CN101516017B - Method, device and system for measuring video transmission delay of session service - Google Patents
Method, device and system for measuring video transmission delay of session service Download PDFInfo
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- CN101516017B CN101516017B CN200810100826XA CN200810100826A CN101516017B CN 101516017 B CN101516017 B CN 101516017B CN 200810100826X A CN200810100826X A CN 200810100826XA CN 200810100826 A CN200810100826 A CN 200810100826A CN 101516017 B CN101516017 B CN 101516017B
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Abstract
The invention relates to the field of communication, in particular to technology for measuring video transmission delay of session service. A device for measuring the video transmission delay of the session service comprises a sending module of the measuring device, a receiving module of the measuring device and a determining module, wherein the sending module of the measuring device is used for sending video data which add a test identifier in a video frame to a video service platform, and recording the time for sending the video frame with the test identifier; the receiving module of the measuring device is used for receiving the video data which are processed by the video service platform, and recording the receiving time of the video frame when receiving the video frame with the test identifier; and the determining module is used for determining the video transmission delay according to the recorded sending time and receiving time. The invention also provides a method for measuring the video transmission delay of the session service. Because the device and the method add the test identifier in the video frame, detect the time taken by the video frame from the sending end to the receiving end after the processing of the video service platform, and the measuring accuracy of the video transmission delay is improved.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of video transmission delay technology of measuring session service.
Background technology
Along with the construction and the application of various broadband networks, develop rapidly based on the session service of video, for example video conference, video telephone, video message, video such as share at session service.
The video class data generally adopt the mode of Streaming Media (Stream) to carry out transfer of data, follow RTP (Real-time Transport Protocol, RTP), RTSP agreements such as (Real-Time StreamingProtocol, real-time streaming protocols).With other data services, as note, multimedia message, WAP (WirelessApplication Protocol, WAP (wireless application protocol)) differences such as visit, Pushemail push mail, multimedia service particularly video class business is very high to the requirement of real-time, the time delay of data flow will directly have influence on the evaluation of user to this business, so video transmission delay also is an important indicator of weighing based on the session service of video.
The definition of video transmission delay as shown in Figure 1, user A gathers video data by video source (as camera), send to the video class business platform behind the coding, Business Processing is carried out to video data in video class business platform decoding back, as carry out the various visual angles stack for video conference, and then the processed video data are carried out encoding compression, export to user B.Video data sends from user A (transmitting terminal), and the time that receives to user B (receiving terminal) is video transmission delay, comprising the video class business platform time delay of managing business.
In the prior art, general transmission time and the video class business platform of tentation data from user A to the video class business platform is equal substantially to the transmission time of user B, adopt video transmission delay of session service measuring system as shown in Figure 2 to measure propagation delay time, test philosophy is: test instrumentation sends video data to the video class business platform, and the time t1 of recording start transmission; The video class business platform returns ACK message to test instrumentation when receiving the RTP bag of video data; Test instrumentation writes down the time t2 that receives response when receiving first ACK, test instrumentation deducts calculated value that t1 obtains as video transmission delay with t2.
Test instrumentation is that time t2 with first ACK of receiving the video class business platform deducts the time t1 that begins to send as video transmission delay in the prior art, but, the video class business platform sends ACK and does not mean that the video class business platform handles the video data that receives, this signal is that the video class business platform receives that the RTP of video data sends when wrapping, be not to send after the video class business platform is handled video data RTP bag, so the video transmission delay that adopts the method for measurement of prior art to measure does not comprise the processing time of video class business platform to video data, thereby can't obtain video transmission delay comparatively accurately.
Summary of the invention
The embodiment of the invention provides a kind of method of measurement, device and system of video transmission delay of session service, in order to improve the accuracy of measuring video transmission delay of session service.
A kind of video transmission delay measurement mechanism of video session class business comprises:
The measurement mechanism sending module, the video data that is used for having added the test sign in a plurality of frame of video sends to the video class business platform, and record sends the time of each frame of video that the test sign is arranged, test sign in each frame of video includes the sending order information of this frame of video, and the frame of video transmitting time of record and the corresponding relation of the sending order information in this frame of video test sign are saved in the corresponding relation memory module;
The measurement mechanism receiver module, be used to receive described video data through after the described video class business platform Business Processing, and when receiving the frame of video of test sign, write down the time of reception of this frame of video, and from the test sign of this frame of video, extract sending order information;
Determination module, be used for corresponding relation that the sending order information extracted according to described measurement mechanism receiver module and described corresponding relation memory module preserve and determine the transmitting time of this frame of video, the time delay of video transmission when the time of reception of this frame of video that obtains according to the transmitting time of the frame of video that the test sign is arranged and from described measurement mechanism receiver module is determined to send this frame of video; Propagation delay time according to each frame of video of determining is determined video transmission delay.
