CN102572409A - Method for preventing video interruption in sector switching process of mobile video monitoring - Google Patents
Method for preventing video interruption in sector switching process of mobile video monitoring Download PDFInfo
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- CN102572409A CN102572409A CN2011104275705A CN201110427570A CN102572409A CN 102572409 A CN102572409 A CN 102572409A CN 2011104275705 A CN2011104275705 A CN 2011104275705A CN 201110427570 A CN201110427570 A CN 201110427570A CN 102572409 A CN102572409 A CN 102572409A
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Abstract
The invention discloses a method for preventing video interruption in a sector switching process of mobile video monitoring. The method is characterized by comprising the following steps that: 1, after being started, a video monitoring front-end sets a first buffer zone for each connected client, automatically decreases the rate of a coded stream to be 40 to 60 percent of an original rate in a network interruption interval, and stores data which cannot be transmitted into a first buffer zone; 2, a user terminal automatically or manually sets a second buffer zone matched with the video monitoring front-end, and stores standby video data into the buffer zone in a normal monitoring process; 3, when the video monitoring front-end or the user terminal spans the coverage of a base station, the user terminal calls the standby video data in the second buffer zone for decoding and display; and 4, a network signal is recovered, the user terminal initiates a retransmission command to the video monitoring front-end, the video monitoring front-end transmits the data stored in the first buffer zone to the user terminal, and the user terminal interrupts the decoding and display of the standby video data, and plays the data from the first buffer zone at a rate which is twice or more times the original play rate.
Description
Technical field
The present invention relates to the mobile video monitor field, particularly a kind of method that prevents sector handoff procedure video breaks.
Background technology
Wireless video monitoring system can be divided into three major types at present: based on WLAN (WiFi), based on wireless MAN (WiMAX) with based on mobile communications network.In addition to also adopting the wireless data transmission network of low side in the not high application of audio frequency and video quality requirement.Advantage based on the product of CDMA or GPRS is that mobility is fine, power consumption is relatively low, but shortcoming is very big to mobile network's interdependence, and can produce certain communication cost.And can higher bandwidth and the higher video image of quality be provided for the user based on the product of WiFi and WiMAX.
With reference to Fig. 1, be system construction drawing based on wireless MAN.System adopts network video server, camera, The Cloud Terrace decoder, warning input-output apparatus to form video monitoring front-end.After the video information of the intact control point of video monitoring front-end collection; Be treated to radiofrequency signal through WiMAX CPE and mail to the base station again; Be transferred to the unified supervision of local video Surveillance center, management by the base station through Ethernet then, Surveillance center passes to final terminal use through wireless network with monitored picture again.The front end wireless video monitoring equipment of video monitoring front-end can be placed on the mobile devices such as automobile, steamer; In the process that moves, obtain monitoring image in real time; And the Security Personnel is equipped with hand-held monitoring terminal and just can when moving patrol, monitors each by the situation of monitor area, the safety of guarantee control point.
Because the particularity of wireless communication, when monitored target (for example ship) shuttled in the different base station coverage, in the place of crossing over the base station, interim, of short duration disruption can appear in network signal, in WiMAX communication, was referred to as the sector and switched.And in field of video monitoring; Interrupting can not appear in the transmission of live video stream; Otherwise certainly will cause frame losing; And the relativity of video flowing coding requires the dependence of decoding between the frame of front and back in case frame losing will make all videos between 2 key frames decode, to cause video quality to descend than higher.
Summary of the invention
The object of the invention proposes to be applied to the method that mobile video monitor prevents sector handoff procedure video breaks to above-mentioned existing issue.
The present invention realizes through following scheme:
A kind ofly be applied to the method that mobile video monitor prevents sector handoff procedure video breaks, it is characterized in that, comprise step:
Automatically for the client of each connection is provided with first buffering area, and in the interval that network is interrupted, the data that can't send were saved in buffering area after step 1, video monitoring front-end started, and automatic encoding code stream speed were reduced to original 40%～60%;
Step 2, user terminal automatically or second buffering area that is complementary of means setting and video monitoring front-end, normally in the monitor procedure, user terminal with the alternate video storage at this buffering area;
Step 3, when video monitoring front-end or user terminal leap base station coverage area, network signal can occur in the interim interrupt procedure, and the alternate video data that user terminal calls in second buffering area are carried out decoding and displaying;
Step 4; Network signal recovers; User terminal initiates to retransmit order to video monitoring front-end; The data that video monitoring front-end will be stored in first buffering area are sent to user terminal, the decoding and displaying of user terminal interrupts alternate video data, and will play with 2 times of original playback rate or above speed from the data of first buffering area.
As optimization, said step 1, video monitoring front-end is reduced to original 50% with encoding code stream speed automatically more to be helped implementing and the user side compatibility; The storable video length of described first buffering area and second buffering area is that the data of 120%～200%, first buffering area of network break period are play with 2 times of speed of original playback rate and can effectively be controlled time delay.
