Building a wav file from a video

audio win(nb)image(id)dim(s25);

       Allows build an image id size d with property audio win image. When an image id0 changes, image(id0,id)win(x1,y1,x2,y2)dim(d); copy window (x1,y1,x2,y2) of image id0 into image id, exec audio image(id); changes this property at this time. After s25 images write audio image(id) audio(ia)name("nnn.wav") rem(-1)average; writes the resulting file nnn.wav.