Further, described measurement mechanism also comprises:
Pretreatment module is used for adding the test sign in the frame of video of video data, and the video data that has added the test sign is sent to described measurement mechanism sending module.
A kind of method of measurement of video transmission delay of session service comprises:
The video data that has added the test sign in a plurality of frame of video is sent to the video class business platform, and write down the time that sends each frame of video that the test sign is arranged, the test sign in each frame of video includes the sending order information of this frame of video;
Preserve the corresponding relation of the sending order information in frame of video transmitting time and this frame of video test sign;
Receive the described video data of handling through described video class business platform, and when receiving the frame of video of test sign, write down the time of reception of this frame of video, and from the test sign of this frame of video, extract sending order information, determine the transmitting time of this frame of video according to described corresponding relation;
The time delay of video transmission when determining to send this frame of video according to the time of reception of the transmitting time of the frame of video that test sign is arranged and this frame of video; Propagation delay time according to each frame of video of determining is determined video transmission delay.
Further, described the video data that has added the test sign in a plurality of frame of video is sent to the video class business platform before, also comprise: in the frame of video of video data, add the test sign.
A kind of measuring system of video transmission delay of session service comprises:
First measurement mechanism and second measurement mechanism;
Described first measurement mechanism and second measurement mechanism are sent in the video data that has added the test sign in a plurality of frame of video by the video class business platform respectively, and recording the transmitting time of testing each frame of video that identifies respectively, the test sign in each frame of video includes the sending order information of this frame of video;
Described first measurement mechanism and second measurement mechanism are preserved the corresponding relation of the sending order information in frame of video transmitting time and this frame of video test sign respectively;
Described first measurement mechanism and second measurement mechanism receive respectively through described video class business platform and handle the video data that the back sends, and when receiving the frame of video of test sign, record the time of reception of the frame of video of test sign respectively, and from the test sign of frame of video, extract sending order information respectively, define the transmitting time of the frame of video of test sign according to the corresponding relation of preserving separately;
Described first measurement mechanism and second measurement mechanism are respectively according to the transmitting time of the frame of video of determining separately that the test sign is arranged and the time of reception that the frame of video of test sign is arranged, definite transmission has the time delay of video transmission when testing the frame of video that identifies, respectively according to the definite video transmission delay separately of the propagation delay time of each frame of video of determining.
The embodiment of the invention is by adding the test sign in frame of video, and handle back arrival receiving terminal used transmission time from transmitting terminal through the video class business platform according to test label detection frame of video and determine video transmission delay, comprised the processing time of video class business platform thereby make to measure in the video transmission delay, therefore improved the accuracy of measuring video transmission delay video data.
Further, the embodiment of the invention has also been added the sending order information of frame of video in the test sign, make video data in process with the transmission of Streaming Media form, can measure the video transmission delay of each frame of video in a plurality of frame of video, obtain the situation of change of propagation delay time in the whole video transmission course.
Description of drawings
Fig. 1 is the Video transmission system schematic diagram of the session service of prior art;
Fig. 2 is the measuring system schematic diagram of the video transmission delay of session service of prior art;
Fig. 3 is the measurement mechanism structure chart of the video transmission delay of session service of the embodiment of the invention one;
Fig. 4 is the method for measurement flow chart of the video transmission delay of session service of the embodiment of the invention one;
Fig. 5 is the measurement mechanism structure chart of the video transmission delay of session service of the embodiment of the invention two;
Fig. 6 is the method for measurement flow chart of the video transmission delay of session service of the embodiment of the invention two;
Fig. 7 a is the video transmission delay of session service measuring system schematic diagram of the embodiment of the invention three;
Fig. 7 b is the video transmission delay of session service method of measurement flow chart of the embodiment of the invention three.
Embodiment
The embodiment of the invention is by adding the test sign in the frame of video of video data, and handle receiving terminal used time that back arrive testing apparatus from the transmitting terminal of testing apparatus through the video class business platform according to frame of video and determine video transmission delay with test sign, make in the video transmission delay of measurement to have comprised the processing time of video class business platform, thereby improved the accuracy of measuring video transmission delay video data.
