WO2014177523A1 - Method and device for feeding a portion, which is already broadcast, of a multimedia stream, corresponding user terminal, computer program and storage medium - Google Patents

Method and device for feeding a portion, which is already broadcast, of a multimedia stream, corresponding user terminal, computer program and storage medium Download PDF

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Publication number
WO2014177523A1
WO2014177523A1 PCT/EP2014/058625 EP2014058625W WO2014177523A1 WO 2014177523 A1 WO2014177523 A1 WO 2014177523A1 EP 2014058625 W EP2014058625 W EP 2014058625W WO 2014177523 A1 WO2014177523 A1 WO 2014177523A1
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WIPO (PCT)
Prior art keywords
multimedia stream
user terminal
broadcast
stream
user
Prior art date
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PCT/EP2014/058625
Other languages
French (fr)
Inventor
David Vincent
Frédéric BEAUCHAMP
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Tdf
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Priority to FR1354066A priority Critical patent/FR3005386B1/en
Priority to FR1354066 priority
Application filed by Tdf filed Critical Tdf
Publication of WO2014177523A1 publication Critical patent/WO2014177523A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/239Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests
    • H04N21/2393Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests involving handling client requests
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/231Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/23106Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47End-user applications
    • H04N21/472End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47202End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47End-user applications
    • H04N21/472End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47217End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for controlling playback functions for recorded or on-demand content, e.g. using progress bars, mode or play-point indicators or bookmarks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/65Transmission of management data between client and server
    • H04N21/658Transmission by the client directed to the server
    • H04N21/6587Control parameters, e.g. trick play commands, viewpoint selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845Structuring of content, e.g. decomposing content into time segments
    • H04N21/8456Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments

Abstract

The invention relates to a method for feeding, to a user terminal, a portion that is already broadcast of a multimedia stream that is being broadcast in a digital broadcasting network, including a step of feeding said portion, by means of a remote server of said terminal, starting at a predetermined time position in said stream, via a communication network separate from said digital broadcasting network, including: a substep of receiving said stream and, for each received portion of said stream: encoding said received portion, feeding at least one independent content fragment; storing said fragment in a circular buffer memory area having a predetermined size; a substep of concatenating said fragments, starting with the fragment corresponding to said predetermined time position, feeding said portion of said stream in the form of a file to be downloaded by said terminal.

Description

 Method and apparatus for providing an already broadcast portion of a corresponding media stream, user terminal, computer program and storage medium.

 1. Field of the invention

 The field of the invention is that of the transmission and digital broadcasting of multimedia content, including television content.

 More specifically, the invention relates to the display, on a user terminal, of an already broadcast portion of a multimedia stream, from a predetermined time position in the stream, the latter being being broadcast in a network of digital broadcasting.

 The invention applies in particular, but not exclusively, to a multimedia stream conforming to DVB-T or DVB-T2 ("Digital Video Broadcasting - Terrestrial") broadcast standards for "digital terrestrial video broadcasting". ) and user terminals compatible with connected television type HbbTV ("Hybrid Broadcast Broadband TV" in English) for example.

 2. Prior Art

 There are now several solutions for (re) viewing, from a predetermined time (for example from its beginning), a video being broadcast or already broadcast.

 For example, there are so-called back-shifting solutions. A disadvantage of these solutions lies in the need to have active local equipment, already recording the chain on which we want to go back.

 There are also other solutions offering catchup television services, or "catchup". According to these solutions, the video programs are made available to users but only at the end of the broadcast of the current program, or only the day after its broadcast.

 There is therefore a need for a new visualization technique, from a predetermined time position in the stream being broadcast, of an already broadcast portion of this stream, which is simple to implement and inexpensive, and does not require local equipment.

 3. Presentation of the invention

 The invention relates to a method of providing, to at least one user terminal, an already broadcast portion of a multimedia stream being broadcast in a digital broadcast network.

