CN106488175A - A kind of video transmission method - Google Patents
A kind of video transmission method Download PDFInfo
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Abstract
The present invention is applied to communication technical field, there is provided a kind of video transmission method, and methods described includes：Obtain the net-work parameter information that current network transmits this video image；Search the corresponding video coding parameter of described net-work parameter information, wherein, described video coding parameter and network transmission quality correlation, including code check and frame per second；The data volume being cached in real time according to described video image, the encoder bit rate of real-time adjustment itself；According to described encoder bit rate, described video image is encoded, generate video data bag；Transmit described video data bag.Solve in the real-time buffer data size of video image, it cannot be guaranteed that the reliability of video data real-time Transmission, reduce the problem of the quality of video, packet loss when reducing real-time video transmission can be maximized, obtain stable live video stream, thus both ensure that the reliability of video data real-time Transmission, also improve the quality of video.
Description
Technical field
The invention belongs to communication technical field, more particularly, to a kind of video transmission method.
Background technology
With the popularization of intelligent terminal, increasing people, by monitoring device, the information during registration of vehicle traveling, life
Become video.When there is traffic accident or traffic dispute, responsible party can be judged by checking video, therefore video is to solve to hand over
Logical accident or the vaild evidence of traffic dispute.
However, existing system is in transmission of video, it is impossible to ensure video data real-time Transmission in the case of unstable networks
Reliability, reduces the quality of video.Its reason is, in vehicle travel process, can be through different base stations, in difference
Base station between switch, the unstable of network can be caused, the phenomenons such as bandwidth fluctuation, delay jitter and packet loss occur, therefore can not
Ensure the reliability of video data real-time Transmission, therefore reduce the quality of the video after real-time Transmission.
Content of the invention
The purpose of the embodiment of the present invention is to provide a kind of video transmission method it is intended to existing video monitoring system, in video
It is impossible to ensure the reliability of video data real-time Transmission during the real-time buffer data size of image, reduce the problem of the quality of video.
The embodiment of the present invention is achieved in that a kind of video transmission method, including：
Obtain the net-work parameter information that current network transmits this video image；
Search the corresponding video coding parameter of described net-work parameter information, wherein, described video coding parameter and network transmission quality
Correlation, including code check and frame per second；
The data volume being cached in real time according to described video image, the encoder bit rate of real-time adjustment itself；
According to described encoder bit rate, described video image is encoded, generate video data bag；
Transmit described video data bag.
In embodiments of the present invention, the data volume being cached in real time according to video image, the encoder bit rate of real-time adjustment itself；According to
Encoder bit rate, encodes to video image, generates video data bag；Transmitting video data bag.Avoid real in video image
When buffer data size when, occur it cannot be guaranteed that the reliability of video data real-time Transmission, reduce the problem of the quality of video, energy
Maximizing packet loss when reducing real-time video transmission, obtaining stable live video stream, thus both ensure that video data was real-time
The reliability of transmission, also improves the quality of video.
Brief description
Fig. 1 is the flowchart of video transmission method provided in an embodiment of the present invention；
Fig. 2 is the implementation process figure of video transmission method step S102 provided in an embodiment of the present invention；
Fig. 3 is the implementation process figure of step S201 provided in an embodiment of the present invention；
Fig. 4 is the implementation process figure of step S202 provided in an embodiment of the present invention；
Fig. 5 is the structured flowchart of video frequency transmitter provided in an embodiment of the present invention；
Fig. 6 is the structured flowchart of encoder bit rate adjusting module 53 in video frequency transmitter provided in an embodiment of the present invention；
Fig. 7 is the structured flowchart that in video frequency transmitter provided in an embodiment of the present invention, encoder bit rate reduces unit 531；
Fig. 8 is the structured flowchart that in video frequency transmitter provided in an embodiment of the present invention, encoder bit rate heightens unit 532.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, to this
Bright it is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and without
In the restriction present invention.
Embodiment one
Fig. 1 is the flowchart of video transmission method provided in an embodiment of the present invention, and details are as follows：
In step S101, obtain the net-work parameter information that current network transmits this video image；
In the present embodiment, need to obtain the net-work parameter information of reflection current network transmission quality in real time, online for user to meet
The needs of real-time transmission of video.Wherein, net-work parameter information will can reflect the quality of current network conditions.For example, network ginseng
Number information can be transmission bandwidth or the channel quality of current network.
