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This paper describes the design of multimedia software for a mobile device consisting of software and hardware decoders and accelerators for achieving the best video performance. The hardware system of the mobile device consists of multi format codec subsystem and color space converter. The multi format codec (MFC) supports the encoding and decoding of video/image data in five different formats. The multimedia software is designed so that it makes use of the hardware accelerators in the most efficient way. In the case of video formats that are not supported by the MFC, the multimedia application makes use of software video decoders. The paper gives an analysis of several design configurations and brings out the best design in terms of performance and processor usage for displaying video on mobile devices. An experimental analysis and results is given that demonstrates the efficiency and usefulness of the design.