According to a particular characteristic of the invention, the method comprises a step of providing the part of the multimedia stream, by a remote server of the user terminal, from a predetermined time position in the multimedia stream, via a network of communication distinct from the digital broadcasting network, the supplying step comprising: a substep of receiving a multimedia stream and, for each portion received from the multimedia stream and for at least a predetermined delivery rate of the portion of the multimedia stream, user terminal, the following substeps, implemented in the remote server:

 encoding the portion received delivering at least one fragment of independent content;

 storing the independent content fragment in a circular buffer zone of predetermined size, called circular buffer;

 A substep of concatenation of the independent fragments stored in the circular buffer, from the stored independent fragment corresponds to the predetermined time position, delivering the part of the multimedia stream in the form of at least one file to be downloaded by the terminal user.

The invention, according to its various embodiments, thus proposes an original solution for the provision of an already broadcast part of a multimedia stream being broadcast on a network, but not necessarily being displayed on the user terminal.

 Indeed, unlike the solutions of the prior art proposing either to use a local storage device connected to the user terminal to record a content and replay on request of the user (time shifting solutions), or to allow access to content on a server, once the live broadcast is over, and sometimes only the next day (catch-up television solutions), the sol ution according to the invention allows a user to view, from a chosen moment, an already broadcast part of a multimedia stream, without requiring local storage equipment, and as it would have visualized live.

 In addition, according to a particular embodiment of the invention, the already broadcast portion of the multimedia stream is accessible by the user's terminal via an IP communication network, the multimedia stream being for example broadcast via a digital television network. earthly.

 Moreover, according to this embodiment of the invention, the method also allows a user to "navigate" in the already broadcast portion of the multimedia stream, that is to say to go back, to go further. or to pause the playback of the already broadcast part of the multimedia stream, within the limit of the size of the circular buffer.

Thus, according to this embodiment of the invention, the remote server receives the multimedia stream broadcast on the network, the cut and the encode as and when it is received in a plurality of independent fragments, also called "chunks" », And stores these fragments in a circular buffer of predefined size, for transmission at a predetermined rate. If several transmission rates are desired, several encodings are implemented, so as to have "chunks" for different desired rates.

 These "chunks" each constitute multimedia content that is self-sufficient, that is to say that can be read independently. For example, a video chunk includes video data and bit rate information and allows a video to start at the beginning of its playback.

 The remote server then concatenates these stored fragments, as and when the transmission to the user terminal, the desired rate.

 In this way, the flow resulting from the concatenation of independent fragments, implemented gradually, can be transmitted / made available to the user terminal during the real-time broadcast of the stream on the network, within the limit of the size of the circular buffer . Thus, a content of the multimedia stream already broadcast, having a duration less than the size of the buffer can be viewed by the user even after the end of its broadcast in real time, the "chunks" corresponding to the content are still available in the buffer circular. In this case, the concatenation of "chunks" corresponding to the content starts from a "chunk" stored at a certain place in the circular buffer, according to the time elapsed since the beginning of the recording of "chunks" in this buffer . On the other hand, a step back in the multimedia flow can be done only until a "chunk" video still stored in the buffer memory, and the fast advance will be limited to the moment when one will have caught up with the diffusion in real time of the multimedia stream. In addition, in the case of the pausing feature, a user may find it impossible to resume viewing a previously played part, if the pause time has been too long and the "chunks" video corresponding to the part of which it wishes to resume viewing are no longer stored in the buffer, because replaced by "chunks" video more recent. In this case, the user terminal might display an error message or a message indicating that the service is no longer available.

 According to a particular aspect of the invention, the predetermined size of the circular buffer corresponds to a maximum number of stored independent content fragments, and, for a current independent content fragment to be stored, the method comprises, prior to the substep of storage, a sub-step of deleting the oldest stored independent content fragment, when the number of stored independent content fragments corresponds to the predetermined size of the circular buffer.

Thus, the circular buffer is intended to store a maximum number of "chunks", and, according to the conventional operation of a circular buffer, when the buffer is filled, the storage of a new "chunk" requires the removal of the oldest "chunk".

 For example, the encoding step includes a substep of associating an identifier with said independent content fragment.

 Thus, according to this embodiment of the invention, an identifier is associated with each video "chunk", so as to be able to locate the video "chunk" (corresponding to the time position chosen by the user) from which to concatenate the "Chunks" and provide them to the user. Indeed, a "chunk" video is independent, the provision of the concatenation of "chunks" can start from any "chunk" video.

