WO2012174956A1 - Procédé et dispositif de commutation de canal iptv - Google Patents

Procédé et dispositif de commutation de canal iptv Download PDF

Info

Publication number
WO2012174956A1
WO2012174956A1 PCT/CN2012/075308 CN2012075308W WO2012174956A1 WO 2012174956 A1 WO2012174956 A1 WO 2012174956A1 CN 2012075308 W CN2012075308 W CN 2012075308W WO 2012174956 A1 WO2012174956 A1 WO 2012174956A1
Authority
WO
WIPO (PCT)
Prior art keywords
stream data
media stream
client
iptv channel
sent
Prior art date
Application number
PCT/CN2012/075308
Other languages
English (en)
Chinese (zh)
Inventor
曹亚林
黎定军
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012174956A1 publication Critical patent/WO2012174956A1/fr

Links

Classifications

    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/23106—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
    • 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
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
    • H04N21/2401—Monitoring of the client buffer
    • 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
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
    • H04N21/2408—Monitoring of the upstream path of the transmission network, e.g. client 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]
    • H04N21/60—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 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • 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 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6175—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via Internet

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for IPTV channel switching. Background technique
  • IPTV applications are widely recognized.
  • an important issue that plagues operators and users is the slow switching speed of IPTV channels.
  • Existing IPTV systems cannot be compared to traditional cable televisions in terms of switching speed. Therefore, increasing the speed of IPTV channel switching has become an important concern.
  • the existing IPTV system uses multicast as the basic transmission technology.
  • the channel switch is sent by the client to leave and join the multicast.
  • the reasons for the slow switching speed are the processing time of multicast leaving and joining, the key information acquisition time on the client, and the network transmission delay.
  • the above key information refers to the content that can be directly decoded and played by the client, including the I-frame (Intra-coded Frame), PAT (Program Associate Table) and PMT (Program Mapping) in the encoding. Table, program map table).
  • I-frame Intra-coded Frame
  • PAT Program Associate Table
  • PMT Program Mapping
  • the key information has a certain time interval in the encoding, such as I frame interval of 2 seconds, PAT and The PMT interval is 0.5 seconds, so the time to wait for critical information becomes a major factor in slow channel switching.
  • the prior art proposes a method for forwarding IPTV media stream data through a cache.
  • the client When a client joins a new channel, the client directly sends data to the client from the first I frame in the cache.
  • the above method only focuses on accelerating the switching of the IPTV channel through the cache, and only pays attention to the I frame, and does not pay attention to the PAT and the PMT.
  • the client only receives the data of the I frame and cannot directly decode it.
  • Output must have corresponding PAT and PMT to display.
  • the content of the cache has a certain delay relative to the content of the live broadcast, for example, three I frames are buffered for the requested channel in the cache. When the channel is requested, the content sent is 3 I before the current live broadcast.
  • the main object of the present invention is to provide a method and apparatus for IPTV channel switching, which improves the IPTV channel switching speed.
  • a method for IPTV channel switching comprising:
  • the PAT and the PMT corresponding to the multicast group are sent to the client; and the cached IPTV channel corresponding to the multicast group join message is also sent.
  • Media stream data to the client.
  • the method further includes:
  • the sent media stream data is consistent with the received media stream data, or the media stream data broadcasted by the IPTV channel starts to be sent to the client from the network device where the cache is located, stopping sending the cached media corresponding to the IPTV channel Stream data.
  • the speed at which the buffered media stream data is transmitted is greater than the speed at which the media stream data is received.
  • the method for sending the media stream data to the client is: sending the buffered media stream data from a complete I frame received last through the cache.
  • the sending the media stream data to the client includes:
  • a device for switching an IPTV channel comprising:
  • a cache module configured to cache media stream data of each IPTV channel sent by the program source
  • an extracting module configured to extract PAT and PMT of each IPTV channel
  • the first sending module is configured to: when receiving the multicast group joining message of the client, send the PAT and the PMT corresponding to the multicast group to the client;
  • the second sending module is configured to send the buffered media stream data of the IPTV channel corresponding to the multicast group join message to the client.
  • the stopping module is configured to stop sending the corresponding IPTV channel when the sent media stream data is consistent with the received media stream data, or the media stream data of the IPTV channel is sent to the client from the network device where the cache is located. Cached media stream data.
  • the speed at which the buffered media stream data is transmitted is greater than the speed at which the media stream data is received.
  • the second sending module when sending the media stream data to the client, is configured to: start to send the buffered media stream data from a complete I frame received through the cache. Among them, it also includes:
  • the monitoring module is configured to monitor whether the sent cached media stream data is consistent with the received media stream data, and whether the media stream data broadcasted by the IPTV channel starts to be sent from the network device where the cache is located to the client.
  • the method and device for IPTV channel switching proposed by the present invention first cache media stream data of all IPTV channels, extract PAT and PMT of each IPTV channel, and identify I frames in the buffer data.
  • the PAT and the PMT are sent first, and then the media stream data is sent from the last I frame finally received in the cache, because the sent media stream data is completely cached media stream data.
  • Copy the client can decode and play directly, speeding up IPTV The switching speed of the channel. Also, since the transmission starts from the last I frame received in the cache, the effect of the delay relative to the live broadcast is reduced.
  • the live media stream data is monitored to be sent from the network device where the cache is located to the client, and the cache data is stopped after the start, and then the live data stream is completely transmitted from the network device. Forwarding, avoiding the delay caused by sending media stream data from the cache.
  • FIG. 1 is a schematic flowchart of a method for IPTV channel switching according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another embodiment of an IPTV channel switching method according to the present invention
  • FIG. 4 is a schematic structural diagram of an apparatus for IPTV channel switching according to an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an embodiment of a method for IPTV channel switching according to the present invention includes: S10. Media stream data of each IPTV channel sent by a cached program source;
  • the multicast group When receiving the multicast group join message from the client for the new IPTV channel, the multicast group joins the 4 ⁇ text to find the cache data corresponding to the IPTV channel, and sends the PAT and PMT of the corresponding IPTV channel in the cache to the client first. Then, the cached media stream data is sent to the client, and the content sent is completely a copy of the cached content. Because all the key information needed for decoding is sent to The client enables the client to directly decode and play after receiving the key information, which reduces the switching time of the IPTV channel and improves the switching speed of the IPTV channel.
  • the media stream data of all IPTV channels is first buffered, and the PAT and PMT of each IPTV channel are extracted.
  • the PAT and the PMT are sent first, and then the media stream data is sent from the latest I frame in the cache. Since the sent media stream data is completely a copy of the cached media stream data, the client can Direct decoding and playback speeds up the switching speed of IPTV channels.
  • S13 may include: starting to send the media stream data in the buffer from the last I frame received last in the cache; identifying the I frame in the media stream data while separately buffering the PAT and the PMT .
  • the PAT and the PMT are sent first, and then the media stream data is sent to the client from the latest complete I frame; in this embodiment, the first I frame is sent from the cache.
  • Cache data reducing the delay time, and further improving the switching speed of the IPTV channel.
  • the method further includes:
  • the normal forwarding and the cache forwarding of the IPTV channel multicast occur in the same network device, and the media stream data is sent to the client through the cache, and the normal forwarding situation of the IPTV channel multicast requested by the client is directly detected. (ie, the live broadcast situation), to know when the normal multicast media data is forwarded by the normal channel, and also to monitor the sent cache media stream data. No, it is consistent with the arrival of media stream data received by normal multicast.
  • the multicast starts to forward the media stream data to the client normally, or the buffered media stream data is consistent with the media stream data received by the normal multicast (the rate of the buffer transmission may be faster than the rate of receiving the media stream data normally, for example,
  • the normal multicast rate is 1.2 times, which cannot exceed the limit of the downstream access bandwidth, and cannot exceed the receiving capability of the client.
  • the packet data is stopped and the media stream data of the new IPTV channel is normally forwarded in multicast mode.
  • the delay caused by sending media stream data from the cache is avoided, and a cache link in the multicast forwarding process is reduced.
  • an apparatus for IPTV channel switching includes: a buffering module 10, configured to cache media stream data of each IPTV channel sent by a program source; and an extracting module 20, configured to extract PAT of each IPTV channel. PMT;
  • the first sending module 30 is configured to: when receiving the multicast group join message of the client, send the PAT and the PMT corresponding to the multicast group to the client;
  • the second sending module 40 is configured to send the buffered media stream data of the IPTV channel corresponding to the multicast group join message to the client.
  • the cache module 10 receives the media data stream of all the IPTV channels that are broadcasted, buffers the media data stream, and the extraction module 20 identifies the key information therein, and separately caches the PAT and the PMT.
  • the first sending module 30 searches for the cache data corresponding to the IPTV channel according to the multicast group join message, and sends the PAT and PMT of the corresponding IPTV channel in the cache first.
  • the second sending module 40 begins to send the cached media stream data to the client, the content being sent is completely a copy of the cached content. Since all the key information required for decoding is sent to the client, the client can directly decode and play after receiving the key information, which reduces the switching time of the IPTV channel and improves the switching speed of the IPTV channel.
  • media stream data of all IPTV channels is first buffered, and each IPTV frequency is extracted.
  • the PAT and PMT of the road When receiving the request of the client to switch the IPTV channel, the PAT and the PMT are sent first, and then the media stream data is sent from the latest I frame in the cache. Since the sent media stream data is completely a copy of the cached media stream data, the client can Direct decoding and playback speeds up the switching speed of IPTV channels.
  • the second sending module 40 is specifically configured to: start to send the media stream data in the buffer from the last I frame finally received in the cache. While the extraction module 20 caches the PAT and the PMT separately, it also identifies the I frame in the media stream data. When receiving the multicast group join message of the client, the first sending module 30 first sends the PAT and the PMT, and then the second sending module 40 sends the media stream data to the client from the latest complete I frame. This embodiment compares The buffer data is sent from the first I frame of the cache, which reduces the delay time and further improves the switching speed of the IPTV channel.
  • the method further includes:
  • the monitoring module 50 is configured to monitor whether the media stream data sent in the cache is consistent with the received media stream data, and whether the media stream data broadcasted by the IPTV channel starts to be sent from the network device where the cache is located to the client.
  • the stopping module 60 is configured to stop sending the corresponding IPTV channel when the media stream data sent in the buffer is consistent with the received media stream data, or the media stream data broadcasted by the IPTV channel starts to be sent to the client from the network device where the cache is located. Cached media stream data.
  • the normal forwarding and the cache forwarding of the IPTV channel multicast occur in the same network device.
  • the monitoring module 50 directly detects the client requesting the switching. Normal forwarding of IPTV channel multicast (ie, live broadcast), to know when normal multicast forwards new channel media stream data, and also monitors whether the transmitted cache media stream data and media stream data received by normal multicast are received. Arrived consistently.
  • the monitoring module 50 detects that the multicast starts to normally forward the media stream data to the client, or caches
  • the transmitted media stream data is consistent with the media stream data received by the normal multicast (the rate of the buffer transmission is faster than the rate of receiving the media stream data normally, for example, 1.2 times the normal multicast rate, and cannot exceed the limit of the downstream access bandwidth.
  • the stop module 60 stops sending cached data.
  • the delay caused by sending media stream data from the cache is avoided, and a cache link in the multicast forwarding process is reduced.
  • the method and device for IPTV channel switching proposed by the present invention first cache media stream data of all IPTV channels, extract PAT and PMT of each IPTV channel, and identify I frames in the buffer data.
  • the PAT and the PMT are sent first, and then the media stream data is sent from the last I frame finally received in the cache, because the sent media stream data is completely cached media stream data.
  • Copy the client can directly decode and play, speeding up the switching speed of the IPTV channel. Also, since the transmission starts from the last I frame received in the cache, the effect of the delay relative to the live broadcast is reduced.
  • the live media stream data is monitored to be sent from the network device where the cache is located to the client, and the cache data is stopped after the start, and then the live data stream is completely transmitted from the network device. Forwarding, avoiding the delay caused by sending media stream data from the cache.

Landscapes

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

Abstract

L'invention concerne un procédé et un dispositif de commutation de canal IPTV, aptes à mettre en tampon des données de flux multimédia de chaque canal IPTV envoyées par une source de programme ; d'extraire un PAT et un PMT de chaque canal IPTV ; lors de la réception d'un message pour rejoindre un groupe de diffusion groupée à partir d'un client, d'envoyer au client le PAT et le PMT correspondant au message pour rejoindre un groupe de diffusion groupée ; d'envoyer en outre au client les données de flux multimédia mises en tampon du canal IPTV correspondant au message pour rejoindre un groupe de diffusion groupée. Les données de flux multimédia envoyées constituent entièrement la copie des données de flux multimédia mises en tampon, de telle sorte que la présente invention permet à un client de réaliser directement un décodage et une lecture, ce qui permet ainsi d'augmenter la vitesse de commutation de canal IPTV.
PCT/CN2012/075308 2011-06-22 2012-05-10 Procédé et dispositif de commutation de canal iptv WO2012174956A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2011101696435A CN102231848A (zh) 2011-06-22 2011-06-22 Iptv频道切换的方法及装置
CN201110169643.5 2011-06-22

Publications (1)

Publication Number Publication Date
WO2012174956A1 true WO2012174956A1 (fr) 2012-12-27

Family

ID=44844373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/075308 WO2012174956A1 (fr) 2011-06-22 2012-05-10 Procédé et dispositif de commutation de canal iptv

Country Status (2)

