Guided transcoding

Delta quantized coefficients of a pixel block in a picture in a first representation of a video sequence are encoded based on information derived from estimated quantized coefficients for the pixel block. The delta quantized coefficients represent a difference between actual quantized coefficients of the pixel block derived by encoding at least a portion of the picture in the first representation of the video sequence and the estimated quantized coefficients. The estimated quantized coefficients represent a difference between a reconstructed block of a corresponding picture in a second representation of the video sequence and a prediction block obtained based on intra mode information and/or inter motion information derived by encoding the picture in the first representation of the video sequence.

Method and Arrangement for Transcoding

The present invention relates to a method and a transcoder arrangement of transcoding a bitstream representing an original video source from an input format to an output format. The method comprises the steps of receiving (S) the bitstream with the input video format, wherein the input video format is a high fidelity format; and receiving (S) side information related to said video bitstream. Said side information comprising at least: a video bitstream representing the original video source with a low fidelity input video format, coding parameters optimized based on knowledge of the original video source; transform coefficients, indicative of a residual between the original video source and a decoded version of the high fidelity format. The method further comprises decoding (S) said received side information to generate transcoding guiding information, estimating (S) a representation of said bitstream with a low fidelity output format based on the received bit stream and the generated transcoding guiding information, adding (S) the transform coefficients of the side information to transform coefficients generated from the estimated representation of said bitstream with the low fidelity output format to improve the estimated representation of said bitstream with the low fidelity output format and encoding (S) the improved estimated representation of said bitstream with the low fidelity output format. 116-. (canceled)17. A method for a transcoder arrangement of transcoding a bitstream representing an original video source from an input format to an output format , comprisingreceiving the bitstream with the input video format, wherein the input video format is a high fidelity format;receiving side information related to said video bitstream, said side information comprising at least: a video bitstream representing the original video source with a low fidelity input video format, coding parameters optimized based on knowledge of the original video source, and transform ...

Constructing Inter-Layer Reference Picture Lists

A method () of constructing at least one list of reference pictures for inter-layer prediction of a current picture is provided. The method comprises inserting () reference pictures into a first set of reference pictures or a second set of reference pictures, based on respective values of a scalability identifier associated with the reference pictures and a value of the scalability identifier associated with the current picture, and inserting () the first set of reference pictures and the second set of reference pictures into the at least one list of reference pictures. By taking indications for similarities between reference layers and the current layer into account, a more efficient multi-layer video compression is achieved. Further, a corresponding computer program, a corresponding computer program product, and a corresponding device are provided. 130-. (canceled)31. A method of constructing at least one list of reference pictures for inter-layer prediction of a current picture , the method comprising:inserting reference pictures into a first set of reference pictures or a second set of reference pictures based on respective values of a scalability identifier associated with the reference pictures and a value of the scalability identifier associated with the current picture; andinserting the first set of reference pictures and the second set of reference pictures into the at least one list of reference pictures.32. The method of claim 31 , wherein the reference pictures are inserted into the first set of reference pictures or the second set of reference pictures based on a difference of their respective value of the scalability identifier and the value of the scalability identifier associated with the current picture.33. The method of claim 32 , wherein reference pictures having respective values of the scalability identifier which are smaller than the value of the scalability identifier associated with the current picture are inserted into the first set of ...

Thinning of Packet-Switched Video Data

This invention relates to a method and to a system for thinning a stream of packet-switched video data in which a stream of packet-switched video data is detected and the size of the packets in the video stream is determined, wherein packets of the video stream data are dropped depending on the size of the packets.

Multicasting Technique for Scalably Encoded Media Layers

A technique for distributing in a multicasting network media content via two or more media layers is described. The media layers are hierarchically arranged in accordance with a scalable coding protocol such as the Scalable Video Coding (SVC) protocol. In a method implementation of this technique, in a first step a first number of media recipients for a first media layer that is transmitted via a first bearer of the multicasting network is determined. Then, a second bearer of the multicasting network for at least one second media layer is selected taking into account the first number and a hierarchical relationship between the first media layer and the second media layer. 122-. (canceled)23. A method of distributing media content in a multicasting network via two or more media layers , wherein the media layers are hierarchically arranged in accordance with a scalable coding protocol , the method comprising:determining a first number of media recipients of a first media layer, wherein the first media layer is transmitted via a first bearer of the multicasting network; andselecting a second bearer of the multicasting network for transmission of at least one second media layer, taking into account the first number and a hierarchical relationship between the first media layer and the at least one second media layer.24. The method of claim 23 , further comprising determining a second number of media recipients of the at least one second media layer claim 23 , taking into account the first number claim 23 , and wherein the second bearer is selected by also taking into account the second number.25. The method of claim 24 , wherein the first number is determined by counting the media recipients receiving the first media layer claim 24 , and wherein the second number is determined by deriving the second number from the first number.26. The method of claim 24 , wherein determining the second number comprises adding to the first number a third number of media recipients that ...

