WO2015003302A1 - 视频播放的控制方法、设备及系统 - Google Patents

视频播放的控制方法、设备及系统 Download PDF

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Publication number
WO2015003302A1
WO2015003302A1 PCT/CN2013/079003 CN2013079003W WO2015003302A1 WO 2015003302 A1 WO2015003302 A1 WO 2015003302A1 CN 2013079003 W CN2013079003 W CN 2013079003W WO 2015003302 A1 WO2015003302 A1 WO 2015003302A1
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WO
WIPO (PCT)
Prior art keywords
video
video stream
speed
client
playback
Prior art date
Application number
PCT/CN2013/079003
Other languages
English (en)
French (fr)
Inventor
王帅
王峰
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380001315.1A priority Critical patent/CN104782169B/zh
Priority to JP2016524647A priority patent/JP6280644B2/ja
Priority to PCT/CN2013/079003 priority patent/WO2015003302A1/zh
Priority to KR1020167001292A priority patent/KR101782453B1/ko
Priority to EP13889283.1A priority patent/EP2999260B1/en
Publication of WO2015003302A1 publication Critical patent/WO2015003302A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21Server components or server architectures
    • H04N21/218Source of audio or video content, e.g. local disk arrays
    • H04N21/21805Source of audio or video content, e.g. local disk arrays enabling multiple viewpoints, e.g. using a plurality of cameras
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/24Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
    • H04N21/2401Monitoring of the client buffer
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/242Synchronization processes, e.g. processing of PCR [Program Clock References]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/433Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4331Caching operations, e.g. of an advertisement for later insertion during playback
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637Control signals issued by the client directed to the server or network components
    • H04N21/6377Control signals issued by the client directed to the server or network components directed to server

Definitions

  • Video playback control method device and system
  • the embodiment of the invention relates to the field of video surveillance services, and particularly relates to a control method, device and system for video playback. Background technique
  • a video surveillance system In recent years, in order to improve public safety, a video surveillance system is usually deployed to monitor and record public areas. For some important places, such as airports, banks, intersections, etc., multiple front-end devices (usually cameras) can be set to monitor the same location from multiple locations to further improve security.
  • front-end devices usually cameras
  • the public security criminal investigators or other security personnel often need to synchronize the playback and observation and analysis of the multi-channel video in order to grasp the key information of the time zone of the crime, and provide more valuable clues for handling the abnormal situation.
  • the prior art is to perform synchronous playback of multiple videos on the same client.
  • the interface of the display is divided into several windows, such as four, eight or more.
  • the multi-channel video is displayed in different windows, which requires multiple people to look at different windows of one display at the same time.
  • the inventor found that the method has the following disadvantages: (1) The more the window of the interface of the display is divided, the smaller the picture in each window is, and the even the details of the picture cannot be recognized, which affects the accuracy of the observation and analysis; (2) due to the size of the display With limited resolution, it is impossible to achieve more people's coordinated operations, and can't meet the needs of multi-person collaborative reading. (3) When the case needs to be handled jointly, the existing solutions cannot achieve multi-site and multi-person collaborative access. Video needs. Summary of the invention
  • An object of the embodiments of the present invention is to provide a control method, device, and system capable of synchronously playing back video playback of multiple monitoring videos on multiple clients.
  • a method for controlling video playback comprising:
  • the video monitoring platform pushes one or more video streams of the same time period to multiple clients in the observation group;
  • a video playback control unit of the video surveillance platform according to the received speed of the received video stream Degree and cache value adjust the push speed of the video stream;
  • the video monitoring platform pushes the video stream to the client according to the pushing speed for the client to play.
  • the video surveillance platform creates observation groups for multiple clients.
  • the step of: adjusting the pushing speed of the video stream according to the receiving speed and the buffer value is specifically:
  • the push speed of the video stream is adjusted to be:
  • the buffer value of the video stream is greater than C min ;
  • the buffer value of the video stream is greater than C min ;
  • the current playback speed be n*V p and the current video streaming speed be 1 ⁇ 4. Adjust the video streaming speed of the video monitoring platform to push the i-th playback.
  • C t . Tal is the size of the buffer allocated by each client in the observation group for each playback.
  • C max is the upper limit of the alert
  • C min is the lower alert limit
  • a video playback control unit including: a video stream push module, a receiving module, and a push speed adjustment module, where:
  • a video stream pushing module configured to respectively push one or more video streams with the same time period to multiple clients in the observation group
  • a receiving module configured to receive a receiving speed of the one or more video streams of the client and a buffer value of the video stream that are sent by the multiple clients to the video playback control unit of the video monitoring platform;
  • a push speed adjustment module configured to adjust a push speed of the video stream according to the receiving speed and the buffer value
  • the video stream pushing module is further configured to push the video stream to the client according to the pushing speed for the client to play.
  • the method further includes: an invitation message sending module, configured to send an invitation message to the client, and invite the client to join the observation group.
  • the chair of the observation group adjusts the playback speed of the client
  • the video playback control unit of the video monitoring platform adjusts the playback speed of the video stream of other clients in the observation group.
  • a video monitoring platform including:
  • a video transceiver unit configured to receive a video stream sent by the front end device
  • a video storage unit configured to store a video stream received by the video transceiver unit
  • the video playback control unit further includes: a video stream pushing module, configured to respectively push one or more video streams of the same time period to the plurality of clients in the observation group; and the receiving module is configured to receive the a plurality of clients periodically send the speed of one or more video streams of the client and the buffer value of the video stream to the video playback control unit of the video monitoring platform; a push speed adjustment module, configured to The cache value adjusts the push speed of the video stream.
  • the video stream push module is further configured to push the video stream to the client according to the push speed for the client to play.
  • the video playback control unit further includes: an invitation message sending module, configured to send an invitation message to the client, and invite the client to join the observation group.
  • the chairperson of the observation group adjusts the client playing speed
  • the video playback control unit of the video monitoring platform adjusts the observation accordingly.
  • a video surveillance system including:
  • a front-end device for capturing video and transmitting the video to a video surveillance platform
  • a client device configured to receive a video stream pushed by the video monitoring platform and play the same
  • Video monitoring platform the video monitoring platform includes:
  • a video transceiver unit configured to receive a video stream sent by the front end device
  • a video storage unit configured to store a video stream received by the video transceiver unit
  • the video monitoring platform further includes:
  • the video playback control unit further includes: a video stream pushing module, configured to respectively push one or more video streams of the same time period to the plurality of clients in the observation group; and the receiving module is configured to receive the a plurality of clients periodically send the speed of one or more video streams of the client and the buffer value of the video stream to the video playback control unit of the video monitoring platform; a push speed adjustment module, configured to The cache value adjusts the push speed of the video stream.
  • the video stream push module is further configured to push the video stream to the client according to the push speed for the client to play.
  • the video playback control unit further includes: an invitation message sending module, configured to send an invitation message to the client, and invite the client to join the observation group.
  • the video playback control unit further includes: a video stream push speed adjustment module, configured to use the initial speed V0 in the video monitoring platform to each of the observation groups During the playback of the member push video stream, if the chairman adjusts the client playback speed, such as 1/2 times, 4 times V p, etc., the video playback control unit of the video monitoring platform adjusts the other clients in the observation group accordingly.
  • Video streaming speed if the chairman adjusts the client playback speed, such as 1/2 times, 4 times V p, etc.
  • the invention has the beneficial effects that: the video playing control unit of the video monitoring platform uniformly controls the synchronous playing of the multi-client and the multi-channel video, so that the multi-site and multi-client can cooperate with each other, so that multiple observers can conveniently differently
  • the client views multiple channels of the same time period; thus achieving more
  • the client synchronizes playback and collaboratively accesses the video information of the multi-channel camera, quickly grasps the key information of the case, and improves the efficiency of case handling.
  • FIG. 1 is a schematic structural diagram of a video monitoring system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the composition of a video playback control unit according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a video playback control method according to an embodiment of the present invention.
  • 4a-4b are schematic diagrams of a client interface according to an embodiment of the present invention.
  • Figure 5 is a flow chart of the first embodiment of the present invention.
  • Figure 6 is a flow chart of a second embodiment of the present invention.
  • Figure 7 is a flow chart of a third embodiment of the present invention.
  • Figure 8 is a flow chart of a fourth embodiment of the present invention.
  • Figure 9 is a flow chart of a fifth embodiment of the present invention.
  • Figure 10 is a flow chart of a sixth embodiment of the present invention.
  • Figure 11 is a flow chart of a seventh embodiment of the present invention.
  • Figure 12 is a flow chart of an eighth embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of still another embodiment of the video monitoring platform of the present invention.
  • FIG. 1 is a schematic structural diagram of a video monitoring system according to an embodiment of the present invention.
  • the video monitoring system includes a client 10, a video monitoring platform 20, and a front end device 30.
  • the client 10 is a specific entity device or a virtual device that carries the client function, and is usually provided with multiple monitoring functions.
  • the client 10 can be a PC client or a mobile client, such as a mobile device such as a mobile phone, a PC, or a MediaPad.
  • the video monitoring platform 20 communicates with the client 10 and the headend device 30 via a wired network such as a coaxial cable, an optical fiber, or the like, or a wireless network such as Bluetooth, infrared, WIFI, GPRS, LTE, or the like.
  • the video monitoring platform 20 generally includes: a video transceiver unit 22, configured to receive a view sent by the front end device
  • the video storage unit 24 is configured to store the video stream received by the video transceiver unit 22, and the video playback control unit 26 is configured to control the video stream that is pushed to the client 10.
  • the video playback control unit 26 may be a physical device that is separately disposed in the video surveillance system, or may be integrated into the existing video surveillance platform 20 as a functional unit, or may be integrated in the client 10 as needed. The embodiment of the present invention is described by being integrated into the existing video monitoring platform 20.
  • FIG. 2 it is a schematic diagram of a composition of a video playback control unit 26 according to an embodiment of the present invention.
  • the video playback control unit 26 includes:
  • the video stream pushing module 261 is configured to respectively send one or more video streams of the same time period to the plurality of clients in the observation group; and the receiving module 262 is configured to receive the plurality of clients periodically to the video monitoring platform.
  • the video stream pushing module 261 is further configured to push the video stream to the client 10 according to the pushing speed for the client 10 to play.
  • FIG. 3 is a flowchart of a video playback control method according to an embodiment of the present invention, where the method includes the following steps:
  • the video monitoring platform respectively pushes one or more video streams with the same time period to multiple clients in the observation group.
  • S104 Receive one or more video stream receiving speeds of the client and a buffer value of the video stream that are sent by the multiple clients to the video playing control unit of the video monitoring platform.
  • Step S106 The video playback control unit of the video surveillance platform adjusts the push speed of the video stream according to the received speed and the buffer value of the received video stream.
  • Step S106 is specifically:
  • the push speed of the video stream is adjusted to be:
  • the buffer value of the video stream is greater than C min ;
  • the buffer value of the video stream is greater than C min ;
  • the current playback speed be n*V p and the current video streaming speed be 1 ⁇ 4. Adjust the video streaming speed of the video monitoring platform to push the i-th playback.
  • C t . Tal is the size of the buffer allocated by each client in the observation group for each playback
  • Q is the current cache value size flag of the i-th playback
  • c max is the upper limit of the alert
  • c min is the lower alert limit
  • n can be a natural number or a fraction, such as 1 /4 1/2 2 4 and so on.
  • each client feeds back to the video playback control unit the size of the current video stream buffer value played back by each channel in the client. Thereafter, each time a ⁇ time elapses, a feedback is initiated.
  • the video playback control unit notifies the video monitoring platform to adjust the push speed of each video stream according to the received feedback information to implement synchronous control.
  • the video monitoring platform pushes the video stream to the client according to the pushing speed for the client to play.
  • the method further includes:
  • Step S101 The video monitoring platform creates an observation group for multiple clients, specifically: after the user logs in to the client, the online client can be selected, and the interface of the client is selected as shown in FIG. 4a. Shown.
  • the watch group is created by the video surveillance platform:
  • the client initiates the request to create the watch group, and the video monitoring platform receives the request.
  • the observation group creation request obtain the client list, and feed back the media capabilities (bandwidth, CPU, memory, decoding capability, etc.) of the client in the list, and the client client 1 according to the video monitoring platform to feed back the client list and the client.
  • Media ability selects the client to join the observation group.
  • the invited client can choose whether to accept the invitation. If you choose to accept the invitation, join the observation group.
  • the video monitoring platform can feed back the creation result to the client 1 requesting the creation of the observation group, such as how many clients join the observation group, and how many clients do not join the observation group.
  • the client interface is shown in Figure 4b. .
  • the chairperson can periodically obtain the media capabilities (bandwidth, CPU, memory, and decoding capabilities) of each member in the observation group. If the media capability of a client is found to be severely degraded, the client endpoint can be reduced. The number of video channels or the client is removed, so the number of redundant video channels generated is hosted by the chairman and can be reassigned by the chair to other observers.
  • media capabilities bandwidth, CPU, memory, and decoding capabilities
  • the user can also broadcast the message of creating the observation group to the local area network, and other clients that receive the message in the local area network can choose to join the observation group.
  • the user may send a request message for creating an observation group to the video monitoring platform by the user, and the video monitoring platform sends a message to all clients. After receiving the message of the video monitoring platform, other clients may choose to join the message. Observation group.
  • the permission control mode of the observation group is as follows:
  • the administrator has the functions of adding and deleting members in the observation group, selecting one or more channels to be observed, and assigning the selected videos to be observed to each member;
  • the chairman has the right to control all the synchronized videos in the observation group for unified playback; the observer has the right to control the playback of the video of the client.
  • step S108 further comprising a step S109, as shown in Figure 8: video surveillance platform at an initial speed V 0 push video stream to the group members within the observation, in the client during playback, the observation group
  • the chairman adjusts the playback speed of the client, such as 1/2 times, 4 times V p, etc.
  • the video playback control unit of the video monitoring platform adjusts the playback speed of the video stream of other clients in the observation group accordingly.
  • each member in the observation group can set a follow-up strategy during synchronous playback. For "Play Priority” or "Sync Priority”.
  • the "synchronization priority" policy is as follows: As shown in Figure 9, after the chairperson chooses to pause all the videos in the observation group, the video playback of all members is suspended, and a message is received to notify that "a certain chairman has performed a video on a certain channel. Pause operation", only the chairman can resume video synchronization playback, other members can not operate. As shown in FIG. 10, after the pause operation is performed from the observer 1, the other video playback from the observer is suspended, and a message is received to notify that "a member has paused the video of a certain channel", at this time only the chairman and the proceeding The slave watcher 1 who pauses the operation can resume the video sync play, and other members cannot operate.
  • the "play priority" policy is specifically as follows: As shown in Figure 11, after the chairperson chooses to pause all the videos in the observation group, the video monitoring platform notifies all members of the observation group to pause the video playback, and sends a pause to all members of the observation group. Message prompt: "A chairperson paused a video.” Only the chairperson can resume video playback, and other members cannot operate. As shown in Figure 11, after the chairperson chooses to pause all the videos in the observation group, the video monitoring platform notifies all members of the observation group to pause the video playback, and sends a pause to all members of the observation group. Message prompt: "A chairperson paused a video.” Only the chairperson can resume video playback, and other members cannot operate. As shown in Figure 11, after the chairperson chooses to pause all the videos in the observation group, the video monitoring platform notifies all members of the observation group to pause the video playback, and sends a pause to all members of the observation group. Message prompt: "A chairperson pause
  • the other receives a message from the observer that "a member has paused the video of the certain channel", but the other video playback from the observer is not suspended. deal with.
  • the viewer 1 performs a pause operation, when the video is paused for playback, you can choose to jump directly to the current time point of the synchronized play, or you can choose to fast forward to the current time of the synchronized play at 2 or 4 times. point.
  • FIG. 13 is a schematic structural diagram of still another embodiment of a video monitoring platform according to the present invention.
  • the video monitoring platform 20 includes a processor 51, a receiver 52, a transmitter 53, a random access memory 54, and a read only memory 55. Bus 56 and network interface unit 57.
  • the processor 51 is coupled to the receiver 52, the transmitter 53, the random access memory 54, the read only memory 55, and the network interface unit 57 via the bus 56, respectively.
  • the basic input/output system in the read-only memory 55 or the bootloader booting system in the embedded system is booted to boot the video monitoring platform into a normal running state.
  • the application and operating system are run in the random access memory 54, receiving data from the network or transmitting data to the network, such that:
  • the receiver 52 is configured to receive, by the plurality of clients, a one-way or multiple video stream receiving speeds of the client and a buffer value of the video stream that are periodically sent to the video playback control unit of the video monitoring platform.
  • the processor 51 is configured to adjust a push speed of the video stream according to the receiving speed and the buffer value;
  • the transmitter 53 is configured to push a video stream to the client according to the pushing speed for the client to play.
  • the processor 51 may be a central processing unit CPU, or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.
  • the above technical solution uniformly controls the synchronization of multiple clients and multiple channels of video through the video playback control unit of the video monitoring platform, so that multiple sites and multiple clients can cooperate with each other, so that multiple observers can conveniently view the same from different clients.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device implementations described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the present embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software function unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, A medium that can store program code, such as a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

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  • Multimedia (AREA)
  • Signal Processing (AREA)
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Abstract

本发明公开了一种视频播放的控制方法、设备及系统,该方法包括:视频监控平台向观察组内的多个客户端分别推送时间段相同的一路或者多路视频流;接收所述多个客户端分别定期向视频监控平台的视频播放控制单元发送的该客户端的一路或者多路视频流接收速度和该路视频流的緩存值;视频监控平台的视频播放控制单元根据所述接收速度和緩存值调整该路视频流的推送速度;视频监控平台根据该推送速度向客户端推送视频流,供客户端播放。通过上述方法,本发明能够实现多客户端同步回放、协同调阅案发地多路摄像机的视频信息。通过多路视频同步回放,可以快速掌握案件关键信息,提高办案效率。

Description

视频播放的控制方法、 设备及系统
技术领域
本发明实施例涉及视频监控业务领域, 具体涉及一种视频播放的控制方 法、 设备及系统。 背景技术
近年来, 为了提高公共安全, 通常会部署视频监控系统对公共区域进行 监控录像。 对于一些重要场所, 如机场、 银行、 十字路口等, 会从多个方位 设置多个前端设备(通常是摄像头 )对同一个地点进行多角度监控, 进一步 提升安全性。 当出现异常情况时, 公安刑侦人员或其它安保人员为掌握案发 地某时间段的关键信息, 往往需要对多路录像进行同步回放和观察分析, 为 处理异常情况提供更多有价值线索。
现有技术是在同一客户端, 对多路视频进行同步回放。 将显示器的界面 划分成若干个窗口, 如 4个、 8个或更多, 多路视频分别在不同的窗口中展 现, 这就需要多人同时在一个地方注视一个显示器的不同窗口。 发明人发现 该方法存在以下缺点: (1 )显示器的界面划分的窗口越多, 每个窗口中的画 面越小, 甚至无法识别画面细节, 影响观察分析的准确度; (2 )由于显示器 的尺寸和分辨率受限, 无法实现更多人员的协同作战, 满足不了多人协同调 阅的需求(3 ) 当案情需要多地联合办案时候, 现有方案根本无法实现多地、 多人协同调阅视频的需求。 发明内容
本发明实施例的目的是提供一种能够在多个客户端同步回放多路监控 视频的视频播放的控制方法、 设备及系统。
第一方面, 提供一种视频播放的控制方法, 该方法包括:
视频监控平台向观察组内的多个客户端分别推送时间段相同的一路或 者多路视频流;
接收所述多个客户端分别定期向视频监控平台的视频播放控制单元发 送的该客户端的一路或者多路视频流接收速度和该路视频流的緩存值;
视频监控平台的视频播放控制单元根据接收到的视频流的所述接收速 度和緩存值调整该路视频流的推送速度;
视频监控平台根据该推送速度向客户端推送视频流, 供客户端播放。 结合第一方面, 在第一方面的第一种可能的实现方式中: 所述视频监控 平台向观察组内的多个客户端分别推送时间段相同的一路或者多路视频流 的步骤之前, 还包括: 视频监控平台为多个客户端创建观察组。
结合第一方面, 在第一方面的第二种可能的实现方式中: 所述根据所述 接收速度和緩存值调整该路视频流的推送速度的步骤具体为:
( a )当接收到的第 i路视频流在其所属客户端的緩存中的緩存值 (^为 0 时, 通知其他客户端停止播放, 停止推送所述第 i路视频流之外的其他视频 流, 并且,
若所述第 i路视频流所属客户端当前的播放速度为 n*Vp, 且所述第 i路 的视频流推送速度为 ¼ , 则调整推送该路视频流推送速度为:
V + C ÷ ΔΤ
以使得经过 ΔΤ时间后, 该路视频流的緩存值大于 Cmin
或 ( b ) 当第 i路回放当前视频流緩存值 0<(^<( 匪时:
设当前的播放速度为 n*Vp, 当前视频流推送速度为 ¼ , 调整视频监控 平台推送该路回放的视频流推送速度为:
Vi+[Cm-(Vi-n*Vp)*AT-Ci]/AT, 其中, Cm=(Cmin+Cmax)/2,
以使得经过 ΔΤ时间后, 该路视频流的緩存值大于 Cmin
或 ( C ) 当第 i路回放当前视频流緩存值 Cm^C^Cmax时:
判断当前的视频播放速度, 假设为 n倍速, 如果当前视频流推送速度 Vi = n*Vp, 保持当前推送速度; 如果 Vi≠n*Vp , 则调整为 n*Vp;
或 (d ) 当第 i路回放当前视频流緩存值0^<(^<(^。111时:
设当前的播放速度为 n*Vp, 当前视频流推送速度为 ¼, 调整视频监控 平台推送第 i路回放的视频流推送速度为:
Vi+[Cm-(Vi-n*Vp)*AT-Ci]/AT , 其中, Cm=(Cmin+Cmax)/2, 以使得经 过 ΔΤ时间后, 该路视频流的緩存值小于 Cmax
或 ( e ) 当第 i路回放当前视频流緩存值 d = Ctotai时:
暂停该路视频流的推送;
其中, Cttal为观察组内各客户端为每路回放分配的緩存区大小, Cmax为 警戒上限, Cmin为警戒下限, 且(^Cmi^Cma^Ctotal 。 结合第一方面, 在第一方面的第三种可能的实现方式中: 在客户端播放 过程中, 所述观察组的主席调整客户端播放速度, 则视频监控平台的视频播 放控制单元相应调整观察组内的其他客户端的视频流的播放速度。
第二方面, 提供一种视频播放控制单元, 包括: 视频流推送模块、 接收 模块以及推送速度调整模块, 其中:
视频流推送模块,用于向观察组内的多个客户端分别推送时间段相同的 一路或者多路视频流;
接收模块,用于接收所述多个客户端分别定期向视频监控平台的视频播 放控制单元发送的该客户端的一路或者多路视频流接收速度和该路视频流 的緩存值;
推送速度调整模块,用于根据所述接收速度和緩存值调整该路视频流的 推送速度;
其中,所述视频流推送模块进一步用于根据所述推送速度向客户端推送 视频流, 供客户端播放。
结合第二方面, 在第二方面的第一种可能的实现方式中: 还包括: 邀请消息发送模块, 用于向客户端发送邀请消息, 邀请客户端加入观察 组。
结合第二方面, 在第二方面的第二种可能的实现方式中:
在客户端播放过程中, 所述观察组的主席调整客户端播放速度, 则视频 监控平台的视频播放控制单元相应调整观察组内的其他客户端的视频流的 播放速度。
第三方面, 提供一种视频监控平台, 包括:
视频收发单元, 用于接收前端设备发送的视频流;
视频存储单元, 用于存储所述视频收发单元接收的视频流;
视频播放控制单元,该视频播放控制单元进一步包括:视频流推送模块, 用于向观察组内的多个客户端分别推送时间段相同的一路或者多路视频流; 接收模块, 用于接收所述多个客户端分别定期向视频监控平台的视频播放控 制单元发送的该客户端的一路或者多路视频流接收速度和该路视频流的緩 存值; 推送速度调整模块, 用于根据所述接收速度和緩存值调整该路视频流 的推送速度; 其中, 所述视频流推送模块进一步用于根据所述推送速度向客 户端推送视频流, 供客户端播放。 结合第三方面, 在第三方面的第一种可能的实现方式中: 所述视频播放 控制单元还包括: 邀请消息发送模块, 用于向客户端发送邀请消息, 邀请客 户端加入观察组。
结合第三方面, 在第三方面的第二种可能的实现方式中: 在客户端播放 过程中, 所述观察组的主席调整客户端播放速度, 则视频监控平台的视频播 放控制单元相应调整观察组内的其他客户端的视频流的播放速度。
第四方面, 提供一种视频监控系统, 包括:
前端设备, 用于拍摄视频, 并将视频传送给视频监控平台;
客户端设备, 用于接收视频监控平台推送的视频流并播放;
视频监控平台, 该视频监控平台包括:
视频收发单元, 用于接收前端设备发送的视频流;
视频存储单元, 用于存储所述视频收发单元接收的视频流;
其特征在于, 该视频监控平台还包括:
视频播放控制单元,该视频播放控制单元进一步包括:视频流推送模块, 用于向观察组内的多个客户端分别推送时间段相同的一路或者多路视频流; 接收模块, 用于接收所述多个客户端分别定期向视频监控平台的视频播放控 制单元发送的该客户端的一路或者多路视频流接收速度和该路视频流的緩 存值; 推送速度调整模块, 用于根据所述接收速度和緩存值调整该路视频流 的推送速度; 其中, 所述视频流推送模块进一步用于根据所述推送速度向客 户端推送视频流, 供客户端播放。
结合第四方面, 在第四方面的第一种可能的实现方式中: 所述视频播放 控制单元还包括: 邀请消息发送模块, 用于向客户端发送邀请消息, 邀请客 户端加入观察组。
结合第四方面, 在第四方面的第二种可能的实现方式中: 所述视频播放 控制单元还包括: 视频流推送速度调整模块, 用于在视频监控平台以初始速 度 V0向观察组内各成员推送视频流的播放过程中, 如果主席调整了客户端 播放速度, 如调整为 1/2倍、 4倍 Vp等, 则视频监控平台的视频播放控制单 元相应调整观察组内的其他客户端的视频流播放速度。
本发明的有益效果是: 通过视频监控平台的视频播放控制单元统一控制 多客户端、 多路视频的同步播放, 使得多地、 多客户端可以互相协同, 以便 多个观察者能够方便地从不同客户端观看同一时段的多路视频; 从而实现多 客户端同步回放、 协同调阅案发地多路摄像头的视频信息, 快速掌握案件关 键信息, 提高办案效率。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对本发明实施例中 所需要使用的附图作筒单地介绍, 显而易见地, 下面所描述的附图仅仅是本 发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的 前提下, 还可以根据这些附图获得其他的附图。
图 1是本发明实施例的视频监控系统的架构示意图;
图 2是本发明实施例的视频播放控制单元的组成示意图;
图 3是本发明实施例的视频播放控制方法的流程图;
图 4a-4b是本发明实施例的客户端界面示意图;
图 5是本发明的第一实施例的流程图;
图 6是本发明的第二实施例的流程图;
图 7是本发明的第三实施例的流程图;
图 8是本发明的第四实施例的流程图;
图 9是本发明的第五实施例的流程图;
图 10是本发明的第六实施例的流程图;
图 11是本发明的第七实施例的流程图;
图 12是本发明的第八实施例的流程图;
图 13是本发明的视频监控平台又一个实施方式的架构示意图。
具体实施方式
参阅图 1 , 图 1为本发明实施例的视频监控系统的架构示意图, 视频监 控系统包括客户端 10、 视频监控平台 20以及前端设备 30。
其中, 客户端 10是承载客户端功能的具体实体设备或虚拟设备, 通常 有多个,主要实现监控人员查看监控视频功能。客户端 10可以为 PC客户端 或移动客户端, 如手机、 pad、 MediaPad等移动设备。
视频监控平台 20通过有线网络如同轴线缆、 光纤等, 或无线网络如蓝 牙、 红外、 WIFI、 GPRS, LTE等, 与客户端 10以及前端设备 30实现通信。 视频监控平台 20通常包括: 视频收发单元 22, 用于接收前端设备发送的视 频流; 视频存储单元 24, 用于存储所述视频收发单元 22接收的视频流; 视 频播放控制单元 26, 用于对推送到客户端 10的视频流进行控制。
根据应用场景的不同,视频播放控制单元 26, 可以是单独设置于视频监 控系统中的实体设备,也可以作为一个功能单元集成于现有视频监控平台 20 中, 也可以根据需要集成在客户端 10上, 本发明实施例以集成于现有视频 监控平台 20中进行说明。
请结合参照图 2, 为本发明实施例的视频播放控制单元 26 的组成示意 图, 该视频播放控制单元 26包括:
视频流推送模块 261 , 用于向观察组内的多个客户端分别推送时间段相 同的一路或者多路视频流; 接收模块 262, 用于接收所述多个客户端分别定 期向视频监控平台的视频播放控制单元发送的该客户端的一路或者多路视 频流接收速度和该路视频流的緩存值; 推送速度调整模块 263 , 用于根据所 述接收速度和緩存值调整该路视频流的推送速度; 其中, 所述视频流推送模 块 261进一步用于根据所述推送速度向客户端 10推送视频流, 供客户端 10 播放。
请参照图 3 , 图 3为本发明实施例的视频播放控制方法的流程图, 该方 法包括以下步骤:
S102,视频监控平台向观察组内的多个客户端分别推送时间段相同的一 路或者多路视频流;
S104,接收所述多个客户端分别定期向视频监控平台的视频播放控制单 元发送的该客户端的一路或者多路视频流接收速度和该路视频流的緩存值;
S106,视频监控平台的视频播放控制单元根据接收到的视频流的所述接 收速度和緩存值调整该路视频流的推送速度; 步骤 S106具体为:
( a )当接收到的第 i路视频流在其所属客户端的緩存中的緩存值 (^为 0 时, 通知其他客户端停止播放, 停止推送所述第 i路视频流之外的其他视频 流, 并且,
若所述第 i路视频流所属客户端当前的播放速度为 n*Vp, 且所述第 i路 的视频流推送速度为 ¼ , 则调整推送该路视频流推送速度为:
V + C ÷ ΔΤ
以使得经过 ΔΤ时间后, 该路视频流的緩存值大于 Cmin;
或 ( b ) 当第 i路回放当前视频流緩存值 0<(^<( 匪时: 设当前的播放速度为 n*Vp, 当前视频流推送速度为 ¼ , 调整视频监控 平台推送该路回放的视频流推送速度为:
Vi+[Cm-(Vi-n*Vp)*AT-Ci]/AT, 其中, Cm=(Cmin+Cmax)/2,
以使得经过 ΔΤ时间后, 该路视频流的緩存值大于 Cmin
或 ( c ) 当第 i路回放当前视频流緩存值 C <d<Cmax时:
判断当前的视频播放速度, 假设为 n倍速, 如果当前视频流推送速度 Vi = n*Vp, 保持当前推送速度; 如果 Vi≠n*Vp , 则调整为 n*Vp;
或 (d ) 当第 i路回放当前视频流緩存值0^<(^<(^。111时:
设当前的播放速度为 n*Vp, 当前视频流推送速度为 ¼, 调整视频监控 平台推送第 i路回放的视频流推送速度为:
Vi+[Cm-(Vi-n*Vp)*AT-Ci]/AT , 其中, Cm=(Cmin+Cmax)/2, 以使得经 过 ΔΤ时间后, 该路视频流的緩存值小于 Cmax
或 ( e ) 当第 i路回放当前视频流緩存值 d = Ctotai时:
暂停该路视频流的推送;
其中, Cttal为观察组内各客户端为每路回放分配的緩存区大小, Q为第 i路回放的当前緩存值大小标志, cmax为警戒上限, cmin为警戒下限, 且
0<Cmin<Cmax<Ctotai, Δ Τ通常是毫秒级的, 例如 10毫秒 -200毫秒的范围, 可 以根据系统性能和要求选择确定, n可以是自然数, 也可以是分数, 如 1/4 1/2 2 4等 。
同步回放经过一设定时间后,各客户端向视频播放控制单元反馈该客户 端中每路回放的当前视频流緩存值大小, 此后, 每经过一 ΔΤ时间, 发起一 次反馈。 视频播放控制单元根据收到的反馈信息, 通知视频监控平台对各路 视频流的推送速度进行调整, 以实现同步控制。
S108, 视频监控平台根据该推送速度向客户端推送视频流, 供客户端播 放。
在播放过程中 观察组内所有成员有相同的时间轴, 且时间轴行进基本 一致。 管理员可以对视频进行重分配, 以协同分析某些重点视频。 同步播放 过程中, 观察组内成员也可以选择进行即时的文字或语音交流。
可选的, 在步骤 S102之前, 还包括:
步骤 S101 , 视频监控平台为多个客户端创建观察组, 具体为: 用户在登录客户端后, 可以选取在线客户端, 选取客户端的界面如图 4a 所示。
也可以通过客户端 IP地址邀请特定客户端加入观察组, 如图 5所示, 当采用由视频监控平台创建观察组的方式时: 由某客户端发起创建观察组的 请求, 视频监控平台在收到观察组创建请求后, 获取客户端列表, 并反馈列 表中客户端的媒体能力 (带宽、 CPU、 内存、 解码能力等), 创建者客户端 1 根据视视频监控平台反馈的客户端列表及客户端媒体能力选中客户端加入 观察组。 被邀请的客户端在收到视频监控平台的消息后, 可以选择是否接受 邀请。 如果选择接受邀请, 则加入观察组如果拒绝邀请或长时间未处理邀请 信息, 则按拒绝加入观察组处理。 为了进一步提升用户的体验, 视频监控平 台可以向申请创建观察组的客户端 1反馈创建结果,如多少客户端加入观察 组, 多少客户端未加入观察组等信息, 客户端的界面如图 4b所示。
另外, 在同步播放过程中, 主席可以定时获取观察组内各成员的媒体能 力 (带宽、 CPU、 内存、 解码能力), 如果发现某客户端的媒体能力下降严 重, 则可以采取减少该客户端点播的视频路数或者剔除该客户端, 因此产生 的多余视频路数, 由主席托管, 并可被主席重新分配给其它观察者。
如图 6所示,也可以通过用户在客户端向局域网内广播创建观察组的消 息, 局域网内收到消息的其它客户端则可以选择加入观察组。
如图 7所示,也可以通过用户在客户端向视频监控平台发送创建观察组 的请求消息, 视频监控平台向所有客户端发送消息, 其它客户端收到视频监 控平台的消息后, 可以选择加入观察组。
观察组的权限控制方式具体为:
管理员具备添加、 删除观察组内的成员, 选取一路或者多路待观察的视 频, 并将选取的待观察视频分配给每位成员;
主席具有控制观察组内所有同步播放的视频进行统一的播放的权限; 从观察者具有控制本客户端视频的播放的权限。
可选的, 所述步骤 S108之后, 还包括步骤 S109, 如图 8所示: 视频监 控平台以初始速度 V0向观察组内各成员推送视频流, 在客户端播放过程中, 所述观察组的主席调整客户端播放速度, 如调整为 1/2倍、 4倍 Vp等, 则视 频监控平台的视频播放控制单元相应调整观察组内的其他客户端的视频流 的播放速度
另外, 可选的, 观察组内每个成员可以设置同步播放过程中的跟随策略 为 "播放优先" 或者 "同步优先"。
"同步优先" 策略具体为: 如图 9所示, 当主席选择对观察组内所有视 频统一进行暂停操作后, 所有成员的视频播放暂停, 并收到消息通知 "某主 席对某路视频进行了暂停操作", 此时只有主席可以恢复视频同步播放, 其 它成员无法操作。 如图 10所示, 当有从观察者 1进行暂停操作后, 其它从 观察者的视频播放暂停, 并收到消息通知 "某成员对某路视频进行了暂停操 作", 此时只有主席和进行了暂停操作的从观察者 1可以恢复视频同步播放, 其它成员无法操作。
"播放优先"策略具体为: 如图 11所示, 当主席选择对观察组内所有视 频统一进行暂停操作后, 视频监控平台通知观察组所有成员的视频播放暂 停, 并向观察组所有成员发送暂停信息提示: "某主席对某路视频进行了暂 停操作", 此时只有主席可以恢复视频同步播放, 其它成员无法操作。 如图
12所示,从观察者 1选择对本客户端的视频进行暂停操作后,其它从观察者 收到消息通知 "某成员对某路视频进行了暂停操作", 但是其它从观察者的 视频播放不做暂停处理。进行了暂停操作的从观察者 1在恢复播放所暂停的 某路视频时, 可以选择直接跳转至同步播放的当前时间点, 也可以选择以 2 倍或 4倍速快进至同步播放的当前时间点。
请参阅图 13 , 图 13为本发明的视频监控平台又一个实施方式的结构示 意图, 视频监控平台 20包括处理器 51、 接收器 52、 发送器 53、 随机存取存 储器 54、 只读存储器 55、 总线 56以及网络接口单元 57。 其中, 处理器 51 通过总线 56分别耦接接收器 52、发送器 53、 随机存取存储器 54、 只读存储 器 55以及网络接口单元 57。 其中, 当需要运行视频监控平台时, 通过固化 在只读存储器 55中的基本输入输出系统或者嵌入式系统中的 bootloader引导 系统进行启动, 引导视频监控平台进入正常运行状态。 在视频监控平台进入 正常运行状态后, 在随机存取存储器 54 中运行应用程序和操作系统, 从网 络接收数据或者向网络发送数据, 使得:
接收器 52,用于接收所述多个客户端分别定期向视频监控平台的视频播 放控制单元发送的该客户端的一路或者多路视频流接收速度和该路视频流 的緩存值;
处理器 51 , 用于根据所述接收速度和緩存值调整该路视频流的推送速 度; 发送器 53 ,用于根据所述推送速度向客户端推送视频流,供客户端播放。 本实施方式中, 处理器 51可能是一个中央处理器 CPU, 或者是特定集 成电路 ASIC ( Application Specific Integrated Circuit ), 或者是被配置成实施 本申请实施方式的一个或多个集成电路。
上述技术方案,通过视频监控平台的视频播放控制单元统一控制多客户 端、 多路视频的同步, 使得多地、 多客户端可以互相协同, 以便多个观察者 能够方便地从不同客户端观看同一时段的多路视频; 实现多客户端同步回 放、 协同调阅案发地多路摄像机的视频信息, 快速掌握案件关键信息, 提高 办案效率。
在本申请所提供的几个实施方式中, 应该理解到, 所揭露的系统, 装置 和方法, 可以通过其它的方式实现。 例如, 以上所描述的装置实施方式仅仅 是示意性的, 例如, 所述模块或单元的划分, 仅仅为一种逻辑功能划分, 实 际实现时可以有另外的划分方式, 例如多个单元或组件可以结合或者可以集 成到另一个系统, 或一些特征可以忽略, 或不执行。 另一点, 所显示或讨论 的相互之间的耦合或直接耦合或通信连接可以是通过一些接口, 装置或单元 的间接耦合或通信连接, 可以是电性, 机械或其它的形式。 为单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或 者全部单元来实现本实施方式方案的目的。
另外,在本申请各个实施方式中的各功能单元可以集成在一个处理单元 中, 也可以是各个单元单独物理存在, 也可以两个或两个以上单元集成在一 个单元中。 上述集成的单元既可以采用硬件的形式实现, 也可以采用软件功 能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销 售或使用时, 可以存储在一个计算机可读取存储介质中。 基于这样的理解, 本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方 案的全部或部分可以以软件产品的形式体现出来, 该计算机软件产品存储在 一个存储介质中, 包括若干指令用以使得一台计算机设备(可以是个人计算 机, 服务器, 或者网络设备等)或处理器(processor )执行本申请各个实施 方式所述方法的全部或部分步骤。 而前述的存储介质包括: U盘、移动硬盘、 只读存储器(ROM, Read-Only Memory )、 随机存取存储器(RAM, Random Access Memory )、 磁碟或者光盘等各种可以存储程序代码的介质。
以上所述仅为本申请的实施方式, 并非因此限制本申请的专利范围, 凡 是利用本申请说明书及附图内容所作的等效结构或等效流程变换,或直接或 间接运用在其他相关的技术领域, 均同理包括在本申请的专利保护范围内。

Claims

权利要求
1、 一种视频播放的控制方法, 其特征在于, 包括:
视频监控平台向观察组内的多个客户端分别推送时间段相同的一路或 者多路视频流;
接收所述多个客户端分别定期向视频监控平台的视频播放控制单元发 送的该客户端的一路或者多路视频流接收速度和该路视频流的緩存值;
视频监控平台的视频播放控制单元根据接收到的视频流的所述接收速 度和緩存值调整该路视频流的推送速度;
视频监控平台根据该推送速度向客户端推送视频流, 供客户端播放。
2、 根据权利要求 1所述的方法, 其特征在于:
所述根据接收到的视频流的所述接收速度和緩存值调整该路视频流的 推送速度的步骤具体为:
( a )当接收到的第 i路视频流在其所属客户端的緩存中的緩存值 (^为 0 时, 通知其他客户端停止播放, 停止推送所述第 i路视频流之外的其他视频 流, 并且,
若所述第 i路视频流所属客户端当前的播放速度为 n*Vp, 且所述第 i路 的视频流推送速度为 ¼ , 则调整推送该路视频流推送速度为:
V + C ÷ ΔΤ
以使得经过 ΔΤ时间后, 该路视频流的緩存值大于 Cmin
或 ( b ) 当第 i路回放当前视频流緩存值 0<Ci<Cmin时:
设当前的播放速度为 n*Vp, 当前视频流推送速度为 ¼ , 调整视频监控 平台推送该路回放的视频流推送速度为:
Vi+[Cm-(Vi-n*Vp)*AT-Ci]/AT, 其中, Cm=(Cmin+Cmax)/2,
以使得经过 ΔΤ时间后, 该路视频流的緩存值大于 Cmin
或 ( c ) 当第 i路回放当前视频流緩存值 C <d<Cmax时:
判断当前的视频播放速度, 假设为 n倍速, 如果当前视频流推送速度 Vi = n*Vp, 保持当前推送速度; 如果 Vi≠n*Vp , 则调整为 n*Vp;
或 (d ) 当第 i路回放当前视频流緩存值0^<(^<(^。111时:
设当前的播放速度为 n*Vp, 当前视频流推送速度为 ¼, 调整视频监控 平台推送第 i路回放的视频流推送速度为:
Vi+[Cm-(Vi-n*Vp)*AT-Ci]/AT , 其中, Cm=(Cmin+Cmax)/2, 以使得经 过 ΔΤ时间后, 该路视频流的緩存值小于 Cmax
或 ( e ) 当第 i路回放当前视频流緩存值 d = Ctotai时:
暂停该路视频流的推送;
其中, Cttal为观察组内各客户端为每路回放分配的緩存区大小, Cmax为 警戒上限, Cmin为警戒下限, 且( Cmi^Cma^Ctotal 。
3、 根据权利要求 1所述的方法, 其特征在于:
所述视频监控平台根据该推送速度向客户端推送视频流,供客户端播放 的步骤之后, 还包括:
在客户端播放过程中, 所述观察组的主席调整客户端播放速度, 则视频 监控平台的视频播放控制单元相应调整观察组内的其他客户端的视频流的 播放速度。
4、 根据权利要求 1所述的方法, 其特征在于:
所述视频监控平台向观察组内的多个客户端分别推送时间段相同的一 路或者多路视频流的步骤之前, 还包括: 视频监控平台的视频播放控制单元 为多个客户端创建观察组。
5、 根据权利要求 4所述的方法, 其特征在于:
创建观察组的发起者为管理员,管理员选择观察组内的一个成员作为一 个主席, 其余成员为从观察者, 其中:
管理员具备添加、 删除观察组内的成员, 选取一路或者多路待观察的视 频, 并将选取的待观察视频分配给每位成员;
主席具有控制观察组内所有同步播放的视频进行统一的播放的权限; 从观察者具有控制本客户端视频的播放的权限。
6、 根据权利要求 4所述的方法, 其特征在于:
观察组内每个成员可以设置同步播放过程中的跟随策略为 "播放优先" 或者 "同步优先"。
7、 一种视频播放控制单元, 其特征在于, 包括: 视频流推送模块、 接 收模块以及推送速度调整模块, 其中:
视频流推送模块,用于向观察组内的多个客户端分别推送时间段相同的 一路或者多路视频流;
接收模块,用于接收所述多个客户端分别定期向视频监控平台的视频播 放控制单元发送的该客户端的一路或者多路视频流接收速度和该路视频流 的緩存值;
推送速度调整模块,用于根据所述接收速度和緩存值调整该路视频流的 推送速度;
其中,所述视频流推送模块进一步用于根据所述推送速度向客户端推送 视频流, 供客户端播放。
8、 根据权利要求 7所述的视频播放控制单元, 其特征在于:
所述根据所述接收到的视频流的接收速度和緩存值调整该路视频流的 推送速度具体为:
( a )当接收到的第 i路视频流在其所属客户端的緩存中的緩存值 (^为 0 时, 通知其他客户端停止播放, 停止推送所述第 i路视频流之外的其他视频 流, 并且,
若所述第 i路视频流所属客户端当前的播放速度为 n*Vp, 且所述第 i路 的视频流推送速度为 ¼ , 则调整推送该路视频流推送速度为:
V + C ÷ ΔΤ
以使得经过 ΔΤ时间后, 该路视频流的緩存值大于 Cmin
或 ( b ) 当第 i路回放当前视频流緩存值 0<(^<( 匪时:
设当前的播放速度为 n*Vp, 当前视频流推送速度为 ¼ , 调整视频监控 平台推送该路回放的视频流推送速度为:
Vi+[Cm-(Vi-n*Vp)*AT-Ci]/AT, 其中, Cm=(Cmin+Cmax)/2,
以使得经过 ΔΤ时间后, 该路视频流的緩存值大于 Cmin;
或 (C ) 当第 i路回放当前视频流緩存值 Cn^^C^Cmax时:
判断当前的视频播放速度, 假设为 n倍速, 如果当前视频流推送速度 Vi = n*Vp, 保持当前推送速度; 如果 Vi≠n*Vp , 则调整为 n*Vp;
或 (d ) 当第 i路回放当前视频流緩存值0^<(^<(^。111时:
设当前的播放速度为 n*Vp, 当前视频流推送速度为 Vi, 调整视频监控 平台推送第 i路回放的视频流推送速度为:
Vi+[Cm-(Vi-n*Vp)*AT-Ci]/AT , 其中, Cm=(Cmin+Cmax)/2, 以使得经 过 ΔΤ时间后, 该路视频流的緩存值小于 Cmax
或 ( e ) 当第 i路回放当前视频流緩存值 d = Ctotai时:
暂停该路视频流的推送;
其中, cttal为观察组内各客户端为每路回放分配的緩存区大小, cmax为 警戒上限, Cmin为警戒下限, 且( Cmi^Cma^Ctotal 。
9、 根据权利要求 7所述的视频播放控制单元, 其特征在于, 还包括: 邀请消息发送模块, 用于向客户端发送邀请消息, 邀请客户端加入观察 组。
10、 根据权利要求 7所述的视频播放控制单元, 其特征在于: 在客户端播放过程中, 所述观察组的主席调整客户端播放速度, 则视频 监控平台的视频播放控制单元相应调整观察组内的其他客户端的视频流的 播放速度。
11、 一种视频监控平台, 其特征在于, 包括:
视频收发单元, 用于接收前端设备发送的视频流;
视频存储单元, 用于存储所述视频收发单元接收的视频流;
视频播放控制单元, 该视频播放控制单元进一步包括:
视频流推送模块,用于向观察组内的多个客户端分别推送时间段相同的 一路或者多路视频流; 接收模块, 用于接收所述多个客户端分别定期向视频 监控平台的视频播放控制单元发送的该客户端的一路或者多路视频流接收 速度和该路视频流的緩存值; 推送速度调整模块, 用于根据所述接收速度和 緩存值调整该路视频流的推送速度; 其中, 所述视频流推送模块进一步用于 根据所述推送速度向客户端推送视频流, 供客户端播放。
12、 根据权利要求 11所述的视频监控平台, 其特征在于:
所述视频播放控制单元还包括: 邀请消息发送模块, 用于向客户端发送 邀请消息, 邀请客户端加入观察组。
13、 根据权利要求 11所述的视频监控平台, 其特征在于:
在客户端播放过程中, 所述观察组的主席调整客户端播放速度, 则视频 监控平台的视频播放控制单元相应调整观察组内的其他客户端的视频流的 播放速度。
14、 一种视频监控系统, 包括:
前端设备, 用于拍摄视频, 并将视频传送给视频监控平台;
客户端设备, 用于接收视频监控平台推送的视频流并播放;
视频监控平台, 该视频监控平台具体包括:
视频收发单元, 用于接收前端设备发送的视频流;
视频存储单元, 用于存储所述视频收发单元接收的视频流; 其特征在于, 该视频监控平台还包括:
视频播放控制单元,该视频播放控制单元进一步包括:视频流推送模块, 用于向观察组内的多个客户端分别推送时间段相同的一路或者多路视频流; 接收模块, 用于接收所述多个客户端分别定期向视频监控平台的视频播放控 制单元发送的该客户端的一路或者多路视频流接收速度和该路视频流的緩 存值; 推送速度调整模块, 用于根据所述接收速度和緩存值调整该路视频流 的推送速度; 其中, 所述视频流推送模块进一步用于根据所述推送速度向客 户端推送视频流, 供客户端播放。
15、 根据权利要求 14所述的视频监控系统, 其特征在于:
所述视频播放控制单元还包括: 邀请消息发送模块, 用于向客户端发送 邀请消息, 邀请客户端加入观察组。
16、 根据权利要求 14所述的视频监控系统, 其特征在于:
在客户端播放过程中, 所述观察组的主席调整客户端播放速度, 则视频 监控平台的视频播放控制单元相应调整观察组内的其他客户端的视频流的 播放速度。
PCT/CN2013/079003 2013-07-08 2013-07-08 视频播放的控制方法、设备及系统 WO2015003302A1 (zh)

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CN104782169B (zh) 2019-06-28
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