoding must be since I frame data.However the defects of such control method, is since decoding must
Must be since I frame data, therefore preview image dynamic continuity can be caused poor.The second is coding parameter is directly reduced, such as：
Frame per second, code check etc., if having a disadvantage in that, modification above-mentioned parameter value would generally generate new I frames, be sent out so as to cause code check amount moment
It is raw abnormal, anti-increasing is not dropped, and the occupied bandwidth of the video data transmitted can not preferably be controlled to be moved with wireless network bandwidth
State is adapted.
Invention content
The present invention provides the adjusting method and device of a kind of video data transmission, at least solve can not in the relevant technologies
The problem of occupied bandwidth of the video data transmitted is preferably controlled to be adapted with wireless network bandwidth dynamic.
According to an aspect of the invention, there is provided a kind of adjusting method of video data transmission.
The adjusting method of video data transmission according to the present invention includes：Determine whether to enter the period, which is default
Insertion key frame period；Network operation status information according to getting determines whether to enter key in current period interpolation
Frame, wherein, enter key frame in current period interpolation for adjusting the code check of video data.
Preferably, determine whether to enter key frame packet in current period interpolation according to the network operation status information got
It includes：The network performance index in current period is obtained, wherein, network performance index includes at least one below：Bandwidth availability ratio,
Network packet loss rate, transmission delay；Whether determined whether in current period more than the first predetermined threshold value according to network performance index
It is inserted into key frame.
Preferably, network performance index is obtained to include：Current network bandwidth is detected respectively in current period to regard with transmission
Frequency is according to occupied bandwidth；It calculates the difference of current network bandwidth and the occupied bandwidth of transmitting video data or calculates and pass
The ratio of the occupied bandwidth of defeated video data and current network bandwidth, obtains bandwidth availability ratio.
Preferably, network performance index is obtained to include：Detect the data packet of transmitting terminal transmission respectively in current period
The quantity of data packet that total amount is received with receiving terminal；According to the total amount of the data packet of transmission and the quantity of data packet received
Calculate network packet loss rate.
Preferably, network performance index is obtained to include：Transmitting terminal is detected in current period to send per frame video data packet
First time and detection transmitting terminal receive the of the confirmation packet that receiving terminal is fed back after receiving per frame video data packet
Two times；Transmission delay is calculated according to first time and the second time.
Preferably, whether more than the first predetermined threshold value determine whether to be inserted into current period according to network performance index
It is further included after key frame：If network performance index is more than or equal to the first predetermined threshold value, it is inserted into current period
Key frame；Since the period that first is inserted into key frame, the number for recording the period of insert continually key frame is first number；
When first number is greater than or equal to the second predetermined threshold value, then the grade of currently used coding parameter is promoted.
Preferably, whether more than the first predetermined threshold value determine whether to be inserted into current period according to network performance index
It is further included after key frame：If network performance index is less than the first predetermined threshold value, continue to keep current video data
Code check；Since first is not inserted into the period of key frame, the number that record is continuously not inserted into the period of key frame is second
Number；When second number is greater than or equal to third predetermined threshold value, then the grade of currently used coding parameter is reduced.
According to another aspect of the present invention, a kind of regulating device of video data transmission is provided.
The regulating device of video data transmission according to the present invention includes：First determining module is used to determine whether to enter
Period, the period are the preset period for being inserted into key frame；Second determining module, for according to the network operation shape got
State information determines whether to enter key frame in current period interpolation, wherein, enter key frame in current period interpolation for adjusting video
The code check of data.
Preferably, the second determining module includes：Acquiring unit, for obtaining the network performance index in current period,
In, network performance index includes at least one below：Bandwidth availability ratio, network packet loss rate, transmission delay；Determination unit is used for
Whether more than the first predetermined threshold value determine whether to enter key frame in current period interpolation according to network performance index.
Preferably, acquiring unit includes：First detection sub-unit, for detecting current network band respectively in current period
The wide and occupied bandwidth of transmitting video data；First computation subunit, for calculating current network bandwidth and transmission video counts
According to the difference of occupied bandwidth or the ratio of the occupied bandwidth of calculating transmitting video data and current network bandwidth, obtain
Bandwidth availability ratio.
Preferably, acquiring unit includes：Second detection sub-unit sends for detecting transmitting terminal respectively in current period
Data packet the quantity of data packet that receives of total amount and receiving terminal；Second computation subunit, for the data according to transmission
The quantity of the total amount of packet and the data packet received calculates network packet loss rate.
Preferably, acquiring unit includes：Third detection sub-unit is sent for detecting transmitting terminal in current period per frame
The first time of video data packet and detection transmitting terminal receive what receiving terminal was fed back after receiving per frame video data packet
Confirm the second time of packet；Third computation subunit, for calculating transmission delay according to first time and the second time.
Preferably, above device further includes：First processing module, for being more than or equal to first in network performance index
During predetermined threshold value, enter key frame in current period interpolation；First logging modle, for being opened from the period of first insertion key frame
Begin, the number for recording the period of insert continually key frame is first number；The first adjustment module, for being more than in first number or
During equal to the second predetermined threshold value, then the grade of currently used coding parameter is promoted.
Preferably, above device further includes：Second processing module, if being less than the first default threshold for network performance index
Value then continues to keep the code check of current video data；Second logging modle, for being not inserted into the period of key frame from first
Start, the number that record is continuously not inserted into the period of key frame is second number；Second adjustment module, for big in second number
When third predetermined threshold value, then the grade of currently used coding parameter is reduced.
