WO2009145294A1 - サーバ装置と通信方法ならびにプログラム - Google Patents
サーバ装置と通信方法ならびにプログラム Download PDFInfo
- Publication number
- WO2009145294A1 WO2009145294A1 PCT/JP2009/059855 JP2009059855W WO2009145294A1 WO 2009145294 A1 WO2009145294 A1 WO 2009145294A1 JP 2009059855 W JP2009059855 W JP 2009059855W WO 2009145294 A1 WO2009145294 A1 WO 2009145294A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- terminal
- packet
- stream
- terminals
- server device
- Prior art date
Links
Images
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
- H04N21/21—Server components or server architectures
-
- 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
-
- 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
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
-
- 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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41407—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop
-
- 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
- H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
-
- 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
- H04N21/637—Control signals issued by the client directed to the server or network components
- H04N21/6377—Control signals issued by the client directed to the server or network components directed to server
- H04N21/6379—Control signals issued by the client directed to the server or network components directed to server directed to encoder, e.g. for requesting a lower encoding rate
-
- 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
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64784—Data processing by the network
- H04N21/64792—Controlling the complexity of the content stream, e.g. by dropping packets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
- H04N7/148—Interfacing a video terminal to a particular transmission medium, e.g. ISDN
Definitions
- the present invention is based on the priority claim of Japanese Patent Application No. 2008-142745 (filed on May 30, 2008), and the entire contents of the same application are incorporated and described herein by reference. It shall be.
- the present invention relates to a server apparatus and a communication method, and in particular, at least two terminals join to generate a group, receive a stream or packet including a video signal from a first terminal, and copy the same.
- the present invention relates to a server apparatus, a communication method, and a program for sending to another terminal other than one terminal.
- N two or more terminals join to create a group, receive and copy packet data sent from the first terminal, and this is a terminal other than the first terminal.
- the service to be sent to (N-1 units) has already been started under the name of Push to talk over Cellular (PoC) for voice.
- PoC Push to talk over Cellular
- H. H. standardized internationally by ITU-T and ISO / IEC. H.264 / MPEG-4 AVC (Advanced Video Coding) can transmit moving picture signals more efficiently than the moving picture compression coding method.
- Patent Documents 1 and 2 when a frame is lost during transmission in a video streaming system, the client notifies the server of the frame loss when the next packet is correctly sent to the client, and the server uses the current prediction code.
- a configuration is disclosed in which the predictive coding frame of the coded frame sequence is skipped and then the transmission is resumed from the inner coded frame.
- Patent Document 3 discloses a configuration in which, in a multicast network, when a channel change request indicating a requested channel corresponding to a certain multicast group is detected, a held intra frame of the requested channel is transmitted as unicast communication. It is done.
- Patent Document 4 discloses that in service data stream transmission such as compressed video signal, a relatively large non-predicted frame is transmitted only on the basis of occurrence of an event, and in other cases, only a relatively small predicted frame is transmitted.
- An apparatus is disclosed. However, in any of the patent documents, at least two terminals join to generate a group, receive a stream or a packet including a video signal from the first terminal, copy it, and then the other than the first terminal. There is no disclosure of a server apparatus configured to send to another terminal of
- Patent Documents 1 to 4 are incorporated herein by reference. The following gives an analysis of the related art according to the present invention.
- the packet transmitted from the first terminal can not receive an I frame at the time of participation of the terminal even if there is a terminal participating in the group halfway through the packet.
- a compressed and encoded signal is received by the terminal, and is decoded and reproduced, the image is disturbed from the beginning.
- a packet including video content sent from a terminal (first terminal) having initiative in a group does not arrive at the server device, for example, in the mobile IP network, the packet is copied and the server device copies it and If it is sent to a terminal other than 1 terminal, an event such as deterioration of a video signal decoded by the terminal occurs in a certain time interval after the point when the packet is lost, and the quality of service is significantly reduced.
- An object of the present invention is a server in which two or more terminals join to generate a group, receive a stream including at least a video signal from a first terminal, copy it, and send it to terminals other than the first terminal
- An object of the present invention is to provide a server apparatus, a method, and a program that prevent degradation of image quality on a terminal side even for a terminal that has participated halfway through.
- Another object of the present invention is to create a group by joining two or more terminals, receive a stream including at least a video signal from a first terminal and copy it to a terminal other than the first terminal.