In step s 102, search the corresponding video coding parameter of described net-work parameter information, wherein, described Video coding ginseng
Number and network transmission quality correlation, including code check and frame per second；
In the present embodiment, can be in the corresponding relation pre-building network information parameter and video coding parameter, including code check and frame
Rate.It should be noted that positive correlation should be become between network transmission quality and video coding parameter, that is, when network transmission matter
When measuring poor, corresponding coded video information should be larger, thus under different network transmission quality situations, is obtained according to actual
The network parameter got, finds corresponding to optimum coding parameter.
Further, between net-work parameter information and video coding parameter, corresponding relation can be specific functional relationship, also may be used
To be specific form mapping relations.
In step s 103, the data volume being cached in real time according to described video image, the encoder bit rate of real-time adjustment itself；
Wherein, the data volume of caching represents data cached levels of accumulation in buffer area in real time, directly utilizes and caches number in buffer area
According to levels of accumulation, real-time coding code check, the change of the network bandwidth is adapted to this, network added flow need not be increased, you can reach
To the purpose increasing reliability.For example, in the case of unstable networks, set up buffer area, cached by described buffer area current
Video image, by buffer area, can cache the video image not sent in time due to network congestion.
In step S104, according to described encoder bit rate, described video image is encoded, generate video data bag；
Any one video format existing can be adopted, described video image is encoded, generate video data bag, here is not done
Limit.
In step S105, transmit described video data bag.
Using the predetermined network transmission protocol, transmit described video data bag, the described network transmission protocol includes but is not limited to user
Datagram protocol (User Datagram Protocol, UDP), transmission control protocol (Transmission Control
Protocol, TCP).
In embodiments of the present invention, the data volume being cached in real time according to video image, the encoder bit rate of real-time adjustment itself；According to
Encoder bit rate, encodes to video image, generates video data bag；Transmitting video data bag.Avoid in unstable networks
In the case of, occur it cannot be guaranteed that the reliability of video data real-time Transmission, reduce the problem of the quality of video, can maximize and subtract
Packet loss during little real-time video transmission, obtains stable live video stream, thus both ensure that video data real-time Transmission can
By property, also improve the quality of video.
Embodiment two
Fig. 2 is the implementation process figure of video transmission method step S102 provided in an embodiment of the present invention, and details are as follows：
In step s 201, when the described data volume increase of caching in real time according to described video image, reduce itself in real time
Encoder bit rate, until described data volume is close to preset data amount；
Wherein, when the described data volume increase of caching in real time according to described video image, reduce the encoder bit rate of itself in real time,
And the corresponding relation according to self-defining described encoder bit rate and frame per second, accordingly reduce frame per second, to ensure the video matter of real-time Transmission
Amount.
In step S202, when the described data volume reduction of caching in real time according to described video image, heighten itself in real time
Encoder bit rate, until described data volume is close to preset data amount.
Wherein, when the described data volume reduction of caching in real time according to described video image, heighten the encoder bit rate of itself in real time,
And the corresponding relation according to self-defining described encoder bit rate and frame per second, accordingly heighten frame per second, to ensure the video matter of real-time Transmission
Amount.
In embodiments of the present invention, the data volume being cached in real time according to video image, the encoder bit rate of real-time adjustment itself；According to
Encoder bit rate, encodes to video image, generates video data bag；Transmitting video data bag.Can maximize to reduce and regard in real time
Packet loss when keeping pouring in defeated, obtains stable live video stream, thus both ensure that the reliability of video data real-time Transmission,
Improve the quality of video.
Embodiment three
Fig. 3 is the implementation process figure of step S201 provided in an embodiment of the present invention, and details are as follows：
In step S301, obtain the difference between the real-time writing speed of described video image and reading speed；
In step s 302, judge whether described difference is more than preset difference value in Preset Time；
In step S303, when whether difference described in Preset Time is more than preset difference value, represent that described video image is real
When the data volume that caches increase, reduce the encoder bit rate of itself in real time, until described data volume is close to preset data amount.
Wherein, within the sampling time reducing encoder bit rate, the difference of read-write pin and read pointer is sampled and counted, is passed through
Sampling statistics, when whether difference described in Preset Time is more than preset difference value, represent the number that described video image caches in real time
Increase according to amount, reduce the encoder bit rate of itself in real time.