Description of drawings
Fig. 1 is existing wireless MAN mobile video monitor system structure chart;
Fig. 2 is that sketch map is switched in the sector;
Fig. 3 is the core process figure of inventive method.
Embodiment
With reference to figure 1, all there is a coverage wireless base station.In the wireless video monitoring process, when video monitoring front-end or user terminal get into another wireless base station coverage by a wireless base station coverage, between two wireless networks switch, can cause the interim disruption of network.Because this network interrupts temporarily, the video data real-time Transmission between video monitoring front-end and the user terminal also will be interrupted.Traditional method is that the video of the user terminal displays in break period also will interrupt because of decoding.
With reference to figure 3, in the implementation procedure of the inventive method, basic procedure is following:
Second buffering area that step 103, user terminal setting and video monitoring front-end are complementary.The means of setting comprise the user according to Client-Prompt, the means setting; Client is provided with automatically.Video monitoring front-end will be sent to the client of user terminal for the first buffer pool size size information of user terminal setting, and user terminal is provided with second buffering area automatically according to this information.The storable video length of second buffering area is 120%～200% of network break period.
Set up normal network between the step 104, video monitoring front-end and user terminal and be connected, and carry out normal monitor video transmission and play.The client of user terminal through dynamic adjusting broadcasting speed, forms subsequent use video data in normal video playback.Subsequent use video data length should more than or equal to two wireless base stations in switch the terminal time cause.
Whether step 106, user terminal detect network and interrupt, if proper network connects, then carry out the transmission and the broadcast of normal monitor video, otherwise user terminal and video monitoring front-end are with carrying out step 108 and 107 respectively.
Whether step 110 detects between video monitoring front-end and the user terminal network and is connected and recovers normally if also be in interrupt procedure, then to forward step 107 and 108 respectively to, otherwise, forward step 111 to.
Claims (4)
1. one kind is applied to the method that mobile video monitor prevents sector handoff procedure video breaks, it is characterized in that, comprises step:
Step 1; After starting, video monitoring front-end for the client of each connection first buffering area is set automatically; And in the interval that network is interrupted, automatically encoding code stream speed is reduced to originally 40%～60%, and the data that can't send are saved in first buffering area;
Step 2, user terminal automatically or second buffering area that is complementary of means setting and video monitoring front-end, normally in the monitor procedure, user terminal with the alternate video storage at this buffering area;
Step 3, when video monitoring front-end or user terminal leap base station coverage area, network signal can occur in the interim interrupt procedure, and the alternate video data that user terminal calls in second buffering area are carried out decoding and displaying;
Step 4; Network signal recovers; User terminal initiates to retransmit order to video monitoring front-end; The data that video monitoring front-end will be stored in first buffering area are sent to user terminal, the decoding and displaying of user terminal interrupts alternate video data, and will play with 2 times of original playback rate or above speed from the data of first buffering area.
2. as claimed in claim 1ly be applied to the method that mobile video monitor prevents sector handoff procedure video breaks, it is characterized in that, said step 1, video monitoring front-end is reduced to original 50% with encoding code stream speed automatically.
3. as claimed in claim 2ly be applied to the method that mobile video monitor prevents sector handoff procedure video breaks; It is characterized in that; Also comprise step 5; Video monitoring front-end will be sent to user terminal for the first buffer pool size size information of user terminal setting, and user terminal is provided with second buffering area automatically according to this information.
4. like the arbitrary described method that mobile video monitor prevents sector handoff procedure video breaks that is applied to of claim 1 to 3; It is characterized in that the storable video length of described first buffering area and second buffering area is 120%～200% of network break period.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104275705A CN102572409A (en) | 2011-12-19 | 2011-12-19 | Method for preventing video interruption in sector switching process of mobile video monitoring |
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| CN2011104275705A CN102572409A (en) | 2011-12-19 | 2011-12-19 | Method for preventing video interruption in sector switching process of mobile video monitoring |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015168973A1 (en) * | 2014-05-06 | 2015-11-12 | 中兴通讯股份有限公司 | Method and device for wireless video processing, media server, monitoring terminal and system |
| CN105072014A (en) * | 2015-08-28 | 2015-11-18 | 浙江大华技术股份有限公司 | Multimedia data transmission method, vehicle-mounted device and monitoring server |
| CN106341698A (en) * | 2015-07-07 | 2017-01-18 | 腾讯科技（深圳）有限公司 | Video live broadcast processing method and device |
| CN107306359A (en) * | 2016-04-18 | 2017-10-31 | 零度智控（北京）智能科技有限公司 | A kind of UAV Video playing device and method |
| CN108370281A (en) * | 2015-12-02 | 2018-08-03 | 瑞典爱立信有限公司 | The data rate adaptation of the multicast of stream content |
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| CN108370281B (en) * | 2015-12-02 | 2021-09-03 | 瑞典爱立信有限公司 | Data rate adaptation for multicast delivery of streaming content |
| CN107306359A (en) * | 2016-04-18 | 2017-10-31 | 零度智控（北京）智能科技有限公司 | A kind of UAV Video playing device and method |
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Application publication date: 20120711 |