- two or more terminals join to create a group, receive a stream or packet including at least a video signal sent from a first terminal, copy some or all, and A server apparatus for transmitting the stream or packet after copying to a terminal different from one of the terminals, and when a new terminal joins the group during transmission, the first terminal is not
- a server device comprising a control unit for instructing to send out a predicted video frame.
- two or more terminals join to generate a group, receive a stream or packet including at least a video signal sent from the first terminal, copy some or all, and Is a server device that sends the copied stream or packet to a different terminal, and when the packet sent from the first terminal is lost and does not arrive at the server device, it is not predicted for the first terminal
- a server apparatus includes a control unit that issues an instruction to send out a video frame.
- a plurality of terminals join to generate a group
- a server apparatus receives a stream or packet including at least a video signal transmitted from a first terminal among the plurality of terminals.
- the server apparatus copies a part or all of the received stream or packet, and transmits the copied stream or packet to a terminal different from the first terminal among the plurality of terminals.
- the server apparatus is provided with a communication method for instructing the first terminal to transmit a non-predictive video frame when a new terminal joins the group during the transmission.
- a plurality of terminals join to generate a group
- a server apparatus receives a stream or a packet including at least a video signal transmitted from a first terminal among the plurality of terminals;
- the server apparatus copies a part or all of the received stream or packet, and transmits the copied stream or packet to a terminal different from the first terminal among the plurality of terminals.
- the server device instructs the first terminal to send a non-predictive video frame A method is provided.
- a plurality of terminals join to create a group, and receive a stream or packet including at least a video signal transmitted from a first terminal among the plurality of terminals,
- a server apparatus that copies part or all of the received stream or packet and sends the copied stream or packet to a terminal different from the first terminal among the plurality of terminals;
- a computer program is provided that causes the first terminal to execute a process of instructing non-predictive video frames to be transmitted when a new terminal joins the group during the transmission.
- a plurality of terminals join to generate a group, and receive a stream or packet including at least a video signal transmitted from a first terminal among the plurality of terminals, and receive the received stream or packet
- a server device that copies a part or all of the copy and sends the stream or packet after copying to a terminal different from the first terminal among the plurality of terminals;
- a computer program that executes processing for instructing the first terminal to send out a non-predictive video frame when a packet sent from the first terminal is lost and does not arrive at the server device Is provided.
- a server in which two or more terminals join to generate a group receive a stream including at least a video signal from the first terminal, copy it, and send it to terminals other than the first terminal
- a control function in the server it is possible to prevent the occurrence of image degradation on the terminal side.
- the above-mentioned effect is achieved without modifying the terminal side at all.
- the control function is installed in the server, thereby reducing the image degradation. It can be prevented from occurring on the side. According to the present invention, the above-mentioned effect is achieved without modifying the terminal side at all.
- Embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.
- an example of transmitting a video (moving image) signal will be described.
- FIG. 1 shows an example of a connection form of a server device and a mobile terminal in a mobile packet network.
- the number N of participating terminals of a group is 4 and four mobile terminals 120 to 123 form one group and is connected to the mobile packet network 130 is shown.
- the server device 150 is connected to the mobile packet network 130 and exchanges video packets with mobile terminals belonging to the group via the mobile packet network 130.
- the video PoC service and the video sharing service one of the mobile terminals 120 to 123 takes the initiative at a certain timing.
- the terminal having the initiative is referred to as a first terminal.
- a video stream or a packet storing the video stream is transmitted from the portable terminal (for example, 120) having the initiative to the server apparatus 150.
- the server apparatus determines which of the N terminals belongs to at a certain timing, SIP (Session Initiation Protocol) signal which is a call control signal from the terminal, or U-Plane signal. The determination is made using a certain RTCP (RTP Control Protocol) or the like.
- RTCP RTP Control Protocol
- SIP Session Initiation Protocol
- RTCP Real-Time Transport Protocol
- FIG. 2 is a diagram showing the configuration of an embodiment of the server apparatus 150 according to the present invention.
- the server device 150 includes a call control unit 151, a packet reception unit 155, a packet copy unit 156, a packet transmission unit 159, and a control packet generation / transmission unit 158.
- the terminal having the initiative gives information to the server apparatus using SIP.