 According to a particular characteristic of the invention, the method comprises a step of providing, by the remote server to the user terminal, the part of the multimedia stream, on request of the user terminal.

Thus, according to this embodiment, the provision of the multimedia stream part, already broadcast, required by the user follows a request from this user for navigation in the multimedia stream, from a time chosen in the flow, corresponding for example to the beginning of a content, or to a specific location of a content. For example, the user validates with his remote control access to the service of providing a part of the multimedia stream already broadcast, from a chosen moment in the stream, and the user terminal "recovers" this part of the multimedia stream already broadcast, on the remote server.

 For example, the request of the user terminal comprises at least one piece of information representative of the predetermined time position.

 Thus, according to this embodiment of the invention, the user indicates, when he wants to access an already broadcast portion of a multimedia stream, which time position in the stream he wants to start reading. For example, the user may wish to view a content from a specific moment in the stream, or the user may also go back, so choose a moment "earlier" in the stream, or advance and so choose a moment "later" in the stream, or pause the visualization, so as to resume the temporal position of the pause, all this within the limit of the size of the circular buffer, as already described ci -above.

 Whatever the situation, information representative of the temporal position chosen by the user is transmitted at the same time as the request.

On the other hand, in the case where the user resumes the display after a pause, the method has stored in the user terminal, the pause time position and the resume playback request of the content, after pausing therefore understands this position. For example, this information representative of the temporal position chosen by the user may correspond to an image in the multimedia stream, or to a temporal information indicating the moment in the content ...

 In particular, the information representative of the predetermined temporal position corresponds to an identifier of one of the independent content fragments and the sub-step of providing the part of the multimedia stream concatenates the independent fragments stored from the stored independent fragment identified by the identifier.

 Thus, according to this embodiment of the invention, the information representative of the instant chosen in the content by the user corresponds precisely to a "chunk" video identifier, so as to be able to directly supply the already broadcast portion of the Multimedia stream from the identified video chunk.

 In this way, the step of providing the already broadcast portion of the multimedia stream concatenates the "chunk" from that identified in the user's request, corresponding to the time position chosen by the user.

 According to one particular aspect of the invention, the request from the user terminal comprises at least one piece of information representative of the desired bit rate for the provision of the part of the multimedia stream.

 Thus, the user terminal can choose the rate at which it wishes to view the already broadcast portion of the multimedia stream, for example depending on the bandwidth available between the remote control module on the remote server, and the user terminus. In this particular embodiment of the invention, the desired rate may be indicated in the request for viewing the content.

 According to a particular embodiment of the invention, the method further comprises a step of providing, by the remote server, to the user terminal, at least one piece of information representative of the part of the multimedia stream.

 Thus, information making it possible to access a portion of a multimedia stream is made available by the remote server, for the user terminal, such as the U L for accessing the stream, and so on.

 In this way, when the user terminal requires the service, it obtains this information which allows it to access the part of multimedia stream already broadcast to read it and return it to the user.

According to one particular aspect of the invention, when a plurality of user terminals issue requests, the method comprises a terminal request management step. users delivering to the user terminals access rights to the part of the multimedia stream. Thus, when several user terminals transmit a request for viewing an already broadcast part of the same multimedia stream, the method according to the invention manages these requests so as to avoid saturation of the modules providing the multimedia contents, and so as to ensure the quality of service.

 For example, query management can set up tokens delivered during access requests.

 According to a particular embodiment of the invention, the method also comprises a step of encrypting the part of the multimedia stream.

 Thus, the multimedia content corresponding to the concatenation of the multimedia fragments of the already broadcast part of the multimedia stream to be provided can be encrypted so as to protect it from illegal copies. For example, a digital rights management technique of "DM" type (for "Digital ights Management" in English) is applied to the multimedia content, which is then encoded according to a technique compliant with the HbbTV 1.5 standard, for example Dynamic Adaptive Streaming over HTTP (DASH).

 According to a particular characteristic of the invention, the method comprises the following steps:

 displaying, on the user terminal, a temporal representation of the part of the multimedia stream;

 selecting from the representation displayed by the user of the predetermined time position, delivering a time position information in the part of the multimedia stream;

 conversion of the time position information delivering the information representative of the predetermined time position.