Constructing inter-layer reference picture lists

A method (200) of constructing at least one list of reference pictures for inter-layer prediction of a current picture is provided. The method comprises inserting (210) reference pictures into a first set of reference pictures or a second set of reference pictures, based on respective values of a scalability identifier associated with the reference pictures and a value of the scalability identifier associated with the current picture, and inserting (220) the first set of reference pictures and the second set of reference pictures into the at least one list of reference pictures. By taking indications for similarities between reference layers and the current layer into account, a more efficient multi-layer video compression is achieved. Further, a corresponding computer program, a corresponding computer program product, and a corresponding device are provided.

Technique for determining usage of encrypted media content

A technique for determining usage of encrypted media content is described. A method implementation of this technique comprises the steps of obtaining a short-term key for decrypting the media content, obtaining a long-term key for decrypting the short-term key, decrypting the short-term key based on the long-term key, decrypting the media content based on the decrypted short-term key, and logging a parameter relating to the short-term key as a basis for determining media content usage. The short-term key may be a Traffic Encryption Key, TEK, and the long-term key may be a Service Encryption Key, SEK.

VIDEO TRANSCODING

The present disclosure relates to transcoding a coding tree unit (CTU) in a picture of a video sequence. An input encoded representation of the CTU is decoded to obtain coding parameters for the input encoded representation. The coding parameters are used to determine a search sub-space consisting of a subset of all possible combinations of candidate encoded representations of the CTU. The CTU is encoded to get an output encoded representation of the CTU belonging to the search sub-space. 1. A method of transcoding a coding tree unit of a picture in a video sequence , wherein said coding tree unit comprises one or multiple coding units of pixels , said method comprising:decoding an input encoded representation of said coding tree unit to obtain coding parameters for said input encoded representation; anddetermining, based on said coding parameters, a search sub-space consisting of a subset of all possible combinations of candidate encoded representations of said coding tree unit; and encoding said coding tree unit to get an output encoded representation of said coding tree unit belonging to said search sub-space.2. The method according to claim 1 , wherein:decoding said input encoded representation comprises decoding said input encoded representation of said coding tree unit to obtain pixel values of said pixels and said coding parameters;encoding said coding tree unit comprises encoding said pixel values of said pixels to get said output encoded representation belonging to said search sub-space.3. The method according to claim 1 , wherein encoding said coding tree unit comprises selecting claim 1 , as said output encoded representation claim 1 , a candidate encoded representation i) belonging to said search sub-space and ii) optimizing a rate-distortion quality metric.4. The method according to claim 1 , wherein:said at least one coding tree unit is recursively split in a quad-tree structure of coding units; said coding parameters define said quad-tree structure; ...

METHODS AND ARRANGEMENTS FOR TRANSCODING

According to one aspect the present invention relates to a method for a video encoder. The method comprises providing () to a transcoder a first bitstream representing a video sequence with a first format, creating () a second bitstream representing transcoding information indicative of a transcoding method that should be used by the transcoder for transcoding the video sequence from the first format to a second format, and providing () to the transcoder the second bitstream. 136-. (canceled)37. A video encoder , the video encoder configured to:provide to a transcoder a first bitstream representing a video sequence with a first format;create a second bitstream representing transcoding information indicative of a transcoding method that should be used by the transcoder for transcoding the video sequence from the first format to a second format; andprovide the second bitstream to the transcoder, whereinthe transcoding information comprises at least one syntax element at least indicative of if a residual needs to be regenerated at the transcoder or if the residual is provided from the encoder, andthe residual is originating from a difference between the video sequence of the second format and a prediction of the video sequence of the second format generated according to transcoding information.38. The video encoder according to claim 37 , wherein the at least one syntax element is a transform skip flag.39. The video encoder according to claim 38 , wherein the transform skip flag equal 0 indicates that the residual is provided from the encoder and transform skip flag equal to 1 indicates that the residual is not provided from the encoder.40. The video encoder according to claim 39 , whereinthe transcoding information comprises one of a plurality of patterns of coded transform coefficients,one specific pattern is indicative of that a residual needs to be regenerated at the transcoder and the remaining patterns are indicative of that the residual is provided from the ...

