MATLAB: Matlab reads video frame slowly

imshowvideoreader

I try to read frames from video using the following code.
The original video play so fast, but when I try to read using Matlab, it plays so slow.
Is there any problem with Matlab? (I attached video with this question)
vidObj = VideoReader('unimore.avi');
for i=1:vidObj.NumberOfFrames
    v = read(vidObj,i);
    imshow(v)
end
Please kindly help, thanks.

Best Answer

Each imshow is expensive. It is more efficient to use imshow once, record the handle it returns, and update the CData property of the handle at each step. Or use one of the video player to update, such as vision.videoPlayer
https://www.mathworks.com/help/vision/ref/vision.videoplayer-class.html
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