WO2019139184A1 - Système et procédé de synchronisation de groupes de diffusion en continu multimédia dans un réseau de diffusion en continu hiérarchique - Google Patents

Système et procédé de synchronisation de groupes de diffusion en continu multimédia dans un réseau de diffusion en continu hiérarchique Download PDF

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Publication number
WO2019139184A1
WO2019139184A1 PCT/KR2018/000487 KR2018000487W WO2019139184A1 WO 2019139184 A1 WO2019139184 A1 WO 2019139184A1 KR 2018000487 W KR2018000487 W KR 2018000487W WO 2019139184 A1 WO2019139184 A1 WO 2019139184A1
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WIPO (PCT)
Prior art keywords
event
client device
synchronization
media
streaming
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PCT/KR2018/000487
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English (en)
Korean (ko)
Inventor
주홍택
김현우
권동우
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계명대학교 산학협력단
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Publication of WO2019139184A1 publication Critical patent/WO2019139184A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing 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
    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing 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
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47217—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for controlling playback functions for recorded or on-demand content, e.g. using progress bars, mode or play-point indicators or bookmarks

Definitions

  • the present invention relates to a synchronization system and method, and more particularly, to a system and method for synchronizing media streaming groups in a hierarchical streaming network.
  • a hierarchical streaming network in which a media source device acting as a media server performs media streaming to at least one or more other client devices, the method comprising: sharing a playback location of the media source device with client devices to reproduce the same media location, This is called group synchronization in a streaming network.
  • the present invention has been proposed in order to solve the above-mentioned problems of the previously proposed methods, and it is an object of the present invention to provide a method and apparatus for controlling a performance of a hardware and a process running in the background, A control section that calculates a difference between a reproduction position and an actual reproduction position locally expected at a current time and corrects the reproduction position with respect to a control error generated locally so as to minimize the transmission of the synchronization control packet while maintaining high synchronization accuracy, It is an object of the present invention to provide a system and method for synchronizing a media streaming group in a streaming network.
  • the present invention is not only to recalibrate the error occurring in the local reproduction position correction by performing synchronization in a rare but periodic manner even in a situation in which no reproduction event occurs, i.e., even in a situation in which event-based synchronization is not applied,
  • the present invention is directed to a system and method for synchronizing media streaming groups in a hierarchical streaming network capable of performing location correction against a loss event of a synchronization control packet for a moving event of a media streaming group.
  • a media streaming group synchronization system in a hierarchical streaming network there is provided a media streaming group synchronization system in a hierarchical streaming network
  • a synchronization control packet 10 including a type of an event, a time of occurrence of an event, and a playback position of a streaming media to the client device (200) );
  • At least one client device for reproducing the streaming media by synchronizing a reproduction state according to a type of an event using the synchronization control packet (10) received from the media source device (100) (200)
  • the at least one client device (200) is the at least one client device.
  • the type of the event includes:
  • said at least one client device (200) is a smartphone.
  • the reproduction control unit 10 refers to the reproduction position of the streaming media of the received synchronization control packet 10, It is necessary to wait until the buffering is completed. After completion of the buffering, the time elapsed from the time of occurrence of the event to correct the buffering time and the transmission time of the synchronization control packet (10) The time can be calculated to correct the playback position and start playback.
  • said at least one client device (200) is a smartphone.
  • the reproduction position can be corrected by the following equation.
  • P e is an event-based synchronization correction position
  • P s is a playback position of the media source device
  • T c is a buffering completion time
  • T s is an event generation time
  • T o is a NTP Respectively.
  • said at least one client device (200) is a smartphone.
  • the local reproduction position error correction can be performed by correcting the position by calculating the difference between the currently expected reproduction position and the actual reproduction position locally.
  • the at least one client device (200) More preferably, the at least one client device (200)
  • the local reproduction position error occurring after the last time of synchronizing the reproduction state according to the type of the event can be corrected using the synchronization control packet 10 received from the media source device 100.
  • said at least one client device (200) is a smartphone.
  • the local reproduction position error can be corrected by the following equation.
  • P l is the expected play position in the current time
  • P e is the last event-based synchronization correction
  • T l is the current time
  • T e represents the last event in each time based on the synchronization correction
  • the media source device (100) Preferably, the media source device (100)
  • the synchronization control packet (10) More preferably, the synchronization control packet (10)
  • the media source device 100 transmits to the client device 200 a synchronization control packet 10 including the type of event, the time of occurrence of the event, and the playback position of the streaming media, with respect to the generated event step;
  • the at least one client device 200 synchronizes the reproduction state according to the type of the event using the synchronization control packet 10 received from the media source device 100 in the step (1) , ≪ / RTI &
  • the at least one client device 200 further performs local playback position error correction at predetermined intervals.
  • the type of the event includes:
  • the at least one client device (200) can correct the reproduction position by the following equation.
  • P e is an event-based synchronization correction position
  • P s is a playback position of the media source device
  • T c is a buffering completion time
  • T s is an event generation time
  • T o is a NTP Respectively.
  • the at least one client device 200 may perform regional playback position error correction by correcting the position by calculating the difference between the currently expected playback position and the actual playback position.
  • step (3) More preferably, in the step (3)
  • the at least one client device 200 may use the synchronization control packet 10 received from the media source device 100 to generate a local playback position error that occurs after the last time of synchronizing the playback state, Lt; / RTI >
  • the at least one client device 200 may correct the local playback position error by the following equation.
  • P l is the expected play position in the current time
  • P e is the last event-based synchronization correction
  • T l is the current time
  • T e represents the last event in each time based on the synchronization correction
  • the media source device 100 transmits the synchronization control packet 10 to the client device 200 at a predetermined period in a situation in which no playback event occurs, thereby adding the playback position of the client device 200 And a step of correcting the correction value.
  • the synchronization control packet (10) More preferably, the synchronization control packet (10)
  • synchronization is performed rarely but periodically even in a situation in which no playback event occurs, i.e., even in a situation in which event-based synchronization is not applied, so as to not only recalibrate the error occurring in the local playback position correction, It is possible to perform the position correction for the movement event of the position against the loss of the synchronization control packet.
  • FIG. 1 illustrates a configuration of a media streaming group synchronization system in a hierarchical streaming network according to an embodiment of the present invention
  • Figure 2 illustrates the format of a synchronization control packet (10) used in a media streaming group synchronization system in a hierarchical streaming network according to an embodiment of the present invention.
  • FIG. 3 is a diagram for explaining an event-based synchronization process in a media streaming group synchronization system in a hierarchical streaming network according to an embodiment of the present invention.
  • FIG. 4 is a diagram for explaining a process of local playback position error correction in a media streaming group synchronization system in a hierarchical streaming network according to an embodiment of the present invention
  • FIG. 5 is a diagram for explaining a rare periodic synchronization process in a media streaming group synchronization system in a hierarchical streaming network according to an embodiment of the present invention
  • FIG. 6 is a flow diagram illustrating a method for synchronizing media streaming groups in a hierarchical streaming network according to an embodiment of the present invention.
  • Figure 7 is a flow diagram further comprising a rare periodic synchronization step in a method of synchronizing media streaming groups in a hierarchical streaming network according to an embodiment of the present invention.
  • S100 transmitting, to the at least one client device, a synchronization control packet including a type of an event, an occurrence time of the event, and a playback position of the streaming media, with respect to the generated event
  • At least one client device synchronizes the reproduction state according to the kind of event using the synchronization control packet received from the media source device in step S100
  • At least one client device performs further local playback position error correction at predetermined intervals
  • the media source device transmits a synchronization control packet to the client device at a predetermined period in a situation where no playback event occurs, and further corrects the playback position of the client device
  • a media streaming group synchronization system in a hierarchical streaming network may include a media source device 100 and a client device 200.
  • the media source device 100 transmits the synchronization control packet 10 to at least one or more client devices 200
  • the client device 200 synchronizes the playback position using the synchronization control packet 10 To play streaming media.
  • a plurality of client devices 200 can reproduce the same streaming media at the same position at the same time.
  • the media source device 100 plays a role of a media server and transmits a synchronization control packet 10 including a type of an event, a time of occurrence of an event, and a playback position of a streaming media to the client device 200, Lt; / RTI >
  • the synchronization control packet 10 is a packet including synchronization control information, and is a packet exchanged between the media source device 100 and the client device 200.
  • a synchronization control packet 10 of a media streaming group synchronization system in a hierarchical streaming network includes a Play status field, a Device time field, ) Field, a Play position field, and an Extra field.
  • the playback status field indicates a playback status of the current server and a request status of a streaming client to participate in group synchronization. As shown in FIG. 2, the value of the playback status field includes "JOIN”, “JOIN_ACK”, “PLAY”, “SEEK”, “PAUSE”, “RESUME”, “STOP”, and “UPDATE” Is possible.
  • the Extra field includes a device ID, a media size, a media duration, a local playback adjustment interval, An interval (Periodic sync. Interval), and a current device height (MDT level) in the media distribution tree.
  • PLAY”, “SEEK”, “PAUSE”, “RESUME”, and “STOP” indicate the playback start, playback position shift, pause, restart, and stop event of the media source device, respectively.
  • UPDATE is used when the media source device updates the media buffering status to the client device connected to the media source device. The client device updates the buffer fragmented stream fragment state to inform that the stream fragment request is possible.
  • the device time field stores the time when the event occurred.
  • the Play Position field the playback position at the time when the event occurs is stored, and the unit is milliseconds (ms).
  • the client device 200 can reproduce the streaming media by reproducing the streaming media in a streaming manner and synchronize the reproduction state according to the type of the event using the synchronization control packet 10 received from the media source device 100 .
  • the client device 200 can perform local playback position error correction at predetermined intervals, thereby minimizing the transmission of the synchronization control packet 10 while maintaining high synchronization accuracy. Local playback position error correction will be described in detail later.
  • the client device 200 may be at least one.
  • the types of events may include 'start playback', 'pause', 'restart', 'stop', 'move playback position' as shown in FIG. no.
  • the client devices 200 refers to the reproduction position of the streaming media of the received synchronization control packet 10 If buffering is not completed, the streaming data is requested and waited until the buffering is completed. If buffering is completed, the buffering time and the transmission time of the synchronization control packet 10 In order to correct the time, the elapsed time from the event occurrence time may be calculated to correct the playback position and start playback.
  • the media source device 100 and the client device 200 first perform event-based synchronization.
  • the event-driven synchronization means that when an event such as "start playback”, “pause”, “restart”, “stop”, “move playback position” occurs in the media source device 100
  • the media source device 100 transmits the synchronization control packet 10 to the media client devices 200 by transmitting the time and event type of the event and the playback position to the media client devices 200,
  • the devices 200 means to synchronize the reproduction state according to the kind of the event.
  • FIG. 3 is a diagram for explaining an event-based synchronization process in a media streaming group synchronization system in a hierarchical streaming network according to an embodiment of the present invention.
  • the reproduction position of the media player is searched for and moved by referring to the reproduction position of the synchronization control packet 10.
  • the playback position does not complete buffering, it requests stream data and waits until buffering is completed.
  • the elapsed time from the time when the event occurs to correct the time required for buffering and the transmission time of the synchronization control packet 10 is calculated to correct the playback position and start playback.
  • the following equation (1) represents a reproduction position correction formula for event-based synchronization.
  • P e is an event-based synchronization correction position
  • P s is a playback position of the media source device
  • T c is a buffering completion time
  • T s is an event occurrence time
  • T o is an NTP
  • the synchronization precision may be gradually lowered due to the reproduction delay occurring in the media reproduction process. In order to compensate for this, it is possible to request the media source device 100 for the current playback position. However, in a situation where a plurality of devices are simultaneously streaming, transmission of the frequent synchronization control packet 10 may increase network congestion.
  • the client device 200 performing the event-based synchronization performs local playback position error correction .
  • the client device 200 can perform local reproduction position error correction by correcting the position by calculating the difference between the currently expected reproduction position and the actual reproduction position locally.
  • the client device 200 uses the synchronization control packet 10 received from the media source device 100 to correct a local playback position error occurring after the last time of synchronizing the playback state according to the event type . That is, through the local reproduction position error correction, the reproduction position error occurring after the last event-based synchronization point is corrected.
  • a media streaming group synchronization system in a hierarchical streaming network may include a media streaming group synchronization system, The synchronization accuracy can be maintained by minimizing the transmission of the synchronization control packet 10 through the local reproduction position error correction.
  • the local playback position error correction is performed using the following equation (2).
  • Equation (2) P 1 represents the reproduction position expected at the current time, P e represents the last event-based synchronization correction position, T 1 represents the current time, and T e represents the last event-based synchronization correction time. Also, fps represents the number of frames per second of the streaming media.
  • the playback time per frame is set so that the calculated playback position indicates the playback position of the next frame And correct it. This process is not necessary for event-based synchronization because the media player automatically corrects the position of the next frame when the playback position is moved using the player search bar of the media source device 100.
  • the predetermined interval value may be stored in the Extra field of the synchronization control packet 10 as described above with reference to FIG.
  • the media source device 100 transmits the synchronization control packet 10 to the client device 200 at a predetermined period in a situation where no playback event occurs,
  • the playback position of the device 200 can be further corrected. This procedure is referred to as " rare periodic synchronization " in the present invention and is intended to supplement the local reproduction position error correction process.
  • a media streaming group synchronization system in a hierarchical streaming network according to an exemplary embodiment of the present invention includes a media streaming group synchronization system, It is rarely periodically checked and corrected whether the local reproduction position error correction of the recording medium 100 is operating precisely.
  • the synchronization control packet 10 for the movement event of the reproduction position is lost, the synchronization control packet 10 is supplemented.
  • Equation (1) for rare periodic synchronization correction is the same as Equation (1), which is a moving event correction mathematical expression of the reproduction position of the event-based synchronization.
  • the media source device 100 and the client device 200 may be implemented by any type of portable terminal or computer capable of installing an application.
  • the portable terminal is a wireless communication device that is guaranteed to be portable and mobility, and can be used as a personal communication system (PCS), a global system for mobile communications (GSM), a personal digital cellular (PDC), a personal handyphone system (PHS) Handheld devices such as a handheld device, an assistant, an IMT (International Mobile Telecommunication) -2000, a Code Division Multiple Access (CDMA) -2000, a W-CDMA ) Based wireless communication device, and the computer may include a desktop, a notebook, a laptop, or the like, on which a WEB Browser is mounted. It may also be a smart device such as a smart phone, a smart note, a tablet PC, a smart camera, a smart TV, or a wearable computer.
  • a smart device such as a smart phone, a smart note, a tablet PC, a smart camera, a smart TV, or a
  • the application installed in the media source device 100 and the client device 200 may be an executable program installed by an installation program managed by an application server operated in a communication network or the like.
  • a media streaming group synchronization method in a hierarchical streaming network includes a media source device 100 serving as a media server, at least one client device 200 A media streaming group synchronizing method in a hierarchical streaming network for performing media streaming on a media streaming network, wherein the media source device (100) (S100) to the at least one client device (200); And at least one client device (200) synchronizing the playback status according to the type of event (S200) using the synchronization control packet (10) received from the media source device (100) in step S100,
  • the at least one client device 200 may further include performing a local playback position error correction at a predetermined interval (S300).
  • the media source device 100 transmits a synchronization control packet 10 at a predetermined period in a situation where no playback event occurs (S400) further correcting the playback position of the client device (200) by transmitting it to the client device (200).
  • Figure 7 is a flow diagram further comprising a rare periodic synchronization step in a method of synchronizing media streaming groups in a hierarchical streaming network according to an embodiment of the present invention.
  • the present invention may include a computer-readable medium including program instructions for performing operations implemented in various communication terminals.
  • the computer-readable medium can be any suitable medium, such as magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD ROM, DVD, Magneto-optical media and hardware devices that are specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.
  • Such computer-readable media may include program instructions, data files, data structures, etc., alone or in combination.
  • the program instructions recorded on the computer-readable medium may be those specially designed and configured to implement the present invention or may be those known to those skilled in the computer software.
  • it may include machine language code such as that produced by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like.
  • the event-based synchronization application and the local playback position error correction in the client device And the control error generated by the process operating in the background, the reproduction position is corrected by calculating the difference between the reproduction position and the actual reproduction position which are expected locally at the current time, and thereby the transmission of the synchronization control packet Can be minimized.
  • synchronization is performed rarely but periodically even in a situation in which no playback event occurs, i.e., even in a situation in which event-based synchronization is not applied, so as to not only recalibrate the error occurring in the local playback position correction, It is possible to perform the position correction for the movement event of the position against the loss of the synchronization control packet.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Human Computer Interaction (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

Selon un système et un procédé de synchronisation de groupes de diffusion en continu multimédia dans un réseau de diffusion en continu hiérarchique, proposé par la présente invention, une différence entre une position de reproduction réelle et une position de reproduction locale attendue à un moment actuel peut être calculée afin de corriger une position de reproduction en corrigeant une erreur de position de reproduction locale dans un dispositif client tout en appliquant une synchronisation basée sur un événement, en ce qui concerne une erreur de commande générée en raison des performances matérielles et d'un processus exécuté en arrière-plan. Par conséquent, la présente invention peut réduire au minimum la transmission d'un paquet de commande de synchronisation tout en maintenant une précision de synchronisation élevée.
PCT/KR2018/000487 2018-01-10 2018-01-10 Système et procédé de synchronisation de groupes de diffusion en continu multimédia dans un réseau de diffusion en continu hiérarchique WO2019139184A1 (fr)

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KR10-2018-0003236 2018-01-10
KR1020180003236A KR101988613B1 (ko) 2018-01-10 2018-01-10 계층적 스트리밍 네트워크에서의, 미디어 스트리밍 그룹 동기화 시스템 및 방법

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US11277461B2 (en) 2019-12-18 2022-03-15 The Nielsen Company (Us), Llc Methods and apparatus to monitor streaming media

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US20100124404A1 (en) * 2008-11-14 2010-05-20 Sang Wook Park Multimedia playing system and method for playing multimedia using the same
KR20120063431A (ko) * 2010-12-07 2012-06-15 삼성전자주식회사 멀티미디어 컨텐츠를 송수신하는 송신 장치 및 수신 장치와, 그 재생 방법
EP2592842A1 (fr) * 2011-11-14 2013-05-15 Accenture Global Services Limited Procédé informatique, système informatique et produit de programme informatique pour synchroniser la sortie des données multimédia dans plusieurs dispositifs
KR101507032B1 (ko) * 2014-08-26 2015-04-01 계명대학교 산학협력단 스트리밍 미디어의 실시간 동기화 재생 시스템 및 방법
KR20170138647A (ko) * 2016-06-08 2017-12-18 에스케이텔레콤 주식회사 미디어 재생 프로그램

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100124404A1 (en) * 2008-11-14 2010-05-20 Sang Wook Park Multimedia playing system and method for playing multimedia using the same
KR20120063431A (ko) * 2010-12-07 2012-06-15 삼성전자주식회사 멀티미디어 컨텐츠를 송수신하는 송신 장치 및 수신 장치와, 그 재생 방법
EP2592842A1 (fr) * 2011-11-14 2013-05-15 Accenture Global Services Limited Procédé informatique, système informatique et produit de programme informatique pour synchroniser la sortie des données multimédia dans plusieurs dispositifs
KR101507032B1 (ko) * 2014-08-26 2015-04-01 계명대학교 산학협력단 스트리밍 미디어의 실시간 동기화 재생 시스템 및 방법
KR20170138647A (ko) * 2016-06-08 2017-12-18 에스케이텔레콤 주식회사 미디어 재생 프로그램

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