By the present invention, using periodically detecting network operation status information, and in the preset week for being inserted into key frame
Phase determines whether to enter key frame in current period interpolation, work as when reaching according to the current network operation status information got
Preceding cycle interpolation, which enters key frame, the code check of video data is adjusted, and moved with the status information according to wireless network bandwidth
The occupied bandwidth of video data that state adjustment is being transmitted, solving can not preferably control what is transmitted in the relevant technologies
The problem of occupied bandwidth of video data is adapted with wireless network bandwidth dynamic, and then by being periodically inserted key frame
In time, it efficiently controls the occupied bandwidth of the video data transmitted and wireless network bandwidth dynamic is adapted.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and forms the part of the application, this hair
Bright illustrative embodiments and their description do not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the structure diagram according to the video wireless remote prebrowsing system of the relevant technologies；
Fig. 2 is the flow chart of the adjusting method of video data transmission according to embodiments of the present invention；
Fig. 3 is the flow chart of dynamic bandwidth self-adaptation control method according to the preferred embodiment of the invention；
Fig. 4 is the structure diagram of the regulating device of video data transmission according to embodiments of the present invention；
Fig. 5 is the structure diagram of the regulating device of video data transmission according to the preferred embodiment of the invention；
Fig. 6 is the structure diagram of the vehicle-mounted monitoring equipment in long-range prebrowsing system according to the preferred embodiment of the invention.
Specific embodiment
Come that the present invention will be described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be combined with each other.
In the following description, unless otherwise specified, by with reference to the action and behaviour performed by one or more computers
The symbolic indication of work describes present embodiments.Wherein, computer includes personal computer, server, mobile terminal
Etc. various products, used CPU, microcontroller, DSP etc. have processing chip equipment be properly termed as computer.Thus, it is possible to
Understand, this kind of action and operation that sometimes referred to as computer performs include the processing unit of computer to structured form table
The manipulation of the electric signal of registration evidence.It is safeguarded on this manipulation transforms data or position in the storage system of computer
It, this reconfigures or changes the operation of computer in a manner that those skilled in the art understands.Safeguard the data of data
Structure is the physical location of the memory with particular community defined in the form of data.However, although in above-mentioned context
Described in the present invention, but it does not mean restrictive, and as understood by those skilled in the art, described below is dynamic
Make and the various aspects of operation can also be realized with hardware.
Attached drawing is turned to, wherein identical reference label refers to identical element, the principle of the application is illustrated as in a conjunction
It is realized in suitable computing environment.It is described below based on the embodiments herein, and is not considered as about herein not
The alternative embodiment that is expressly recited and limit the application.
Following embodiment can be applied in computer, such as：It is applied in PC.It can also be applied to and employ intelligence at present
In mobile terminal in energy operating system, and it is not limited to this.For computer or mobile terminal operating system not
Particular/special requirement, as long as contact can be detected, determine whether the contact is consistent and the attribute according to the contact with pre-defined rule
Realize corresponding function.
Fig. 2 is the flow chart of the adjusting method of video data transmission according to embodiments of the present invention.As shown in Fig. 2, the party
Method can include following processing step：
Step S202：Determine whether to enter the period, which is the preset period for being inserted into key frame；
Step S204：Network operation status information according to getting determines whether to enter key frame in current period interpolation,
Wherein, enter key frame in current period interpolation for adjusting the code check of video data.
In the relevant technologies, the occupied bandwidth of the video data transmitted and wireless network bandwidth can not be preferably controlled
Dynamic is adapted.Using method as shown in Figure 2, network operation status information can be periodically detected（Such as：Network bandwidth
Utilization rate, the packet loss during video data transmission）, and when reaching in the preset period for being inserted into key frame according to acquisition
To current network operation status information determine whether to enter key frame in current period interpolation, enter key in current period interpolation
The code check of video data can be adjusted in frame, transmitted with the status information dynamic adjustment according to wireless network bandwidth
The occupied bandwidth of video data, it is occupied to solve the video data that can not preferably control and transmit in the relevant technologies
The problem of bandwidth is adapted with wireless network bandwidth dynamic, and then key frame is timely, efficiently controls by being periodically inserted
The occupied bandwidth of video data transmitted is adapted with wireless network bandwidth dynamic.
In a preferred implementation process, the interval of adjacent key frame in the initial state can be calculated according to preset frame rate,
In, multiple periods can be included in the interval.
Since key frame contains all information of display frame needs, all video datas all include at least one
A key frame, first frame as video file.Under normal conditions, each second video data at least needs to use a key
Frame.And other key frames can be used for improving the quality of video, but the quantity for increasing key frame can increase video file
Size, while can also increase the occupied network bandwidth of transmitting video data and network load.
