WO2016002747A1 - Dispositif de transmission de contenu - Google Patents

Dispositif de transmission de contenu Download PDF

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Publication number
WO2016002747A1
WO2016002747A1 PCT/JP2015/068765 JP2015068765W WO2016002747A1 WO 2016002747 A1 WO2016002747 A1 WO 2016002747A1 JP 2015068765 W JP2015068765 W JP 2015068765W WO 2016002747 A1 WO2016002747 A1 WO 2016002747A1
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WO
WIPO (PCT)
Prior art keywords
content
unit
client
segment
server
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Application number
PCT/JP2015/068765
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English (en)
Japanese (ja)
Inventor
琢也 岩波
渡部　秀一
徳毛　靖昭
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シャープ株式会社
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Publication of WO2016002747A1 publication Critical patent/WO2016002747A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—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
    • 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
    • H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
    • 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

Definitions

  • the present invention relates to a content transmission apparatus that transmits content.
  • VOD Video On Demand
  • data is transmitted and received between a server (content providing apparatus) and a client (content reproducing apparatus) using HTTP (HyperText Transfer Protocol).
  • MPEG Motion Picture Experts Group
  • MPEG-DASH Dynamic Adaptive Streaming over HTTP
  • content is time-divided into a plurality of segments and transmitted in segment units.
  • Each segment is composed of one or a plurality of fragments.
  • the content is composed of one or a plurality of periods, and one period includes one or a plurality of segments.
  • a plurality of representations having different quality types are prepared for one content. For example, a plurality of segment data encoded at different bit rates for each segment is prepared. Accordingly, a client that receives and reproduces content can execute adaptive streaming by changing the bit rate of the requested content (segment) in accordance with the reception status of the content.
  • MPD Media Presentation Description
  • MPD is content metadata and describes content management information in XML format.
  • MPD is information used by the client when acquiring / reproducing content.
  • FIG. 5 is a diagram illustrating a description example of MPD.
  • the MPD 200 describes acquisition destination information 201 indicating a content acquisition destination. More specifically, in the example shown in FIG. 5, the URL of the server is described as the acquisition source information 201.
  • URLs of two servers cdn1 and cdn2 are described, and the client can select a content acquisition destination by referring to the MPD 200 as described above.
  • high-quality segment information 202 indicating a high-quality segment and low-quality segment information 203 indicating a low-quality segment are described as segments included in a certain period (from reproduction time 0 seconds to 600 seconds).
  • the high quality segment information 202 describes the ID and bit rate of the high quality representation included in the period.
  • the length and URL of each segment included in the period are described. The same applies to the low quality segment information 203.
  • the period is composed of 60 segments from the first segment to the 60th segment.
  • FIG. 6 is a diagram illustrating an example of an operation sequence in the case of switching the quality type of content acquired based on the content reception status.
  • FIG. 7 is a diagram illustrating an example of an HTTP message when the quality type of content acquired based on the content reception status is switched.
  • the MPD 200 shown in FIG. 5 is associated with the content, and the client 302 receives a high quality Representation (rep1) or a low quality Representation (rep2) from the server (cdn1) 301 according to the reception status. Shall be acquired.
  • the client 302 refers to the MPD 200 and transmits a request message 311 for requesting transmission of the Nth segment of high quality representation to the server 301.
  • the server 301 transmits a response message 312 including the data body of the Nth segment of high quality representation to the client 302.
  • the client 302 when the client 302 detects the deterioration of the reception status when receiving the Nth segment of the high quality representation (process 313), the client 302 searches for an alternative representation with reference to the MPD 200 (process 314).
  • the client 302 since the low quality representation (rep2) is described as an alternative representation in the MPD 200, the client 302 refers to the MPD 200 and requests the server 301 to transmit the (N + 1) th segment of the low quality representation.
  • a request message 315 is transmitted to the server 301.
  • the server 301 transmits a response message 316 including the data body of the (N + 1) th segment of the low quality representation to the client 302.
  • the client measures the content reception bandwidth status for a limited network bandwidth, and requests the server for the quality of received content (such as bit rate) based on the measurement result.
  • the quality of receivable content is biased depending on the client request timing and the quality determination algorithm.
  • the present invention has been made in view of the above problems, and its purpose is to notify the server of subjective evaluation data relating to the resolution and smoothness of movement perceived by the user on the client side.
  • the content transmission device is a content transmission device that transmits content composed of a plurality of segments to the content reproduction device for each segment, and each segment from the content reproduction device.
