Variable frame rate transcoding considering motion information

Motion information is rather important to be considered in frame-skipping video transcoding. Traditionally methods consider only motion activity in dynamic frame skipping transcoding. In fact, motion continuity also has distinct effect on human visual perception. In this paper, we introduce a new concept of motion change. Combined with motion activity, these two motion information can be used to dynamically skip frames without seriously affecting our human perception. We also propose a new frame-skipping control scheme with variable length prediction window. Experimental results show that, our proposed method can present a smooth frame rate variation, and well comply with the original motion information.