CN102075768A - Video synchronization method during end-to-end video quality evaluation in wireless network - Google Patents

Video synchronization method during end-to-end video quality evaluation in wireless network Download PDF

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Publication number
CN102075768A
CN102075768A CN2009101991180A CN200910199118A CN102075768A CN 102075768 A CN102075768 A CN 102075768A CN 2009101991180 A CN2009101991180 A CN 2009101991180A CN 200910199118 A CN200910199118 A CN 200910199118A CN 102075768 A CN102075768 A CN 102075768A
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video
time point
destination
synchronization method
video file
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CN2009101991180A
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Chinese (zh)
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吴春薇
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Shanghai Beiyade Information Technology Co Ltd
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Shanghai Beiyade Information Technology Co Ltd
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Abstract

The invention discloses a video synchronization method during end-to-end video quality evaluation in a wireless network, which comprises the following steps that: 1, a source end and a destination end establish video connection at a preset time point and keep the video connection; 2, the source end sends an Internet protocol (IP) data packet to the destination end, wherein the content of the data packet is a time point after a fixed time period and represents that the source end starts playing a standard video file at the time point; 3, after receiving the data packet, the destination end starts recording at the time point; and 4, after the time point is reached, the source end starts playing the standard video file, and the destination end starts recording simultaneously, so that the starting time point of the video file recorded by the destination end and the starting time point of the standard video file are synchronized. By the method, handshake synchronization is performed, and the playing action of the source end and the recording action of the destination end are synchronized, so that the complexity of a system is reduced, and the stability and cost performance of the system are improved.