  • a transmission unit that transmits a response including the segment to the content reproduction device, a processing unit that processes subjective evaluation data acquired from the client, and a processing amount measured by the processing unit In the case where the value is equal to or greater than the predetermined value, the content is generated again.
  • the content transmission apparatus is characterized in that the subjective evaluation data is added to the header of the request in order to solve the above problem.
  • FIG. 1 showing an embodiment of the present invention, is a block diagram illustrating an example of a configuration of a content distribution system.
  • FIG. 1 showing an embodiment of the present invention, is another block diagram illustrating an example of a configuration of a content distribution system.
  • FIG. It is a figure which shows an example of the syntax of event information. It is another figure which shows an example of the syntax of event information. It is a figure which shows the example of description of MPD. It is a figure which shows an example of the operation
  • FIGS. 1 to 4 An embodiment of the present invention will be described with reference to FIGS. 1 to 4 as follows. First, an outline of the content distribution system of the present embodiment will be described based on FIG.
  • FIG. 1 is a diagram showing an outline of a content distribution system 1 according to the present embodiment.
  • the content distribution system 1 includes a server 100, a client 110, an imaging unit 105, and a display unit 116.
  • the client 110 is connected to the server 100 via a network.
  • Each device is connected by an arbitrary network of wired communication or wireless communication.
  • the configuration of the content distribution system 1 is not limited to the example shown in FIG.
  • the content distribution system 1 may include two or more servers 100 and may include two or more clients 110.
  • the content distribution system 1 may include a proxy (not shown) between the server 100 and the client 110.
  • HTTP which is widely used as a hypertext transfer protocol
  • the content distributed by the server 100 is video content, and the content is segmented ISOBFF data. That is, in the present embodiment, the content distribution system 1 distributes content based on the above-described MPEG-DASH standard.
  • FIG. 1 is a diagram illustrating an example of a main configuration of the server 100 and the client 110.
  • the server 100 includes an encoding unit 101, a sending unit 102, a receiving unit 103, and a totaling / processing unit 104.
  • the encoding unit 101 encodes video and audio data input from the imaging unit 105.
  • the sending unit 102 communicates with the client 110 by wireless communication means or wired communication means, and exchanges data in accordance with instructions from the server 100.
  • the receiving unit 103 communicates with the client 110 by wireless communication means or wired communication means, and exchanges data according to instructions from the client 110.
  • the tabulation / processing unit 104 tabulates user subjective evaluation data received by the receiving unit 103.
  • the aggregation / processing unit 104 corrects the encoding parameter and outputs the corrected correction parameter to the encoding unit 101.
  • the aggregation / processing unit 104 does not correct the encoding parameter and does not output to the encoding unit 101.
  • the aggregation / processing unit 104 may generate the content of the encoding parameter according to the processing amount notified by the receiving unit 103.
  • the client 110 is a content reproduction device that reproduces content acquired from another device such as the server 100 or content stored in the device itself.
  • the client 110 is, for example, a digital television, a recorder, an STB (Set Top Box), a PC, a mobile phone, a game machine, a PDA (Personal Digital Assistant), a digital camera, a digital video, or the like.
  • the client 110 includes a receiving unit 111, a decoding / reproducing unit 112, an input unit 113, a metrics generation unit 114, and a transmission unit 115.
  • the receiving unit 111 acquires segment data based on an instruction from the sending unit 102.
  • the receiving unit 111 outputs the acquired segment data to the decoding / reproducing unit 112. Note that the receiving unit 111 may acquire segment data regardless of whether there is an instruction from the sending unit 102.
  • the decoding / reproducing unit 112 decodes the video data input from the receiving unit 111 and reproduces it.
  • the input unit 113 is for the user to input an instruction signal to the client 110.
  • the input unit 113 may be configured with input devices such as a keyboard, a mouse, a keypad, and operation buttons. Further, a touch panel in which the input unit 113 and the display unit 116 are integrated may be used.
  • the input unit 113 may be a remote control device such as a remote controller that is separate from the client 110.
  • the input unit 113 may be a gesture recognition device that recognizes a user's gesture.
  • the display unit 116 is for receiving a video signal from the decoding / reproducing unit 112 and displaying the video.
  • a video signal from the decoding / reproducing unit 112 and displaying the video.
  • an LCD liquid crystal display
  • organic EL display organic EL display
  • a plasma display or the like can be applied.
  • the metrics generation unit 114 When the metrics generation unit 114 receives the subjective evaluation information from the input unit 113, the metrics generation unit 114 notifies the transmission unit 115 of the correspondence between the subjective evaluation type and the subjective evaluation value indicated by the received subjective evaluation information.
