WO2009059499A1 - Procede et systeme de traitement de decalage temporel de television sur ip - Google Patents

Procede et systeme de traitement de decalage temporel de television sur ip Download PDF

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Publication number
WO2009059499A1
WO2009059499A1 PCT/CN2008/070881 CN2008070881W WO2009059499A1 WO 2009059499 A1 WO2009059499 A1 WO 2009059499A1 CN 2008070881 W CN2008070881 W CN 2008070881W WO 2009059499 A1 WO2009059499 A1 WO 2009059499A1
Authority
WO
WIPO (PCT)
Prior art keywords
user terminal
unicast
play command
multicast
time
Prior art date
Application number
PCT/CN2008/070881
Other languages
English (en)
Chinese (zh)
Inventor
Jinchun Yang
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP08168632A priority Critical patent/EP2059044A3/fr
Publication of WO2009059499A1 publication Critical patent/WO2009059499A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26616—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for merging a unicast channel into a multicast channel, e.g. in a VOD application, when a client served by unicast channel catches up a multicast channel to save bandwidth
    • 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]
    • H04N21/60—Network 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 
    • H04N21/63—Control 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
    • H04N21/64—Addressing
    • H04N21/6408—Unicasting
    • 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]
    • H04N21/60—Network 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 
    • H04N21/63—Control 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
    • H04N21/643—Communication protocols
    • H04N21/64322—IP
    • 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]
    • H04N21/60—Network 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 
    • H04N21/65—Transmission of management data between client and server
    • H04N21/658—Transmission by the client directed to the server
    • H04N21/6587—Control parameters, e.g. trick play commands, viewpoint selection

