Abstract: A method and apparatus for adaptively transmitting and receiving media data to a streaming environment by segmenting into segments a plurality of media data, which is generated by encoding content to have different qualities.

Abstract: A method and apparatus for performing streaming that is adaptive to a streaming environment, using information about a plurality of media data generated by encoding content to have different qualities.

Abstract: Provided are a method and apparatus for receiving and providing data. The method of receiving data includes: receiving first information including information about a first interval of a plurality of media data generated by encoding content in different qualities; acquiring renewal time information indicating a point of time for a first file to be renewed by using the first information; and receiving second information comprising information about a second interval of the plurality of media data based on the renewal time information.

Abstract: A method and apparatus for reproducing media data are provided. The method includes: receiving a first file including information about a period of first content and information about a period of second content; receiving and reproducing media data of the first content based on the received first file; stopping reproducing of the media data of the first content and receiving and reproducing media data of the second content based on the first file; and receiving and reproducing the media data of the first content when the reproducing the media data of the second content is completed, wherein the information about the period of the second content includes location information about the second media data of the second content or location information of a second file including the location information about the second media data of the second content.

Abstract: A method and apparatus for transmitting and receiving data are provided. In the method of receiving data, at least one of a plurality of media data generated by encoding content to have different qualities is received, the plurality of media data each including at least one segment; location information indicating a randomly accessible point of each of the at least one segment is obtained; and random accessing is provided on the received media data, based on the location information.

Abstract: A method and apparatus are provided for performing adaptive streaming according to a streaming environment based on information about a plurality of elements for determining qualities of a plurality of media data with respect to the same content.

Abstract: A streaming method and apparatus, in which information regarding a plurality of chapters of content is inserted into a media presentation description that includes information regarding a plurality of media data generated by encoding the content so as to have different qualities, and then, streaming is performed based on the information.

Abstract: Provided are a method of generating a forward error correction (FEC) packet for scalable video streaming and a server and a client apparatus using the same. The method includes generating a plurality of temporal layers (TLs) of which the number is a second number to provide temporal scalability for one group of pictures (GOP) constituted of a plurality of frames of which the number is a first number, allocating FEC data to the TL, and generating a transmission packet by interleaving at least one of the FEC data and video data constituted of at least one frame for the TL. FEC can be performed without receiving all data by allocating FEC data in units of TLs, and hence a delay can be minimized. In addition, there is an advantage in that robustness to burst errors is provided by applying interleaving between video data and FEC data for the TLs.

Abstract: A method for generating and utilizing a bookmark in a streaming service system is provided. In a method for operating a server providing contents in an adaptive streaming service system, contents of a segment basis according to adaptive streaming is provided to a client. When a bookmark generate request message is received from the client, a bookmark generate request and segment identify information are transmitted to a bookmark server.

Abstract: A motion vector compression apparatus includes: a down-sampling module for down-sampling an original frame to have a size of a frame in each layer; a motion vector search module for obtaining a motion vector in which an error or a cost function is minimized with respect to the down-sampled frame; a reference vector generation module for generating a reference motion vector in a predetermined enhanced layer by means of a block of a lower layer corresponding to a predetermined block in the predetermined enhanced layer, and motion vectors in blocks around the block; and a motion difference module for calculating a difference between the obtained motion vector and the reference motion vector.

Abstract: A deblocking filter used in a video encoder/decoder based on a multilayer is disclosed. The deblocking filtering method includes choosing a present block and its neighboring block on which a deblocking filtering will be performed, judging whether the present block and the neighboring block have been coded by the intra BL mode, choosing a deblocking filter strength according to the result of the judgment, and performing the deblocking filtering with respect to a boundary between the present block and the neighboring block and according to the deblocking filter strength.