- the initiative can also be transmitted to the server apparatus using means other than SIP (for example, RTCP).
- the call control unit 151 receives the number (N) of mobile terminals belonging to the same group and the IP address (or telephone number) of each mobile terminal by the SIP signal from the mobile terminal, and information (IP address of terminals having initiative in the same group) Or, information such as the participation timing of each mobile terminal to the group, a session start instruction, a session disconnection instruction, etc. is received. Also, it receives the capability information of each mobile terminal using SDP (Session Description Protocol). The details of SDP can be referred to IETF RFC 2327 here.
- operation (1) the operation in the case where all the N mobile terminals participate in the group at the start of the session and the mobile terminals do not participate in the middle of the session.
- the call control unit 151 When the call control unit 151 receives a session start instruction by SIP, the call control unit 151 instructs the packet reception unit 155 to receive an RTP packet from a mobile terminal (in this case, 120) having the initiative, and transmits the mobile terminal 120 Notify the former IP address.
- the packet receiving unit 155 receives the RT packet sent from the transmission source IP address, and outputs the RT packet to the packet copying unit 156.
- the call control unit 151 instructs the packet copying unit 156 because there are no portable terminals participating in the middle of the session, and the packet copying unit 156 is for all RTP packets input from the packet receiving unit 155 other than the portable terminals having initiative.
- the number of terminals (N-1) is copied and output to the packet transmission unit 159.
- the packet sending unit 159 is notified of the start instruction from the call control unit 151 and the IP addresses of the N-1 portable destination mobile terminals, and receives N-1 copy RTP packets input from the packet copying unit 156, Each is sent to N-1 mobile terminals.
- operation (2) an operation when the mobile terminal newly joins in the middle of the session.
- operation (1) an operation when the mobile terminal newly joins in the middle of the session.
- the call control section 151 When there is a portable terminal that has newly joined the group in the middle of a session, the call control section 151 receives a SIP signal for connection from the portable terminal, and thus the call control section 151 has a halfway participation terminal Recognize
- the call control unit 151 issues an instruction to the control packet generation / transmission unit 158 when receiving the SIP signal from the new terminal.
- the control packet generation / transmission unit 158 generates a control packet for transmitting a non-prediction (Intra) video frame (abbreviated as I frame), and the mobile terminal having the initiative (first terminal: the mobile terminal 120 here) Sends out the control packet.
- the control performed by the call control unit 151 and the control packet generation / transmission unit 158 corresponds to the processing of the control unit of claim 1.
- the mobile terminal having the initiative receives and analyzes the control packet, and then transmits a packet including an I frame to the server device 150.
- various methods such as a method of storing a control signal in an RTP header, a method of storing a control signal in an RTP payload, etc. can be considered. Use the method used. Other methods can also be used.
- the operations of the packet copying unit 156 and the packet sending unit 159 are the same as the operation of (1) above.
- the operation of the server apparatus corresponds to the first embodiment of the communication method of the present invention. That is, in this communication method, a plurality of terminals join to generate a group, and a stream or packet including at least a video signal transmitted from a first terminal (for example, 120) among the plurality of terminals is a server apparatus (150) Is received, the server apparatus (150) copies a part or all of the received stream or packet, and the copied stream or packet to a terminal different from the first terminal among the plurality of terminals Sending out. Furthermore, the server apparatus (150) transmits a non-predictive video frame to the first terminal when a new terminal joins the group while transmitting the copied stream or packet. Including the step of instructing to
- each unit of the server device 150 (in FIG. 2, the call control unit 151, the packet reception unit 155, the packet copy unit 156, the control packet generation / transmission unit 158, and the packet transmission unit 159)
- the processing and functions may be realized by a program executed in
- FIG. 3 is a diagram showing the configuration of the second embodiment of the present invention.
- a quality information collecting unit 157 is added to the configuration of FIG.
- the same components as in FIG. 2 are assigned the same reference numerals.
- the components having the same reference numerals as those in FIG. 2 perform the same operations as those in FIG.
- the quality information collection unit 157 checks, for all RTP packets received by the packet reception unit 155, using the sequence number (SN) stored in the RTP header whether or not the SN changes continuously.
- the control packet generation / transmission unit 165 is instructed to generate a control packet for transmitting a non-predictive (Intra) video frame (abbreviated as I frame), and the initiative is taken.