For purposes of illustration only, taking practical application as a example, details are as follows：
Wherein, buffer area is made up of multiple buffer units, and the video data that H264 encoder time per unit produces is written to caching
One or more buffer units in area, data writing position write pointer represents, the size of each buffer unit is a fixed value,
As 1024byte；
One unit buffer unit is once sent to TCP transmit queue as a packet by read pointer, if write pointer and reading
The difference of pointer is less than a unit, then read pointer is set to waiting state；
The translational speed of write pointer is affected by encoder bit rate, and the speed of read pointer is sent code check by TCP and affected, network state
Poorer, then drop probabilities are big, then encoder bit rate should be adjusted to less, that is, reduces encoder bit rate.
In embodiments of the present invention, stablizing as far as possible and smooth for real-time video, reducing encoder bit rate is quick response,
The sampling time therefore reducing encoder bit rate is shorter than the sampling time raising encoder bit rate, by reducing encoder bit rate, can be maximum
Changing packet loss when reducing real-time video transmission, obtaining stable live video stream, thus both ensure that video data real-time Transmission
Reliability, also improve the quality of video.
Example IV
Fig. 4 is the implementation process figure of step S202 provided in an embodiment of the present invention, and details are as follows：
In step S401, obtain the difference between the real-time writing speed of described video image and reading speed；
Writing speed is the value of write pointer, and reading speed is the value of read pointer.
In step S402, judge whether described difference is not more than preset difference value in Preset Time；
In step S403, when whether difference described in Preset Time is not more than preset difference value, represent described video image
The data volume of caching reduces in real time, heightens the encoder bit rate of itself in real time, until described data volume is close to preset data amount.
Wherein, within the sampling time raising encoder bit rate, the difference of read-write pin and read pointer is sampled and counted, is passed through
Sampling statistics, when whether difference described in Preset Time is not more than preset difference value, represent what described video image cached in real time
Data volume reduces, and heightens the encoder bit rate of itself in real time.
Wherein, the sampling time raising encoder bit rate is longer than the sampling time reducing encoder bit rate.
For purposes of illustration only, taking practical application as a example, details are as follows：
Wherein, buffer area is made up of multiple buffer units, and the video data that H264 encoder time per unit produces is written to caching
One or more buffer units in area, data writing position write pointer represents, the size of each buffer unit is a fixed value,
As 1024byte；
One unit buffer unit is once sent to TCP transmit queue as a packet by read pointer, if write pointer and reading
The difference of pointer is less than a unit, then read pointer is set to waiting state；
The translational speed of write pointer is affected by encoder bit rate, and the speed of read pointer is sent code check by TCP and affected, if network
State is better, then the speed of TCP transmission video data is faster, and the speed reading video data is faster, allows for encoder to encode
More video datas, that is, encoder bit rate can be adjusted to bigger, frame per second can also tune up；
If the difference of write pointer and read pointer is more than 0 and is similar to the size of whole buffer area then it represents that TCP in the unit interval
The video data volume sending is less than the video data of coding generation it should reduce encoder bit rate；If write pointer and the difference of read pointer
It is worth for keeping difference to be 0 in 0, and a period of time, then raise encoder bit rate；
In embodiments of the present invention, stablizing as far as possible and smooth for real-time video, raising encoder bit rate is slow response,
The sampling time therefore raising encoder bit rate is longer than the sampling time reducing encoder bit rate, by raising encoder bit rate, can subtract
In the case of packet loss during little real-time video transmission, improving transmission speed, obtaining stable live video stream, thus both ensureing
The reliability of video data real-time Transmission, also improves the quality of video.
Embodiment five
What the present embodiment essentially described transmission of video in actual applications realizes flow process, and details are as follows：
1st, vehicle-mounted DVR is installed onboard, connects photographic head and 3G antenna, plug wireless 3G card, to equipment normal on
Electricity, vehicle-mounted DVR normally starts；
2nd, after the normal electrifying startup of equipment, carry out 3G dialup networking, and register and be networked to video server；
3rd, open real-time video client, by client application equipment end real-time video, carry out real-time video monitoring；
4th, device coding produces real time video data, is sent to server by wireless 3G, server is forwarded to client, visitor
Family end is decoded playing back；
5th, when device coding code check starts, an initial bit rate value can be given tacit consent to first, then can be according to the real time status of 3G network
Carry out self-adaption code rate adjustment, make full use of wireless network resource it is ensured that the transmission quality of real-time video to reach；
6th, after device coding produces and regards real-time frequency evidence, server is sent to by Transmission Control Protocol, in application layer application buffer area,
And the read-write pointer of difference set buffer area, the difference that buffer area reads and writes pointer is sent according to real time video data application layer, i.e. profit
The levels of accumulation data cached with sending buffer area, the encoder bit rate of real-time adjustment transmitting terminal, the change of the network bandwidth is adapted to this,
Network added flow need not be increased；
7th, send buffer area to be made up of multiple buffer units, the video data that H264 encoder time per unit produces is written to ring
One or more buffer units of shape buffer area, data writing position write pointer represents, the size of each buffer unit is solid for one
Definite value, such as 1024byte, often write a certain amount of coding video frequency data, write pointer carries out corresponding shifting function；
8th, a unit buffer unit is once sent to TCP transmit queue as a packet by read pointer, if write pointer
It is less than a unit with the difference of read pointer, then read pointer is set to waiting state；
9th, the translational speed of write pointer is affected by encoder bit rate, and the speed of read pointer is sent code check by TCP and affected, if
Network state is better, then the speed of TCP transmission video data is faster, and the speed reading video data is faster, allows for encoder
Encode more video datas, that is, code check can be adjusted to more greatly, and frame per second can also tune up；On the contrary, network state is poorer, then lose
Bag probability is big, then code check should be adjusted to less, and frame per second also should reduce；
If the difference of 10 write pointers and read pointer is more than 0 and is similar to the size of whole buffer area then it represents that in the unit interval
The video data volume that TCP sends is less than the video data of coding generation it should reduce encoder bit rate；If write pointer and read pointer
Difference be 0, and a period of time in keep difference be 0, then should raise encoder bit rate；
11st, reduce encoder bit rate and raise two kinds of adjustable strategies that encoder bit rate is this self-adaption code rate adjustment algorithm, regard when in real time
When the encoder bit rate of frequency is more than the transmission code rate of network, carry out reducing encoder bit rate adjustment, pass when Video Coding is less than network
During defeated code check, the encoder bit rate being raised adjusts.In practice, for stable and smooth as far as possible, the reduction of real-time video
Encoder bit rate is quick response, but raising encoder bit rate is slow response, that is, raising encoder bit rate is to need to wait network to put down
Surely certain period is just adjusted；
Although 12 reduction encoder bit rates are quick responses, and raising encoder bit rate is slow response, two kinds of code adjustment plans
Slightly it is required for carrying out sampling statistics, that is, by the sampling statistics of the read-write pointer position difference of certain period, to judge whether to
Encoder bit rate adjustment response, and the sampling time raising encoder bit rate is longer than the sampling time reducing encoder bit rate；
13rd, while taking encoder bit rate adjustment, in order to ensure real-time video quality, mutually reply frame per second is also carried out adjusting, code check
Reduce frame per second during reduction, when code check raises, increase frame per second；
Embodiment six
Fig. 5 is the structured flowchart of video frequency transmitter provided in an embodiment of the present invention, and this device can run on video monitoring equipment
In.For convenience of description, illustrate only part related to the present embodiment.
Reference Fig. 5, this video frequency transmitter, including：
Net-work parameter information acquisition module 51, transmits the net-work parameter information of this video image for obtaining current network；
Video coding parameter searching modul 52, for searching the corresponding video coding parameter of described net-work parameter information, wherein, institute
State video coding parameter and network transmission quality correlation, including code check and frame per second；
Encoder bit rate adjusting module 53, for the data volume being cached in real time according to described video image, the coding of real-time adjustment itself
Code check；
Video data bag generation module 54, for according to described encoder bit rate, encoding to described video image, generates video
Packet；
Video data bag transport module 55, for transmitting described video data bag.
In a kind of implementation of the present embodiment, in this video frequency transmitter, described video image cache module 51 is specifically used
In in the case of unstable networks, set up buffer area, by the current video image of described buffer area caching.
In a kind of implementation of the present embodiment, with reference to Fig. 6, Fig. 6 is in video frequency transmitter provided in an embodiment of the present invention
The structured flowchart of encoder bit rate adjusting module 53, in this video frequency transmitter, described encoder bit rate adjusting module 53 includes：
Encoder bit rate reduces unit 531, for when the described data volume according to the real-time caching of described video image increases, in real time
Reduce the encoder bit rate of itself, until described data volume is close to preset data amount；
Encoder bit rate heightens unit 532, for when the described data volume according to the real-time caching of described video image reduces, in real time
Heighten the encoder bit rate of itself, until described data volume is close to preset data amount.