Abstract: A method and apparatus of improving the compression efficiency of a motion vector is provided. The method includes obtaining a motion vector in a base layer frame having a first frame rate from an input frame, obtaining a motion vector in a first enhancement layer frame having a second frame rate from the input frame, the second frame rate being greater than the first frame rate, generating a predicted motion vector by referring to a motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame if there is no base layer frame at the same temporal position as the first enhancement layer frame, and coding a difference between the motion vector in the first enhancement layer frame and the generated predicted motion vector, and the obtained motion vector in the base layer.

Abstract: A method and apparatus for providing a trick play service in a hypertext transfer protocol (HTTP) adaptive streaming (HAS) architecture for adaptively streaming media data according to fluctuation of a streaming environment are provided. The method at a server includes: generating a media presentation description (MPD) file including information about at least one piece of trick play data; transmitting the MPD file to a client; and transmitting the at least one piece of trick play data to the client in response to a request by the client based on the MPD file. The method at a client includes: receiving a media presentation description (MPD) file including information about at least one piece of trick play data; and receiving the at least one piece of trick play data from a server based on the MPD file.

Abstract: An information file pertaining to media data includes reproduction rating information for each of a plurality of segments. The information file is used by a client to determine what segment or segments to request from a server. The server responds to the request by sending the segment or segments to the client. Since the reproduction rating information may be provided for each of the segments, the selection of the segment or segments by the client can take into account a reproduction rating threshold.

Abstract: A method and apparatus of improving the compression efficiency of a motion vector is provided. The method includes obtaining a motion vector in a base layer frame having a first frame rate from an input frame, obtaining a motion vector in a first enhancement layer frame having a second frame rate from the input frame, the second frame rate being greater than the first frame rate, generating a predicted motion vector by referring to a motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame if there is no base layer frame at the same temporal position as the first enhancement layer frame, and coding a difference between the motion vector in the first enhancement layer frame and the generated predicted motion vector, and the obtained motion vector in the base layer.

Abstract: A motion vector compression apparatus includes: a down-sampling module for down-sampling an original frame to have a size of a frame in each layer; a motion vector search module for obtaining a motion vector in which an error or a cost function is minimized with respect to the down-sampled frame; a reference vector generation module for generating a reference motion vector in a predetermined enhanced layer by means of a block of a lower layer corresponding to a predetermined block in the predetermined enhanced layer, and motion vectors in blocks around the block; and a motion difference module for calculating a difference between the obtained motion vector and the reference motion vector.

Abstract: A method and apparatus of improving the compression efficiency of a motion vector by efficiently predicting a motion vector in an enhancement layer from a motion vector in a base layer in a video coding method using a multi-layer are provided.

Abstract: A method and apparatus are provided for performing adaptive streaming according to a streaming environment based on information about a plurality of elements for determining qualities of a plurality of media data with respect to the same content.

Abstract: A method and an apparatus for elevating compression efficiency of a motion vector by effectively predicting a motion vector of an enhanced layer by means of a motion vector of a base layer in a video coding method employing a multi-layer structure are disclosed. A motion vector compression apparatus includes: a down-sampling module for down-sampling an original frame to have a size of a frame in each layer; a motion vector search module for obtaining a motion vector in which an error or a cost function is minimized with respect to the down-sampled frame; a reference vector generation module for generating a reference motion vector in a predetermined enhanced layer by means of a block of a lower layer corresponding to a predetermined block in the predetermined enhanced layer, and motion vectors in blocks around the block; and a motion difference module for calculating a difference between the obtained motion vector and the reference motion vector.

Abstract: A method and apparatus for providing a trick play service in a hypertext transfer protocol (HTTP) adaptive streaming (HAS) architecture for adaptively streaming media data according to fluctuation of a streaming environment are provided. The method at a server includes: generating a media presentation description (MPD) file including information about at least one piece of trick play data; transmitting the MPD file to a client; and transmitting the at least one piece of trick play data to the client in response to a request by the client based on the MPD file. The method at a client includes: receiving a media presentation description (MPD) file including information about at least one piece of trick play data; and receiving the at least one piece of trick play data from a server based on the MPD file.