  • the metrics generation unit 114 determines whether or not the user event indicated by the received subjective evaluation information matches the subjective evaluation type in the metrics generation unit 114. . When it is determined that the user event indicated by the received subjective evaluation information matches the subjective evaluation type in the metrics generation unit 114, the subjective evaluation information including the subjective evaluation type and the subjective evaluation value corresponding to the matched user event is used as event information.
  • the data is transmitted to the server 100 via the sending unit 115. Details of the event information will be described later.
  • the metrics generation unit 114 waits for a user event indicating subjective evaluation information to be input from the input unit 113, detects a user event indicating subjective evaluation information, and sets the subjective evaluation type corresponding to the detected user event.
  • Subjective evaluation information including the subjective evaluation value is transmitted to the server 100 via the sending unit 115.
  • the metrics generation unit 114 performs processing corresponding to the input user event based on a rule predetermined in the client 110. May be executed.
  • the Metrics generation unit 114 may invalidate the input user event when a user event other than the user event indicated by the subjective evaluation information is input from the input unit 113.
  • the sending unit 115 communicates with the server 100 by wireless communication means or wired communication means, and exchanges subjective evaluation information generated by the metrics generation unit 114.
  • FIG. 2 is a diagram illustrating an example of a main configuration of the server 200 and the client 210.
  • the server 200 is a content transmission device that receives a request message (request) requesting transmission of content from the client 210 and transmits a response message (response) to the received request message. Specifically, when a request for requesting transmission of content management information (MPD) is received from the client 210, a response including the MPD of the content is transmitted to the client 210. Further, when a request for transmitting a segment constituting the content is received from the client 210, a response including the segment is transmitted to the client 210.
  • MPD content management information
  • the server 200 includes an encoding unit 201, a sending unit 202, a receiving unit 203, a totaling / processing unit 204, and a distribution information generating unit 205.
  • the encoding unit 201 encodes the video data input from the imaging unit 105. At this time, if an encoding parameter is input from the totalization / processing unit 104, the video or audio data is encoded according to the input encoding parameter, sent to the sending unit 202, and encoded. Information on the generated content is sent to the distribution information generation unit 205.
  • the sending unit 202 communicates with the client 210 by wireless communication means or wired communication means, and exchanges data according to instructions from the server 100.
  • the sending unit 202 sends a response to the request to the client 210.
  • the receiving unit 203 receives a request for requesting transmission of content management information (MPD) from the client 210, it instructs the distribution information generating unit 205 to generate an MPD of the content, and the distribution information generating unit
  • MPD data is acquired from 205
  • a response including the acquired MPD data is transmitted to the client 210.
  • the sending unit 202 is instructed to acquire the segment, and a response including the segment data is transmitted to the client 210.
  • the receiving unit 203 communicates with the client 210 by wireless communication means or wired communication means, and exchanges data in accordance with instructions from the client 210. Specifically, the subjective evaluation information acquired from the sending unit 215 of the client 210 is not only sent to the aggregation / processing unit 204, but also the MPD acquisition request acquired from the sending unit 215 of the client 210 is sent to the sending unit 202.
  • the tabulation / processing unit 204 tabulates the user's subjective evaluation data received by the receiving unit 203.
  • the aggregation / processing unit 204 corrects the encoding parameter and outputs it to the encoding unit 201.
  • the aggregation / processing unit 204 does not correct the encoding parameter and does not output to the encoding unit 201.
  • the aggregation / processing unit 204 may send the aggregated subjective evaluation data to the distribution information generation unit 205, and in this case, the distribution information generation unit 205 may use it as reference information when creating the MPD. Good.
  • the distribution information generation unit 205 creates an MPD based on the content information input from the encoding unit 201 and sends it to the sending unit 202.
  • the subjective evaluation data input from the tabulation / processing unit 204 may be referred to.
  • the receiving unit 211 acquires segment data based on an instruction from the sending unit 202.
  • the receiving unit 211 outputs the acquired segment data to the decoding / reproducing unit 212.
  • the reception unit 211 may acquire segment data regardless of whether there is an instruction from the transmission unit 202.
  • the decoding / reproducing unit 212 decodes the video data input from the receiving unit 111 and reproduces it.
  • the sending unit 215 communicates with the server 100 by wireless communication means or wired communication means, and exchanges subjective evaluation information generated by the metrics generation unit 114.
  • a request is transmitted from the transmission unit 215 to the server 200, and content (an MPD associated with the content and a segment constituting the content) is acquired from the server 200.
