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This work presents an intra frame prediction hardware architecture for H.264/AVC baseline/main profile encoder which performs real time processing of HDTV 1080p videos. It is achieved by exploring the parallelism of intra prediction and by reducing the latency for Intra 4times4 processing, which is the intra encoding bottleneck. Synthesis results on Xilinx Virtex-II Pro FPGA and TSMC 0.18 mum standard-cells indicate that this architecture is able to real time encode HDTV 1080p video operating at 110 MHz. Our architecture can encode HD1080p, 720p and SD video in real time at a frequency 25% lower when compared to similar works.