Description

Video synchronization method when carrying out end-to-end video quality assessment in the wireless network
Technical field
The present invention relates to carry out in the wireless network end-to-end video quality assessment field, particularly relate under the pure IP standard such as CDMA-EVDO-LTE or CS/PS such as WCDMA-HSDPA, TD-SCDMA (circuit switching, packet exchange) mix under the standard, the video synchronization method when carrying out end-to-end video quality assessment in the wireless network.
Background technology
In the prior art, some confessed in the world voice assessment algorithms are followed in end-to-end video quality test usually, comprise ITU-T PEVQ video quality assessment algorithm J.247.The part of its core essence, all be will the source video file and through obtain behind the tested network the video file do a contrast, according to corresponding algorithm, calculate MOS value (the mean opinion score of current video, mean opinion score, being a kind of line terminal that is provided at, particularly is the speech communication of representative with the Internet, the method for measures of quantization of voice quality).In including, but are not limited to the higher communication system in 3G, 3.5G, 3.75G, 4G and even back, video traffic will more and more be used.And how to understand the operation conditions of current video system, be the task of top priority in face of the engineer of operator.The business of video is a lot, includes, but are not limited to video calling (VT), streaming media service, video message (videomessage) etc.These business are selected different signaling methods and compression standard (include but not limited to MPEG-4, H.264 wait) for use according to the situation of carrier network and user's custom.Present traditional video measurement equipment all is the unit version, is applicable to small lot, fixed test.The system that can carry out long-time uninterrupted extensive video quality test in 7 * 24 hours does not also have ripe scheme.
The present PEVQ that uses, when perhaps the MDI algorithm is tested, in order to solve operator's end-to-end test monitoring problem for video quality in the 3G wireless network, the video quality assessment system all can use the video assessment algorithm usually, as PEVQ, MDI, MDI+, MOS V or the like.In these algorithms, most of algorithm all requires transmitting terminal to carry out the time point of video transmission and the time point that receiving terminal begins to record a video, and is synchronous as far as possible.And the problems such as time delay in the wireless network are more outstanding, if do not carry out Synchronous Processing, can greatly influence the assessment effect of these algorithms, and even allow algorithm assessment result complete failure.Beginning to need a synchronous process before the test, comparing source file in the hope of the file that produces can be accurate.In including, but are not limited to the higher communication system in 3G, 3.5G, 3.75G, 4G and even back, the clock source that a systematic unity is all arranged usually, be used for the synchronous of whole communication system, this clock can be a clock source accurately, also can be the GPS isochronon.End product also can to reach a correct time synchronous by obtain clock from system, also can obtain clock from GPS isochronon source.
In large-scale automatic video quality test macro,, need system to record a video automatically owing to can't carry out manual intervention.And in existing video quality assessment algorithm, if source file is inconsistent with the starting point of the video file that receives, then will has a strong impact on the assessment result of video quality, thereby can not truly correctly react actual conditions.If the video file that receives is handled with program, which picks out is noise before and the various signals in the call establishment, need use video identification technology, realize very complicated from technology, need a large amount of coding and test job, cost performance is too low, the influence that can't avoid system's time delay that test is brought simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is to realize the defective complicated, that cost performance is low when overcoming video identification in the prior art, and the video synchronization method when carrying out end-to-end video quality assessment in a kind of wireless network is provided.
The present invention solves above-mentioned technical problem by following technical proposals:
Video synchronization method when carrying out end-to-end video quality assessment in a kind of wireless network, its characteristics are that it may further comprise the steps:
S 1, source end and destination set up video and be connected and keep on default time point;
S 2, the source end sends an IP packet to destination, the content of packet is a time point after the set time section, the source end will begin the playing standard video file when being illustrated in this time point;
S 3, after destination receives this packet, will when described time point, begin video recording;
S 4, after described time point arrives, the source end begins the playing standard video file, destination begins video recording simultaneously, the video file start time point under the destination record and the start time point of normal video file reach synchronous.
Preferably, step S 1In, the video of foundation connects and comprises the calling of video calling, the connection of Streaming Media or the connection of video message.
Preferably, step S 2In time point be a time point after the destination current time.
Preferably, described method for synchronous carries out in the 3G-4G of pure IP network.
Preferably, described method for synchronous carries out under the CDMA-EVDO-LTE standard.
Another technical scheme of the present invention is: the video synchronization method when carrying out end-to-end video quality assessment in a kind of wireless network, and its characteristics are that it may further comprise the steps:
T 1, source end and destination set up video in the default time and be connected and keep;
T 2, the source end sends the default image of some frames to destination, the source end will begin the playing standard video file when being illustrated in the time point after this default image plays;
T 3, destination receives and prepares video recording behind this default image;
T 4, after the time point of described default image after playing arrive, the source end begins the playing standard video file, destination begins video recording simultaneously, the video file start time point under the destination record and the start time point of normal video file reach synchronous.
Preferably, step T 2In default image be the image that can not occur in the normal video file.
Wherein, the image that can not occur in the described normal video file is red, full indigo plant or complete green image entirely.
Preferably, described method for synchronous carries out under circuit switching, packet exchange mixing standard.
Preferably, described method for synchronous carries out under WCDMA-HSDPA or TD-SCDMA standard.
Above-mentioned two schemes are respectively the method for synchronous that carries out under CDMA-EVDO-LTE standard and WCDMA-HSDPA-LTE or TD-SCDMA-LTE standard, and both belong to same inventive concept, and are interrelated technically.
Positive progressive effect of the present invention is: shake hands synchronously by the method among the present invention, the playback action of source end and the video recording of destination are moved synchronously, greatly reduce the complexity of system, improved the stability and the cost performance of system.
Description of drawings
Fig. 1 is in the embodiment of the invention 1, the method for synchronous flow chart under the CDMA-EVDO-LTE standard.
Fig. 2 is in the embodiment of the invention 2, the method for synchronous flow chart under WCDMA-HSDPA-LTE or the TD-SCDMA-LTE standard.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
Embodiment 1
As shown in Figure 1, present embodiment is under CDMA-EVDO-LTE pure IP standards such as (a kind of agreements of the prior art), and the video synchronization method when carrying out end-to-end video quality assessment in the wireless network describes.Wherein pure IP standard is a prior art, promptly usually for 2G and communication network more early, be one by one cable such as our landline telephone, on the basis of this cable, by time-division (TD), frequency division (FD), empty method of dividing (SD), sign indicating number to divide (CD), reach one multiplexing.Such as a common E1 circuit, 30 tunnel conversations simultaneously are divided into very little very little sheet to the time, exactly such as 5 milliseconds of a slices.First 5 milliseconds is user A conversation, and second is user B..., and these all are the Circuit-switched contents (circuit switch) that belongs to traditional.Along with development of Communication Technique, IP network was arranged afterwards, and on IP network, develop and huge communication system, comprised the conversation (VOIP) above the IP, the video above the IP etc.Develop into after the 3G, because 3G has three kinds of standards, CDMA-EVDO system, WCDMA system, TD-SCDMA system.The core net part of CDMA-EVDO system because be that the U.S. proposes, is all walked IP so propose inside, does not walk the circuit exchange fully.And for WCDMA system and TD-SCDMA system, Circuit-switched part before also having kept, their core net is divided into two parts, CS (circuit switching) and PS (packet switch, packet switch are exactly IP in fact).
Step 101, test macro can be carried out corresponding video and be connected (between source end and the destination, promptly between calling terminal and the called end) on the set time point of system, connect and keep.Connect the calling that includes, but are not limited to VT (video calling), the connection of Streaming Media, the connection of video message (video message) etc.
Step 102, after connecting maintenance, because the video traffic in the present embodiment all is based on IP's, the source end can send an IP packet to destination, the content of packet for example is (these values in 15 seconds, the engineer can carry out suitable prolongation or shortening according to the experience of oneself and the situation of local networks, adjusts accordingly) after a time point.Be exemplified below, the current time of source end is 350 milliseconds of 20: 01: 32 evenings on October 23rd, 2009, and then the content of IP packet is " on October 23rd, 2,009 20: 01: 47 evening 350 milliseconds ".Promptly test will be in 350 milliseconds of beginnings in 47 seconds in 01 fen at 20 o'clock in evening on October 23rd, 2009, and when arriving this time point, the source end will begin the playing standard video.
When destination is received this packet, even consider the time-delay of current IP network, this constantly (on October 23rd, 2,009 20: 01: 47 evening 350 milliseconds) yet do not arrive, destination will begin video recording when this arrives constantly.
Step 103, after time point (on October 23rd, 2,009 20: 01: 47 evening 350 milliseconds) arrives, source end, destination begin action simultaneously, and the start time point of the video file under the destination record just can reach synchronously accurate fully with the starting point of normal video file like this.
Above-mentioned steps 101～103, those skilled in the art can go concrete realization according to its relevant knowledge known and the disclosed content of this specification, and the specific implementation of each step is the state of the art, is not inventive point of the present invention place.
Embodiment 2
As shown in Figure 2, present embodiment is used for explanation under CS/PS (circuit switching, packet exchange) such as WCDMA-HSDPA (a kind of agreement of the prior art) or TD-SCDMA mix standard, the video synchronization method when carrying out end-to-end video quality assessment in the wireless network.Step 201, test macro can be carried out corresponding video and be connected (between calling terminal and the called end) on the set time point of system, connect and keep.
Step 202, after connecting maintenance, because under this standard, video traffic is based on the CS channel, the source end can be sent out the frame particular image a few and can conform to the principle of simplicity to dissolve for destination, this particular image and send out, may be defined as red entirely, full indigo plant, green entirely, as complete red 3 frames, complete blue 3 frames, complete green 3 frames, promptly can be the image that can not occur in the normal video file.The source end will begin the playing standard video file when being illustrated in the time point after complete green 3 frames of this particular image play.
Step 203, destination are prepared video recording after receiving this particular image.
Step 204, after the time point after described particular image plays arrived, source end, destination began action simultaneously, and the start time point of the video file under the destination record can reach complete precise synchronization with the starting point of normal video file like this.
Above-mentioned steps 201～204, those skilled in the art can go concrete realization according to its relevant knowledge known and the disclosed content of this specification, and the specific implementation of each step is the state of the art, is not inventive point of the present invention place.
Agreement and algorithm that above English is write a Chinese character in simplified form are prior art, do not repeat them here.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these execution modes.Therefore, protection scope of the present invention is limited by appended claims.