IDENTIFYING A PARAMETER SET FOR DECODING A MULTI-LAYER VIDEO REPRESENTATION

A method of identifying a parameter set for decoding a multi-layer video representation. The method includes identifying the parameter set based on a parameter set identifier and one or more layer identifiers indicating a layer of the video representation. Optionally, the method may further include returning the identified parameter set from a parameter set database, and activating the parameter set. Identifying parameter sets using both a parameter set identifier and one or more layer identifiers is advantageous in that the length of the parameter set identifier codeword may be shorter. This results in bitrate savings, since the number of bits which need to be transmitted is reduced. Corresponding computer program products and video decoders for decoding a multi-layer video representation are disclosed. 1. A method of identifying a valid parameter set for decoding a multi-layer video representation , the method comprising:Identifying the parameter set based on a parameter set identifier and one or more layer identifiers indicating a layer of the video representation.2. The method according to claim 1 , wherein the parameter set is valid for a range of values of the one or more layer identifiers.3. The method according to claim 2 , wherein the range of values is indicated in a Network Abstraction Layer claim 2 , NAL claim 2 , unit header of the parameter set.4. The method according to claim 1 , wherein the parameter set is a Picture Parameter Set claim 1 , PPS claim 1 , the parameter set identifier is a PPS identifier obtained from a slice header of a coded slice of the video representation claim 1 , and the one or more layer identifiers are obtained from a Network Abstraction Layer claim 1 , NAL claim 1 , unit header of the coded slice.5. The method according to claim 1 , wherein the parameter set is a Sequence Parameter Set claim 1 , SPS claim 1 , the parameter set identifier is an SPS identifier obtained from a Picture Parameter Set claim 1 , PPS claim 1 , and ...

Method and arrangement for video transcoding using mode or motion or in-loop filter information

In a method of transcoding of a video bitstream by a transcoder arrangement, performing the steps of receiving (S10) a video bitstream with a predetermined input video format, receiving (S20) side information related to the video bitstream, the side information comprising at least one of mode or motion or in-loop filter information relating to at least one other predetermined video format for the video bitstream. Further, performing the steps of decoding (S40) the received side information to generate transcoding guiding information, and encoding (S50) a representation of the received video bitstream based at least on the generated transcoding guiding information, to provide a transcoded video bitstream with a predetermined output video format.

VIEW SYNTHESIS USING LOW RESOLUTION DEPTH MAPS

View synthesis is performed based on obtained texture data and a depth map. The resolution of the depth map is lower than that of the texture data by a ratio dw in the x direction and by a ratio dh in the y direction. Texture pixel positions x, y are transformed into non-integer depth map pixel positions by performing divisions x/dw and y/dh and these non-integer depth map pixel positions are rounded to integer depth map pixel positions, and a view is synthesized based at least on the obtained texture data and depth map values at the integer depth map pixel positions and/or adjacent positions. 115-. (canceled)16. A method of performing view synthesis , comprising:obtaining texture data comprising pixels arranged along an x direction and arranged along a y direction;obtaining a depth map, the depth map associated with the obtained texture data and where the resolution of the depth map is lower than that of the texture data by a ratio dw in the x direction and by a ratio dh in the y direction;transforming texture pixel positions x, y into non-integer depth map pixel positions by performing divisions x/dw and y/dh;rounding the non-integer depth map pixel positions to integer depth map pixel positions; andsynthesizing a view based at least on the obtained texture data and lower resolution depth map values adjacent to the integer depth map pixel positions and lower resolution depth map values at the integer depth map pixel positions, wherein the depth values at the integer depth map pixel position and adjacent positions are combined by means of a dilation operation.17. The method of claim 16 , wherein the synthesizing of the view is performed using depth map values that are functions of the depth map values at the integer depth map pixel positions claim 16 , depth map values at positions adjacent to the integer depth map pixel positions and rounding errors obtained in the rounding of the non-integer depth map pixel positions to integer depth map pixel positions.18. The ...

METHODS AND ARRANGEMENTS FOR SUPPORTING VIEW SYNTHESIS

Arrangements and methods therein for supporting view synthesis. One method is performed by an arrangement which is operable to receive an input video stream comprising an input view associated with a first camera position. The method includes receiving a measure M_D of a maximum difference in depth or disparity value between two pixels in a depth or disparity map representing the depth or disparity information of a video frame of the input view. The method further includes determining a maximal distance d_cam, from the first camera position to a second camera position, based on the received measure; and indicating the determined distance d_cam to a view synthesizer. This can enable the view synthesizer to synthesize a view associated with a second camera position so that disocclusions due to the distance between the first and second camera position may be handled. 1. Method for supporting view synthesis , performed by an arrangement operable to receive an input video stream comprising an input view associated with a first camera position , the method comprising:{'b': '101', 'receiving () a measure M_D of a maximum difference in depth or disparity value between two pixels in a depth or disparity map representing the depth or disparity information of a video frame of the input view;'}{'b': '102', 'determining () a maximal distance d_cam, from the first camera position to a second camera position, based on the received measure; and'}{'b': '103', 'indicating () the determined distance d_cam to a view synthesizer, thus enabling the view synthesizer to synthesize a view associated with a second camera position such that disocclusions due to the distance between the first and second camera position may be handled.'}2. Method according to claim 1 , wherein the two pixels are located in the proximity of each other along an axis in the plane of the depth or disparity map.3. Method according to or claim 1 , wherein the two pixels are horizontally or vertically adjacent.43. ...