 Thus, according to this embodiment of the invention, the user has a graphical interface allowing him to navigate in the multimedia stream, and therefore to choose a moment in the stream from which he wants to start a visualization.

 For example, a temporal representation of the flow flow is provided to the user, on which he can move a cursor to choose the start time of viewing.

 For more ergonomics, some images of the stream, for example "keyframes" of a movie, can also be displayed on the terminal of the user, so that the latter is temporally identified in the stream and choose the moment from which he wants to start his visualization.

According to another variant, the graphical interface represents the different programs, or contents, forming the multimedia stream, and the user can then choose a viewing start time corresponding for example at the beginning of a program, or content.

 Once the selection is made by the user, that is to say once chosen the moment from which it wishes to start its viewing, this selection is converted into information that can be used by the content delivery server, for example information corresponding to an image in the stream, or temporal information, or a program number, or directly a "chunk" video identifier.

 The invention also relates to a device for providing, to at least one user terminal, an already broadcast part of a multimedia stream being broadcast in a digital broadcasting network, the device, remote from the user terminal, comprising means providing the part of the multimedia stream, from a predetermined time position in the multimedia stream, via a communication network separate from the digital broadcasting network, the supply means comprising:

 Means for receiving the multimedia stream and, for each portion received from the multimedia stream and for at least one predetermined bit rate for providing the portion of the multimedia stream to the user terminal, the following means:

 encoding means for the received portion delivering at least one independent content fragment;

 storage means of the independent content fragment in a circular buffer zone of predetermined size, called circular buffer;

Means for concatenating the independent fragments stored in the circular buffer, from the stored independent fragment corresponding to the predetermined time position, delivering the part of the multimedia stream in the form of at least one file to be downloaded by the user terminal.

 The invention also relates to a user terminal of an already broadcast part of a multimedia stream being broadcast in a digital broadcasting network, comprising the following means:

 means for displaying a temporal representation of the multimedia stream;

 selection means from the representation displayed by the user of the predetermined time position, delivering a time position information in the multimedia stream;

 means for converting the time position information delivering the information representative of the predetermined time position;

means for transmitting a request for supplying the part of the multimedia stream comprising at least the information representative of the predetermined instant. The invention also relates to a computer program comprising instructions for the implementation of a supply method as described above, when this program is executed by a processor.

The invention also relates to a computer-readable and non-transitory storage medium, storing a computer program comprising instructions executable by a processor for implementing a supply method as described above.

 4. List of figures

 Other features and advantages of the invention will appear more clearly on reading the following description of a particular embodiment, given as a simple illustrative and nonlimiting example, and the appended drawings, among which:

 Figure 1 shows the main steps of a method of providing an already broadcast portion of a multimedia stream, according to a particular embodiment of the invention;

 FIG. 2 presents a sequence diagram illustrating the implementation of the invention, according to this particular embodiment of the invention;

 FIG. 3 illustrates an exemplary system embodying the invention, according to a particular embodiment of the invention;

 FIG. 4 illustrates an example of temporal representation of a multimedia stream on a user terminal, according to a particular embodiment of the invention.

 5. Description of an embodiment of the invention

 5.1 General principle

 The general principle of the invention is based on the progressive encoding and cutting (into independent fragments) of a multimedia stream as it is broadcast in real time in a first digital broadcasting network, so as to store, as this real-time broadcast proceeds, the successive independent fragments in a circular buffer area.

 This circular buffer zone then makes it possible to concatenate the various independent fragments stored in order to provide at least one user terminal with an already broadcast portion of a multimedia stream, during the real-time broadcasting of this stream, from a temporal position. predetermined in the stream (for example the beginning of a program) and via a second communication network.

Thus, a terminal having requested such a viewing service of an already broadcast part of a multimedia stream, also called a navigation service in a multimedia stream in progress. broadcast, allows a user to view the multimedia content corresponding to this already broadcast portion of the multimedia stream without requiring local equipment to the user terminal, the multimedia content being provided to the user terminal by a remote server, also called "platform providing service ".

 In addition, the provision of this already broadcast portion of the multimedia stream is implemented via a communication network separate from the real-time broadcast network of the stream. For example, the real-time broadcast network corresponds to digital terrestrial television (DTT) and the communication network of the multimedia content file corresponds to an IP network.

