Step 1 - Load and Crop Image

macroblock_size = 16;

%read image

v = VideoReader("E:\sem 7\image vvideo coding\project\video_trim.mp4");

frame1 = rgb2gray(readFrame(v));

%crop image to fit macroblocks

frame1 = imcrop(frame1,[0 0 macroblock_size*floor(size(frame1,2)/macroblock_size) macroblock_size*floor(size(frame1,1)/macroblock_size) ]);