- the control packet is transmitted to the right portable terminal (first terminal: in this case, the portable terminal 120).
- the control performed by the quality information collection unit 157 and the control packet generation / transmission unit 165 corresponds to the processing of the control unit of claim 2.
- control signal for transmitting the I frame to the mobile terminal (first terminal) having the initiative is transmitted as a packet to the first terminal.
- the control signal may also be sent to the first terminal as
- details of the SIP Info method can be referred to IETF RFC 2976 or the like.
- the above embodiment does not depend on the method of compression encoding video, and the H.264 method is not used.
- Any compression coding method such as H.264 can be supported.
- the call control unit that is C-Plane (Control-Plane) processing the packet receiving unit that is U-Plane (User-Plane) processing, the conversion unit, the packet sending unit, etc.
- the C-Plane processing and the U-Plane processing may be separated into separate devices. According to this configuration, C-Plane and U-Plane can have scalability independently.
- the operation of the server apparatus corresponds to the second embodiment of the communication method of the present invention. That is, in this communication method, a plurality of terminals join to generate a group, and a stream or packet including at least a video signal transmitted from a first terminal (for example, 120) among the plurality of terminals is a server apparatus (150) Is received, the server apparatus (150) copies a part or all of the received stream or packet, and the copied stream or packet to a terminal different from the first terminal among the plurality of terminals Sending out. Furthermore, when the packet sent from the first terminal (120) is lost and does not arrive at the server device (150), the server device (150) is configured to receive the first terminal (120). And C.) to send out non-predictive video frames.
- the respective units of the server apparatus 150 (in FIG. 3, the call control unit 151, the packet receiving unit 155, the packet copying unit 156, the quality information collecting unit 157, the control packet generation / transmission unit 165, the packet transmission unit 159)
- the processing / functions may be realized by a program executed on a computer constituting 150.
- server apparatus 150 may be configured to have the configurations of the first and second embodiments.
- two or more terminals join to generate a group, receive a stream including at least a video signal from the first terminal, copy it, and send it to terminals other than the first terminal
- the server apparatus by installing the control function in the server, even for a terminal that has participated halfway, it is possible to prevent the deterioration of the image on the terminal side without modifying the terminal side at all.
- the terminal side can be implemented by mounting the control function in the server. It is possible to prevent the degradation of the image on the terminal side without remodeling.
Abstract
Description
本発明は、日本国特許出願:特願2008-142745号(2008年5月30日出願)の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は、サーバ装置と通信方法に関し、特に、少なくとも2台の端末が参加してグループを生成し、第1の端末からビデオ信号を含むストリームまたはパケットを受信し、これをコピーした上で第1の端末以外の他の端末に送出するサーバ装置と通信方法ならびにプログラムに関する。
