VideoReader and VideoWriter on Matlab not getting the same framerate

In the original video I get 11 seconds and in the new one 5 seconds. Anyone knows the problem?

outputVideo = VideoWriter('openv_v.avi');
open(outputVideo);

vid = VideoReader('openv.avi');

for idx = 1:vid.NumberOfFrames
    img = read(vid, idx);

       writeVideo(outputVideo,img);
  end

close(outputVideo);

Answer 1

[32sthide]

Solved with one line.

outputVideo.FrameRate = vid.FrameRate;