Frame per second is how many frame in one second video played, and frame is the base unit for forming video.Video file is in itself
It is made of many continuous pictures, simply can be understood as frame per second is exactly the picture number under being recorded in one second（Actually
These pictures are by compression, and what a frame data not necessarily preserved is a full picture key frame, it is in interframe compression coding
Important frame.The interval of I frames adjusts and influences whether picture group（Group of Pictures, referred to as GOP）Length, and then
The speed for reading GOP is influenced, if the setting of I frame periods is excessive, may be forced with front and rear in the occasion for having to use I frames
Reference frame（B frames）/ forward reference frame（P frames）It replaces, will so reduce the quality of overall picture.I frames are interframe compressions
Basis, such as：One typical gop structure is IBBPBBPBBPBBPBBPBB, and B frames need to refer to the number of two frame of front and back
The data of this frame are obtained according to the variation plus this frame, and the explanation of P frames needs to refer to B frames.Assuming that I frames damage, then entire
Gop structure all will be unable to use, i.e. IBBPBBPBBPBBPBBPBB so multiframes will be slatterned together.
According to video coding algorithm, B frames and P frames are significantly greater than I frame data being carried out with compression treated data volume
Video pictures, by increasing frequency of the I frames in Video coding, can realize increases the mesh that video pictures show response speed
Mark.Coding is realized by headend equipment, can change the frequency of I frames in this way, while increase I frames in video data stream
Quantity, and then the video code flow after coding is increased, it thus can cause to increase demand of the video data to network bandwidth.Thus may be used
See, under the premise of video data is not changed to network bandwidth requirements, the video pictures that can substantially reduce video data are shown
Time interval, realize video data instant playback be a problem to be solved.
Code stream（Data Rate）, code check is also, refers to the data traffic that video file uses within the unit interval, is
Most important part in image quality control in Video coding.In the case where resolution ratio is identical, the code stream of video file is bigger,
For compression ratio with regard to smaller, image quality is higher.
In the relevant technologies, sample code can be carried out to video data stream first, I frames are then sent with fixed interval.
H.264 form is encoded to produce several I frames and several P frames generally use, wherein, an I frame and common group of several P frames
Into a picture group（GOP）, due in order to which client terminal is made to receive I frames as soon as possible, it will be understood by those skilled in the art that
Coded frame is being generated by encoder（The coded frame can include several I frames and the corresponding several P frames of each I frames）It
Afterwards, I frames are preferentially produced and are sent.In specific implementation procedure, first I frame is first sent, starts to send in first I frame data
Afterwards, fixed time intervals T, then start to send next I frame data, it is constantly repeated up to all I frame data of video data stream and passes
It is totally lost complete, wherein, the interval of I frames is determined by GOP, is exactly a picture group occupied time, such as：When GOP is 100,
Then between two I frames between be divided into 100 frames.If H.264 25 frames of coding per second, next I frames are generated to from a upper I frame
Generation need 100 frames/25 frames it is per second=4 seconds, therefore, above-mentioned time T is exactly 4 seconds, the sending times of former and later two I frames is 4 seconds.
In this is 4 seconds, network bandwidth is used for transmission the corresponding several P frames of each I frames, since in a picture group, I frames are key
Frame, it is therefore, higher for the transmission preferences rank of I frames, it to be sent to ensure that there are one I frames in every 4 seconds, several Ps corresponding with I frames
The transmission of frame can be delayed.If the transmission of I frames is ensured, consolidate sending and can be ensured that at the first time at lasting interval
It fixes time and sends I frames, receiving terminal can just receive I frames as soon as possible, so as to be decoded work to play video.
In the preferred embodiment, before video data starts transmission, the coding parameter of acquiescence can be adjusted,
Can I frame periods be arranged to by relatively large numerical value according to preset frame per second（More than generally use in the relevant technologies
1 second or 4 seconds, the transmission frame per second of video data stream and consolidating for I frame periods can be pre-set on digital video recorder
Certainty ratio is K）, the relative reduction of code check meeting at this time, when video complexity is higher, the dynamic effect of picture can become relatively poor.
Although I frame periods are configured to relatively large numerical value under initial situation, therefore the dynamic effect of picture can be affected,
But along with the network operation status information constantly got can periodically dynamic insertion I frames, and then change I frame periods,
Adjust the code check of video data.
It should be noted that since I frame periods are configured to relatively large numerical value, it can be included in I frame periods
Multiple preset periods for being inserted into I frames, such as：I frame periods can be arranged to 10 seconds according to preset frame per second, and preset
Insertion I frames period be 5 seconds, then in above-mentioned I frame periods can include 2 it is preset be inserted into I frames periods.And it specifically wraps
The number needs in the period contained are specifically set according to actual conditions.
Preferably, in step S204, determined whether in current period according to the network operation status information got
Following operation can be included by being inserted into key frame：
Step S1：The network performance index in current period is obtained, wherein, network performance index can include at least but not
It is limited to one below：Bandwidth availability ratio, network packet loss rate, transmission delay；
Step S2：Whether more than the first predetermined threshold value determine whether to enter the GATT in current period interpolation according to network performance index
Key frame.
Preferably, in step sl, network performance index is obtained may comprise steps of：
Step S11：Detect current network bandwidth and the occupied bandwidth of transmitting video data respectively in current period；
Step S12：It calculates the difference of current network bandwidth and the occupied bandwidth of transmitting video data or calculates and transmit
The ratio of the occupied bandwidth of video data and current network bandwidth obtains bandwidth availability ratio.
Preferably, in step sl, network performance index is obtained may comprise steps of：
Step S13：Detect what total amount and the receiving terminal of the data packet of transmitting terminal transmission received respectively in current period
The quantity of data packet；
Step S14：Network packet loss rate is calculated according to the quantity of the total amount of the data packet of transmission and the data packet received.
