Abstract: A method of transmitting media data and display composition data for rendering the media data on a display region is described. In the method, the display composition data defines the spatial and/or temporal relationship between one or more media entities of the media data, the display region being composed of one or more display sub-regions. The method also includes the steps of transmitting display modification data, for a respective display region and/or a respective display sub-region, the display modification data indicating how the visual configuration of the respective display region or display sub-region may be modified by a user.

Abstract: The invention concerns providing for each media package a plurality of spatial composition datasets defining the initial spatial rendering of the media entities of the media package and for each spatial composition datasets a plurality of temporal composition datasets. The invention may be applied to MMT data.

Abstract: To compress headers efficiently, headers may be differentially encoded. In one embodiment, a difference between a current field and a reference field can be used in a reduced header. In another embodiment, the least significant bits of the current field can be used to represent the current field. When such a field is received, the most significant bits of a reference field are needed to de compress the field. In addition, the present principles determine the typical usage scenarios that may benefit from header compression and further determine that some fields can be removed in a reduced header or be represented by fewer bits. Header compression may impose constraints on the representation of the current field. The present principles recognize constraints on using reduced headers and provide rules and guidelines on applying header compression.

Abstract: The invention concerns the exchange of parameters between communication devices of a network describing their respective data sessions and the application, at a communication device, of a bandwidth distribution algorithm using the exchange parameters to allocate bandwidth to one or more data sessions in the network.

Abstract: Network equipment for establishing a manifest to be provided to a requesting terminal configured to receive a multimedia content divided into segments from a network equipment, each segment being available in one or more representations, said manifest listing available representations for the multimedia content and specifying a plurality of adaptation sets, each adaptation set defining a spatial object of the multimedia content, the spatial objects of the adaptation sets defining a whole spatial object is described. The network equipment includes at least one memory and at least one processing circuitry configured to define, in the manifest, a type of mapping of the multimedia content to the whole spatial object and a point of reference in one adaptation set of reference amongst the adaptation sets, and associate depth information with each adaptation set.

Abstract: The invention concerns providing for each media package a plurality of spatial composition datasets defining the initial spatial rendering of the media entities of the media package and for each spatial composition datasets a plurality of temporal composition datasets. The invention may be applied to MMT data.

Abstract: When layered coded content is transmitted over a fixed capacity network link, bitrate peaks may occur at similar time instances at the base layer and enhancement layer. To more efficiently use the bandwidth, the present principles propose different methods, such as adding a delay to a base layer bit stream or an enhancement layer bit stream, and shifting an “over-the-limit” portion of bits by a time window. At the receiver side, the present principles provide different channel change mechanisms to allow a user to change channel quickly even given the delay added in the bit streams. In particular, a decoder can start rendering the base layer content, without having to wait for the enhancement layer to be available. In one embodiment, the decoding of the base layer content is slowed down in order to align in time with the enhancement layer content.

Abstract: A method of transmitting media data and display composition data for rendering the media data on a display region is described. In the method, the display composition data defines the spatial and/or temporal relationship between one or more media entities of the media data, the display region being composed of one or more display sub-regions. The method also includes the steps of transmitting display modification data, for a respective display region and/or a respective display sub-region, the display modification data indicating how the visual configuration of the respective display region or display sub-region may be modified by a user.

Abstract: The present invention concerns a method of transferring content from a first communication device to a second communication device in a communication network, comprising the following steps: defining a first probability, according to which a content can be encoded; defining a second probability, according to which a content can be chosen; upon request of content from said second communication device to said first communication device: encoding content with another content according to said first probability, said content being chosen with said second probability, and transferring content z=x XOR y from said first communication device to said second communication device, or according to probability 1?pe transferring unencoded content x from said first communication device to said second communication device.

Abstract: To compress headers efficiently, headers may be differentially encoded. In one embodiment, a difference between a current field and a reference field can be used in a reduced header. In another embodiment, the least significant bits of the current field can be used to represent the current field. When such a field is received, the most significant bits of a reference field are needed to decompress the field. In addition, the present principles determine the typical usage scenarios that may benefit from header compression and further determine that some fields can be removed in a reduced header or be represented by fewer bits. Header compression may impose constraints on the representation of the current field. The present principles recognize constraints on using reduced headers and provide rules and guidelines on applying header compression.

Abstract: A method and apparatus are described for protecting real time media including receiving media packets, generating media bit strings from the media packets, applying a forward error correcting code across the generated media bit strings to generate at least one forward error correcting bit string and generating at least one forward error correcting packet from the at least one forward error correcting bit string. Also described are a method and apparatus for recovering from losses of real time media packets including forming media bit strings from received media packets, forming forward error correcting bit strings from received forward error correcting packets, decoding the formed media bit strings and forward error correcting bit strings to obtain recovered media bit strings and recover lost media packets from the recovered media bit strings. Further described is a data structure for a forward error correcting header on computer readable media.

