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The corruption of compressed video bitstreams during their transmission over error-prone communication channels leads to degradation in the visual quality at the decoder. In order to effectively conceal the corrupted video data an exact error detection scheme is of utmost importance. In this paper, we present a new error detection scheme for the H.264/AVC using the RD optimized motion vector constraints to improve the error detection rate. The simulation results show that the detection rate of the proposed algorithm is about 86%, although the proposed scheme brings about a small amount of bitrate increment and causes a slight decrement in the PSNR during the encoding.