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a network television time shift processing method and system. Background technique
  • IPTV Internet TV
  • IPTV Internet TV
  • IPTV Internet TV
  • IPTV Internet TV
  • It is a brand-new technology that uses broadband cable TV networks to integrate Internet, multimedia, and communication technologies to provide home users with a variety of interactive services, including digital TV. Users can enjoy IPTV services in two ways at home: computer or network set-top box + regular TV. It can adapt well to the rapid development of today's networks and make full and effective use of network resources.
  • IPTV is different from traditional analog cable TV and is not the same as classic digital TV. Because traditional and classic digital TVs have the characteristics of frequency division, timing, and one-way broadcasting. Although classic digital TV has many technological innovations compared to analog TV, it is only a change in signal form without touching the media content.
  • IPTV IP Television
  • IPTV is an infrastructure that utilizes broadband cable television networks, with home televisions as the primary terminal appliances, and a variety of digital media services, including television programming, through Internet Protocol. Therefore, IPTV is a brand-new business form. It is a converged service integrating traditional TV programs, Internet information services and value-added services. It is also the real entry point for future digital homes. With its development, users will gradually recognize the IPTV platform as an entertainment and service center for their future home business. The architecture of IPTV itself also determines that it must develop in this direction.
  • the media content In the IPTV service, in order to ensure a certain definition, the media content is usually compression-encoded, but the encoded media code rate is still high. In order to save transmission bandwidth, the media stream is implemented by multicast technology transmission. However, when watching IPTV, users sometimes pause, rewind, etc., and then press play to continue watching. In order to maintain the continuity of the user's viewing, in the IPTV system, the user's behavior is treated as a "time shift" operation.
  • the prior art time shift operation is: Prepare a set of files for on-demand, the content is consistent with the live content. The user who normally views the live content receives the program transmitted through the multicast technology.
  • the system converts the user's request into an on-demand request for accessing the specific location of the file.
  • the system finds the corresponding location in the media file according to the breakpoint information in the user request, and transmits the subsequent program stream to the user in a unicast technology.
  • the server After the user shifts time, the server continuously transmits through the unicast technology. Subsequent user operations are for on-demand files, which means that the server needs to establish a unicast transport channel for each time-shifted user terminal.
  • the disadvantage of this method is that as the number of time-shifted users increases, the system bandwidth consumption also increases, and system performance will be greatly reduced. Summary of the invention
  • the main purpose of the present invention is to provide a network TV time shift processing method and system, which can automatically automatically switch users to multicast play without user intervention, and solve the problem of long-term unicast continuous transmission in the prior art. This leads to technical defects in system bandwidth consumption and system performance degradation.
  • An embodiment of the present invention provides a network television time shift processing method, including the following steps: receiving a play command of a user terminal after a time shift occurs; and adjusting a unicast transmission rate of the user terminal according to a play command of the user terminal,
  • the unicast transmission process can be consistent with the multicast transmission process of the server after the unicast transmission for a certain period of time; the media stream corresponding to the play command is transmitted to the user terminal by unicast; when the unicast transmission process and the unicast transmission process When the multicast transmission process is consistent, the media stream corresponding to the play command is switched to multicast for transmission.
  • the embodiment of the present invention further provides a network television time shift processing system, including a server and at least one user terminal, where the user terminal is configured to send a play command to the server, and the server is configured to adjust according to the play command.
  • the unicast transmission rate of the user terminal is such that the unicast transmission process can be consistent with the multicast transmission process of the server after being transmitted for a certain time by unicast, and simultaneously Transmitting, by the unicast, the media stream corresponding to the play command to the user terminal, and switching the media stream corresponding to the play command when the unicast transmission process of the user terminal is consistent with the multicast transmission process Transfer to multicast.
  • the embodiment of the present invention further provides a network television time shift processing server, including a command receiving module, a unicast playback processing module, and a multicast switching module, where the command receiving module is configured to receive a play command of a user terminal that has a time shift;
  • the unicast playback processing module is configured to adjust a unicast transmission rate to the user terminal according to the play command, so that the unicast transmission process can be consistent with the multicast transmission process of the server after being transmitted by using unicast for a certain period of time And transmitting the media stream requested by the user terminal to the user terminal by using a unicast;
  • the multicast switching module configured to: when the unicast transmission process is consistent with the multicast transmission process, The media stream corresponding to the play command is switched to multicast for transmission.
  • FIG. 1 is a flowchart of a method for processing time shift of a network television according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a method for processing time shift of a network television according to Embodiment 2 of the present invention
  • FIG. 3 is a structural diagram of a network television time shift processing system according to an embodiment of the present invention. detailed description
  • FIG. 1 is a flowchart of a network television time shift processing method according to Embodiment 1 of the present invention, which can be based on a user terminal in this embodiment.
  • the command combination determines the corresponding rate adjustment policy, and adjusts the current unicast transmission rate according to the rate adjustment policy, so that it can be consistent with the multicast transmission rate as soon as possible, thereby switching to multicast for transmission. For example, if the user presses the play button after pressing the pause button, the user's transmission rate is appropriately increased to be consistent with the multicast, and the real-time delivery is performed.
  • the user terminal may be a terminal device capable of IPTV playback, such as an STB (Set Top Box), a mobile phone, or a PC terminal.
  • This embodiment includes the following steps: Step S101: The user terminal sends a request command to the server, and the server returns a response to the request command, and correspondingly transmits the media requested by the user terminal to the user terminal.
  • Step S102 After receiving the command that the user terminal pauses, rewinds, or drags to enter the time shift state, the server determines that the user terminal has a time shift.
  • Step S103 The server receives a play command of the time shifting user terminal.
  • the common protocol for requesting and responding to the IPTV is the RTSP protocol.
  • RTSP consists of a message header and a message body.
  • the message header defines some attributes related to the command.
  • the pause is implemented by the RTSP-PAUSE command;
  • the playback is implemented by the RTSP-PLAY command, and the Scale attribute of the command message is 1;
  • the fast rewind operation can also be implemented by the RTSP-PLAY command, but the Scale attribute of the command message is one.
  • a non-zero rational number, such as Scale -3.5, indicates that the user terminal is required to rewind 3.5 times relative to the normal playback speed.
  • Step S1Q4 the server determines whether the play command is a play command after a command that causes a time shift state, such as pause, rewind, or post drag, to determine whether the RTSP-PLAY command is received after step S102. If the normal play command received by the server is after a pause, forward or backward drag command that causes the time shift status to be entered, then the server defaults to the need to adjust the unicast transmission rate so that the unicast transmission process is transmitted after unicast for a certain period of time. It can be consistent with the multicast transmission process of the server.
  • a time shift state such as pause, rewind, or post drag
  • Step S105 since the fast rewind operation can also be implemented by the RTSP_PLAY command, it is also required to detect whether the Scale parameter is 1 after receiving the RTSP-PLAY command. If the Scale parameter is not 1, it means that the user may press the "fast forward” or “rewind” button, the system will process it in the media server's default processing mode. When the Scale parameter is 1, the system modifies the Scale value with a preset policy.
