Importance

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Abstract

There is provided a device for forming, from original sound-attached moving-picture (video) data, sound-attached moving-picture data of a desired reproduction time which has a data amount smaller than that of the original sound-attached moving-picture data and are suitable to output the corresponding sounds and moving pictures at the same time. The original sound-attached moving-picture data are separated into moving-picture data and sound data. When the separated moving-picture data are moving-picture data which are encoded by orthogonal transform coding, for every frame, any portion representing high frequency components in the moving-picture data in each frame of the moving-picture data is deleted. A portion (reproduction target moving-picture data) of moving-picture data (in the deleted moving-picture data) obtained by encoding the frames whose number corresponds to an indicated reproduction time, and a portion (in the separated sound data) to be reproduced simultaneously with the reproduction target moving-picture data are multiplexed with each other. A multimedia data relay device in a network converts the data amount of data extracted from input information according to a regulation which is predetermined in accordance with the data type, and replaces the converted data by the data before the conversion processing and then output the data. A data converting device in a network performs data conversion processing on conversion target data of input information from a server according to a predetermined regulation, and transmits the converted data to a client. In addition, the data converting device stores the converted input information in the data converting device, and when the client demands the same data, the stored converted data are output to the client with no conversion processing. When data supplied from the server are video data, a correcting-function attached data conversion relay device reduces the size of images represented by the video data, and then supplies the size-converted data to the client. When the data demand from the client is a data demand containing coordinate values in the video data, the correcting-function attached data conversion relay device corrects the coordinate values by multiplying the coordinate values by the inverse number of the reduction ratio of the images, and transmits the data demand containing the corrected coordinate values to the server.

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First Claim