  • the transmission unit 215 transmits a request for requesting transmission of management information (MPD) of the content to the server 200.
  • MPD management information
  • the receiving unit 211 receives the MPD data of the content as a response to the request.
  • the received MPD data is referred to by the distribution information processing unit 217, and a request for requesting transmission of the segments constituting the content is transmitted to the server 200 via the transmission unit.
  • the reception unit 211 acquires the segment data of the content as a response to the request.
  • the acquired segment data is output to the decoding / reproducing unit 212.
  • the distribution information processing unit 217 refers to the MPD input from the reception unit 211 and sends a request for transmission of a segment constituting the content to the transmission unit 215.
  • ⁇ event information ⁇ 3 and 4 are diagrams showing examples of event information syntax, respectively.
  • the sensation (“subjective_score”), resolution (“sublective_score_resolutional”), and motion blur (“subjective_score_bluring”) received from the entire content are set as the subjective evaluation types. Further, five levels from 5 (excellent) to 1 (poor) are set as subjective evaluation values.
  • FIG. 4 is another example showing the subjective evaluation types and subjective evaluation values described in FIG.
  • the server 200 waits for a request from the client 210 to be transmitted.
  • the reception unit 203 receives a request for requesting transmission of content management information (MPD) from the client 210
  • the reception unit 203 associates the distribution information generation unit 205 with the content indicated by the received request. Instruct to obtain the MPD.
  • MPD content management information
  • the distribution information generation unit 205 Upon receiving the instruction from the reception unit 203, the distribution information generation unit 205 acquires the MPD data from the encoding unit, obtains the MPD data, creates the MPD, and outputs the MPD data to the transmission unit 202. Then, the transmission unit 202 transmits a response including the MPD data acquired from the distribution information generation unit 205 to the client 210.
  • the receiving unit 203 When the receiving unit 203 receives a request for transmitting a segment from the client 210, the receiving unit 203 instructs the sending unit 202 to transmit the segment indicated by the request.
  • the receiving unit 203 acquires event information related to subjective evaluation information from the client 210, the receiving unit 203 totals it in the totaling / processing unit 204 and outputs the encoding parameters to the encoding unit 201.
  • the aggregation / processing unit 204 counts the number of subjective evaluation values for each subjective evaluation type.
  • the encoding unit instructs the encoding parameter of the content to increase the frame rate from the current level while reducing the resolution.
  • 201 is notified.
  • the encoding unit 201 performs content encoding processing based on the acquired encoding parameter, transmits video data to the transmission unit 202, and transmits parameter information to the distribution information generation unit 205.
  • the distribution information generation unit 205 updates the MPD and transmits it to the transmission unit 202.
  • the sending unit 202 sends the updated video data and MPD to the client 210 via the network.
  • the processing variation of the server 200 is not limited to the above.
  • the server 200 may distribute a message for acquiring an MPD describing different acquisition destination information to each client owned by a plurality of users.
  • each client may acquire the MPD from the address described in the message, and may further acquire the content from the address described in the MPD.
  • the server 200 controls the content acquisition destination for each client, thereby realizing data acquisition while suppressing congestion on the network.
  • the content is regenerated based on the subjective evaluation from the user, thereby realizing the content satisfying the user while suppressing the network load.
  • the blocks of the servers 100 and 200 and the clients 110 and 210 may be configured by hardware logic, or may be realized by software using a CPU as follows.
  • the servers 100 and 200 and the clients 110 and 210 include a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, and a RAM that expands the program. (Randomaccess memory), a storage device (recording medium) such as a memory for storing the program and various data.
  • An object of the present invention is a recording medium in which program codes (execution format program, intermediate code program, source program) of control programs for the server 1 and the client 2 which are software for realizing the functions described above are recorded so as to be readable by a computer. This can also be achieved by supplying the above to the servers 100 and 200 and the clients 110 and 210, and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).
  • Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R.
  • Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM (registered trademark) / flash ROM.
  • the server 1 and the client 2 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network.
  • the communication network is not particularly limited.
  • the Internet intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available.
  • the transmission medium constituting the communication network is not particularly limited.
  • infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used.
  • the present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.
  • the present invention can be used for a content transmission device that transmits content of the MPEG-DASH standard and a content playback device that acquires and plays back the content.