以下に本発明による関連技術の分析を与える。
前記サーバ装置は前記受信したストリームまたはパケットの一部または全部をコピーし、前記複数の端末のうち前記第1の端末とは異なる端末に、前記コピー後のストリームまたはパケットを送出し、
前記サーバ装置は、前記送出している途中で新規端末が前記グループに参加した場合に、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す通信方法が提供される。
前記サーバ装置は前記受信したストリームまたはパケットの一部または全部をコピーし、前記複数の端末のうち前記第1の端末とは異なる端末に、前記コピー後のストリームまたはパケットを送出し、
前記第1の端末から送出されたパケットが紛失して前記サーバ装置に到着しない場合には、前記サーバ装置は、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す通信方法が提供される。
前記送出している途中で新規端末が前記グループに参加した場合に、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す処理を実行させるコンピュータ・プログラムが提供される。
前記第1の端末から送出されたパケットが紛失して前記サーバ装置に到着しない場合は、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す処理を実行させるコンピュータ・プログラムが提供される。
130 モバイルパケットネットワーク
150 サーバ装置
151 呼制御部
155 パケット受信部
156 パケットコピー部
157 品質情報収集部
158、165 制御パケット生成・送出部
159 パケット送出部
図2は、本発明によるサーバ装置150の実施例の構成を示す図である。サーバ装置150は、呼制御部151、パケット受信部155、パケットコピー部156、パケット送出部159、制御パケット生成・送出部158を備えている。
図3は、本発明の第2の実施例の構成を示す図である。本実施例では、図2の構成に品質情報収集部157が追加されている。図3において、図2と同じ構成要素には同一の参照番号を付している。図2と同一参照番号の構成要素は図2と同一の動作を行なうので説明を省略する。
Claims (9)
- 複数の端末が参加してグループを生成し、前記複数の端末のうち第1の端末から送出された少なくともビデオ信号を含むストリームまたはパケットを受信し、前記受信したストリームまたはパケットの一部または全部をコピーし、前記複数の端末のうち前記第1の端末とは異なる端末に、前記コピー後のストリームまたはパケットを送出するサーバ装置であって、
前記送出している途中で新規端末が前記グループに参加した場合には、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す制御部を備える、ことを特徴とするサーバ装置。 - 前記第1の端末から送出されたパケットが紛失して前記サーバ装置に到着しない場合には、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す制御部を備える、ことを特徴とする請求項1記載のサーバ装置。
- 複数の端末が参加してグループを生成し、前記複数の端末のうち第1の端末から送出された少なくともビデオ信号を含むストリームまたはパケットを受信し、前記受信したストリームまたはパケットの一部または全部をコピーし、前記複数の端末のうち前記第1の端末とは異なる端末に、前記コピー後のストリームまたはパケットを送出するサーバ装置であって、
前記第1の端末から送出されたパケットが紛失して前記サーバ装置に到着しない場合には、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す制御部を備える、ことを特徴とするサーバ装置。 - 複数の端末が参加してグループを生成し、前記複数の端末のうち第1の端末から送出された少なくともビデオ信号を含むストリームまたはパケットをサーバ装置が受信し、
前記サーバ装置は前記受信したストリームまたはパケットの一部または全部をコピーし、前記複数の端末のうち前記第1の端末とは異なる端末に、前記コピー後のストリームまたはパケットを送出し、
前記サーバ装置は、前記送出している途中で新規端末が前記グループに参加した場合に、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す、ことを特徴とする通信方法。 - 前記第1の端末から送出されたパケットが紛失して前記サーバ装置に到着しない場合には、前記サーバ装置は、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す、ことを特徴とする請求項4記載の通信方法。
- 複数の端末が参加してグループを生成し、前記複数の端末のうち第1の端末から送出された少なくともビデオ信号を含むストリームまたはパケットをサーバ装置が受信し、
前記サーバ装置は前記受信したストリームまたはパケットの一部または全部をコピーし、前記複数の端末のうち前記第1の端末とは異なる端末に、前記コピー後のストリームまたはパケットを送出し、
前記第1の端末から送出されたパケットが紛失して前記サーバ装置に到着しない場合には、前記サーバ装置は、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す、ことを特徴とする通信方法。 - 複数の端末が参加してグループを生成し、前記複数の端末のうち第1の端末から送出された少なくともビデオ信号を含むストリームまたはパケットを受信し、前記受信したストリームまたはパケットの一部または全部をコピーし、前記複数の端末のうち前記第1の端末とは異なる端末に、前記コピー後のストリームまたはパケットを送出するサーバ装置に、
前記送出している途中で新規端末が前記グループに参加した場合に、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す処理を実行させるプログラム。 - 前記第1の端末から送出されたパケットが紛失して前記サーバ装置に到着しない場合は、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す処理を実行させる請求項7記載のプログラム。
- 複数の端末が参加してグループを生成し、前記複数の端末のうち第1の端末から送出された少なくともビデオ信号を含むストリームまたはパケットを受信し、前記受信したストリームまたはパケットの一部または全部をコピーし、前記複数の端末のうち前記第1の端末とは異なる端末に、前記コピー後のストリームまたはパケットを送出するサーバ装置に、
前記第1の端末から送出されたパケットが紛失して前記サーバ装置に到着しない場合は、前記第1の端末に対して、非予測ビデオフレームを送出するよう指示を出す処理を実行させるプログラム。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010514549A JPWO2009145294A1 (ja) | 2008-05-30 | 2009-05-29 | サーバ装置と通信方法ならびにプログラム |
US12/995,163 US20110075570A1 (en) | 2008-05-30 | 2009-05-29 | Server apparatus, communication method and program |