Claims (10)

1. the video synchronization method when carrying out end-to-end video quality assessment in the wireless network is characterized in that it may further comprise the steps:
S 1, source end and destination set up video in the default time and be connected and keep;
S 2, the source end sends an IP packet to destination, the content of packet is a time point after the set time section, the source end will begin the playing standard video file when being illustrated in this time point;
S 3, after destination receives this packet, will when described time point, begin video recording;
S 4, after described time point arrives, the source end begins the playing standard video file, destination begins video recording simultaneously, the video file start time point under the destination record and the start time point of normal video file reach synchronous.
2. video synchronization method as claimed in claim 1 is characterized in that step S 1In, the video of foundation connects and comprises the calling of video calling, the connection of Streaming Media or the connection of video message.
3. video synchronization method as claimed in claim 1 is characterized in that step S 2In time point be a time point after the destination current time.
4. as any described video synchronization method of claim 1-3, it is characterized in that described method for synchronous carries out in the 3G-4G of pure IP network.
5. video synchronization method as claimed in claim 4 is characterized in that described method for synchronous carries out under the CDMA-EVDO-LTE standard.
6. the video synchronization method when carrying out end-to-end video quality assessment in the wireless network is characterized in that it may further comprise the steps:
T 1, source end and destination set up video in the default time and be connected and keep;
T 2, the source end sends the default image of some frames to destination, the source end will begin the playing standard video file when being illustrated in the time point after this default image plays;
T 3, destination receives and prepares video recording behind this default image;
T 4, after the time point of described default image after playing arrive, the source end begins the playing standard video file, destination begins video recording simultaneously, the video file start time point under the destination record and the start time point of normal video file reach synchronous.
7. video synchronization method as claimed in claim 6 is characterized in that step T 2In default image be the image that can not occur in the normal video file.
8. video synchronization method as claimed in claim 7 is characterized in that, the image that can not occur in the described normal video file is red, full indigo plant or complete green image entirely.
9. as any described video synchronization method of claim 6-8, it is characterized in that described method for synchronous carries out under circuit switching, packet exchange mixing standard.
10. video synchronization method as claimed in claim 9 is characterized in that, described method for synchronous carries out under WCDMA-HSDPA or TD-SCDMA standard.
CN2009101991180A 2009-11-20 2009-11-20 Video synchronization method during end-to-end video quality evaluation in wireless network Pending CN102075768A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107342876A (en) * 2016-04-29 2017-11-10 展讯通信（上海）有限公司 The method of testing and system of mobile terminal video speech quality

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107342876A (en) * 2016-04-29 2017-11-10 展讯通信（上海）有限公司 The method of testing and system of mobile terminal video speech quality

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Application publication date: 20110525