读取视频帧

fileName = 'e:\app.avi';
obj = VideoReader(fileName);
numFrames = obj.NumberOfFrames;% 读取视频的帧数

for i = 1 : numFrames
     frame = read(obj,i);% 读取每一帧
     imshow(frame);%显示每一帧
     imwrite(frame,strcat(num2str(i),'.jpg'),'jpg');% 保存每一帧
end