 Moreover, the invention, according to its various embodiments, is also based on the transmission, from the user terminal to the remote server, of information representative of the temporal position in the stream chosen by the user to start the visualization. , this information being transmitted with the request sent by the user terminal to the remote server.

 The main steps of the method according to a particular embodiment of the invention are now presented with reference to FIG.

 A multimedia stream 10, for example a video, is considered to be broadcast 100 in a broadcast network, for example DTT. According to this embodiment of the invention, a delivery step 110 delivers, from a predetermined time position in the multimedia stream 10, also called the predetermined instant t, a part 11 of the multimedia stream, already broadcast, to a terminal during broadcast 100 of the corresponding multimedia stream.

 This provisioning step 110 includes a sub-step 111 for receiving the multimedia stream 10, portion by portion, and the following substeps implemented for each portion received from the multimedia stream 10:

 Encoding 112 of the received portion delivering at least one fragment of independent content;

 Storing 113 of the independent content fragment in a circular buffer zone of predetermined size, called circular buffer.

 Then, at the request of a user, a step 114 of concatenation of the independent fragments stored in the circular buffer, from the stored independent fragment corresponding to the predetermined time position, is implemented, to deliver to the user the part 11 of the multimedia stream, already broadcast.

If we take an example of the broadcasting of a video 10 in a terrestrial digital television network, the encoding step 112 of the video takes as input the real-time stream of the chain provides the service and releases video fragments of some sort, independent of each other, called "chunks". These video fragments are then stored, during the storage step 113, in a circular buffer.

 These two steps 112 and 113 are implemented as the real-time streaming of the multimedia stream and thus allow to store progressively, in a circular buffer, independent video fragments from the encoding of the video stream. broadcast course.

 Next, the concatenation step 114 takes as input the video fragments stored to provide the user terminal with the part 11 (already broadcast) of the multimedia stream, via an IP network for example.

 Part 11 of the multimedia stream required by the user is therefore accessible at any time, during the streaming of the stream in real time, within the limit of the size of the circular buffer used to store the independent fragments. Indeed, as the real time streaming of the multimedia stream, the fragments stored the oldest pl us are deleted to make room for fragments to store the most recent.

 Moreover, according to another characteristic of this embodiment of the invention, several parts of multimedia stream 11 may be available, depending on several desired bit rates by different user terminals.

 Indeed, the service of viewing a previously broadcast part of a multimedia stream being broadcast, from a predetermined time t, allows different user terminals, which may have different technical characteristics, to view the part of flow required at the proper flow. The location of the user terminal with respect to the server providing the service, as well as the quality of the transmission network between this terminal and this server, can also be taken into consideration for the choice of the delivery rate of the multimedia content.

 Thus, the solution according to this particular embodiment of the invention makes it possible to provide, from a multimedia stream being broadcast, the same part, already broadcast, of the multimedia stream at several different rates.

 5.2 Description of an embodiment

 FIG. 2 shows an example of the operation of such a navigation service in a multimedia stream currently being broadcast, when at least one user terminal, denoted M4, wishes to benefit from the service.

In this sequence diagram presented in FIG. 2, different modules of the server, or of the service providing platform are involved, according to a particular embodiment of the invention. It is understood that this example is not restrictive and that certain tasks can be implemented by other modules of the server, according to other particular embodiments of the invention.

 It is considered that the opening of the service is carried out at the initiative of the multimedia service provider, which transmits service opening information to the service delivery platform. It is also the operator who transmits to the service delivery platform information indicating the closure of the service (for example when the real-time broadcast of the multimedia stream is completed).

 According to a variant of this particular embodiment of the invention, a module M '(not shown) of the service delivery platform can be implemented to process the information received from the operator (opening / closing of the service) and transmit them to a main service management module on the service delivery platform.

 In particular, in this example, we consider the following main modules M1 to M3 of the service delivery platform:

 • Ml: this module, also called encoder, ensures the encoding of the multimedia stream broadcast in real time, as it is broadcast, according to the steps 111 of reception and 112 encoding already described above. This module Ml therefore takes the multimedia stream as input and outputs a plurality of multimedia content fragments, called "chunks". These fragments of content are therefore delivered to the module M2 described below, as and when the streaming of the stream in real time.