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

Abstract

L'invention concerne un dispositif de transmission de contenu qui reproduit et distribue un contenu et qui améliore la qualité tout en supprimant une bande passante de réseau, en permettant à un utilisateur côté client de rapporter, à un serveur, des données d'évaluation subjectives concernant la résolution et la souplesse perçues d'un mouvement par rapport à un contenu, et par agrégation des données obtenues par le serveur. Le dispositif de transmission de contenu de la présente invention, qui transmet un contenu comprenant de multiples segments à un dispositif de reproduction de contenu segment par segment, est caractérisé par une unité de transmission qui, en tant que réponse à une requête provenant du dispositif de reproduction de contenu demandant la transmission de chaque segment, transmet au dispositif de reproduction de contenu une réponse contenant les segments pertinents, et une unité de traitement qui traite les données d'évaluation subjectives obtenues à partir du client, le contenu étant reproduit à nouveau lorsqu'une quantité de traitement mesurée par l'unité de traitement est égale ou supérieure à une valeur prescrite.
PCT/JP2015/068765 2014-07-01 2015-06-30 Dispositif de transmission de contenu WO2016002747A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014135903A JP2017152750A (ja) 2014-07-01 2014-07-01 コンテンツ送信装置
JP2014-135903 2014-07-01

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WO2016002747A1 true WO2016002747A1 (fr) 2016-01-07

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002204278A (ja) * 2000-10-31 2002-07-19 Toshiba Corp データ伝送装置およびデータ伝送方法
JP2007158623A (ja) * 2005-12-02 2007-06-21 Matsushita Electric Ind Co Ltd 映像配信サービスの品質モニタ方法および端末装置
WO2011010688A1 (fr) * 2009-07-22 2011-01-27 日本電気株式会社 Système de délivrance de contenu, procédé de délivrance de contenu et programme de délivrance de contenu

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002204278A (ja) * 2000-10-31 2002-07-19 Toshiba Corp データ伝送装置およびデータ伝送方法
JP2007158623A (ja) * 2005-12-02 2007-06-21 Matsushita Electric Ind Co Ltd 映像配信サービスの品質モニタ方法および端末装置
WO2011010688A1 (fr) * 2009-07-22 2011-01-27 日本電気株式会社 Système de délivrance de contenu, procédé de délivrance de contenu et programme de délivrance de contenu

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