Video bitstream processing for enabling tune-in

Chunks (12, 14) of encoded video data of a streamed video bitstream (1) are stored and encoded video data is decoded to form decoded video data to be output for display. A selected portion (12) of the stored chunks (12, 14) or selected sub-chunks (25, 27) of the stored chunks (20, 22) for a previous, already played out part (3) of the streamed video bitstream (1) is or are discarded while keeping selected stored chunks (14) or selected sub-chunks (21, 23) stored as navigation tune-in points. The usage of selected stored chunks (14) or sub-chunks (21, 23) that are not discarded from the already played out part (3) of the streamed video bitstream (1) enables a low delay solution during video navigation when a user wants to jump to a previously played out position (5) within the streamed video bitstream (1).

METHOD AND ARRANGEMENT FOR VIDEO TRANSCODING USING MODE OR MOTION OR IN-LOOP FILTER INFORMATION

In a method of transcoding of a video bitstream by a transcoder arrangement, performing the steps of receiving (S) a video bitstream with a predetermined input video format, receiving (S) side information related to the video bitstream, the side information comprising at least one of mode or motion or in-loop filter information relating to at least one other predetermined video format for the video bitstream. Further, performing the steps of decoding (S) the received side information to generate transcoding guiding information, and encoding (S) a representation of the received video bitstream based at least on the generated transcoding guiding information, to provide a transcoded video bitstream with a predetermined output video format. 136-. (canceled)37. A method of transcoding of a video bitstream by a transcoder arrangement , comprising:receiving a video bitstream with a predetermined input video format;receiving side information related to said video bitstream, said side information comprising at least one of mode or motion or in-loop filter information relating to at least one other predetermined video format for said video bitstream;decoding said received side information to generate transcoding guiding information; andencoding a representation of said received video bitstream based at least on said generated transcoding guiding information, to provide a transcoded video bitstream with a predetermined output video format.38. A transcoder arrangement for transcoding of a video bitstream , comprising:a video receiver configured for receiving a video bitstream with a first predetermined input video format; a side information receiver configured for receiving side information related to said video bitstream, said side information comprising at least one of mode or motion or in-loop filter information relating to at least one other predetermined video format for said video bitstream, and', 'a side information decoder configured for decoding said received side ...

3D VIDEO WARNING MODULE

There is provided a 3D video warning module comprising an input, a processor, and an output. The input is for receiving: capture information from a 3D capture device, and display information from at least one 3D display device, wherein the 3D display device is for displaying 3D video captured by the 3D capture device. The processor is for analyzing the capture information and the display information, the processor arranged to identify at least one issue (an incompatibility). The output is for sending a notification of the issue to at least one of the 3D capture device and the 3D display device. 1. A 3D video warning module comprising:an input for receiving:capture information from a 3D capture device, anddisplay information from at least one 3D display device, wherein the 3D display device is for displaying 3D video captured by the 3D capture device;a processor for analyzing the capture information and the display information, the processor arranged to identify at least one issue; andan output for sending a notification of the issue to at least one of the 3D capture device and the 3D display device.2. The 3D video warning module of claim 1 , wherein the notification of the issue sent to the 3D capture device comprises modified capture parameters in order to resolve the issue.3. The 3D video warning module of claim 1 , wherein the notification sent to the 3D display device is a warning of an issue.4. The 3D video warning module of claim 1 , wherein: the input is also for receiving 3D video captured by the 3D capture device; and the processor is for analyzing the 3D video.5. The 3D video warning module of claim 1 , wherein the capture information comprises at least one of: sensor width claim 1 , sensor resolution claim 1 , focal length claim 1 , sensor shift claim 1 , baseline claim 1 , encoding parameters claim 1 , and depth range.6. The 3D video warning module of claim 1 , wherein the display information comprises at least one of: screen width claim 1 , screen ...