Abstract: The invention enables a standard client according to the DVB-IPI phase 1 standard and connected within a local area network interconnected with a service delivery network via a non-transparent gateway to discover all the services offered to it both by the external delivery network an d by the servers in its local area network. The invention is based mainly on a service discovery aggregation functionality that we call “SD & S proxy” implemented on any one of the devices connected to the local area network running jointly with an ad-hoc configuration of the gateway.

Abstract: Method for transmission of images comprising: a reception of a source digital image comprising padding lines and data lines, the data lines comprising ancillary data and video data. In order to optimise the use of a transmission channel, the method also comprises: a filtering of padding lines to form sets of data comprising ancillary data and video data; a cutting of the sets into fragments of a maximum fragment length that is a function of a maximum transport packet length; an insertion of at least one image number in each of the fragments, each of the ancillary data and video data being associated with this number; an insertion of fragments into transport packets; and a transmission of the transport packets according to an internet protocol. The invention also relates to a corresponding method for reception.

Abstract: A control server is intended for controlling content distribution to peers coupled to a communication network which comprises at least one content serving means (CNS, N1-N3) storing contents. This control server is arranged i) for transmitting messages to these peers to inform them that a content will soon be distributed by means of an identified multicast session, and to identify content parts that have been respectively associated to them, and ii) for ordering at least one content serving means to initiate this identified multicast session to transmit the content to the peers, in order those having decided to listen to the multicast session store the content parts that have been identified into their respective messages.

Abstract: The invention concerns a method for assigning parts of multimedia files to distributed storage devices, the number of said devices being an integer n, characterized in that it comprises the following steps: a step consisting in dividing each multimedia file in windows, which represent data for contiguous playback of a given duration; a step consisting, for each multimedia file, in determining a number k so that any original window of file can be recovered from any k distinct symbols; a step consisting, for each window of each said multimedia files, in assigning n corresponding symbols to said devices, one to each device, the n distinct symbols being created using erasure coding; and a step consisting in partially or totally filling the storage memory left on each device after said first steps with prefix windows of said multimedia files.

Abstract: A method is intended for disseminating content data in a peer-to-peer mode between peers connected to at least one communication network. This method comprises the steps of: i) making peers exchange neighboring information between them to build a bipartite peer overlay comprising a first group, comprising peers having a complete content to be disseminated, and a second group, comprising peers having not this content or only a part of it and having links therebetween, ii) disseminating the data defining the content (and preferably encoded with erasure correcting codes) from peers of the first group to first peers of the second group according to the bipartite peer overlay, iii) disseminating the data received by the first peers to other peers of the second group according to the bipartite peer overlay, and iv) updating the bipartite peer overlay when a peer of the second group has fully completed the content.

Abstract: A method dedicated to the management of data transmission in peer to peer mode between peers that can connect to a communication network, each transmission being carried out by a peer, following the reception of a request from another peer, according to a selected reciprocity mechanism. When a peer wants to receive from another peer N blocks of data according to a first priority level Xk selected in a set of at least two different priority levels, in assigning to this peer an exchange value equivalent to a number M of blocks of data to be transmitted to at least one other peer according to a second priority level Xk? selected in this set, M being equal to N*mkk?, where mkk? is a predetermined value function of the first Xk and second Xk? selected priority levels.

Abstract: The present invention concerns a method of transferring content from a first communication device to a second communication device in a communication network, comprising the following steps: defining a first probability, according to which a content can be encoded; defining a second probability, according to which a content can be chosen; upon request of content from said second communication device to said first communication device: encoding content with another content according to said first probability, said content being chosen with said second probability, and transferring content z=x XOR y from said first communication device to said second communication device, or according to probability 1-pe transferring unencoded content x from said first communication device to said second communication device.

Abstract: In a method and an apparatus for navigating through subtitles of an Audio Video data stream an address information of one or more played back data units is stored together with the subtitle information of said played back data units during play back of said data units. One or more of said stored subtitle information can be displayed. Following the selection of one of said displayed subtitle information the stored address information of the data unit corresponding to the selected subtitle information is retrieved and the corresponding data unit is accessed using said retrieved address information. Playing back the accessed data unit conveniently allows to watch and listen to a scene including subtitles again, e.g. by a few clicks on the remote control.

Abstract: The invention relates to a method of transmitting digital data packets protected by error correction packets and more precisely the manner of inserting these correction packets into the data packet stream so as to increase the correction effectiveness of the error correction method while limiting the latency introduced into the transmission. The packets are set out in matrix form, error packets are computed on lines and columns and are inserted regularly into the stream at a sufficient distance from the data packets that they protect.