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In Korea, a nation-wide digital multimedia broadcasting (DMB) service was to be launched in 2004 to provide high quality digital audio, video and data broadcasting to mobile, portable, and fixed receivers. We have developed the world's first FPGA implementation of a portable DMB receiver complete with an RF receiver, a 6.4-inch LCD display, and audio/video/data decoders. We present the real-time video decoder designed and implemented for this DMB receiver. The video coding in DMB, is based on the newest international video coding standard known as MPEG-4 Part 10 AVC/H.264. We describe the low-power high-performance design of the H.264-based DMB video decoder and illustrate its performance based on the FPGA implementation.