a video apparatus with image memory function has a memory of three ports , memory read control units corresponding to two independent read ports and adapted to read a desired area from a first read port and an area which contains the first area and is wider than the first area from a second read port , and a memory write control unit . with this construction , an input video signal is written to the memory , starting with a write head address designated by the memory write control unit , the first and second fields to be read during the next field are determined during the period of vertical blanking , a next write head address is determined to be after the first area , and a signal of the first area is delivered as an output video signal .