ENCODING AND DERIVING PARAMETERS FOR CODED MULTI-LAYER VIDEO SEQUENCES

A method of deriving parameters required for decoding a current layer of a coded multi-layer video sequence. The method comprises deriving a required parameter from one or more parameters associated with the current or a lower layer of the multiple layers. The invention makes use of an understanding that parameters which are required for decoding a current higher layer of a multi-layer video representation may be derived, i.e., inferred or predicted, from parameters associated with lower layers rather than explicitly signaled in a parameter set associated with the current layer. Also disclosed are a method of encoding parameters associated with such a current layer, corresponding computer program products, a corresponding parameter set decoder, and a corresponding parameter set encoder.

method and arrangement for video encoding

método e disposição para codificação de vídeo. métodos e disposições na codificação de vídeo e entidades de decodificação. os métodos e disposições referem-se à codificação de articulação de informação de referência associada com vídeo codificado. o método e disposição in a entidade de decodificação refere-se a obtenção de (402) um elemento de sintaxe única asscoiado com um bloco codificado be, e identificação (404) um modo de referência e uma ou mais imagens de referência baseada no elemento de sintaxe obtido. o método e disposição ainda refere-se à decodificação (406) do bloco be baseada no modo de referência identiicado e uma ou mais imagens de referência, assim fornecendo um bloco decodificado, b, de pixels. method and arrangement for video encoding. methods and arrangements for video encoding and decoding entities. The methods and arrangements refer to the reference information articulation coding associated with encoded video. the method and arrangement in the decoding entity refers to obtaining (402) a single syntax element associated with a b coded block, and identifying (404) a reference mode and one or more reference images based on the decoding element. obtained syntax. The method and arrangement further relates to decoding 406 of block b and based on the identified reference mode and one or more reference images, thereby providing a decoded block b of pixels.

Method and arrangement for video coding

Methods and arrangements in video encoding and decoding entities. The methods and arrangements relate to the joint encoding of reference information associated with encoded video.T he method and arrangement in a decoding entity relate to obtaining (402) a single syntax element associated with an encoded block Be,and identifying (404) a reference mode and one or more reference pictures based on the obtained syntax element. The method and arrangement further relate to- decoding (406)of the block Be based on the identified reference mode and one or more reference pictures, thus providing a decoded block, B, of pixels.

Apparatus and method for tuning to a channel of a moving pictures expert group transport stream (mpeg-ts)

A method and apparatus for tuning to a channel of a Moving Pictures Expert Group transport stream (MPEG-TS), for example used in an Internet Protocol Television (IPTV) network, are provided for optimising a channel change procedure. The method comprises the steps of receiving a MPEG transport stream at a first bit rate, the MPEG transport stream comprising a plurality of television channels. Program clock reference (PCR) values are identified in the received MPEG transport stream, and one or more of the program clock reference (PCR) values are adjusted. The MPEG transport stream, including the adjusted program clock reference values, are transmitted at a second bit rate, for example to a receiver device such as a set top box, thereby enabling the set top box to perform a channel change procedure more quickly.

Technique for determining usage of encrypted media content

A technique for determining usage of encrypted media content is described. A method implementation of this technique comprises the steps of obtaining a short-term key for decrypting the media content, obtaining a long-term key for decrypting the short-term key, decrypting the short-term key based on the long-term key, decrypting the media content based on the decrypted short-term key, and logging a parameter relating to the short-term key as a basis for determining media content usage. The short-term key may be a Traffic Encryption Key, TEK, and the long-term key may be a Service Encryption Key, SEK.

methods for a video encoder, video transcoder and video processing node, video encoder, video transcoder, video processing node, and, computer program

de acordo com um aspecto, a presente invenção refere-se a um método para um codificador de vídeo. o método compreende prover (601) para um transcodificador um primeiro fluxo contínuo de bits que representa uma sequência de vídeo com um primeiro formato, criar (602) um segundo fluxo contínuo de bits que representa a informação de transcodificação indicativa de um método de transcodificação que deve ser usado pelo transcodificador para transcodificação da sequência de vídeo do primeiro formato para um segundo formato e prover (603) para o transcodificador o segundo fluxo contínuo de bits. According to one aspect, the present invention relates to a method for a video encoder. the method comprises providing (601) to a transcoder a first continuous stream of bits representing a first format video sequence, creating (602) a second continuous stream of bits representing transcoding information indicative of a transcoding method which shall be used by the transcoder for transcoding the video sequence from the first format to a second format and providing (603) for the transcoder the second continuous stream of bits.

Apparatus and method for tuning to a channel of a moving pictures expert group transport stream (mpeg-ts)

A method and apparatus for tuning to a channel of a Moving Pictures Expert Group transport stream (MPEG-TS), for example used in an Internet Protocol Television (IPTV) network, are provided for optimising a channel change procedure. The method comprises the steps of receiving a MPEG transport stream at a first bit rate, the MPEG transport stream comprising a plurality of television channels. Program clock reference (PCR) values are identified in the received MPEG transport stream, and one or more of the program clock reference (PCR) values are adjusted. The MPEG transport stream, including the adjusted program clock reference values, are transmitted at a second bit rate, for example to a receiver device such as a set top box, thereby enabling the set top box to perform a channel change procedure more quickly.

Technique for bringing encoded data items into conformity with a scalable coding protocol

A technique for making media content in the form of encoded data items decodable by a decoder operating in accordance with a scalable coding protocol that defines two or more media layers is provided. A method implementation of this technique comprises the steps of generating one or more dummy data items that define a first media layer of the scalable coding protocol, and marking the encoded data items as belonging, to a second media layer of the scalable coding protocol.

Synchronization of cameras for multi-view session capturing

Play-out control for a media data stream

A technique for controlling a play-out of a media data stream at a receiving device is provided. The media data stream comprises one or more programs, and each program comprises one or more program components. In a method implementation of the technique, a zone description is defined. The zone description is defined for a media zone for at least one program or at least one program component in the media stream and identifies the media zone for the at least one program or the at least one program component. In a next step, the zone description is associated to a program specific information data segment. The program specific information data segment is part of the media stream and comprises data specifying information at least regarding to the at least one program or at least one program component. The method also comprises transmitting the media data stream towards the receiving device.

Method and apparatus for creating a disocclusion map used for coding a three-dimensional video

Method and arrangement for video coding

Indicating bit stream subsets

A method of indicating bit stream subsets in a video bit stream (210) is provided. The method comprises receiving the bit stream,dividing the bit stream into video packets (211–216), wherein each packet comprises either one of video data or supplemental information, and marking each packet with a single subset identifier (stream_id). Each subset identifier is associated with a corresponding bit stream subset (221–223). Further, a method of extracting video packets from a video bit stream is provided. The method comprises providing relevant subset identifiers,receiving video packets from the bit stream, and, for each received packet, inspecting the subset identifier of the packet. The packet is extracted if the subset identifier matches one of the relevant subset identifiers. This allows condensing properties of a bit stream subset into a single identifier, thereby simplifying the processing of video packets in the network and on the client side. Further, devices corresponding to the aforementioned methods are provided.

Video transcoding

The embodiments relate to transcoding a coding tree unit (CTU) (10) in a picture (2) of a video sequence (1). The video sequence is High Efficiency Video Coding ,HEVC, video sequence and said coding tree unit (10) comprises one or multiple coding units of pixels. An input encoded representation of the CTU (10) is decoded to obtain coding parameters for the input encoded representation. The input encoded representation is an HEVC encoded representation and said coding tree unit (10) is recursively split in a quad-tree structure of coding units based on said coding parameters. The coding parameters are used to determine a search sub-space consisting of a subset of all possible combinations of candidate encoded representations of the CTU (10) in which each coding unit has a same or neighboring intra prediction mode as a coding unit: i) defined in said input encoded representation, ii) having intra prediction as prediction mode, and iii) occupying a same area of said picture (2) as said coding unit. The CTU (10) is encoded to get an output encoded representation of the CTU belonging to the search sub-space.

Method and configuration of transcoding video bitstream

【課題】ビットストリームを入力フォーマットから出力フォーマットにトランスコーディング（変換）する方法及び構成を提供する。 【解決手段】高忠実度ビデオストリームの受信ステップＳ１０と、該ストリームのサイド情報の受信ステップＳ２０とを備える。サイド情報は、低忠実度で元の動画像を表すストリームと、元の動画像に最適の符号化パラメータと、元の動画像と高忠実度復号画像との間の残差変換係数とを含む。変換案内情報を生成するためのサイド情報の復号ステップＳ４０と、受信ストリーム及び生成された変換案内情報に基づく低忠実度のストリーム表現の推定ステップＳ５０と、低忠実度のストリームの推定表現の改善の為、サイド情報の変換係数を前記低忠実度のストリームの推定表現から得られた変換係数に加算するステップＳ６０と、低忠実度のストリームの改善された推定表現の符号化ステップＳ７０とを更に備える。 【選択図】図３

Method and arrangement for processing of encoded video

Provision of marked data content to user devices of a communications network

The invention refers to a method to be used in a telecommunication network for providing individually marked digital signals (S1, S2) to be transmitted to a plurality of recipient user devices (UE1, UE2), wherein a content digital signal (SO) is received together with one or a plurality of mark signals (M1, M2), and wherein an individually marked signal (S1, S2) to be provided to one of the user devices (UE1, UE2) is generated by combining the content signal (SO) with one or a plurality of mark signals (M1, M2). The invention further refers to a program and to devices for performing the method.