Video data transmits with the Streaming Media form, and in general the transmission course of whole video needs a period of time.When measuring, can measure the propagation delay time of the propagation delay time of certain frame of video, also can in the video transmission process, repeatedly measure the propagation delay time of each frame of video, thereby reflect the variation of propagation delay time in the whole video transmission course dynamically as whole video.
Below with specific embodiment and being elaborated in conjunction with the accompanying drawings, wherein: embodiment one provides a kind of propagation delay time of measuring certain frame of video in the video transmission process, with the propagation delay time of this frame of video technical scheme as the whole video propagation delay time; Embodiment two provides a kind of propagation delay time of repeatedly measuring each frame of video in the video transmission process, thereby obtains the dynamic change situation of time delay in the whole video transmission course; Embodiment three provides a kind of video transmission delay of session service measuring system that comprises two measurement mechanisms.
Embodiment one
Embodiment one at first provides a kind of measurement mechanism of video transmission delay of session service, as shown in Figure 3, comprising: pretreatment module 301, measurement mechanism sending module 302, measurement mechanism receiver module 303, determination module 304.
Wherein, pretreatment module 301 is used for the video data that will send is done preliminary treatment, adds the test sign in the frame of video of video data; Measurement mechanism sending module 302 sends to the video class business platform with pretreated video data, and record sends the time of the frame of video with test sign; After the video class business platform carries out Business Processing to video data, send the processed video data; The video data that measurement mechanism receiver module 303 receiver, video class business platforms send writes down the time of reception of this frame of video when receiving the frame of video with test sign; Determination module 304 obtains the time of reception of these frame of video from the transmitting time of measurement mechanism sending module 302 these frame of video of acquisition from measurement mechanism receiver module 303; The transmitting time that deducts this frame of video with the time of reception of this frame of video obtains the propagation delay time of this frame of video, with the propagation delay time of this propagation delay time as video.
In the above-mentioned module,,, that is to say that pretreatment module 301 can be independent of measurement mechanism video data is carried out preliminary treatment so measurement mechanism not necessarily will comprise pretreatment module 301 owing to can carry out preliminary treatment to video data in advance; Measurement mechanism carries out the measurement of video transmission delay by pretreated video data.
The concrete function of each module is:
When those skilled in the art add the test sign in certain specific region of frame of video, both can be that the test sign that small echo or discrete cosine transform obtain having special characteristic is carried out in the specific region, also can in the specific region of choosing, add pixel-matrix (color lump) according to actual conditions with special characteristic.For example in a two field picture of frame of video pixel-matrix correspondence, choose the upper left corner or the lower right corner as the specific region.Those skilled in the art also can decide test sign according to actual conditions, can be the pixel-matrixs of being scheduled to certain feature such as the test sign, the dot matrix shape can the side of being, circle or other shape arbitrarily.For example, as test sign, 30 * 10 the rectangular lattice that perhaps will have black " test " printed words specifically can have various tests to identify as test sign or the like, repeats no more herein with one 10 * 10 blue dot matrix.The coded format of the pixel-matrix of in general, test sign is identical with the video data encoding form: if video data is a rgb format, then testing identification data also is rgb format; If video data is a yuv format, then testing identification data also is yuv format.
Measurement mechanism sending module 302, the video data that is used for having added the test sign in frame of video sends to the video class business platform, and record sends the time T 1 of the frame of video that the test sign is arranged.The video class business platform is handled the video data that receives.
Measurement mechanism receiver module 303 is used to receive the video data of handling through the video class business platform, and when receiving the frame of video with test sign, recorder time T 2.
Measurement mechanism receiver module 303 is for the frame of video that receives, and whether the specific region of detecting frame of video has the test sign, has the test sign if detect the specific region of certain frame of video, then writes down the time of reception of this frame of video.
In the embodiment of the invention, measurement mechanism sending module 302 is used to simulate the user A that sends video, and measurement mechanism receiver module 303 is used to simulate the user B of receiver, video.
Measurement mechanism sending module 302 both can be arranged in same entity with measurement mechanism receiver module 303, also can lay respectively in the entity of the entity that sends video and receiver, video.
Embodiment one also provides a kind of method of measurement of video transmission delay of session service, and flow chart specifically comprises the steps: as shown in Figure 4
Step S401: the video data in the Streaming Media source is carried out preliminary treatment, and the test sign is added in the specific region in the frame of video of video data.
