1. A method for setting a motion vector of a digital video to be displayed on a display device, comprising: (a) identifying two motion vectors having a highest correlation between each other out of motion vectors of four adjacent macroblocks in a portion of the digital video, at least one of the motion vectors pointing in a substantially different direction from the motion vectors of one or more remaining ones of the four adjacent macroblocks; (b) calculating a first value based on an average of the two motion vectors having the highest correlation between each other; (c) calculating a final motion vector based on the first value; (d) reducing a resolution of the four adjacent macroblocks to form one or more smaller-sized macroblocks; (e) assigning the final motion vector to the one or more smaller-sized macroblocks; and (f) repeating (a)-(e) for 0 to N additional rectangular arrangements of four adjacent macroblocks in the digital video, where N is an integer equal to or greater than 1; forming a reduced-resolution version of the digital video based on (e) and (f); and storing or transmitting the reduced-resolution digital video for display on the display device, wherein (a)-(e) are preformed by a computer.