Preferably, in step sl, network performance index is obtained may comprise steps of：
Step S15：Transmitting terminal is detected in current period to send the first time per frame video data packet and detect hair
Sending end receives the second time of confirmation packet that receiving terminal is fed back after receiving per frame video data packet；
Step S16：Transmission delay is calculated according to first time and the second time.
In a preferred embodiment, before video data transmission is carried out, it is necessary first to judge video data institute to be sent
Whether the bandwidth of occupancy is more than network transfer tolerance.It therefore, can be respectively to current network bandwidth（Different types of network
Different network bandwidths can be possessed）And the occupied bandwidth of transmitting video data is detected, and ask for according to testing result
Current network bandwidth and the difference of the occupied bandwidth of transmitting video data, if the difference is more than or equal to above-mentioned first in advance
If threshold value, then illustrate that current network operating status is good, bandwidth resources, can be by entering the GATT compared with horn of plenty in current period interpolation
Key frame is to promote the code check of video data；If the difference is less than above-mentioned first predetermined threshold value, illustrate that current network runs shape
State is poor, and bandwidth resources are more nervous, is not suitable for being inserted into key frame in current period, is only capable of keeping current video data
Code check.
It is, of course, also possible to directly video data transmission amount size and network transfer tolerance are compared.If this is regarded
Frequency volume of transmitted data is less than or equal to network transfer tolerance, you can directly transmits above-mentioned video data, and if can
To determine that video data transmission amount much smaller than network transfer tolerance, then can enter key frame in current period interpolation；If depending on
Frequency volume of transmitted data is more than network transfer tolerance, you can above-mentioned video data is divided into multiple data packets, so that multiple
The size of each data packet in data packet is respectively less than or equal to network transfer tolerance.Such as：For network bandwidth only
For the network environment of 10Kbyte, the video data encoding frame of 100Kbyte sizes is just very likely sent out in transmission process
Raw packet loss, and then influence the stability of network transmission.Therefore, it is larger to the video data encoding frame of transmission, then for
For the network bandwidth of 10Kbyte, video data encoding frame can be divided into multiple data packets, the size of each data packet is
10Kbyte。
Preferably, in step S204, after current period interpolation enters key frame, can also include the following steps：
Step S3：If network performance index is more than or equal to the first predetermined threshold value, enter the GATT in current period interpolation
Key frame；
Step S4：Since the period that first is inserted into key frame, the number for recording the period of insert continually key frame is
First number；
Step S5：When first number is greater than or equal to the second predetermined threshold value, then currently used coding parameter is promoted
Grade.
In a preferred embodiment, if entering key frame in current period interpolation, then in next continuous multiple periods
The number in the interior period for being inserted into key frame that will hold the record, until can determine not being inserted into pass within some period wherein
Key frame, and judge whether the number in the period of insert continually key frame is greater than or equal to above-mentioned second predetermined threshold value, if it is,
Need to be promoted the grade of currently used coding parameter, to realize the adjusting to video data rate.
Such as：If it is determined that current（1st）Cycle interpolation enters key frame, then in next continuous 4 periods
It is interior（Do not include the 1st period）It holds the record the number in the period for being inserted into key frame, until can determine within the 6th period not
Key frame is inserted into, the number for therefore deducing that the period of insert continually key frame is 5.At this time, it may be necessary to judge continuously to insert
Enter the number in the period of key frame（5）Whether above-mentioned second predetermined threshold value is greater than or equal to（It is assumed to be 5）.Due to continuously inserting
Enter the period of key frame number be equal to above-mentioned second predetermined threshold value, therefore, can be promoted currently used coding parameter etc.
Grade, to realize the adjusting to video data rate.
It should be noted that the grade of currently used coding parameter can be two or more；If two, then
The respectively coding parameter grade and acquiescence of minimalist configuration（Highest）The coding parameter grade of configuration；It, then can be with if multiple
Multiple grades are added again between the coding parameter grade of minimalist configuration and the coding parameter grade of default configuration, to realize more
Accurately adjust the code check of video data.
Preferably, in step S204, after current period interpolation enters key frame, following operation can also be included：
Step S6：If network performance index is less than the first predetermined threshold value, continue to keep the code of current video data
Rate；
Step S7：Since first is not inserted into the period of key frame, record is continuously not inserted into the period of key frame
Number is second number；
Step S8：When second number is greater than or equal to third predetermined threshold value, then currently used coding parameter is reduced
Grade.
In a preferred embodiment, if being not inserted into key frame in current period, then next continuous multiple
Will hold the record the number in the period for being not inserted into key frame in period, until can determine to need within some period wherein
Key frame is inserted into, and judges whether the number for being continuously not inserted into the period of key frame is greater than or equal to above-mentioned third predetermined threshold value,
If it is, need to reduce the grade of currently used coding parameter, to realize the adjusting to video data rate.
Such as：If it can determine current（1st）Key frame is not inserted into period, then next continuous 4
In a period（Do not include the 1st period）Key frame is not inserted into, therefore the number in the period for being not inserted into key frame of holding the record,
Until can determine to reinsert key frame within the 6th period, the continuous period for being not inserted into key frame is therefore deduced that
Number is 5.At this time, it may be necessary to judge continuously to be not inserted into the number in the period of key frame（5）Whether above-mentioned the is greater than or equal to
Three predetermined threshold values（It is assumed to be 5）.Since the number in the period for being continuously not inserted into key frame is equal to above-mentioned third predetermined threshold value, because
This, can reduce the grade of currently used coding parameter, to realize the adjusting to video data rate.
It should be noted that above-mentioned first number may be the same or different with above-mentioned second number；Above-mentioned second is pre-
If threshold value may be the same or different with above-mentioned third predetermined threshold value, need specifically to be set according to actual conditions.
Above-mentioned preferred implementation process is further described with reference to preferred embodiment shown in Fig. 3.
Fig. 3 is the flow chart of dynamic bandwidth self-adaptation control method according to the preferred embodiment of the invention.As shown in figure 3,
This method can include following processing step：
Step S302：Vehicle-mounted monitoring equipment initializes related resource after connection is established with remote stream media server, accurate
It is standby to start to send video data；Vehicle-mounted monitoring equipment persistently obtains current network operation status information；
In the preferred embodiment, before video data starts transmission, the coding parameter of acquiescence can be adjusted,
A very big value can be arranged to according to preset frame per second by I frame periods by essentially consisting in, the relative reduction of code check meeting at this time,
When video complexity is higher, the dynamic effect of picture can become relatively poor.
It should be noted that the I frame periods of above-mentioned setting be not suitable for it is long, otherwise, it will lead to the dynamic effect of picture
Poor, the visual sensory of user is difficult to receive.
Step S304：Vehicle-mounted monitoring equipment can periodically detect the time point for whether having arrived at and being inserted into I frames；If
It is then to continue to execute step S306；If it is not, then return to step S302；
In the preferred embodiment, vehicle-mounted monitoring equipment can pre-set a cycle and be used for video data dynamic insertion
I frames improve the clarity and dynamic effect of video data with this.
Step S306：Vehicle-mounted monitoring equipment after video data starts transmission, by persistently to current mobile network into
Row detects and current network operation status information is assessed, still, due to can not quantitatively be commented the bandwidth of network
Estimate, therefore, the result finally fed back is the binaryzation net relative to the network operation state at currently transmitted video data
Network operating status, i.e., can be determined after assessing the current network operation status information current network conditions it is good or
It is bad；If current network operating status is good, step S308 is continued to execute；If it is not, then go to step S314；
Step S308：If it can determine current network conditions by assessing current network operation status information
Well, then illustrate that current network bandwidth disclosure satisfy that the occupied bandwidth of video data, it is possible thereby to be inserted into I frames in this period；
The number of statistics insert continually I frames is also needed to while I frames are inserted into, is denoted as insertCount at this time, for assessing in the past
A period of time in network persistent state；
In the preferred embodiment, it is assumed that can determine to be inserted into the meter of I frames, then insertCount in a cycle
Number becomes 1 from 0, can equally determine to be inserted into I frames in second period, then count is incremented by insertCount, becomes 2 from 1,
It can also determine to be inserted into I frames within the third period, then the counting of insertCount continues to add 1, becomes 3 from 2, and so on.
But if wherein there are one can determine that I frames, the counting termination of insertCount cannot be inserted into the period.
Step S310：It can decide whether that needs improve volume according to whether the counting of insertCount reaches predetermined threshold value
The grade of code parameter；If the counting of insertCount has reached predetermined threshold value（Such as：10）, then step can be continued to execute
Rapid S312；If the counting of insertCount is also not up to predetermined threshold value, step S320 can be gone to；
Step S312：The grade of coding parameter is improved, such as：This can be joined by being currently located in the coding parameter of the lowest class
Number restores to the grade of initial preset；Go to step S302；
Step S314：If it can determine current network conditions by assessing current network operation status information
When poor, then illustrate that current network bandwidth is difficult to meet the occupied bandwidth of video data, it is possible thereby to determine in current period
I frames are not inserted into, the code check of video data is reduced with this；Statistics is also needed to while I frames are not inserted into and is continuously not inserted into I frames
Number is denoted as notInsertCount at this time, is equally used for assessing the persistent state of the network within past a period of time；
Step S316：It can decide whether to need to improve according to whether the counting of notInsertCount reaches predetermined threshold value
The grade of coding parameter；If the counting of notInsertCount has reached predetermined threshold value（Such as：10）, then can continue to hold
Row step S318；If the counting of notInsertCount is also not up to predetermined threshold value, I frames are not inserted into current period,
Go to step S302；
Step S318：When notInsertCount reaches predetermined threshold value（Such as：10）When, illustrate current Network status very
Difference, the initially set maximum interval for being inserted into I frames can not carry out smooth transmission, informed code device needed to change coding at this time
Parameter reduces the current service rating of coding parameter, such as：It reduces limit bit rate, reduce frame per second；Until coding parameter is down to
Minimum service rating；Go to step S302；
It should be noted that even at above-mentioned reduction service rating（Including the lowest class）In the case of, it yet needs
Periodically to be judged whether to perform the operation for being inserted into I frames according to the network operation status information detected in real time.
Step S320：Continue to execute the operation for being inserted into I frames；Go to step S302.
Fig. 4 is the structure diagram of the regulating device of video data transmission according to embodiments of the present invention.It as shown in figure 4, should
The regulating device of video data transmission can include：First determining module 10 is used to determine whether that the period is pre- into the period
If insertion key frame period；Second determining module 20, for being determined to be according to the network operation status information got
It is no to enter key frame in current period interpolation, wherein, enter key frame in current period interpolation for adjusting the code check of video data.
Using device as shown in Figure 4, network operation status information can be periodically detected by acquisition module（Example
Such as：Packet loss during the utilization rate of network bandwidth, video data transmission）, and closed by determining module in preset be inserted into
The current network operation status information that the period of key frame can get when reaching according to acquisition module is determined whether current
Cycle interpolation enters key frame, and the code check of video data can be adjusted by entering key frame in current period interpolation, with according to nothing
The status information of line network bandwidth dynamically adjusts the occupied bandwidth of video data transmitted, and thus solves the relevant technologies
In the problem of occupied bandwidth of the video data transmitted and wireless network bandwidth dynamic can not preferably be controlled to be adapted,
And then by be periodically inserted key frame in time, efficiently control the occupied bandwidth of video data transmitted with it is wireless
Network bandwidth dynamic is adapted.
Preferably, as shown in figure 5, the second determining module 20 can include：Acquiring unit 200, for obtaining current period
Interior network performance index, wherein, network performance index includes at least one below：Bandwidth availability ratio, network packet loss rate, transmission
Delay；Determination unit 202, for whether being determined whether in current period more than the first predetermined threshold value according to network performance index
It is inserted into key frame.
Preferably, as shown in figure 5, acquiring unit 200 can include：First detection sub-unit（It is not shown in figure）, it is used for
Detect current network bandwidth and the occupied bandwidth of transmitting video data respectively in current period；First computation subunit（Figure
In be not shown）, regarded for calculating the difference of the occupied bandwidth of current network bandwidth and transmitting video data or calculating transmission
Frequency obtains bandwidth availability ratio according to occupied bandwidth and the ratio of current network bandwidth.
Preferably, as shown in figure 5, acquiring unit 200 can include：Second detection sub-unit（It is not shown in figure）, it is used for
Detect the quantity of data packet that the total amount of the data packet of transmitting terminal transmission is received with receiving terminal respectively in current period；Second
Computation subunit（It is not shown in figure）, net is calculated for the total amount of the data packet according to transmission and the quantity of the data packet received
Network packet loss.
Preferably, as shown in figure 5, acquiring unit 200 can include：Third detection sub-unit（It is not shown in figure）, it is used for
The first time and detection transmitting terminal that the every frame video data packet of transmitting terminal transmission is detected in current period receive receiving terminal
The second time of confirmation packet fed back after receiving per frame video data packet；Third computation subunit（It is not shown in figure）, use
According to first time and the second time calculating transmission delay.
Preferably, as shown in figure 5, above device can also include：First processing module 30, in network performance index
During more than or equal to the first predetermined threshold value, enter key frame in current period interpolation；First logging modle 40, for from first
The period of key frame is inserted into, the number for recording the period of insert continually key frame is first number；The first adjustment module 50,
For when first number is greater than or equal to the second predetermined threshold value, then promoting the grade of currently used coding parameter.
Preferably, as shown in figure 5, above device can also include：Second processing module 60, if referred to for network performance
Mark is less than the first predetermined threshold value, then continues to keep the code check of current video data；Second logging modle 70, for from first
The period of key frame is not inserted into, the number that record is continuously not inserted into the period of key frame is second number；Second adjustment mould
Block 80, for when second number is greater than or equal to third predetermined threshold value, then reducing the grade of currently used coding parameter.
Fig. 6 is the structure diagram of the vehicle-mounted monitoring equipment in long-range prebrowsing system according to the preferred embodiment of the invention.Such as
Shown in Fig. 6, which can include following four part：Image coding module, video data send module, network
State detection module（It is equivalent to above-mentioned acquisition module）And video data control module（It is equivalent to above-mentioned video data transmission
Rest part in regulating device in addition to acquisition module）.Image coded treatment is typically by digital signal processor
（Digital Signal Processor, referred to as DSP）It is responsible for；The transmission of video data can then use transmission control protocol
（Transfer Control Protocol, referred to as TCP）Or User Data Protocol（User Date Protocol, referred to as
For UDP）Video data is sent to streaming media server by wireless network；Network state detection can be by detecting meshwork buffering
The technologies such as area, transmission delay judge network operation state；Video data transmission control is technical solution provided by the present invention
Core, be that the adaptive main modular of dynamic network is used to implement in vehicle-mounted monitoring equipment.About in long-range prebrowsing system
The specific implementation procedure of vehicle-mounted monitoring equipment is as follows：
Before video data starts transmission, video data control module can be adjusted the coding parameter of acquiescence,
Can I frame periods be arranged to by a very big value according to preset frame per second, the relative reduction of code check meeting at this time, in video
The dynamic effect of picture can become relatively poor when complexity is higher.Vehicle-mounted monitoring equipment is established with remote stream media server
After connection, related resource is initialized.Image coding module can carry out sample code to video data stream, then compile video data
Code frame is sent to video data and sends module, and video data sends module preparation and starts to send video data.Vehicle-mounted monitoring equipment
In network state detection module persistently obtain current network operation state, video data control module can periodically detect
Whether the time point of being inserted into I frame is had arrived at；If so, network state detection module after video data starts transmission, is incited somebody to action
Persistently current mobile network is detected and current network operation state is assessed, still, due to can not be to net
The bandwidth of network carries out qualitative assessment, and therefore, the result finally fed back is the network at relative to currently transmitted video data
The binaryzation network operation state of operating status, i.e., can determine current net after assessing current network operation state
Network is in order or bad；If it can determine that current network conditions are good by assessing current network operation state
It is good, then illustrate that current network bandwidth disclosure satisfy that the occupied bandwidth of video data, it is possible thereby to be inserted into I frames in this period；