 • M2: this module takes as input the multimedia stream cut into "chunks" by the module Ml and stores each of these fragments of content in a circular buffer of predetermined size, as already described above in connection with the step 113. The content fragments are stored as and when they are supplied by the module Ml and are therefore available as and when for the module M3 described below.

M3: this module, also called video server, takes as input the fragments of content stored by the module M2 and concatenates them (step 114 described above) so as to provide the user terminal M4 a part 11, already broadcast, of the multimedia stream. For the user terminal, this part of the multimedia stream is seen as a download file, at any time of the broadcast. real time of the multimedia stream, when the service is open and within the limit of the size of the circular buffer. In addition, this module M3 can be duplicated in as many instances as necessary, in order to respond to a large number of requests from user terminals wishing to benefit from the service. Thus, a plurality of instances of the module M3 is able to provide an already broadcast portion of a multimedia stream to a plurality of user terminals.

 A module M "(not shown), also called" front office "for front end server or front area, provides the user terminal M4 information necessary for the use of the service, such as the access address (" URL ) ... when the multimedia content ia (corresponding to the already broadcast portion of the multimedia stream) is supplied to the user terminal via a communication network I P. This module M "obtains this information on the service via the main module of management of the service from which he can previously register. As for the module M3, this module M "can be duplicated in as many instances as necessary, in order to respond to a large number of requests from user terminals wishing to benefit from the service, thus a plurality of instances of the module is able to to provide information necessary for the use of the service to a plurality of user terminals This module M "can also manage the different requests of the user terminals by the implementation of access tokens, provided to the user terminals, by for example, to de-escalate the service information, thereby "regulating" the load on the M3 video servers and ensuring the quality of service. Furthermore, this module M "may also be in charge of collecting, from the user terminals, information necessary for calculating statistics of the service.

 As already indicated, it should be noted that the sequences described above can be implemented for several delivery rates of an already broadcast portion of a multimedia stream. Thus, an advantage of the invention, according to its different embodiments, is to be able to provide, at different rates, the same part already broadcast of a multimedia stream, while this stream is being broadcast.

 Indeed, because of the disparity of the user terminals, from a technical point of view and from a point of view of localization with respect to the service delivery platform, it is advantageous to be able to provide multimedia content with different bit rates. of transmission.

 Specifically, each instance of the M3 module provides the same multimedia content at different rates.

This allows each user terminal M4 to choose the flow best suited to the bandwidth between it and the M3 module of the service providing platform. For example, to choose this rate, the user terminal M4 can download a file of predefined size, preferably small (for example 300 K bytes), on the module M3 and estimate the flow available between him and M3 from the time download.

 Furthermore, it should be noted that, according to a particular embodiment of the invention, the exchanges between the different modules of the service delivery platform are implemented via IP networks.

 In addition, charge controllers (not shown) can be added in the front office part of the service delivery platform to support a large load within this service delivery platform.

 FIG. 3 shows an exemplary implementation system of the invention, according to this embodiment of the invention, in which is illustrated an example of a device for providing an already broadcast part of a multimedia stream, under the form of a service providing platform, and an example of an M4 user terminal.

 According to this embodiment of the invention, such a device comprises means / module (s) for providing, to at least one user terminal, an already broadcast part of a multimedia stream currently being broadcast in a network of digital broadcasting, from a predetermined time position in the multimedia stream, via a communication network separate from said digital broadcast network.

 According to this embodiment, the means for providing the device comprise means for receiving the multimedia stream and, for each portion received from the multimedia stream and for at least one predetermined delivery rate, the following means:

 Encoding means / module (s) Ml of the received portion, delivering at least one fragment of independent content;

 Means / module (s) M2 for storing the independent content fragments in a circular buffer zone of predetermined size, called circular buffer.

 In addition, the device delivery mechanisms also comprise means / module (s) M3 for concatenating the independent fragments stored in the circular buffer, from the stored independent fragment corresponding to the predetermined time position chosen by the user.

