Abstract: In order to prevent a deterioration in reproduction quality of a moving picture, which is caused by a difference in data transfer rate for each frame of the moving picture data, when compressing the picture data, a bit rate of the compressed data is predicted, thus deriving a prediction value of the data transfer rate after the compression. The compression is performed by modifying the picture so that the prediction value falls within a range which is suitable for a data transfer rate set in advance. The modification of the picture data is performed by writing a pattern for the adjustment into frames of the original picture.

Abstract: A method for editing audio data includes the steps of creating a header portion containing at least information for indicating a start of an audio unit to be decoded and having composite elements whose values are equal to those of the audio data to which dummy data is to be added, and creating the audio data composed of the dummy data to be ignored during a decoding time. The system for editing audio data is also provided for executing the editing method.

Abstract: In order to prevent a deterioration in reproduction quality of a moving picture, which is caused by a difference in data transfer rate for each frame of the moving picture data, when compressing the picture data, a bit rate of the compressed data is predicted, thus deriving a prediction value of the data transfer rate after the compression. The compression is performed by modifying the picture so that the prediction value falls within a range which is suitable for a data transfer rate set in advance. The modification of the picture data is performed by writing a pattern for the adjustment into frames of the original picture.