Abstract: Provided are a method and apparatus for transmitting digital multimedia broadcasting data, and a method and apparatus for receiving digital multimedia broadcasting data. A basic audio signal and a multichannel audio signal are encoded to generate a basic audio stream and a multichannel audio stream, and a first data stream describing property and position data of the basic audio stream and a second data stream describing property and position data of the multichannel audio stream are transmitted as independent streams. According to the performance of the receiving apparatus, an audio signal may be decoded by using just the first data stream only or both the first data stream and the second stream.

Abstract: A method of recognizing a location of a user including detecting the user's two eyes and mouth of their face is provided, which includes calculating a ratio of a distance between the two eyes to a distance between a middle point of the two eyes and the mouth, calculating a rotation angle of the face according to the ratio, and detecting a distance between the face and the camera based on the rotation angle.

Abstract: A method and apparatus for realistically playing content stimulating sight and hearing senses of a user corresponding to a location of the user, by determining a first location of a user, mapping a content space displayed on a display unit corresponding with an actual space in which the user is positioned based on the first determined location, determining a virtual viewpoint in the content space corresponding to a second location of the user, and playing content corresponding to the determined virtual viewpoint.

Abstract: Provided are a meta data encoding/decoding method and apparatus. The meta data decoding method includes decoding a media signal containing a media object, and decoding meta data corresponding to the media object. During the decoding of the meta data signal, decoding of the meta data is skipped when the meta data that is to be decoded is identical to already decoded meta data.

Abstract: A method of recognizing a location of a user including detecting the user's two eyes and mouth of their face is provided, which includes calculating a ratio of a distance between the two eyes to a distance between a middle point of the two eyes and the mouth, calculating a rotation angle of the face according to the ratio, and detecting a distance between the face and the camera based on the rotation angle.

Abstract: Provided are a meta data encoding/decoding method and apparatus. The meta data decoding method includes decoding a media signal containing a media object, and decoding meta data corresponding to the media object. During the decoding of the meta data signal, decoding of the meta data is skipped when the meta data that is to be decoded is identical to already decoded meta data.

Abstract: Provided are a method and apparatus for transmitting digital multimedia broadcasting data, and a method and apparatus for receiving digital multimedia broadcasting data. A basic audio signal and a multichannel audio signal are encoded to generate a basic audio stream and a multichannel audio stream, and a first data stream describing property and position data of the basic audio stream and a second data stream describing property and position data of the multichannel audio stream are transmitted as independent streams. According to the performance of the receiving apparatus, an audio signal may be decoded by using just the first data stream only or both the first data stream and the second stream.

Abstract: Provided are a meta data encoding/decoding method and apparatus. The meta data decoding method includes decoding a media signal containing a media object, and decoding meta data corresponding to the media object. During the decoding of the meta data signal, decoding of the meta data is skipped when the meta data that is to be decoded is identical to already decoded meta data.

Abstract: Provided are a meta data encoding/decoding method and apparatus. The meta data decoding method includes decoding a media signal containing a media object, and decoding meta data corresponding to the media object. During the decoding of the meta data signal, decoding of the meta data is skipped when the meta data that is to be decoded is identical to already decoded meta data.

Abstract: Provided are a method and apparatus for reproducing at least one piece of content received via at least one interface. The method includes classifying the at least one piece of content respectively received via the at least one interface according to a reference attribute, allocating the classified at least one piece of content to a virtual channel, and selecting a channel from among set channels that include the virtual channel and an occupied basic channel.

Abstract: Provided are a method of selecting the most suitable content reproducing apparatus on the basis of minimum resource information required to reproduce content and capability information of the content reproducing apparatus, and a content reproducing apparatus selector using the method. The method includes: receiving a content file, which includes minimum resource (MR) metadata including the minimum resource information required to reproduce content, from a content providing server or a content providing medium; receiving device level (DL) metadata per device from a plurality of content reproducing apparatuses, wherein the DL metadata includes capability information of the content reproducing apparatus; determining whether at least one of the content reproducing apparatuses described by the DL metadata can reproduce the content described by the MR metadata; and selectively renewing the MR metadata on the basis of a result of the determining.

Abstract: Provided is a method of executing a media file including at least one media resource, the method including: importing the media file including the media resource and media information that includes at least one digital item about the media resource, at least one template, and at least one application; and selecting one piece of the media information, and executing an event of one or more media resources associated with the media information, based on the selected one piece of the media information, wherein the digital item includes the media resource and identification information of each media resource, the template includes an event of the at least one digital item and execution environment information of the event, the application includes association information of the template and the digital item, and the media information is adapted to be imported and exported.

Abstract: A method of and apparatus for updating decoding information are provided. A method of transmitting media data includes generating a media stream including one or more media data items, one or more decoding information of the media stream, and information for arranging updating of the decoding information; and transmitting the media stream, the one or more decoding information item of the media stream, and the information for arranging updating of the decoding information, in which the one or more media data items have decoding information that are different from each other. According to the method and apparatus, the amount of data to be processed and the complexity of data processing can be reduced, thereby reducing an encoding time and a media data processing time in a decoder.

Abstract: Provided is a method for manipulating a media object in a media player and an apparatus using the same. The method includes generating a rendering map for managing a region of a media object in a rendering interface according to time, receiving a user input via the rendering interface; updating the rendering map based on a user input; re-composing a scene based on the updated rendering map, and rendering the media object according to the re-composed scene.

Abstract: Provided is a method of encoding media content and metadata. The method includes generating a scale indicator, which indicates a unit size of information about the media content, in the metadata, and determining data areas in the metadata that have different values based on the generated scale indicator. Accordingly, a range that can be expressed by the data area, that has a limited space in the metadata, can be increased.

Abstract: A method and apparatus for managing a media file are provided. The method of managing a media file comprising a plurality of media objects comprises correcting at least one media object from among the plurality of the media objects; generating or renewing information relating to unused regions generated in the media file according to the correction; and managing the media file based on the generated or renewed information. Therefore, difficulties in file management occurring due to correction of the media objects are reduced so that the media file can be efficiently managed.

Abstract: A method and an apparatus for generating and reproducing media object-based metadata are provided. The method includes generating a media stream which includes media objects and generating metadata which corresponds to each of the media objects. Each of the media objects includes metadata position information for accessing the corresponding metadata. The method facilitates real-time reproduction and modification of content.

Abstract: Provided are a method and apparatus for generating and accessing metadata in a media file format. The method of generating metadata in a media file format includes generating a time-track map composed of a plurality of map nodes that are distinguished according to track and unit time, and generating media objects corresponding to each of the map nodes, in which each of the map nodes includes position information of the corresponding media objects, thereby facilitating real-time reproduction and modification of content.

Abstract: Provided are a meta data encoding/decoding method and apparatus. The meta data decoding method includes decoding a media signal containing a media object, and decoding meta data corresponding to the media object. During the decoding of the meta data signal, decoding of the meta data is skipped when the meta data that is to be decoded is identical to already decoded meta data.

Abstract: A method for encoding metadata having a plurality of symbols is provided. The encoding method includes: determining an indication of a previously encoded symbol having substantially same symbol data as that of a current symbol that is to be encoded and encoding the current symbol based on the previously encoded symbol.