CN200980119132.3A CN102047675A (zh) | 2008-05-30 | 2009-05-29 | 服务器装置和通信方法以及程序 |
EP09754802A EP2290978A1 (en) | 2008-05-30 | 2009-05-29 | Server device, communication method, and program |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008142745 | 2008-05-30 | ||
JP2008-142745 | 2008-05-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009145294A1 true WO2009145294A1 (ja) | 2009-12-03 |
Family
ID=41377163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/059855 WO2009145294A1 (ja) | 2008-05-30 | 2009-05-29 | サーバ装置と通信方法ならびにプログラム |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110075570A1 (ja) |
EP (1) | EP2290978A1 (ja) |
JP (1) | JPWO2009145294A1 (ja) |
CN (1) | CN102047675A (ja) |
WO (1) | WO2009145294A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102510470B (zh) * | 2011-09-28 | 2015-04-15 | 杭州华三通信技术有限公司 | 一种媒体流数据复制方法和设备 |
JP6066561B2 (ja) * | 2012-01-26 | 2017-01-25 | キヤノン株式会社 | 映像処理装置、映像処理方法およびプログラム |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001285390A (ja) | 2000-03-02 | 2001-10-12 | Matsushita Electric Ind Co Ltd | 非信頼ネットワークにおけるデータ伝送方法及び装置 |
JP2002305733A (ja) * | 2001-04-06 | 2002-10-18 | Matsushita Electric Ind Co Ltd | マルチキャスト会議装置、及びマルチキャスト会議プログラム |
JP2002314972A (ja) * | 2001-04-09 | 2002-10-25 | Nec Corp | 配信システムとその配信方法、及び配信プログラム |
WO2003041408A1 (fr) * | 2001-11-05 | 2003-05-15 | Matsushita Electric Industrial Co., Ltd. | Terminal utilise dans un systeme de transmission video |
JP2005124193A (ja) | 2003-10-10 | 2005-05-12 | Microsoft Corp | 高速チャネル変更 |
JP2007053487A (ja) * | 2005-08-16 | 2007-03-01 | Nec Corp | 発言権管理システム、発言権管理方法、及びプログラム |
JP2007068078A (ja) * | 2005-09-02 | 2007-03-15 | Sharp Corp | 通信システム、携帯端末、サーバおよび通信方法 |
JP2007235278A (ja) * | 2006-02-27 | 2007-09-13 | Kyocera Corp | グループ通信制御方法、通信端末及び通信システム |
JP2008504767A (ja) | 2004-07-01 | 2008-02-14 | オーワイ ゲームクラスター リミテッド | 予測および非予測データフレームを伝送するための方法および装置 |
JP2008142745A (ja) | 2006-12-11 | 2008-06-26 | Sumitomo Metal Ind Ltd | 溶融金属の連続鋳造方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6477150B1 (en) * | 2000-03-03 | 2002-11-05 | Qualcomm, Inc. | System and method for providing group communication services in an existing communication system |
JP3579335B2 (ja) * | 2000-08-23 | 2004-10-20 | 日本電信電話株式会社 | ストリーム配信装置 |
JP2006279559A (ja) * | 2005-03-29 | 2006-10-12 | Yamaha Corp | 送信装置、受信装置およびプログラム |
US20080100694A1 (en) * | 2006-10-27 | 2008-05-01 | Microsoft Corporation | Distributed caching for multimedia conference calls |
US20080115185A1 (en) * | 2006-10-31 | 2008-05-15 | Microsoft Corporation | Dynamic modification of video properties |
US8233023B2 (en) * | 2007-01-06 | 2012-07-31 | Samsung Electronics Co., Ltd | Method and apparatus for controlling intra-refreshing in a video telephony communication system |
JP2008193500A (ja) * | 2007-02-06 | 2008-08-21 | Canon Inc | データ送信装置及びデータ中継装置 |
US8208003B2 (en) * | 2007-03-23 | 2012-06-26 | Cisco Technology, Inc. | Minimizing fast video update requests in a video conferencing system |
-
2009
- 2009-05-29 US US12/995,163 patent/US20110075570A1/en not_active Abandoned
- 2009-05-29 WO PCT/JP2009/059855 patent/WO2009145294A1/ja active Application Filing
- 2009-05-29 JP JP2010514549A patent/JPWO2009145294A1/ja not_active Ceased
- 2009-05-29 CN CN200980119132.3A patent/CN102047675A/zh active Pending
