CN204929081U - Video transmission device - Google Patents
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- CN204929081U CN204929081U CN201520647693.3U CN201520647693U CN204929081U CN 204929081 U CN204929081 U CN 204929081U CN 201520647693 U CN201520647693 U CN 201520647693U CN 204929081 U CN204929081 U CN 204929081U
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Abstract
The utility model is suitable for a communication technology field provides a video transmission device, the device includes: network parameter information acquisition module for acquire current this video image's of network transmission network parameter information, the module is seeked to the video coding parameter, is used for seeking the video coding parameter that network parameter information corresponds, wherein, video coding parameter and the network transmission quality relation of being proportionate are including code check and frame per second, code code check adjustment module is used for the basis self code code check is adjusted in real time to the data volume of the real -time buffer memory of video image, video data wraps generation module, is used for the basis the code code check, it is right video image encode generates the video data package, video data wraps transport module, is used for the transmission the video data package. The problem of when the real -time buffer memory data volume of video image, can not guarantee video data real time transport's reliability to have reduced video quality is solved, packet loss ratio when the ability maximize reduces the real -time video transmission obtains steady real -time video stream to both guarantee video data real time transport's reliability, also improved video quality.
Description
Technical field
The utility model belongs to communication technical field, particularly relates to a kind of video frequency transmitter.
Background technology
Along with popularizing of intelligent terminal, increasing people, by watch-dog, the information in registration of vehicle driving process, generating video.When there is traffic accident or traffic dispute, can by checking that video judges responsible party, therefore video is the vaild evidence of transport solution accident or traffic dispute.
But existing system, when transmission of video, in unstable networks situation, can not ensure the reliability of video data real-time Transmission, reduce the quality of video.Its reason is, in vehicle travel process, can through different base stations, switch between different base stations, the instability of network can be caused, there is the phenomenons such as bandwidth fluctuation, delay jitter and packet loss, therefore can not ensureing the reliability of video data real-time Transmission, because this reducing the quality of the video after real-time Transmission.
Utility model content
The object of the utility model embodiment is to provide a kind of video frequency transmitter, is intended to existing video monitoring system, when at video image real-time buffer data size, can not ensure the reliability of video data real-time Transmission, reduce the problem of the quality of video.
The utility model embodiment is achieved in that a kind of video frequency transmitter, comprising:
Net-work parameter information acquisition module, transmits the net-work parameter information of this video image for obtaining current network;
Video coding parameter searches module, and for searching video coding parameter corresponding to described net-work parameter information, wherein, described video coding parameter and network transmission quality correlation, comprise code check and frame per second;
Encoder bit rate adjusting module, for the data volume according to the real-time buffer memory of described video image, the encoder bit rate of adjustment in real time self;
Video packets of data generation module, for according to described encoder bit rate, encodes to described video image, generating video packet;
Video packets of data transport module, for transmitting described video packets of data.
In the utility model embodiment, according to the data volume of the real-time buffer memory of video image, the encoder bit rate of adjustment in real time self; According to encoder bit rate, video image is encoded, generating video packet; Transmitting video data bag.Avoid when the real-time buffer data size of video image, appearance can not ensure 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.
Accompanying drawing explanation
Fig. 1 is the realization flow figure of the video transmission method that the utility model embodiment provides;
Fig. 2 is the implementation process figure of the video transmission method step S102 that the utility model embodiment provides;
Fig. 3 is the implementation process figure of the step S201 that the utility model embodiment provides;
Fig. 4 is the implementation process figure of the step S202 that the utility model embodiment provides;
Fig. 5 is the structured flowchart of the video frequency transmitter that the utility model embodiment provides;
Fig. 6 is the structured flowchart of encoder bit rate adjusting module 53 in the video frequency transmitter that provides of the utility model embodiment;
Fig. 7 is the structured flowchart that in the video frequency transmitter that provides of the utility model embodiment, encoder bit rate reduces unit 531;
Fig. 8 is the structured flowchart that in the video frequency transmitter that provides of the utility model embodiment, encoder bit rate heightens unit 532.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
embodiment one
Fig. 1 is the realization flow figure of the video transmission method that the utility model embodiment provides, 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, Real-time Obtaining is needed to reflect the net-work parameter information of current network transmission quality, to meet the needs for the online real-time transmission of video of user.Wherein, net-work parameter information wants the quality that can reflect current network conditions.Such as, net-work parameter information can be transmission bandwidth or the channel quality of current network.
