Abstract: Video server should afford video frame skipping transcoding for users because of clients’ and network’s heterogeneity However, the video frame skipping algorithm that directly reuses the motion vector from the incoming bit stream results in degraded video quality Based on a forward dominant vector selection （FDVS） algorithm, discussed is the impact of different processing methods for motion vector out of range and forward intra dominant macroblock after the motion vector composition An intra refresh FDVS video transcoding algorithm is proposed Experimental results show that the algorithm can stop the error propagation efficiently, decrease the bit rate of video stream, and increase the video quality