  • Step S106 if it is a play command after the pause command and the Scale value is 1, the corresponding rate adjustment policy is determined according to the play command of the user terminal.
  • the rate adjustment strategy proposed by the present invention is as follows:
  • the playback speed is a reasonable number of reasonable numbers.
  • Step S108 When the unicast transmission process is consistent with the multicast transmission process of the server, the server switches the media stream corresponding to the play command to multicast for transmission, and deletes the unicast transmission channel.
  • the unicast can be quickly played according to the normal play command input by the user, and when the unicast play catches up with the multicast play, the media stream is switched to the multicast for transmission, and the unicast transport channel is deleted, thereby achieving Save bandwidth.
  • the embodiment of the present invention can determine whether the unicast transmission rate needs to be adjusted according to the normal play command by parsing the normal play command of the user after the time shift state, so that the user can watch the broadcast without affecting the user's viewing.
  • the media stream that is transmitted can be gradually consistent with the multicast transmission, thereby finally deleting the unicast transmission channel, thereby saving bandwidth and optimizing system performance.
  • FIG. 2 is a flowchart of a network television time shift processing method according to Embodiment 2 of the present invention.
  • the manner in which the multicast group is sent by the carousel server is used to select the multicast group whose playing time is closest to the user terminal to join, so that the time for the user to play the unicast is the shortest, and thus the user is generated.
  • the impact is also minimal.
  • Step S201 The carousel server sends the same media to different multicast groups at regular time intervals. Body content, and a multicast link for each multicast group. However, for the user, the server only provides a media link for the user for a specific media. After clicking the media link, the server selects which multicast group the user should join, and then the multicast link corresponding to the multicast group. Access is made.
  • Step S202 The server receives a play command of the user terminal that is time-shifted. Since the user terminal has time-shifted during playback, it cannot be consistent with the multicast that is normally played. Therefore, the server needs to transmit the media requested by the user terminal to the user through unicast.
  • Step S203 The server selects a multicast group that is closest to the time when the user terminal sends the play command according to the time when the user terminal sends the play command.
  • the specific time is: the server reads the current time t of receiving the user play command, and searches for the start time T of the closest multicast group, wherein the search time T of the corresponding multicast group is preferably used to quickly find Algorithms are performed, such as dichotomy. Calculate the difference between the start time T and the current time t of the received command, such as calculating min
  • Step S204 The server sets a corresponding rate adjustment policy according to the time when the play command is sent and the multicast group play time difference.
  • the rate adjustment strategy can be normal speed, fast play or smart play.
  • Step S205 Set a Sca l e value of the RTSP-PLAY command according to the rate adjustment policy. Specifically, firstly, according to the difference between the multicast group broadcast time T and the current time t of the received command, if it is determined that tT is positive, the user play time is earlier than the determined multicast group start time, so Sca le is set. If the tT is negative, the user playback time is later than the determined multicast group start time. Therefore, setting Sca le to a positive number speeds up the playback speed.
  • Step S206 The server adjusts the playback speed of the unicast according to the Sca l e value corresponding to the current user RTSP_PLAY command, and transmits the media stream requested by the user terminal to the user terminal by using unicast.
  • Step S207 When the unicast transmission process is consistent with the multicast transmission process of the multicast group, the service The device will switch the media stream of the user terminal to the multicast group selected by the server, and delete the unicast transmission channel.
  • the foregoing embodiment of the present invention selects the closest multicast group for the user requesting to play, and adjusts the unicast playback speed according to the time difference between the multicast group and the current user request, thereby enabling unicast without user intervention. Playback can be consistent with multicast playback, and when unicast playback can be consistent with multicast playback, the media stream is switched to multicast for transmission, and the unicast transmission channel is deleted, thereby achieving bandwidth saving.
  • FIG. 3 it is a structural diagram of a network television time shift processing system according to an embodiment of the present invention.
  • the system includes a server 1 and at least one user terminal 2, and the user terminal 2 is configured to send a play command to the server 1, where the user terminal 2 can It is a terminal device capable of performing IPTV playback, such as an STB, a mobile phone, or a PC terminal; the server 1 is configured to adjust a unicast transmission rate to the user terminal 2 according to a play command sent by the user terminal 2, so that unicast transmission after a certain time is transmitted through unicast
  • the process can be consistent with the multicast transmission process of the server 1, and the media stream corresponding to the play command is transmitted to the user terminal 2 through unicast, and when the unicast transmission process of the user terminal 2 is consistent with the multicast transmission process, The media stream corresponding to the play command is switched to multicast for transmission.
  • the server 1 includes a command receiving module 11, a unicast playback processing module 12, and a multicast switching module 13.
  • the command receiving module 1 1 is configured to receive a play command of the user terminal 2 that occurs when the time shift occurs.
  • the unicast play processing module 12 is configured to adjust the play command according to the play command received by the command receiving module 11 after the command receiving module 11 receives the play command.
  • the unicast transmission rate of the user terminal 2 is such that the unicast transmission process can be consistent with the multicast transmission process of the server 1 after the unicast transmission for a certain period of time, and the media stream requested by the user terminal 2 is transmitted to the user terminal 2 by unicast;
  • the multicast switching module 13 is configured to switch the media stream corresponding to the play command to multicast for transmission when the unicast transmission process is consistent with the multicast transmission process of the server 1.
  • the unicast playback processing module 12 includes a judging sub-module 121 and a rate adjustment policy determining sub-module 122, and the judging sub-module 121 is configured to determine whether the play command is in a time-shift state caused by pause, rewind, or drag. Normal play command after command; rate adjustment strategy determines submodule
  • the block 122 is configured to determine, according to the play command of the user terminal 2, a corresponding rate adjustment policy, and adjust the time shift user according to the rate adjustment policy, when the determining submodule 121 determines that the play command is after the command that causes the time shift state to be entered.
  • the unicast transmission rate of the terminal 2 enables the unicast transmission process to be consistent with the multicast transmission process of the server 1 after being transmitted for a certain time by unicast.
  • the server 1 further includes a carousel server module 14 for transmitting the same media stream to different multicast groups at regular time intervals.
  • the unicast playback processing module 12 includes a multicast group determining sub-module 123 and a rate adjustment policy setting sub-module 124, and the multicast group determining sub-module 123 is configured to select a multicast that has the closest start time to the user terminal 2 to send the play command time.
  • the rate adjustment policy setting sub-module 124 sets the rate adjustment policy according to the playing time of the selected multicast group and the receiving time of the play command, and adjusts the unicast transmission rate to the user terminal 2.
  • the server 1 further includes a unicast channel deletion module 15 for deleting the unicast transmission channel after the multicast switching module 13 transfers the media stream of the user terminal 2 to the multicast.
  • the normal play command input by the user can determine whether the unicast transmission rate needs to be adjusted according to the normal play command, so that it can be quickly and without affecting the user's viewing.
  • the multicast is consistent, which removes the unicast transport channel and saves bandwidth.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better.
  • Implementation Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a Taiwan A computer device (which may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.