Frame of video is divided into key frame and non-key frame usually.Key frame is the frame of video with complete frame image information; But not key frame is the frame of video that comprises image change information on the basis of key frame.
Both can in key frame, add the test sign and also can in non-key frame, add the test sign.Since in the process of video transmission generally with the arrival of key frame as the sign that receives associated video, join in the key frame so in specific implementation, generally will test to identify.
Step S402: send the video data that has added the test sign to the video class business platform, and record sends the time T 1 of the frame of video that the test sign is arranged.
Step S403: receive the video data of handling through the video class business platform, and when receiving the frame of video with test sign, recorder time T 2.
For the frame of video that receives, whether the specific region of detecting frame of video has the test sign, has the test sign if detect the specific region of certain frame of video, then writes down the time of reception of this frame of video.For example, detect " test " printed words in one 30 * 10 the rectangular lattice in the upper left corner of frame of video, be defined as the test sign, then write down the time of reception of this frame of video.
Step S404: determine video transmission delay according to time T 1, T2.
Concrete, T2 deducts T1 with the time, obtains video transmission delay.
The embodiment of the invention one is because by adding the test sign in frame of video, and detect frame of video and handle the back arrival used time of receiving terminal through the video class business platform from transmitting terminal with the sign of testing, comprise the video class business platform in the measurement result to traffic handling time, therefore improved the accuracy of measurement result.
Embodiment two
Embodiment two provides a kind of device of repeatedly measuring the frame of video propagation delay time in the video transmission process, as shown in Figure 5, comprising: pretreatment module 501, measurement mechanism sending module 502, measurement mechanism receiver module 503, corresponding relation memory module 504, determination module 505.
Measurement mechanism sending module 502, be used for sending the video data added the test sign, and will have the transmitting time and corresponding being saved in the corresponding relation memory module 504 of order information during each frame of video test identifies of each frame of video of test sign to the video class business platform.
Measurement mechanism receiver module 503 is used to receive the video data of handling through the video class business platform, when receiving the frame of video with test sign, writes down the time of reception of this frame of video, extracts order information from the test sign of this frame of video.
Further, can also comprise display module (among the figure mark), the video transmission delay of determining in order to real-time demonstration determination module 505.
Because a plurality of frame of video of adding the test sign are arranged in video data, so in the process that video data transmits in the Streaming Media mode, can obtain the propagation delay time of a plurality of frame of video, these propagation delay times have reflected the situation of video data video transmission delay in whole transmission course dynamically.Display module is exported demonstration in real time with these propagation delay times, make survey crew can real-time monitored to the situation of change of video transmission delay.
Embodiment two provides a kind of method of measurement of video transmission delay of session service, and flow chart specifically comprises the steps: as shown in Figure 6
Step S601: the video data in the Streaming Media source is carried out preliminary treatment, in a plurality of frame of video of video data, add the test sign that comprises each frame of video transmitting time order information.
The scheme of embodiment one is to add the test sign in a frame of video, in order to connect the propagation delay time that repeatedly measures video in the process of video data with the transmission of Streaming Media form, can add the test sign in a plurality of frame of video.In the test sign, carried the sending order information of each frame of video with test sign.
For example, a kind of concrete method of carrying order information is: choose certain or certain several bytes in order to carry the order information that each frame of video sends in the test sign.For example, can utilize certain byte to carry digital information 1,2,3...... for 30 * 10 the rectangular lattice in the above-mentioned example with black " test " printed words.Like this, when sending first frame of video with test sign, this order information is a digital information 1; When second of transmission had the frame of video of test sign, this order information was digital information 2.......Certainly, carry digital information 1,2,3...... only is a kind of method of carrying order information, those skilled in the art can also have the multiple mode of carrying, and for example carry digital information of successively decreasing etc., repeat no more herein.
Step S602: send the video data added the test sign to the video class business platform, and will have the transmitting time and the corresponding preservation of order information during each frame of video test identifies of each frame of video of test sign.
Send in the process of video class business platform at the video data that will add the test sign, write down the transmitting time of each frame of video, and preserve order information in each frame of video test sign and corresponding relation with each frame of video transmitting time of test sign with test sign.
Concrete a kind of execution mode for example can be for each frame of video all according to the transmitting time serial number, and this numbering is the order information of corresponding frame of video.The order information that has different numberings is added in the test sign of each frame of video, in first byte of adding the test sign to.When sending each frame of video with test sign, write down the transmitting time of each frame of video, and with the transmitting time of this frame of video and order information during the test of this frame of video identifies---number corresponding preservation.Such as sending n frame of video, then will number n and the corresponding preservation of time that sends n frame of video.Those skilled in the art can also adopt other method to realize according to actual conditions, and for example every 5 frame of video, then interpolation has the methods such as test sign of order information in frame of video, repeats no more herein.
Step S603: receive the video data of handling through the video class business platform, when receiving frame of video, write down the time of reception of this frame of video, from the test sign of this frame of video, extract order information with test sign.
After having confirmed the test sign of receiver, video frame, from the test sign of this frame of video, extract order information.For example,, can from first byte of test sign, obtain the order information of this frame of video for the above-mentioned example that the order information that has different numberings is added in first byte of testing sign, that is the numbering of this frame of video sending order.
Step S604: determine the transmitting time of this frame of video according to the corresponding relation of preserving, according to the transmitting time of this frame of video, the propagation delay time that time of reception is determined video this moment.
Behind the order information that has obtained this frame of video, determine the transmitting time of this frame of video according to the corresponding relation of preserving.For example, for the above-mentioned order information that from first byte of test sign, obtains this frame of video, that is the example of the numbering of this frame of video sending order, suppose the m that is numbered that obtains, to find the frame of video transmitting time corresponding with numbering m then according to corresponding relation.Transmitting time and time of reception according to this frame of video just can have been determined the propagation delay time of system when transmitting this frame of video.
Because a plurality of frame of video of adding the test sign are arranged in video data, so in the process that video data transmits in the Streaming Media mode, can obtain the propagation delay time of a plurality of frame of video, these propagation delay times have reflected the situation of video data video transmission delay in whole transmission course dynamically.These propagation delay times can be exported demonstration in real time, make survey crew can real-time monitored to the situation of change of video transmission delay.Also can calculate its mean value or variance yields to the propagation delay time of these frame of video, with its mean value or variance yields as the whole video propagation delay time.So more can reflect propagation delay time whole in the whole video transmission course.
The embodiment of the invention two is because by adding the test sign in frame of video, and detect frame of video and handle the back arrival used time of receiving terminal through the video class business platform from transmitting terminal with the sign of testing, thereby measured accurately comprise the video class business platform to traffic handling time at interior video transmission delay, it is more accurate to measure than the scheme of the video transmission delay embodiment of the invention that does not comprise traffic handling time that adopts prior art to measure.
The embodiment of the invention two makes video data in the process with the transmission of Streaming Media form owing to also added the sending order information of frame of video in the test sign, can repeatedly measure the time delay of video transmission when each frame of video of transmission.
Embodiment three
The embodiment of the invention three provides a kind of measurement mechanism that provides by two embodiment one or embodiment two to carry out the scene that video transmission delay of session service is measured.Shown in Fig. 7 a, a kind of video transmission delay of session service measuring system comprises first measurement mechanism 701, second measurement mechanism 702.
The receiver module of video class business platform receives behind the video data that each measurement mechanism sends these video data decodings; The processing module of video class business platform is handled decoded video data, such as video data is mixed, various visual angles stack etc.; The video data that the sending module of video class business platform will be handled sends to each testing apparatus more respectively.
The embodiment of the invention three is owing to measuring by measurement mechanism simultaneously at two end points, so can measure the video transmission delay of session service simultaneously at the network two ends.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. the video transmission delay measurement mechanism of a video session class business is characterized in that, comprising:
The measurement mechanism sending module, the video data that is used for having added the test sign in a plurality of frame of video sends to the video class business platform, and record sends the time of each frame of video that the test sign is arranged, test sign in each frame of video includes the sending order information of this frame of video, and the frame of video transmitting time of record and the corresponding relation of the sending order information in this frame of video test sign are saved in the corresponding relation memory module;
The measurement mechanism receiver module, be used to receive described video data through after the described video class business platform Business Processing, and when receiving the frame of video of test sign, write down the time of reception of this frame of video, and from the test sign of this frame of video, extract sending order information;
Determination module, be used for corresponding relation that the sending order information extracted according to described measurement mechanism receiver module and described corresponding relation memory module preserve and determine the transmitting time of this frame of video, the time delay of video transmission when the time of reception of this frame of video that obtains according to the transmitting time of the frame of video that the test sign is arranged and from described measurement mechanism receiver module is determined to send this frame of video; Propagation delay time according to each frame of video of determining is determined video transmission delay.