In step s 102, search the video coding parameter that described net-work parameter information is corresponding, wherein, described video coding parameter and network transmission quality correlation, comprise code check and frame per second;
In the present embodiment, setting up the corresponding relation of network information parameter and video coding parameter in advance, code check and frame per second can be comprised.It should be noted that, positive correlation should be become between network transmission quality with video coding parameter, namely when network transmission quality is poor, corresponding coded video information should be larger, thus under different network transmission quality situations, according to the actual network parameter got, find and correspond to optimum coding parameter.
Further, relation corresponding between net-work parameter information with video coding parameter can be concrete functional relation, also can be concrete form mapping relations.
In step s 103, according to the data volume of the real-time buffer memory of described video image, the encoder bit rate of adjustment in real time self;
Wherein, the data volume of real-time buffer memory represents levels of accumulation data cached in buffer area, directly utilizes levels of accumulation data cached in buffer area, real-time coding code check, adapt to the change of the network bandwidth with this, network added flow need not be increased, the object increasing reliability can be reached.Such as, in unstable networks situation, set up buffer area, by the video image that described buffer area buffer memory is current, by buffer area, can the video image that do not send in time due to network congestion of buffer memory.
In step S104, according to described encoder bit rate, described video image is encoded, generating video packet;
Can adopt any one video format existing, encode to described video image, generating video packet, does not limit at this.
In step S105, transmit described video packets of data.
Adopt the predetermined network transmission protocol, transmit described video packets of data, the described network transmission protocol includes but not limited to User Datagram Protoco (UDP) (UserDatagramProtocol, UDP), transmission control protocol (TransmissionControlProtocol, TCP).
In the utility model embodiment, according to the data volume of the real-time buffer memory of video image, the encoder bit rate of adjustment in real time self; According to encoder bit rate, video image is encoded, generating video packet; Transmitting video data bag.Avoid in unstable networks situation, appearance can not ensure 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.
embodiment two
Fig. 2 is the implementation process figure of the video transmission method step S102 that the utility model embodiment provides, and details are as follows:
In step s 201, when the described data volume according to the real-time buffer memory of described video image increases, reduce the encoder bit rate of self in real time, until described data volume is close to preset data amount;
Wherein, when the described data volume according to the real-time buffer memory of described video image increases, reduce the encoder bit rate of self in real time, and according to the corresponding relation of self-defining described encoder bit rate and frame per second, corresponding reduction frame per second, to ensure the video quality of real-time Transmission.
In step S202, when the described data volume according to the real-time buffer memory of described video image reduces, heighten the encoder bit rate of self in real time, until described data volume is close to preset data amount.
Wherein, when the described data volume according to the real-time buffer memory of described video image reduces, heighten the encoder bit rate of self in real time, and according to the corresponding relation of self-defining described encoder bit rate and frame per second, correspondingly heighten frame per second, to ensure the video quality of real-time Transmission.
In the utility model embodiment, according to the data volume of the real-time buffer memory of video image, the encoder bit rate of adjustment in real time self; According to encoder bit rate, video image is encoded, generating video packet; Transmitting video data bag.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.
embodiment three
Fig. 3 is the implementation process figure of the step S201 that the utility model embodiment provides, 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 greater than preset difference value in Preset Time;
In step S303, when whether difference described in Preset Time is greater than preset difference value, represents that the data volume of the real-time buffer memory of described video image increases, reduce the encoder bit rate of self in real time, until described data volume is close to preset data amount.
Wherein, within the sampling time of reducing encoder bit rate, the difference of read-write pin and read pointer is sampled and added up, by sampling statistics, when whether difference described in Preset Time is greater than preset difference value, represent that the data volume of the real-time buffer memory of described video image increases, reduce the encoder bit rate of self in real time.
For ease of illustrating, for practical application, details are as follows:
Wherein, buffer area is made up of multiple buffer unit, and the video data that H264 encoder time per unit produces writes one or more buffer units of buffer area, and data writing position write pointer represents, the size of each buffer unit is a fixed value, as 1024byte;
A unit buffer unit is once sent to TCP transmit queue as a packet by read pointer, if the difference of write pointer and read pointer is less than a unit, then read pointer is set to wait state;
The translational speed of write pointer affects by encoder bit rate, and the speed of read pointer sends the impact of code check by TCP, and network state is poorer, then drop probabilities is large, then encoder bit rate should be adjusted to less, namely reduces encoder bit rate.