Apparatus and method for tuning to a channel of a moving pictures expert group transport stream (mpeg-ts)

A method and apparatus for tuning to a channel of a Moving Pictures Expert Group transport stream (MPEG-TS), for example used in an Internet Protocol Television (IPTV) network, are provided for optimising a channel change procedure. The method comprises the steps of receiving a MPEG transport stream at a first bit rate, the MPEG transport stream comprising a plurality of television channels. Program clock reference (PCR) values are identified in the received MPEG transport stream, and one or more of the program clock reference (PCR) values are adjusted. The MPEG transport stream, including the adjusted program clock reference values, are transmitted at a second bit rate, for example to a receiver device such as a set top box, thereby enabling the set top box to perform a channel change procedure more quickly.

Auxiliary information map upsampling

An auxiliary information map (10) is upsampled to form an upsampled auxiliary information map (20). Multiple reference pixels (23) in the upsampled auxiliary information map (20) are selected for a current pixel (21) in the upsampled auxiliary information map (20) based on texel values of texels in an associated texture (30). An updated pixel value is calculated for the current pixel (21) based on the pixel values of the selected reference pixels (23).

Auxiliary information map upsampling

Client entity, network entity and data replacement entity

The present invention relates to a client entity being capable of communicating over a communication network. The client entity comprises a receiver (101) for receiving scheduled data and for receiving a quality indicator indicating a quality of the scheduled data, a quality monitor (103) for monitoring the quality of the scheduled data upon the basis of the quality indicator, a processor (105) for providing a data replacement request if the quality of the scheduled data fails to meet a quality requirement, and a transmitter (107) for transmitting the data replacement request towards the communication network to request replacement data representing another version of the scheduled data.

Method and apparatus for creating a disocclusion map used for coding a three-dimensional video

It is presented a method for creating a disocclusion map used for coding a three- dimensional, 3D, video, the method comprises receiving (800) a pixel-based disocclusion map in which pixels are marked either as disoccluded or not. A block- based disocclusion map is derived (802) based on the pixel-based disocclusion map. An area of the block-based disocclusion map that has been marked as disoccluded is extended (804). It is also presented an encoder (30), a decoder (32) and a system for creating the disocclusion map.

Encoding and decoding a video frame in separate processing units

Encoder, method in an encoder, decoder and method in a decoder for providing information concerning a spatial validity range

Methods (700, 900) for providing information from an encoder (220) to a decoder (230) concerning a spatial validity range, at which view synthesis of an image at a virtual camera position can be performed with sufficient visual quality, based on a view of at least one real camera (210-1) comprised in a set of real cameras (210-1, 210-2, 210-3, 210-4). The methods (700, 900) comprises determining (701) the spatial validity range of the at least one real camera (210-1), which spatial validity range specifies for the decoder (230) what information to use for synthesising the image of the virtual camera position. Also, the determined (701) spatial validity range is transmitted (706) to the decoder (230).

Fast channel switching in tv broadcast systems

The invention relates to a technique for supporting a fast channel switching in broadcast systems or similar systems for the distribution of media data, for example mobile TV data, in a point-to-multipoint ('PTM') fashion. A method embodiment of the technique for supporting a fast channel switching in a system (100) comprising multiple PTM primary channels is performed in a transmitter (102) and comprises the steps of transmitting pictures (P) on each of the multiple PTM primary channels; and transmitting channel switching information ('CSI') items on a secondary channel for supporting a fast channel switching, wherein each CSI item allows a determination of an intra-coded picture of one of a pair of primary channels at a receiver side based on a picture of the other of the pair of primary channels.

Video bitstream processing for enabling tune-in

Chunks (12, 14) of encoded video data of a streamed video bitstream (1) are stored and encoded video data is decoded to form decoded video data to be output for display. A selected portion (12) of the stored chunks (12, 14) or selected sub-chunks (25, 27) of the stored chunks (20, 22) for a previous, already played out part (3) of the streamed video bitstream (1) is or are discarded while keeping selected stored chunks (14) or selected sub-chunks (21, 23) stored as navigation tune-in points. The usage of selected stored chunks (14) or sub-chunks (21, 23) that are not discarded from the already played out part (3) of the streamed video bitstream (1) enables a low delay solution during video navigation when a user wants to jump to a previously played out position (5) within the streamed video bitstream (1).

Multicasting technique for scalably encoded media layers

A technique for distributing in a multicasting network media content via two or more media layers is described. The media layers are hierarchically arranged in accordance with a scalable coding protocol such as the Scalable Video Coding (SVC) protocol. In a method implementation of this technique, in a first step a first number of media recipients for a first media layer that is transmitted via a first bearer of the multicasting network is determined. Then, a second bearer of the multicasting network for at least one second media layer is selected taking into account the first number and a hierarchical relationship between the first media layer and the second media layer.

