Dynamic frame-skipping transcoding with motion information considered

Frame-skipping transcoding is an efficient tool for reducing the bit rate when transmitting precoded video over bandwidth-constrained channels. In this process, the motion information is an important factor to be considered. Traditional methods consider only the motion activity information in dynamic frame-skipping transcoding. The concept of motion change is introduced to evaluate motion continuity. Combined with the motion activity information, these two parts of motion information are used to dynamically skip frames without seriously affecting the visual quality. A new frame-skipping scheme with a variable length prediction window is also proposed. Experimental results show that the proposed method can present a smooth frame rate variation, and well preserve the original motion information with tolerable delay. At the same time, spatial quality is also improved.