In the utility model embodiment, stable as much as possible and level and smooth in order to real-time video, reducing encoder bit rate is response fast, the sampling time of therefore reducing encoder bit rate is shorter than the sampling time raising encoder bit rate, by reducing encoder bit rate, 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.
embodiment four
Fig. 4 is the implementation process figure of the step S202 that the utility model embodiment provides, 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, represents that the data volume of the real-time buffer memory of described video image reduces, heighten the encoder bit rate of self 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 added up, by sampling statistics, when whether difference described in Preset Time is not more than preset difference value, represent that the data volume of the real-time buffer memory of described video image reduces, heighten the encoder bit rate of self in real time.
Wherein, the sampling time raising encoder bit rate is longer than the sampling time of reducing encoder bit rate.
For ease of illustrating, for practical application, details are as follows:
Wherein, buffer area is made up of multiple buffer unit, and the video data that H264 encoder time per unit produces writes one or more buffer units of buffer area, and data writing position write pointer represents, the size of each buffer unit is a fixed value, as 1024byte;
A unit buffer unit is once sent to TCP transmit queue as a packet by read pointer, if the difference of write pointer and read pointer is less than a unit, then read pointer is set to wait state;
The translational speed of write pointer affects by encoder bit rate, and the speed of read pointer sends the impact of code check by TCP, if network state is better, then the speed of TCP transmission video data is faster, the speed reading video data is faster, just allow the more video data of encoder encodes, namely encoder bit rate can be adjusted to larger, and frame per second can also tune up;
If the difference of write pointer and read pointer is greater than 0 and be similar to the size of whole buffer area, then the video data volume that in the representation unit time, TCP sends is less than the video data that coding produces, and should reduce encoder bit rate; If the difference of write pointer and read pointer is 0, and keep difference to be 0 in a period of time, then raise encoder bit rate;
In the utility model embodiment, stable as much as possible and level and smooth in order to real-time video, raising encoder bit rate is slow response, therefore the sampling time raising encoder bit rate is longer than the sampling time of reducing encoder bit rate, by raising encoder bit rate, can packet loss when reduction real-time video transmission, improve transmission speed, obtain stable live video stream, thus both ensure that the reliability of video data real-time Transmission, also improve the quality of video.
embodiment five
The present embodiment essentially describes the realization flow of transmission of video in actual applications, and details are as follows:
1, install onboard by vehicle-mounted DVR, connect camera and 3G antenna, plug wireless 3G card, normally power on to equipment, vehicle-mounted DVR normally starts;
2, after the normal electrifying startup of equipment, carry out 3G dialup networking, and registration is networked to video server;
3, open real-time video client, by client application equipment end real-time video, carry out real-time video monitoring;
4, device coding produces real time video data, and be sent to server by wireless 3G, server is forwarded to client, and client carries out decoding playback;
5, when device coding code check starts, first can give tacit consent to an initial bit rate value, then can carry out self-adaption code rate adjustment according to the real time status of 3G network, make full use of wireless network resource to reach, ensure the transmission quality of real-time video;
6, after device coding produces and looks real-time audio data, server is mail to by Transmission Control Protocol, at application layer application buffer area, and the read-write pointer of difference set buffer area, send the difference of buffer area read-write pointer according to real time video data application layer, namely utilize and send the data cached levels of accumulation of buffer area, in real time the encoder bit rate of adjustment transmitting terminal, adapt to the change of the network bandwidth with this, network added flow need not be increased;
7, send buffer area to be made up of multiple buffer unit, the video data that H264 encoder time per unit produces writes one or more buffer units in Circular buffer district, data writing position write pointer represents, the size of each buffer unit is a fixed value, as 1024byte, often write a certain amount of coding video frequency data, write pointer carries out corresponding shifting function;
8, a unit buffer unit is once sent to TCP transmit queue as a packet by read pointer, if the difference of write pointer and read pointer is less than a unit, then read pointer is set to wait state;
9, the translational speed of write pointer affects by encoder bit rate, and the speed of read pointer sends the impact of code check by TCP, if network state is better, then the speed of TCP transmission video data is faster, the speed reading video data is faster, just allow the more video data of encoder encodes, namely code check can be adjusted to larger, and frame per second can also tune up; On the contrary, network state is poorer, then drop probabilities is large, 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 greater than 0 and be similar to the size of whole buffer area, then the video data volume that in the representation unit time, TCP sends is less than the video data that coding produces, and should reduce encoder bit rate; If the difference of write pointer and read pointer is 0, and keep difference to be 0 in a period of time, then should raise encoder bit rate;