The number of statistics insert continually I frames is also needed to while being inserted into I frames, is continued for assessing the network within past a period of time
State；If can determine that current network conditions are poor by assessing current network operation state, illustrate to work as
Preceding network bandwidth is difficult to meet the occupied bandwidth of video data, it is possible thereby to determine to be not inserted into I frames in current period, is come with this
Reduce the code check of video data；The number that statistics is continuously not inserted into I frames is also needed to while I frames are not inserted into, is equally used for commenting
Estimate the persistent state of the network within past a period of time.Video data control module can be according to statistics insert continually I frames
Whether number reaches predetermined threshold value and then judges whether the grade for needing to improve coding parameter；If the counting has reached default
Threshold value（Such as：10）, then the grade of coding parameter can be improved, such as：Being currently located in the coding parameter of the lowest class can incite somebody to action
The Parameter reconstruction to initial preset grade；If the counting is also not up to predetermined threshold value, it can continue to execute and be inserted into I frames
Operation.Whether the number that video data control module can also continuously be not inserted into I frames according to statistics reaches predetermined threshold value so as to sentence
The disconnected grade for whether needing to improve coding parameter；If the counting has reached predetermined threshold value（Such as：10）, then illustrate currently
Network status is very poor, and the initially set maximum interval for being inserted into I frames can not carry out smooth transmission, need informed code at this time
Device changes coding parameter, reduces the current service rating of coding parameter, such as：It reduces limit bit rate, reduce frame per second；Until will compile
Code parameter minimizes service rating；If the counting is also not up to predetermined threshold value, I frames are not inserted into current period, so
Continued to obtain network operation status information in real time by network state detection module afterwards.
It should be noted that even at above-mentioned reduction service rating（Including the lowest class）In the case of, it yet needs
Periodically to be judged whether to perform the operation for being inserted into I frames according to the network operation status information detected in real time.
Using the vehicle-mounted monitoring equipment in long-range prebrowsing system as shown in Figure 6, in wireless video data network transmission
In performance optimization, it is put forward for the first time the control method of dynamic insertion I frames and using reduction or increase image coding parameter grade
Method in conjunction realizes the bandwidth self-adaption of changeable wireless network environment, is compared with the relevant technologies, can be with
Obtain better image fluency, lower code check, higher reduction code check response speed and method it is simple, effectively, be convenient for
Transplanting.
It can be seen from the above description that above example implements following technique effects（It should be noted that these
Effect is the effect that certain preferred embodiments can reach）：It can be in network bandwidth using technical solution provided by the present invention
The video data occupied bandwidth that control is being transmitted is automatically adjusted during reduction to be adapted with wireless network bandwidth dynamic,
It to ensure while video image real-time, can be a greater impact, adjust to avoid the dynamic continuity of video data
New I frames will not be generated in the process, and video data can effectively reduce the variation to adapt to network bandwidth.It is demonstrate,proved by actual test
It is bright, using the Control system architecture of the technical solution is simple, control is effective, the property of remote wireless video preview can be obviously improved
Energy.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Computing device realize that they can concentrate on single computing device or be distributed in multiple computing devices and be formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed in the storage device by computing device, and in some cases, it can be to be different from shown in sequence herein performs
The step of going out or describing they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.It to be combined in this way, the present invention is not limited to any specific hardware and softwares.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of adjusting method of video data transmission, which is characterized in that including：
The interval of adjacent key frame in the initial state is calculated according to preset frame rate, wherein, multiple periods are included in the interval；
Determine whether to enter the period, the period is the preset period for being inserted into key frame；
Network operation status information according to getting determines whether to be inserted into the key frame in current period, wherein, in institute
It states and the code check that the key frame is used to adjust the video data is inserted into current period；
The network operation status information according to getting determines whether to be inserted into the key frame in the current period, wrap
It includes：
The network performance index in the current period is obtained, wherein, the network performance index includes at least one below：Band
Wide utilization rate, network packet loss rate, transmission delay；
According to the network performance index whether more than the first predetermined threshold value determine whether in the current period be inserted into described in
Key frame；
Whether determine whether according to the network performance index in the current period interpolation more than first predetermined threshold value
After entering the key frame, further include：
If the network performance index is more than or equal to first predetermined threshold value, institute is inserted into the current period
State key frame；
Since the period that first is inserted into the key frame, the number for recording the period of key frame described in insert continually is first
Number；
When first number is greater than or equal to the second predetermined threshold value, then the grade of currently used coding parameter is promoted.
2. according to the method described in claim 1, include it is characterized in that, obtaining the network performance index：
Detect current network bandwidth and the occupied bandwidth of transmitting video data respectively in the current period；
The current network bandwidth is calculated with transmitting the difference of the occupied bandwidth of video data or calculating described in transmission
The occupied bandwidth of video data and the ratio of the current network bandwidth, obtain the bandwidth availability ratio.
3. according to the method described in claim 1, include it is characterized in that, obtaining the network performance index：
Detect the data packet that total amount and the receiving terminal of the data packet of transmitting terminal transmission receive respectively in the current period
Quantity；
The network packet loss rate is calculated according to the quantity of the total amount of the data packet of the transmission and the data packet received.
