CN101170685A - Network video transmission method - Google Patents
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- CN101170685A CN101170685A CN 200710178567 CN200710178567A CN101170685A CN 101170685 A CN101170685 A CN 101170685A CN 200710178567 CN200710178567 CN 200710178567 CN 200710178567 A CN200710178567 A CN 200710178567A CN 101170685 A CN101170685 A CN 101170685A
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Abstract
The invention provides a network video transmission method. The method reasonably divides the transmitted information into two parts including a fundamental layer and a reinforcement layer. The fundamental layer can meet the user's requirement of real-time monitoring by the user and the reinforcement layer can meet the user's requirement of high-quality view, wherein the fundamental layer can be independently decoded into video with initial quality, and the reinforcement layer is used in combination with the fundamental layer to improve the quality of the fundamental layer. When the user at the receiving terminal plays back the locally-stored video file, the monitoring terminal transmits the reinforcement layer information to the receiving terminal at the same time, cooperating with the high-quality video decoded from the fundamental layer information; and simultaneously the receiving terminal stores the reinforcement layer information as an auxiliary file and directly reads the reinforcement layer information from the auxiliary file during the next playback process, without needing the monitoring terminal to transmit information. The method can split the load of signal channel and ensure to provide high-quality video under the condition of low bandwidth.
Description
Technical field
The invention belongs to the communications field, relate to a kind of network video transmission method.
Background technology
Often can see at present video camera or the camera of realizing remote monitoring function on the market, these watch-dogs can make the user in time observe the situation in strange land with the form of video at receiving terminal.The implementation of these equipment is: monitoring client is communicated by letter by certain type network with receiving terminal, monitoring client is by a camera collection video data, by certain standard the image that receives is encoded, be sent to receiving terminal during then by network implementation, decode by same standard at receiving terminal, and play to the user.
The design that present this kind equipment is on the market mainly taked all has following characteristics:
1) monitoring software all need and be play on the real-time and make balance at video quality.The high code check of high-quality video information inevitable requirement transmission, and the characteristic of network causes becoming big in the delay of receiving terminal, especially in wireless network, channel circumstance is abominable, and the effective bandwidth resource is very limited.The transmission of the big data quantity video information of therefore unlimited channel faces huge challenge.And, in time grasp detailed information easily in order to make the user for a monitoring software, exploitation receiving terminal software is undoubtedly best mode on mobile device.
2) video encoding and decoding standard of Cai Yonging adopts MPEG-4 or H.264 more.MPEG-4 occurs relatively early, the technical merit comparative maturity, and also also many based on the product of this standard on the market.H.264 be the new standard that just occurred in recent years, the tenth part that belongs to the MPEG-4 standard, its compression ratio reaches as high as the twice of traditional MPEG-4, be fit to very much video information in storage on the mobile device and the transmission on the low bandwidth radio channel, but it has increased the scramble time, if under the situation that the CPU processing speed allows, H.264 standard is to be fit to very much remote monitoring software.
3) nearly all watch-dog all lacks flexibility, and high-quality video must mean high code check, if the user wishes to grasp the detailed information of image then software just needs the channel of high bandwidth.We wish to find a kind of monitoring strategies, can make video information to transmit on low bandwidth channel, can obtain corresponding detailed information according to user's needs again, make the monitoring software can be with the receiving terminal of mobile device as it.
Japan NTT CyberSpace research institute has developed a kind of software codec based on the hierarchical coding algorithm, and the strategy that this codec is taked is: only send basic layer when normal transmission 1.; 2. if find in the process of transmitting of basic layer that channel has remaining bandwidth, then selects enhancement layer to send to receiving terminal.Though this strategy can the adaptively modifying transmission code rate, correspondingly changes the video reception quality, also has following defective: 1. work as bad channel quality, when not having enough bandwidth, coding side can send enhanced layer information hardly.This moment, this strategy can not provide high-quality video for receiving terminal.2. the serviceability of enhancement-layer video is not high.When channel has remaining bandwidth, all be channel when code check is lower generally, learn that according to the encoding and decoding principle image content changes the less low code check that just can cause, all less near static picture hot information, the quality purposes that improves video this moment is obviously little.
