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Packet losses or errors of high compressed video stream during transmission over error-prone channel may cause serious decline in video quality. Error concealment (EC) at decoder side is an effective technology to reduce this video degradation. This paper proposes a Dynamic Temporal Error Concealment (DTEC) algorithm for H.264, which chooses different error concealment approach according to the variance of motion vectors of available macro-blocks (MBs) around the lost MB. Furthermore, a recovery method based Directional Temporal Boundary Match Algorithm (DTBMA) is proposed. Experimental results show that the proposed algorithm not only increases PSNR but also improves subjective video quality compared with conventional temporal error concealment algorithms in the case of the same packet loss rate.