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

Abstract

L'invention concerne un procédé de traitement de décalage temporel de télévision sur IP (IPTV), consistant : à recevoir la commande de lecture du terminal utilisateur après la survenue d'un décalage temporel ; à ajuster la vitesse de transmission monodiffusion vers le terminal utilisateur en fonction de la commande de lecture du terminal utilisateur, de sorte que le cours de la transmission monodiffusion soit conforme au cours de transmission multidiffusion du serveur après que la transmission monodiffusion a été réalisée pendant un certain temps ; à transmettre le flux multimédia correspondant à la commande de lecture au terminal utilisateur par la transmission monodiffusion ; à effectuer une commutation vers la transmission multidiffusion pour transmettre le flux multimédia correspondant à la commande de lecture, lorsque le cours de transmission monodiffusion est conforme au cours de transmission multidiffusion. Un mode de réalisation de l'invention permet d'ajuster la vitesse de transmission monodiffusion du serveur à l'utilisateur par l'analyse de l'action de lecture de l'utilisateur après l'état de décalage temporel pour que le flux multimédia transmis par monodiffusion soit conforme au flux multimédia transmis par multidiffusion, graduellement, de sorte que le canal de transmission monodiffusion soit finalement supprimé pour réaliser des économies de bande passante.
PCT/CN2008/070881 2007-11-07 2008-05-05 Procede et systeme de traitement de decalage temporel de television sur ip WO2009059499A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08168632A EP2059044A3 (fr) 2007-11-07 2008-11-07 Procédé et système pour le traitement du décalage temporel dans la IPTV

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710166596.2 2007-11-07
CN2007101665962A CN101431657B (zh) 2007-11-07 2007-11-07 一种网络电视时移处理方法、系统和装置

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WO2009059499A1 true WO2009059499A1 (fr) 2009-05-14

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CN102149021B (zh) * 2010-02-05 2013-09-25 华为技术有限公司 网络时移的处理方法、装置及系统
WO2011157143A2 (fr) * 2011-05-31 2011-12-22 华为技术有限公司 Procédé et dispositif de transfert multi-débit dans une diffusion en direct
CN112019927B (zh) * 2020-09-23 2023-01-06 Oppo广东移动通信有限公司 视频直播方法、连麦设备、直播系统及存储介质

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CN1852421A (zh) * 2005-11-30 2006-10-25 华为技术有限公司 一种实现直播与时移播放之间切换的方法
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US20070081789A1 (en) * 2005-10-06 2007-04-12 Lockheed Martin Corporation Time shifting for video
CN1852421A (zh) * 2005-11-30 2006-10-25 华为技术有限公司 一种实现直播与时移播放之间切换的方法
KR20070060969A (ko) * 2005-12-09 2007-06-13 한국전자통신연구원 Ｉｐｔｖ 방송에서 시청시간 이동 서비스 방법

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CN101431657A (zh) 2009-05-13

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