Country Link
CN (1) CN102231848A (fr)
WO (1) WO2012174956A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102231848A (zh) * 2011-06-22 2011-11-02 中兴通讯股份有限公司 Iptv频道切换的方法及装置
FR3039735A1 (fr) * 2015-07-29 2017-02-03 Sagemcom Broadband Sas Procede de changement de service d'un decodeur de television numerique, et dispositif pour la mise en œuvre d'un tel procede
CN105898390A (zh) * 2015-08-31 2016-08-24 华南理工大学 基于虚拟视频总线多频道快速切换的方法及其系统
CN106937155B (zh) * 2015-12-29 2020-06-02 北京华为数字技术有限公司 接入设备、因特网协议电视iptv系统和频道切换方法
CN107396175A (zh) * 2017-08-16 2017-11-24 四川长虹电器股份有限公司 一种优化iptv频道切换速度的方法
CN111093090A (zh) * 2018-10-24 2020-05-01 玲珑视界科技（北京）有限公司 一种基于tcp的组播频道快速切换系统及方法
CN110300338A (zh) * 2019-07-26 2019-10-01 杭州当虹科技股份有限公司 一种快速切换播放组播视频的方法
CN114007087B (zh) * 2020-07-28 2023-04-11 华为技术有限公司 一种媒体流切换方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101702777A (zh) * 2009-10-30 2010-05-05 深圳创维数字技术股份有限公司 Iptv系统、音视频编码切换处理方法及设备
CN101753973A (zh) * 2008-12-12 2010-06-23 华为技术有限公司 一种频道切换方法、装置和系统
CN101998165A (zh) * 2010-09-19 2011-03-30 中兴通讯股份有限公司 一种iptv系统中频道切换的方法及系统
CN102231848A (zh) * 2011-06-22 2011-11-02 中兴通讯股份有限公司 Iptv频道切换的方法及装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1800479A4 (fr) * 2004-10-15 2010-07-21 Opentv Inc Changement de canal accelere
JP4937654B2 (ja) * 2006-07-12 2012-05-23 Ｋｄｄｉ株式会社 チャンネル切替用マルチキャスト配信装置、マルチキャスト配信システム及びチャンネル切替用マルチキャスト配信方法
CN101267545A (zh) * 2008-04-30 2008-09-17 中兴通讯股份有限公司 一种节目的切换方法及装置
CN101667208B (zh) * 2009-09-25 2013-06-26 深圳创维数字技术股份有限公司 数字电视接收机及其节目搜索、节目切换方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101753973A (zh) * 2008-12-12 2010-06-23 华为技术有限公司 一种频道切换方法、装置和系统
CN101702777A (zh) * 2009-10-30 2010-05-05 深圳创维数字技术股份有限公司 Iptv系统、音视频编码切换处理方法及设备
CN101998165A (zh) * 2010-09-19 2011-03-30 中兴通讯股份有限公司 一种iptv系统中频道切换的方法及系统
CN102231848A (zh) * 2011-06-22 2011-11-02 中兴通讯股份有限公司 Iptv频道切换的方法及装置

Also Published As

Publication number Publication date
CN102231848A (zh) 2011-11-02

Similar Documents

Publication Publication Date Title
WO2012174956A1 (fr) Procédé et dispositif de commutation de canal iptv
EP2385707B1 (fr) Procédé, dispositif et système de commutation de canal
WO2010139284A1 (fr) Procédé, système et dispositifs associés destinés à traiter une commutation de canal
JP2005124193A5 (fr)
WO2010054543A1 (fr) Procédé, dispositif et système pour la commutation de canaux
JP5421346B2 (ja) 高速チャンネル変更におけるユニキャストストリームの高速送信方法および装置
US20080022320A1 (en) Systems and Methods of Synchronizing Media Streams
WO2009039741A1 (fr) Procédé et dispositif permettant la commutation de chaînes iptv
WO2011153868A1 (fr) Procédé, appareil et système pour la commutation de voies
WO2018001184A1 (fr) Procédé de changement rapide de canal, serveur, et boîtier décodeur
WO2018166320A1 (fr) Procédé de changement de canal, et appareil
WO2011022994A1 (fr) Procédé, appareil et système d'acquisition rapide de sessions de protocole de transport de multidiffusion en temps réel
WO2010088836A1 (fr) Procédé et appareil de compensation de perte de paquet dans un mode de transmission selon le protocole udp
WO2011000270A1 (fr) Procédé, appareil et système permettant de réduire un retard multimédia
WO2008077302A1 (fr) Procédé et système de commutation de canaux multimédia numériques
CN111866526B (zh) 一种直播业务处理方法和装置
WO2012083841A1 (fr) Procédé, terminal et système pour changer de canal
WO2009097716A1 (fr) Procédé de découpage en tranches de contenu multimédia, procédé, dispositif et système pour fournir un contenu multimédia
US11050805B2 (en) Method of controlling stream buffer in media playback device and related buffering device
KR20100051962A (ko) Ｉｐｔｖ 방송 서비스 시스템 및 그 방법
JP5428734B2 (ja) ネットワーク機器、情報処理装置、ストリーム切替方法、情報処理方法、プログラムおよびコンテンツ配信システム
CN103685314B (zh) 实现流媒体播放单播和多播无缝切换的方法
CN101489101B (zh) 一种ip电视频道切换处理方法、装置和系统
CN103347207A (zh) 一种iptv组播频道快速切换的方法
CN105763941A (zh) 一种频道切换方法和系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12802769

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12802769

Country of ref document: EP

Kind code of ref document: A1