The modules M 1 to M 3 have already been described above, as well as the relationships between these different modules, and with the user terminal M4. The user terminal M4 may comprise the following modules M4a and M4b (not shown):

• M4a: This module is an IP video decoding module, taking a "URL" as input and decoding the part of the multimedia stream 11 transmitted by the module M3 of the platform for providing the service. More preferably, this module M4a receives, from the module M4b (control module), a command C1 comprising in particular an information representative of the predetermined instant t in the stream chosen by the user to start the visualization. This information representative of the time t chosen by the user may be temporal information, information indicating an image corresponding to the instant t or directly an identifier of the independent video fragment ("chunk" video) corresponding to this instant t. The module M4a sends to the module M3 of the service delivery platform a command C comprising in particular this information representative of the time t chosen by the user. · M4b: this module allows the user to choose from what time position he wants to view the multimedia stream. The user can thus "navigate" in the stream being broadcast, that is to say, view a portion of stream from any time position in this stream, including go back or make an advance fast (and this in the temporal imit corresponding to the size of the circular buffer memory, that is to say that the backtracking can be done until a video "chunk" still stored in the buffer memory, and the fast forward will be limited to the moment when the real-time broadcast has been caught), or to pause the visualization of the content. When the user has chosen this temporal position, also noted instant t, this module M4b transmits to the module M4a a command C1, comprising in particular information on the flow visua l ise r and information representative of the time position chosen by the 'user. In addition, the user terminal M4 also comprises means / module (s) for displaying a temporal representation of the multimedia stream, for example in the form of a "time line" presenting a time scale and / or images of the stream at certain temporal positions and / or indications corresponding to names or numbers of programs, or of a ba rre ho rizonta the vertica the graduation tem porel lement ... This temporal representation of the flow thus allows the user to navigate in the current stream of broadcast, and choose the temporal position in the stream, from which it wishes to view a portion of the stream already broadcast. Once this temporal position has been chosen by the user, the module M4b transmits to the module M4a the command C1 including information representation of this time position chosen by the user.

 In the particular case where the user pauses the playback of the content, the time position corresponding to this pause is stored, for example within the user terminal, and when the user requests resume playback of the content, after a pause, the user terminal issues a request including this stored time position to the remote server (the service delivery platform).

 5.3 Example of application

A user wishing to display, on his HbbTV-type connected television, a program Pj, already broadcast on a channel / ' , offering the navigation service in a video stream being broadcast, is considered.

On its television, the user can interact with an interface displaying, for example in the form of a chronological frieze as illustrated in FIG. 4, the x (for example four) last hours of program, already broadcast, on the channel / ' . For example, time markers represent slices of 15 minutes, below the frieze, while numbers and / or program names are indicated in the frieze. The user can navigate a cursor (bold line in Figure 4, at the beginning of the program PJ) and then validate the position of this cursor, for example via a key "validation" on his remote, when he has selected the moment from which it wishes to view an already broadcast part of the multimedia stream being broadcast.

 It should be noted that this temporal representation of the multimedia stream takes into account the size of the circular buffer zone used to store the "chunks", so as not to offer the user an already broadcast portion of the stream that is not more stored in this buffer area.

When the user validates this choice, a request is sent, as already described above, to the service delivery platform, which in turn provides the multimedia content from the time position chosen by the user. Thus, the user can view a part, already broadcast, of a multimedia stream being broadcast, from a chosen time position. In the example, the user will be able to view the program Pj, then the advertising (Pub) that follows and the following programs, unless he chooses to stop viewing, or to navigate again in the stream to view content, or part of the feed, already broadcast.

 Thus, unlike the prior art catch-up television techniques, which allow a user to view a program, as such and not as a "part of a stream", that is, without intermediates, advertising cuts, advertisements, etc. the sol ution according to the various particular embodiments of the invention allows a user to view an already broadcast part of a multimedia stream being broadcast, this part may correspond to a a program, a portion of a program, a suite of programs, ... as it would have been displayed live.

 It should be noted that if the service is not available, the user terminal may display a message informing the user of the unavailability of the service.