11, reduce encoder bit rate and raise two kinds of adjustable strategies that encoder bit rate is this self-adaption code rate adjustment algorithm, when the encoder bit rate of real-time video is greater than the transmission code rate of network, carry out the adjustment of reduction encoder bit rate, when Video Coding is less than Internet Transmission code check, carry out the encoder bit rate adjustment raised.In reality, in order to real-time video is stable as much as possible and level and smooth, reducing encoder bit rate is response fast, but rising encoder bit rate is slow response, needs to wait for that steadily certain period adjusts network just namely raise encoder bit rate;
Although 12 reduction encoder bit rates are quick responses, and to raise encoder bit rate be slow response, but two kinds of code adjustment strategies all need to carry out sampling statistics, namely added up by the sampling of the read-write pointer position difference of certain period, judge whether to carry out encoder bit rate adjustment response, and the sampling time raising encoder bit rate is longer than the sampling time of reducing encoder bit rate;
13, while taking encoder bit rate to adjust, in order to ensure real-time video quality, tackling frame per second mutually and also adjusting, reducing frame per second when code check reduces, when code check raises, increase frame per second;
embodiment six
Fig. 5 is the structured flowchart of the video frequency transmitter that the utility model embodiment provides, and this device can run in video monitoring equipment.For convenience of explanation, illustrate only part related to the present embodiment.
With reference to Fig. 5, this video frequency transmitter, comprising:
Net-work parameter information acquisition module 51, transmits the net-work parameter information of this video image for obtaining current network;
Video coding parameter searches module 52, and for searching video coding parameter corresponding to described net-work parameter information, wherein, described video coding parameter and network transmission quality correlation, comprise code check and frame per second;
Encoder bit rate adjusting module 53, for the data volume according to the real-time buffer memory of described video image, the encoder bit rate of adjustment in real time self;
Video packets of data generation module 54, for according to described encoder bit rate, encodes to described video image, generating video packet;
Video packets of data transport module 55, for transmitting described video packets of data.
In a kind of implementation of the present embodiment, in this video frequency transmitter, described video image cache module 51, specifically in unstable networks situation, sets up buffer area, by the video image that described buffer area buffer memory is current.
In a kind of implementation of the present embodiment, be the structured flowchart of encoder bit rate adjusting module 53 in the video frequency transmitter that provides of the utility model embodiment with reference to figure 6, Fig. 6, in this video frequency transmitter, described encoder bit rate adjusting module 53 comprises:
Encoder bit rate reduces unit 531, for when the described data volume according to the real-time buffer memory of described video image increases, reduces the encoder bit rate of self in real time, 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 buffer memory of described video image reduces, heightens the encoder bit rate of self in real time, until described data volume is close to preset data amount.
In a kind of implementation of the present embodiment, be the structured flowchart that in the video frequency transmitter that provides of the utility model embodiment, encoder bit rate reduces unit 531 with reference to figure 7, Fig. 7, in this video frequency transmitter, described encoder bit rate reduces unit 531 and comprises:
First obtains 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 greater than preset difference value in Preset Time;
Encoder bit rate reduces subelement 5313, for when whether difference described in Preset Time is greater than preset difference value, represents that the data volume of the real-time buffer memory of described video image increases, reduces the encoder bit rate of self in real time, until described data volume is close to preset data amount.
In a kind of implementation of the present embodiment, be the structured flowchart that in the video frequency transmitter that provides of the utility model embodiment, encoder bit rate heightens unit 532 with reference to figure 8, Fig. 8, in this video frequency transmitter, described encoder bit rate is heightened unit 532 and is comprised:
Second obtains 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, represent that the data volume of the real-time buffer memory of described video image reduces, heighten the encoder bit rate of self in real time, until described data volume is close to preset data amount.
The device that the utility model embodiment provides can be applied in the embodiment of the method for aforementioned correspondence, and details, see the description of above-described embodiment, do not repeat them here.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the utility model can add required common hardware by software and realizes.Described program can be stored in read/write memory medium, described storage medium, as random asccess memory, flash memory, read-only memory, programmable read only memory, electrically erasable programmable memory, register etc.This storage medium is positioned at memory, and processor reads the information in memory, performs the method described in each embodiment of the utility model in conjunction with its hardware.
The above; be only embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (5)
1. a video frequency transmitter, is characterized in that, comprising:
Net-work parameter information acquisition module, transmits the net-work parameter information of this video image for obtaining current network;
Video coding parameter searches module, and for searching video coding parameter corresponding to described net-work parameter information, wherein, described video coding parameter and network transmission quality correlation, comprise code check and frame per second;
Encoder bit rate adjusting module, for the data volume according to the real-time buffer memory of described video image, the encoder bit rate of adjustment in real time self;
Video packets of data generation module, for according to described encoder bit rate, encodes to described video image, generating video packet;
Video packets of data transport module, for transmitting described video packets of data.
2. device as claimed in claim 1, it is characterized in that, described net-work parameter information acquisition module, specifically in network link situation, sets up buffer area, by the video image that described buffer area buffer memory is current; And obtain the net-work parameter information of this video image of buffer memory.
3. device as claimed in claim 1, it is characterized in that, described encoder bit rate adjusting module, comprising:
Encoder bit rate reduces unit, for when the described data volume according to the real-time buffer memory of described video image increases, reduces the encoder bit rate of self in real time, until described data volume is close to preset data amount;
Encoder bit rate heightens unit, for when the described data volume according to the real-time buffer memory of described video image reduces, heightens the encoder bit rate of self in real time, until described data volume is close to preset data amount.
4. device as claimed in claim 3, is characterized in that, described encoder bit rate reduces unit, comprising:
First obtains subelement, for obtaining the difference between the real-time writing speed of described video image and reading speed;
First judgment sub-unit, for judging whether described difference is greater than preset difference value in Preset Time;
Encoder bit rate reduces subelement, for when whether difference described in Preset Time is greater than preset difference value, represents that the data volume of the real-time buffer memory of described video image increases, reduces the encoder bit rate of self in real time, until described data volume is close to preset data amount.
5. device as claimed in claim 3, it is characterized in that, described encoder bit rate heightens unit, comprising:
Second obtains subelement, for obtaining the difference between the real-time writing speed of described video image and reading speed;
Second judgment sub-unit, for judging whether described difference is not more than preset difference value in Preset Time;
Encoder bit rate heightens subelement, for when whether difference described in Preset Time is not more than preset difference value, represents that the data volume of the real-time buffer memory of described video image reduces, heightens the encoder bit rate of self in real time, until described data volume is close to preset data amount.
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| CN201520647693.3U CN204929081U (en) | 2015-08-26 | 2015-08-26 | Video transmission device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105744342A (en) * | 2016-01-28 | 2016-07-06 | 腾讯科技（深圳）有限公司 | Data transmission method and device for mobile terminal |
| CN107026856A (en) * | 2017-03-30 | 2017-08-08 | 上海七牛信息技术有限公司 | The optimization method and optimization system of a kind of network plug-flow quality |
| CN107295423A (en) * | 2016-04-05 | 2017-10-24 | 南京微特喜网络科技有限公司 | A kind of adaptive coding and transmission method live for mobile terminal video |
| CN108966022A (en) * | 2018-06-29 | 2018-12-07 | 广州市千钧网络科技有限公司 | A kind of live broadcasting method, device and terminal |
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2015
- 2015-08-26 CN CN201520647693.3U patent/CN204929081U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105744342A (en) * | 2016-01-28 | 2016-07-06 | 腾讯科技（深圳）有限公司 | Data transmission method and device for mobile terminal |
| WO2017129090A1 (en) * | 2016-01-28 | 2017-08-03 | 腾讯科技（深圳）有限公司 | Data transmission method and device for mobile terminal |
| US10728594B2 (en) | 2016-01-28 | 2020-07-28 | Tencent Technology (Shenzhen) Company Limited | Method and apparatus for transmitting data of mobile terminal |
| CN107295423A (en) * | 2016-04-05 | 2017-10-24 | 南京微特喜网络科技有限公司 | A kind of adaptive coding and transmission method live for mobile terminal video |
| CN107295423B (en) * | 2016-04-05 | 2020-11-10 | 南京微特喜网络科技有限公司 | Self-adaptive coding and transmission method for mobile terminal video live broadcast |
| CN107026856A (en) * | 2017-03-30 | 2017-08-08 | 上海七牛信息技术有限公司 | The optimization method and optimization system of a kind of network plug-flow quality |
| WO2018177165A1 (en) * | 2017-03-30 | 2018-10-04 | 上海七牛信息技术有限公司 | Method and system for optimizing quality network pushed stream |
| CN108966022A (en) * | 2018-06-29 | 2018-12-07 | 广州市千钧网络科技有限公司 | A kind of live broadcasting method, device and terminal |
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