4. according to the method described in claim 1, include it is characterized in that, obtaining the network performance index：
Transmitting terminal is detected in the current period to send the first time per frame video data packet and detect the transmitting terminal
Receive the second time of confirmation packet that receiving terminal is fed back after the video data packet per frame is received；
The transmission delay is calculated according to the first time and second time.
5. method according to any one of claim 1 to 4, which is characterized in that be according to the network performance index
It is no to determine whether to be inserted into the current period after the key frame more than first predetermined threshold value, it further includes：
If the network performance index is less than first predetermined threshold value, continue to keep the code check of current video data；
Since the period that first is not inserted into the key frame, recording the number in period for being continuously not inserted into the key frame is
Second number；
When second number is greater than or equal to third predetermined threshold value, then the grade of currently used coding parameter is reduced.
6. a kind of regulating device of video data transmission, which is characterized in that including：
Computing module, for calculating the interval of adjacent key frame in the initial state according to preset frame rate, wherein, it is wrapped in the interval
Include multiple periods；
First determining module is used to determine whether to enter the period, period of the period for preset insertion key frame；
Second determining module, described in being determined whether to be inserted into current period according to the network operation status information got
Key frame, wherein, the key frame is inserted into the current period for adjusting the code check of the video data；
Second determining module includes：
Acquiring unit, for obtaining the network performance index in the current period, wherein, the network performance index at least wraps
Include one below：Bandwidth availability ratio, network packet loss rate, transmission delay；
Determination unit, for whether being determined whether according to the network performance index more than the first predetermined threshold value in the current week
The key frame is inserted into phase；
Described device further includes：
First processing module, for the network performance index be more than or equal to first predetermined threshold value when, described
The key frame is inserted into current period；
First logging modle, for since the period of first insertion key frame, recording key frame described in insert continually
Period number be first number；
The first adjustment module, for when first number is greater than or equal to the second predetermined threshold value, then being promoted currently used
The grade of coding parameter.
7. device according to claim 6, which is characterized in that the acquiring unit includes：
First detection sub-unit, for being detected respectively in the current period shared by current network bandwidth and transmitting video data
Bandwidth；
First computation subunit, for the difference for calculating the current network bandwidth with transmitting the occupied bandwidth of video data
Value calculates the ratio for transmitting the occupied bandwidth of video data and the current network bandwidth, obtains the bandwidth profit
With rate.
8. device according to claim 6, which is characterized in that the acquiring unit includes：
Second detection sub-unit, for detecting the total amount of the data packet of transmitting terminal transmission and reception respectively in the current period
Terminate the quantity of data packet received；
Second computation subunit, based on the total amount of the data packet according to the transmission and the quantity of the data packet received
Calculate the network packet loss rate.
9. device according to claim 6, which is characterized in that the acquiring unit includes：
Third detection sub-unit, for detecting the first time that transmitting terminal sends every frame video data packet in the current period
And it detects the transmitting terminal and receives receiving terminal is fed back after the video data packet per frame is received the second of confirmation packet
Time；
Third computation subunit, for calculating the transmission delay according to the first time and second time.
10. the device according to any one of claim 6 to 9, which is characterized in that described device further includes：
Second processing module if being less than first predetermined threshold value for the network performance index, continues to keep current
Video data code check；
Second logging modle, for be not inserted into the key frame since first period, record be continuously not inserted into the pass
The number in the period of key frame is second number；
Second adjustment module, for when second number is greater than or equal to third predetermined threshold value, then reducing currently used
The grade of coding parameter.
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| CN104618798B (en) * | 2015-02-12 | 2016-01-20 | 北京清源新创科技有限公司 | The broadcasting moment control method of Internet net cast and device |
| CN105025294B (en) * | 2015-08-03 | 2018-06-26 | 兴天通讯技术有限公司 | A kind of transmission of video control device and method |
| CN105072345B (en) * | 2015-08-25 | 2018-12-25 | 深圳市通则技术股份有限公司 | Method for video coding and device |
| CN108419103B (en) * | 2017-02-09 | 2020-01-17 | 杭州海康威视数字技术股份有限公司 | Video transmission method and device |
| CN106998328B (en) * | 2017-03-30 | 2019-12-13 | 北京奇艺世纪科技有限公司 | Video transmission method and device |
| CN110418175B (en) * | 2018-04-28 | 2021-10-26 | 华为技术有限公司 | Method for dynamically adjusting video transmission parameters through V2X and related product |
| CN110099250B (en) * | 2019-04-18 | 2021-02-02 | 浙江工业大学 | Monitoring video quality judgment method and play control device |
| CN111510735B (en) * | 2020-04-21 | 2022-11-01 | 新石器慧通（北京）科技有限公司 | Encoding transmission method and device for multi-channel video in weak network environment and unmanned vehicle |
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| CN111953613B (en) * | 2020-07-21 | 2024-02-23 | 西安万像电子科技有限公司 | Data transmission control method and device |
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| CN112261354B (en) * | 2020-09-04 | 2023-03-24 | 浙江大华技术股份有限公司 | Data transmission method based on multiple network cameras and related device |
| CN112188305A (en) * | 2020-09-29 | 2021-01-05 | 武汉大势智慧科技有限公司 | Network adjusting system and method for three-dimensional rendering |
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