Claims

 A method of providing, to at least one user terminal, an already broadcast portion of a multimedia stream being broadcast in a digital broadcast network,
characterized in that said method comprises a step of providing said portion of said multimedia stream, by a remote server of said at least one user terminal, from a predetermined time position in said multimedia stream, via a communication network separate from said network digital broadcast, said supplying step comprising:
 A sub-step of receiving said multimedia stream and, for each portion received from said multimedia stream and for at least a predetermined rate of supply of said portion of said multimedia stream to said at least one user terminal, the following substeps, implemented in said remote server:
 encoding said received portion delivering at least one fragment of independent content;
 storing said at least one fragment of independent content in a circular buffer zone of predetermined size, called circular buffer;
A substep of concatenation of said independent fragments stored in said circular buffer, from the stored independent fragment corresponding to said predetermined time position, delivering said part of said multimedia stream in the form of at least one file to be downloaded by said at least one user terminal.
 2. A method of supply according to claim 1, characterized in that said predetermined size of said circular buffer corresponds to a maximum number of stored independent content fragments,
and in that, for a current independent content fragment to be stored, said method comprises, prior to said storage sub-step, a sub-step of deleting the oldest stored independent content fragment, when the number of fragments stored independent content corresponds to said predetermined size of said circular buffer.
3. The method of claim 1, wherein said encoding step includes a substep of associating an identifier with said independent content fragment.
 4. A method of supply according to claim 1, characterized in that said method comprises a step of providing, by said remote server auditing at least one end user, said portion of said multimedia stream, on request of said user terminal.
5. Method of supply according to claim 4, characterized in that said request of said user terminal comprises at least one piece of information representative of said predetermined time position.
 6. A method of supply according to claim 5, characterized in that said information representative of said predetermined time position corresponds to an identifier of one of said independent content fragments,
and in that said substep of providing said portion of said multimedia stream concatenates said independent fragments stored from the stored independent fragment identified by said identifier.
 7. A method of supply according to claim 4, characterized in that said request of said user terminal comprises at least one information representative of the desired bit rate for said provision of said part of said multimedia stream.
 8. A method of supply according to claim 1, characterized in that said method further comprises a step of providing, by said remote server, said user terminal, at least one piece of information representative of said portion of said multimedia stream.
9. The method of supply as claimed in claim 5, characterized in that said method comprises the following steps:
 displaying, on said at least one user terminal, a temporal representation of said portion of said multimedia stream;
 selecting from said representation displayed by said user, said predetermined time position, delivering a time position information in said portion of said multimedia stream;
 converting said time position information delivering said information representative of said predetermined time position.
 Device for providing, to at least one user terminal, an already broadcast portion of a multimedia stream currently being broadcast in a digital broadcasting network,
characterized in that said device, remote from said at least one user terminal, comprises means for supplying said portion of said multimedia stream from a predetermined time position in said multimedia stream via a communication network separate from said broadcast network digital, said supply means comprising:
 Means for receiving said multimedia stream and, for each portion received from said multimedia stream and for at least one predetermined rate of supply of said portion of said multimedia stream to said at least one user terminal, the following means:
 encoding means of said received portion delivering at least one fragment of independent content;
storage means for storing said at least one fragment of independent content in a circular buffer zone of predetermined size, called circular buffer;
 Concatenation means of said independent fragments stored in said circular buffer, from the stored independent fragment corresponding to said predetermined temporal position, delivering said part of said multimedia stream in the form of at least one file to be downloaded by said at least one user terminal; .
 11. User terminal of an already broadcast part of a multimedia stream being broadcast in a digital broadcasting network,
characterized in that it comprises the following means:
 means for displaying a temporal representation of said multimedia stream;
 selection means from said representation displayed by said user of said predetermined time position, delivering time position information in said multimedia stream;
 means for converting said time position information delivering said information representative of said predetermined time position;
 means for transmitting a request for supplying said part of said multimedia stream comprising at least said information representative of said predetermined instant.
Computer program comprising instructions for implementing a delivery method according to any one of claims 1 to 9 when this program is executed by a processor.
 A computer-readable and non-transitory storage medium storing a computer program comprising processor-executable instructions for implementing a delivery method according to any one of claims 1 to 9.
PCT/EP2014/058625 2013-05-02 2014-04-28 Method and device for feeding a portion, which is already broadcast, of a multimedia stream, corresponding user terminal, computer program and storage medium WO2014177523A1 (en)

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