- 2009-05-29 EP EP09754802A patent/EP2290978A1/en not_active Withdrawn
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001285390A (ja) | 2000-03-02 | 2001-10-12 | Matsushita Electric Ind Co Ltd | 非信頼ネットワークにおけるデータ伝送方法及び装置 |
JP2004289868A (ja) | 2000-03-02 | 2004-10-14 | Matsushita Electric Ind Co Ltd | 非信頼ネットワークにおけるデータ伝送方法及び装置 |
JP2002305733A (ja) * | 2001-04-06 | 2002-10-18 | Matsushita Electric Ind Co Ltd | マルチキャスト会議装置、及びマルチキャスト会議プログラム |
JP2002314972A (ja) * | 2001-04-09 | 2002-10-25 | Nec Corp | 配信システムとその配信方法、及び配信プログラム |
WO2003041408A1 (fr) * | 2001-11-05 | 2003-05-15 | Matsushita Electric Industrial Co., Ltd. | Terminal utilise dans un systeme de transmission video |
JP2005124193A (ja) | 2003-10-10 | 2005-05-12 | Microsoft Corp | 高速チャネル変更 |
JP2008504767A (ja) | 2004-07-01 | 2008-02-14 | オーワイ ゲームクラスター リミテッド | 予測および非予測データフレームを伝送するための方法および装置 |
JP2007053487A (ja) * | 2005-08-16 | 2007-03-01 | Nec Corp | 発言権管理システム、発言権管理方法、及びプログラム |
JP2007068078A (ja) * | 2005-09-02 | 2007-03-15 | Sharp Corp | 通信システム、携帯端末、サーバおよび通信方法 |
JP2007235278A (ja) * | 2006-02-27 | 2007-09-13 | Kyocera Corp | グループ通信制御方法、通信端末及び通信システム |
JP2008142745A (ja) | 2006-12-11 | 2008-06-26 | Sumitomo Metal Ind Ltd | 溶融金属の連続鋳造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN102047675A (zh) | 2011-05-04 |
JPWO2009145294A1 (ja) | 2011-10-13 |
US20110075570A1 (en) | 2011-03-31 |
EP2290978A1 (en) | 2011-03-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8180915B2 (en) | Coding data streams | |
EP2521298B1 (en) | Method and apparatus for ensuring quality of service of internet protocol television live broadcast service | |
US8503538B2 (en) | Method, apparatus, system, and program for content encoding, content distribution, and content reception | |
US7667729B2 (en) | Multi-point conference system and multi-point conference device | |
US20020191594A1 (en) | Transmitting/receiving method and device therefor | |
EP2566128B1 (en) | Method and server for obtaining key information during fast channel switching | |
US8213506B2 (en) | Video coding | |
CN101316357A (zh) | 一种频道切换的方法、终端和媒体服务器 | |
JP2011010356A (ja) | 画像データ配信制御方法及び装置とシステムならびにプログラム | |
US9386273B1 (en) | Video multicast engine | |
EP1554812B1 (en) | System and method for providing error recovery for streaming fgs encoded video over an ip network | |
JPWO2004071089A1 (ja) | 画像データ配信制御方法及び装置とシステムならびにプログラム | |
JP5257448B2 (ja) | サーバ装置と通信方法ならびにプログラム | |
WO2009145294A1 (ja) | サーバ装置と通信方法ならびにプログラム | |
US7627184B2 (en) | Content distribution/reception device, content transmission/reception method, and content distribution/reception program | |
JP2002152301A (ja) | データ通信システム、データ受信装置、データ通信方法、並びにプログラム記憶媒体 | |
JP4596164B2 (ja) | 画像データ通信システムおよび画像データ通信方法 | |
JP2007150755A (ja) | データ送信装置及び方法 | |
JP4960392B2 (ja) | 通信装置、通信方法、及び通信プログラム | |
WO2010035776A1 (ja) | サーバ装置及び通信システムと通信方法とプログラム | |
Wang et al. | Mobile video applications and standards | |
Schierl et al. | Improving P2P live-content delivery using SVC |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200980119132.3 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09754802 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010514549 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12995163 Country of ref document: US Ref document number: 2009754802 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |