Program error!! Why??

//Code below

obj = VideoReader('C:\Users\Robotics\Pictures\Saved Pictures\Lightfile\Prelight.MOV');
frameidx = 0;
groupidx = 0;
frames_per_group = 5;
frame_history = [];
frameidx_history = [];
groupidx_history = [];
while hasFrame(obj)
    frameidx = frameidx + 1;
    groupidx = groupidx + 1;
    b = readFrame(obj);
    frame_history = cat(4, frame_history, b);
    frameidx_history(end+1) = frameidx;
    if size(frame_history, 4) == frames_per_group
      maxbrightness = -inf;
      maxbrightnessidx = -inf;
      for K = 1 : frames_per_group;
        grayframe = rgb2gray(frame_history(:,:,:,K));
        thisbrightness = sum(grayframe(:));
        if thisbrightness > maxbrightness
          maxbrightness = thisbrightness;
          maxbrightnessidx = K;
        end
      end
      bestframe = frame_history(:,:,:,maxbri ghtnessidx);
      bestframeidx = frameidx_history(maxbrigthnessidx);
      filename = sprintf('frame%04d.jpg', bestframeidx);
      imwrite(bestframe, filename);
      frame_history = [];
      frameidx_history = [];
    end
end

when I run it, it says that its a problem with the maxbrightnessidx. Can someone help? Please

Answer 1

[Rik]

Without the file, the only thing I see, is that you have an extra space in your line:

bestframe = frame_history(:,:,:,maxbri ghtnessidx);

Answer 2

[Roger Stafford]

In

   bestframeidx = frameidx_history(maxbrigthnessidx);

you misspell 'maxbrigthnessidx'. The 't' and 'h' are interchanged.