Thinning of packet-switched video data

This invention relates to a method and to a system for thinning a stream of packet-switched video data in which a stream of packet-switched video data is detected and the size of the packets in the video stream is determined, wherein packets of the video stream data are dropped depending on the size of the packets.

Scalable video coding method, encoder and computer program

A scalable video coding method for coding a video sequence (10) results in a bit stream (20} partitionable into two layer representations (20 1 , 2O 2 ) of the video sequence (10). The second layer representation (2O 2 ) has an enhanced resolution compared to the first layer representation (2O 1 .). The method includes generating (si) predictive coding parameters for the second layer using previously reconstructed pixels (14) in the second layer. The method further includes performing (s2) prediction for the first layer, using the predictive coding parameters and the previously reconstructed pixels (14) in the second layer, to generate a first layer prediction signal. The method further includes generating (s3) a first layer residual, based on the difference between the original image and the first layer prediction signal. The predictive coding parameters and the first layer residual are coded (s4) as the first layer representation (2O 1 ). An encoder (30) and computer program are also provided.

Encoding and decoding a video frame in separate processing units

It is presented a method for encoding a video frame of a piece of video content. The method is performed in an encoder device and comprises the steps of: dividing the video frame into a set of non-overlapping regions, wherein the set comprises at least one region; assigning each region, in the set of regions, to a separate processing unit; encoding, in each processing unit, picture data of the respective region; collecting progress data from each processing unit, the progress data indicating progress of the encoding of the respective region; and dividing a particular region into a plurality of smaller regions and assigning each smaller region to a separate processing unit, when the progress data indicates that progress of encoding the particular region is insufficient.

Methods, encoder, and transcoder for transcoding

The present invention relates to an encoder, transcoder and a method for transcoding a bitstream representing an original video source from an input video format to an output video format. The method comprises receiving the bitstream with the input video format and side information related to the video. Decode the side information to generate transcoding guiding information, estimate a representation of the received bitstream and transform coefficients with a second video format based on the received bit stream and the generated transcoding guiding information, determining a first set of transform coefficients from the estimated transform coefficients wherein the first set captures the main characteristics of the original transform coefficients, determining a second set of transform coefficients from the side information wherein the set corresponds to same positioning within a transform block as the transform coefficients of the first set and adding the second set of transform coefficients to the first set of the transform coefficients, to create refined transform coefficients that better captures the characteristics of the original transform coefficients and encode the estimated representation of the received bitstream with the second video format using the created refined transform coefficients.

Verdünnung von paketvermittelten videodaten

Multicasting technique for scalably encoded media layers

A technique for distributing in a multicasting network media content via two or more media layers is described. The media layers are hierarchically arranged in accordance with a scalable coding protocol such as the Scalable Video Coding (SVC) protocol. In a method implementation of this technique, in a first step a first number of media recipients for a first media layer that is transmitted via a first bearer of the multicasting network is determined. Then, a second bearer of the multicasting network for at least one second media layer is selected taking into account the first number and a hierarchical relationship between the first media layer and the second media layer.

Motion vector processing

The embodiments relates to motion vector prediction and decoding for multi-view video content from multiple camera views (10, 20). At least one candidate motion vector predictor (44, 54) is provided for a current motion vector (34) to be encoded. A motion vector predictor (44) is then determined from the at least one candidate motion vector predictor (44, 54). Correspondingly, during decoding a motion vector (34) is determined for a current pixel block (30) based on a motion vector predictor (44) determined for the current pixel block (30).

Method and arrangement for transcoding a video bitstream

The present invention relates to a method and a transcoder arrangement of transcoding a bitstream representing an original video source from an input format to an output format. The method comprises the steps of receiving (S 10 ) the bitstream with the input video format, wherein the input video format is a high fidelity format; and receiving (S 20 ) side information related to said video bitstream. Said side information comprising at least: a video bitstream representing the original video source with a low fidelity input video format, coding parameters optimized based on knowledge of the original video source; transform coefficients, indicative of a residual between the original video source and a decoded version of the high fidelity format. The method further comprises decoding (S 40 ) said received side information to generate transcoding guiding information, estimating (S 50 ) a representation of said bitstream with a low fidelity output format based on the received bit stream and the generated transcoding guiding information, adding (S 60 ) the transform coefficients of the side information to transform coefficients generated from the estimated representation of said bitstream with the low fidelity output format to improve the estimated representation of said bitstream with the low fidelity output format and encoding (S 50 ) the improved estimated representation of said bitstream with the low fidelity output format.