2. device as claimed in claim 1 is characterized in that, also comprises:
Pretreatment module is used for adding the test sign in the frame of video of video data, and the video data that has added the test sign is sent to described measurement mechanism sending module.
3. device as claimed in claim 1 is characterized in that, also comprises:
Display module is used to the video transmission delay that shows that described determination module is determined.
4. the method for measurement of a video transmission delay of session service is characterized in that, comprising:
The video data that has added the test sign in a plurality of frame of video is sent to the video class business platform, and write down the time that sends each frame of video that the test sign is arranged, the test sign in each frame of video includes the sending order information of this frame of video;
Preserve the corresponding relation of the sending order information in frame of video transmitting time and this frame of video test sign;
Receive the described video data of handling through described video class business platform, and when receiving the frame of video of test sign, write down the time of reception of this frame of video, and from the test sign of this frame of video, extract sending order information, determine the transmitting time of this frame of video according to described corresponding relation;
The time delay of video transmission when determining to send this frame of video according to the time of reception of the transmitting time of the frame of video that test sign is arranged and this frame of video; Propagation delay time according to each frame of video of determining is determined video transmission delay.
5. method as claimed in claim 4 is characterized in that,
Described the video data that has added the test sign in a plurality of frame of video is sent to the video class business platform before, also comprise: in the frame of video of video data, add the test sign.
6. method as claimed in claim 4 is characterized in that, the propagation delay time of each frame of video that described basis is determined determines that video transmission delay specifically comprises:
The mean value or the mean-square value of the propagation delay time of each frame of video are defined as video transmission delay.
7. method as claimed in claim 5 is characterized in that, the described test sign of adding in frame of video specifically comprises: add the test sign in the key frame of frame of video or non-key frame.
8. the measuring system of a video transmission delay of session service is characterized in that, comprising:
First measurement mechanism and second measurement mechanism;
Described first measurement mechanism and second measurement mechanism are sent in the video data that has added the test sign in a plurality of frame of video by the video class business platform respectively, and recording the transmitting time of testing each frame of video that identifies respectively, the test sign in each frame of video includes the sending order information of this frame of video;
First measurement mechanism and second measurement mechanism are preserved the corresponding relation of the sending order information in frame of video transmitting time and this frame of video test sign respectively;
Described first measurement mechanism and second measurement mechanism receive respectively through described video class business platform and handle the video data that the back sends, and when receiving the frame of video of test sign, record the time of reception of the frame of video of test sign respectively, and from the test sign of frame of video, extract sending order information respectively, define the transmitting time of the frame of video of test sign according to the corresponding relation of preserving separately;
Described first measurement mechanism and second measurement mechanism be respectively according to the transmitting time of the frame of video of determining separately that the test sign is arranged and the time delay of video transmission when having the time of reception of the frame of video of test sign to determine to send the frame of video that the test sign is arranged, and determines separately video transmission delay according to the propagation delay time of each frame of video of determining respectively.
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| CN110855982B (en) * | 2019-12-02 | 2021-06-22 | 军事科学院系统工程研究院军用标准研究中心 | 4K video communication network quality metering method and device |
| CN111541919B (en) | 2020-05-13 | 2022-07-29 | 阿波罗智联(北京)科技有限公司 | Video frame transmission method and device, electronic equipment and readable storage medium |
| CN112788391B (en) * | 2021-01-22 | 2022-09-20 | 深圳创维－Rgb电子有限公司 | Key delay testing method and device, computer equipment and readable storage medium |
| CN113573160B (en) * | 2021-05-17 | 2022-03-22 | 南斗六星系统集成有限公司 | Method for determining video delay in real-time video |
| CN116389718A (en) * | 2023-05-26 | 2023-07-04 | 海马云（天津）信息技术有限公司 | Lightweight node delay detection method and device, electronic equipment and storage medium |
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| CN1516374A (en) * | 2003-01-06 | 2004-07-28 | 华为技术有限公司 | Base station controller and forward frame synchronous transmission method between base station transceivers |
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| CN109309831A (en) * | 2018-12-13 | 2019-02-05 | 苏州科达科技股份有限公司 | The test method and device of video delay in video conference |
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| CN101516017A (en) | 2009-08-26 |
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