Integrating Fixed Size Compressed Multimedia Data Blocks for Storage and Retrieval

S. Nazir and M.Y. Javed (Pakistan)


Compression, continuous retrieval, companding, integration


Digital multimedia data (i.e audio, video, and text) are difficult to store and replay due to their real time nature and large size. The requirement of continuous retrieval, in the presence of multiple media streams whose display must proceed in a mutually synchronized manner are the distinguishing features that are unique to digital multimedia. In this study, the problem of integration of compressed media segments is addressed, which are sequences of continuously recorded video frames, audio samples, and text on disk, for storage and retrieval. Motion based JPEG has been used for the compression of video frames as it allows on-line processing and random access of video frames. Companding scheme has been used for audio compression, whereas uncompressed text is used. The schemes used for compression of audio and video data both yield a fixed length code to save on the buffering requirements. A mechanism for integration is proposed that can be applied to arrange video along with the associated audio and text, into fixed length media segments before storing them on disk. All the algorithms have been implemented in the C language.

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