Summary of the invention
The present invention proposes a kind of network video transmission method, only transmitting basic layer bit stream in the hierarchical coding when monitoring in real time provides the video information of run-of-the-mill, when carrying out playback, monitoring client transmits enhanced layer information, cooperates the basic layer information decoding that before had been stored in receiving terminal to go out high-quality video and carries out the high definition processing.Satisfying under the prerequisite that the user monitors demand in real time, utilize the thought of hierarchical coding, at utmost reduce the code check of transmission, also can provide high-quality video simultaneously according to user's needs, reduce the volume of transmitted data on the network in the unit interval, satisfied the demand of low bandwidth radio channel.
A kind of network video transmission method has been taked the transmission means of hierarchical coding, comprises the steps:
Step 1: mobile devices such as mobile phone, PDA are used as the request that receiving terminal sends remote monitoring, and receiving terminal and monitoring client connect;
Step 2: monitoring client is that the video information that collects is carried out hierarchical coding, is divided into a basic layer and an enhancement layer, and basic layer information is sent to receiving terminal, simultaneously enhanced layer information is stored into monitoring client this locality; Basic layer information is play in the receiving terminal decoding, and stores video file into receiving terminal this locality, finishes until video monitoring;
Step 3: during user's playback video, as the viewing files first time, receiving terminal will connect with monitoring client once more, receiving terminal receives the enhanced layer information that before had been stored in monitoring client, and preserve into secondary file, and this enhanced layer information was become high-quality video playback in conjunction with before being stored in local basic layer file together decode.As not being the viewing files first time, receiving terminal directly reads the local secondary file that has stored and obtains enhanced layer information, and the basic layer of an associating file together decode goes out high-quality video file broadcast, finishes until video playback.
Secondary file comprises file header and document body content two parts in the described step 3, the document body content is preserved the enhanced layer information of all frames in proper order, and file header comprises id number and the location index of enhancement layer in the document body content of corresponding frame of video of each frame of video.
Not for the first time during playback video in the described step 3, according to the current basic floor information of secondary file id number, in the receiving terminal displaying video process by the header that reads described secondary file just can obtain the location index of corresponding enhanced layer information in the secondary file body matter, according to this index receiving terminal just can obtain fast this enhanced layer information and with basic layer information combined decoding.
For the first time during playback video, when receiving terminal is preserved enhanced layer information in secondary file, the information that needs are preserved be write the document body of secondary file, simultaneously the id number and the location index of this enhanced layer information of interpolation in file header in the described step 3.
The advantage of a kind of network video transmission method of the present invention is:
(1) receiving terminal of a kind of network video transmission method of the present invention is a wireless mobile apparatus, can make the user obtain the video information of monitoring client whenever and wherever possible, and needn't need the support of PC.
(2) a kind of network video transmission method of the present invention only transmits basic layer information when monitoring in real time, in user's playback video file, transmit enhanced layer information, played the effect of shunting channel loading, guaranteeing still can provide high-quality video under the situation of low bandwidth.
Description of drawings
Fig. 1 is the network architecture diagram of a kind of network video transmission method of the present invention;
Fig. 2 is the flow chart of a kind of network video transmission method of the present invention;
Fig. 3 is the structured flowchart of the secondary file of a kind of network video transmission method of the present invention;
Fig. 4 is signal to noise ratio PSNR value broken line graphs a kind of network video transmission method of the present invention and the video informations different code checks of conventional method.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The present invention proposes a kind of network video transmission method, this method has adopted improved hierarchical coding technology, the information of will transmitting reasonably is divided into basic layer and enhancement layer two parts, basic layer can satisfy user's needs of monitoring in real time, enhancement layer can satisfy the needs that user's high-quality is watched, and wherein basic layer can independently be decoded into the video of gross, and enhancement layer uses in conjunction with basic layer, can improve the quality of basic layer, and the redundant content of the two is very little.In normal transmission, only need to transmit basic layer, when playback, monitoring client begins partly to provide for corresponding focus the coding of enhanced layer information.When receiving terminal user playback was stored in local video file, monitoring client cooperated basic layer information decoding to go out high-quality video simultaneously to receiving terminal transmission enhanced layer information; Receiving terminal is stored as enhanced layer information a secondary file simultaneously, will directly read the enhanced layer information in the secondary file in the replayed section afterwards, and no longer needs monitoring client transmission information.Played the effect of shunting channel loading like this, guaranteeing still can provide high-quality video under the situation of low bandwidth.
The present invention takes the operational environment of strategy to be set as follows:
1) monitoring client all wants to be connected to cable network (having wireless network card is connected by AP) with receiving device.
2) monitoring client will have enough space storage enhancement layer coding information.
3) receiving terminal will have enough space storage basic layer files and secondary file.
As shown in Figure 1, the remote supervisory and control(ling) equipment of the present invention design is made up of remote monitoring end, mobile device receiving terminal and the wireless aps that covers mobile device.Wherein the remote monitoring end has a camera, and it can be the PC equipment that is connected on the Internet, also can be an embedded device that has wireless network card, and the latter need be connected into cable network by wireless aps; The mobile device receiving terminal is the mobile phone or the PDA of a built-in wireless network card, is connected to Internet and the remote monitoring end communicates by wireless aps.
Monitoring client and receiving device will successively connect for twice, being respectively real-time connection is connected with playback, equipment is connected to the Internet cable network by wireless network card and communicates, and monitoring client will use channel that the video of gross is provided as receiving terminal constantly when connecting in real time; Playback connects when occurring in user's playback store video, and monitoring client will transmit enhancement-layer video information to receiving terminal this moment.
In order to test the performance of this tactful system of employing, in the present embodiment, adopt PC as monitoring client, PC need connect a camera and gather video information; The N95 that uses NOKIA is as receiving terminal, the built-in wireless network card of N95, and the two communicates by the wi-fi channel.Simulated environment is set as follows:
PC is connected to Internet by cable network;
Another main frame connects the interface of AP as cable network and wireless network;
N95 is connected to by its wi-fi module and covers wireless aps, and then communicates with monitoring client
The video acquisition frame sign is CIF pattern (352 * 288);
As shown in Figure 2, the detailed operation step of present embodiment is as follows:
Step 1: user mobile phone sends the request of remote monitoring as receiving terminal, and receiving terminal is set up with monitoring client and is connected in real time, begins to receive the video data of monitoring client.The transmission of employing udp protocol, error control is responsible for by high-rise Real-time Transport Protocol.
Step 2: monitoring client begins to gather video information and with standard H.264 video image is compressed after connecting, improved hierarchical coding thought has been adopted in the compression of video, monitoring client becomes a basic layer and the enhancement layer with high video quality that gross is provided with encoding video pictures, the specific coding process is: select bigger quantization step as parameter video image to be quantized, obtain the video of run-of-the-mill, utilizing H.264 then, encoder obtains basic layer information with its coding; Select less quantization parameter that image quantization is obtained high-quality video then, subtract each other with the video of run-of-the-mill and obtain residual information, utilize H.264 encoder its coding layer information that is enhanced.This shows that basic layer can independently be decoded into the video of gross, enhancement layer can not independently use, and it uses in conjunction with basic layer, can improve the quality of basic layer; H.264 stipulating the frame number field in the header file in the standard in addition, this field record the position number id that in whole video stream, occurs of this frame, because the two all is to utilize H.264 encoder to encode, and the basic layer of all video images puts in order consistent with the coding in the enhancement layer, then the enhanced layer information of each frame all is labeled same id number with basic layer information, and decoder can be linked to each other by this id number basic floor information and the enhanced layer information with same frame.
Basic layer coded message is being transferred to receiving terminal in the monitoring in real time, and the enhancement layer coding information storage is provided with the back and uses to monitoring client this locality simultaneously, and receiving terminal utilizes H.264 basic layer information decoding and the broadcast that will receive of decoder of standard, finishes until video monitoring.
Step 3: during the user's playback video first time, receiving terminal will connect with monitoring client once more by wi-fi, and monitoring client sends since the enhancement layer of first two field picture, to the last a frame.When monitoring client sends the enhanced layer information of a two field picture behind receiving terminal by the wi-fi channel, receiving terminal stores this enhanced layer information in the local cache of receiving terminal, when video file is play a certain frame, can from the receiving terminal local cache, travel through by the id number of this frame of video and find out corresponding enhanced layer information, in conjunction with previous storage basic layer information hereof, substantially layer information and enhanced layer information are passed through H.264 decoder decode respectively, to obtain the video image of run-of-the-mill behind the basic layer information decoding, the enhanced layer information decoding will obtain the residual information of high-quality video image and run-of-the-mill video image, two information additions just can access high-quality video image, carry out combined decoding and broadcast by the way, enhanced layer information is kept in the secondary file simultaneously, finishes until video playback.
As shown in Figure 3, this secondary file comprises file header and document body content, the document body content is preserved the enhanced layer information of all frame of video in proper order, and file header comprises id number and the location index of enhancement layer in the document body content of corresponding frame of video of each frame of video.During broadcast according to current basic floor information id number, by the header that reads secondary file just can obtain the location index of corresponding enhanced layer information in the document body content of secondary file, just can obtain this enhanced layer information fast according to this index, when in secondary file, preserving enhanced layer information, to write document body to the information that needs are preserved, in file header, add the id number and the location index of this enhanced layer information simultaneously.
As the user is not the playback video first time, receiving terminal will no longer connect monitoring client, but the secondary file of opening and directly read receiving terminal this locality obtains enhanced layer information, concrete mode is: according to the basic floor information of current broadcast frame id number, by the header that reads secondary file obtain the location index of corresponding enhanced layer information in the secondary file body matter, just can obtain this enhanced layer information fast according to this index.The basic layer information combined decoding of this enhanced layer information and storage, decoding process is: layer information and enhanced layer information are passed through H.264 decoder decode substantially respectively, to obtain the video image of run-of-the-mill behind the basic layer information decoding, the enhanced layer information decoding will obtain the residual information of high-quality video image and run-of-the-mill video image, two information additions just can access high-quality video image, finish until video playback.
As shown in Figure 4, in the present embodiment, under the situation of different code checks, make a contrast in the signal to noise ratio PSNR value of the video information that adopts under the conventional method situation and take to provide under this method situation respectively.The code check of maximum restriction when the x axle is transmission, y axle are the signal to noise ratio PSNR value that receiving terminal obtains video under the restriction of phase code rate.As seen in Figure 4 owing to adopted the method for transmission stage by stage, the transmission of second stage can remedy the deficiency of phase I video quality, be transmitted in by two stages under the prerequisite of control channel code check and optimized final video quality, though the method can cause certain coding redundancy, but video quality is significantly risen, and the video quality rising is obvious more under the more little situation of code check, and this exactly is fit to the relatively poor wireless channel transmission of channel quality.
In theory, the basic layer of taking in this method and the phase transmission methods of enhancement layer can reach the code check that quite doubles commonsense method, but consider that also there is a certain proportion of redundancy in hierarchical coding, the code check that phase transmission methods can reach can be lower than two times normal transmission method, as can see from Figure 4, the PSNR value that 300kbps code check next stage transmission method reaches also a little less than the PSNR value of normal transmission method under the 600kbps code check, also meets this rule under 350kbps and the 700kbps situation.
Claims (4)
1. a network video transmission method is characterized in that, comprises the steps:
Step 1: mobile devices such as mobile phone, PDA are used as the request that receiving terminal sends remote monitoring, and receiving terminal and monitoring client connect;
Step 2: monitoring client is that the video information that collects is carried out hierarchical coding, is divided into a basic layer and an enhancement layer, and basic layer information is sent to receiving terminal, simultaneously enhanced layer information is stored into monitoring client this locality; Basic layer information is play in the receiving terminal decoding, and stores video file into receiving terminal this locality, finishes until video monitoring;
Step 3: during user's playback video, as the viewing files first time, receiving terminal will connect with monitoring client once more, receiving terminal receives the enhanced layer information that before had been stored in monitoring client, and preserve into secondary file, and this enhanced layer information was become high-quality video playback in conjunction with before being stored in local basic layer file together decode; As not being the viewing files first time, receiving terminal directly reads the local secondary file that has stored and obtains enhanced layer information, and the basic layer of an associating file together decode goes out high-quality video file broadcast, finishes until video playback.
2. according to the described a kind of network video transmission method of claim 1, it is characterized in that: secondary file comprises file header and document body content two parts in the described step 3, the document body content is preserved the enhanced layer information of all frames in proper order, and file header comprises id number and the location index of enhancement layer in the document body content of corresponding frame of video of each frame of video.
3. according to claim 1 or 2 described a kind of network video transmission methods, it is characterized in that: be not for the first time during playback video in the described step 3, according to the current basic floor information of secondary file id number, in the receiving terminal displaying video process by the header that reads described secondary file just can obtain the location index of corresponding enhanced layer information in the secondary file body matter, according to this index receiving terminal just can obtain fast this enhanced layer information and with basic layer information combined decoding.
4. according to claim 1 or 2 described a kind of network video transmission methods, it is characterized in that: in the described step 3 for the first time during playback video, when receiving terminal is preserved enhanced layer information in secondary file, to write the information that needs are preserved the document body of secondary file, in file header, add the id number and the location index of this enhanced layer information simultaneously.
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| CN 200710178567 CN101170685B (en) | 2007-11-30 | 2007-11-30 | Network video transmission method |
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| CN102065281A (en) * | 2010-11-23 | 2011-05-18 | 无锡港湾网络科技有限公司 | Network monitoring system with functions of storing and remote replaying |
| CN102405641A (en) * | 2009-02-03 | 2012-04-04 | 韩国电子通信研究院 | Transmission method, transmission apparatus, receiving method, and receiving apparatus for a digital multimedia broadcast service |
| CN102547266A (en) * | 2010-12-29 | 2012-07-04 | ***通信集团公司 | Video data transmission method and equipment |
| CN102625193A (en) * | 2011-01-27 | 2012-08-01 | 郑州威科姆科技股份有限公司 | A method of realizing multimedia file network playing by virtue of auxiliary files |
| CN101895740B (en) * | 2009-05-22 | 2012-08-08 | 华为技术有限公司 | Method and device for transmitting video data |
| CN103634552A (en) * | 2012-08-28 | 2014-03-12 | 华为技术有限公司 | Monitoring video storage method, system and central management server |
| CN104853226A (en) * | 2014-02-17 | 2015-08-19 | 华为技术有限公司 | Method, device, equipment and system for processing multimedia data |
| CN105049862A (en) * | 2014-04-25 | 2015-11-11 | 统一有限责任两合公司 | Method and device for transmission of encoded media data |
| CN106303566A (en) * | 2016-08-16 | 2017-01-04 | 广东中星电子有限公司 | Based on the method for processing video frequency subscribed to and device |
| CN110099250A (en) * | 2019-04-18 | 2019-08-06 | 浙江工业大学 | A kind of monitor video Quality estimation method and broadcast control device |
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| CN1509081A (en) * | 2002-12-20 | 2004-06-30 | �ʼҷ����ֵ��ӹɷ�����˾ | Method and system for transfering double-layer HDTV signal throught broadcast and network flow |
| US20060133247A1 (en) * | 2003-06-19 | 2006-06-22 | Koninklijke Philips Electronics N.V. | Apparatus for processing information stored in a data carrier, data carrier and method for storing a file with a plurality of related sub-files in said carrier |
| KR100866482B1 (en) * | 2004-01-29 | 2008-11-03 | 삼성전자주식회사 | Monitoring system and method for using the same |
| CN101015191A (en) * | 2004-07-09 | 2007-08-08 | 高通股份有限公司 | System for layering content for scheduled delivery in a data network |
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| CN101895740B (en) * | 2009-05-22 | 2012-08-08 | 华为技术有限公司 | Method and device for transmitting video data |
| CN102065281A (en) * | 2010-11-23 | 2011-05-18 | 无锡港湾网络科技有限公司 | Network monitoring system with functions of storing and remote replaying |
| CN102065281B (en) * | 2010-11-23 | 2015-01-07 | 无锡港湾网络科技有限公司 | Network monitoring system with functions of storing and remote replaying |
| CN102547266A (en) * | 2010-12-29 | 2012-07-04 | ***通信集团公司 | Video data transmission method and equipment |
| CN102625193B (en) * | 2011-01-27 | 2014-07-09 | 郑州威科姆科技股份有限公司 | A method of realizing multimedia file network playing by virtue of auxiliary files |
| CN102625193A (en) * | 2011-01-27 | 2012-08-01 | 郑州威科姆科技股份有限公司 | A method of realizing multimedia file network playing by virtue of auxiliary files |
| CN103634552A (en) * | 2012-08-28 | 2014-03-12 | 华为技术有限公司 | Monitoring video storage method, system and central management server |
| CN104853226A (en) * | 2014-02-17 | 2015-08-19 | 华为技术有限公司 | Method, device, equipment and system for processing multimedia data |
| CN105049862A (en) * | 2014-04-25 | 2015-11-11 | 统一有限责任两合公司 | Method and device for transmission of encoded media data |
| US10516714B2 (en) | 2014-04-25 | 2019-12-24 | Unify Gmbh & Co. Kg | Method and apparatus for transmitting encoded media data |
| CN106303566A (en) * | 2016-08-16 | 2017-01-04 | 广东中星电子有限公司 | Based on the method for processing video frequency subscribed to and device |
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| CN110099250B (en) * | 2019-04-18 | 2021-02-02 | 浙江工业大学 | Monitoring video quality judgment method and play control device |
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