In a kind of implementation of the present embodiment, with reference to Fig. 7, Fig. 7 is in video frequency transmitter provided in an embodiment of the present invention
Encoder bit rate reduces the structured flowchart of unit 531, and in this video frequency transmitter, described encoder bit rate reduces unit 531 and includes：
First acquisition subelement 5311, for obtaining the difference between the real-time writing speed of described video image and reading speed；
First judgment sub-unit 5312, for judging whether described difference is more than preset difference value in Preset Time；
Encoder bit rate reduces subelement 5313, for when whether difference described in Preset Time is more than preset difference value, representing institute
State the data volume increase that video image caches in real time, reduce the encoder bit rate of itself in real time, until described data volume is close to present count
According to amount.
In a kind of implementation of the present embodiment, with reference to Fig. 8, Fig. 8 is in video frequency transmitter provided in an embodiment of the present invention
Encoder bit rate heightens the structured flowchart of unit 532, and in this video frequency transmitter, described encoder bit rate is heightened unit 532 and included：
Second acquisition subelement 5321, for obtaining the difference between the real-time writing speed of described video image and reading speed；
Second judgment sub-unit 5322, for judging whether described difference is not more than preset difference value in Preset Time；
Encoder bit rate heightens subelement 5323, for when whether difference described in Preset Time is not more than preset difference value, representing
The data volume that described video image caches in real time reduces, and heightens the encoder bit rate of itself in real time, until described data volume is close to default
Data volume.
Device provided in an embodiment of the present invention can be applied in aforementioned corresponding embodiment of the method, and details are referring to above-described embodiment
Description, will not be described here.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be by software
Plus the mode of necessary common hardware is realizing.Described program can be stored in read/write memory medium, and described storage is situated between
Matter, such as random access memory, flash memory, read only memory, programmable read only memory, electrically erasable programmable memory, deposit
Device etc..This storage medium is located at memorizer, and processor reads the information in memorizer, and in conjunction with its hardware execution present invention, each is real
Apply the method described in example.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any it is familiar with this skill
The technical staff in art field the invention discloses technical scope in, the change or replacement that can readily occur in, all should cover at this
Within bright protection domain.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (5)
1. a kind of video transmission method is it is characterised in that include：
Obtain the net-work parameter information that current network transmits this video image；
Search the corresponding video coding parameter of described net-work parameter information, wherein, described video coding parameter with
Network transmission quality correlation, including code check and frame per second；
The data volume being cached in real time according to described video image, the encoder bit rate of real-time adjustment itself；
According to described encoder bit rate, described video image is encoded, generate video data bag；
Transmit described video data bag.
2. the method for claim 1 is it is characterised in that described acquisition current network transmits this video
The net-work parameter information of image, specially：
In the case of network link, set up buffer area, by the current video image of described buffer area caching；
And obtain the net-work parameter information caching this video image.
3. the method for claim 1 is it is characterised in that described delay in real time according to described video image
The data volume deposited, the encoder bit rate of real-time adjustment itself, specially：
When the described data volume increase of caching in real time according to described video image, reduce the coding of itself in real time
Code check, until described data volume is close to preset data amount；
When the described data volume reduction of caching in real time according to described video image, heighten the coding of itself in real time
Code check, until described data volume is close to preset data amount.
4. method as claimed in claim 3 it is characterised in that described when described according to described video image
When the data volume of caching increases in real time, reduce the encoder bit rate of itself in real time, until described data volume is close to pre-
If data volume, specially：
Obtain the difference between the real-time writing speed of described video image and reading speed；
Judge whether described difference is more than preset difference value in Preset Time；
When whether difference described in Preset Time is more than preset difference value, represent that described video image delays in real time
The data volume deposited increases, and reduces the encoder bit rate of itself in real time, until described data volume is close to preset data amount.
5. method as claimed in claim 3 it is characterised in that described when described according to described video image
When the data volume of caching reduces in real time, heighten the encoder bit rate of itself in real time, until described data volume is close to pre-
If data volume, specially：
Obtain the difference between the real-time writing speed of described video image and reading speed；
Judge whether described difference is not more than preset difference value in Preset Time；
When whether difference described in Preset Time is not more than preset difference value, represent that described video image is real-time
The data volume of caching reduces, and heightens the encoder bit rate of itself in real time, until described data volume is close to preset data
Amount.
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| CN109922307A (en) * | 2017-12-12 | 2019-06-21 | 杭州萤石软件有限公司 | A kind of multimedia data transmission method and video camera |
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Application publication date: 20170308 |