(App Designer) Refresh rate low displaying high-res video in GUI created by AppDesigner

Question

tbn 2018-2-10

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回答： tbn 2018-2-23

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Hello, I am having trouble with the following test-function:

Load a short high-res video and display it in a GUI that was created using App Designer. With the

drawnow()

commented out, the stream doesn't display. With the

drawnow(),

I get only ~1fps.

Is there any other solution than downsampling the displayed image-stream (fewer pixels)?

function test()
close all; 
% vidFullPath = 'traffic.mj2'; % low-res Matlab sample video: works
vidFullPath = 'sample.avi'; %1920x1080 video-snipped
vidSrc = vision.VideoFileReader(vidFullPath,'ImageColorSpace','RGB');
gui = test_GUI();
img = step(vidSrc);
imshow(img,'Parent',gui.UIAxes);
% drawnow();
while ~isempty(img)
    imshow(step(vidSrc),'Parent',gui.UIAxes);
%     drawnow();
end
end

Any help is greatly appreciated!

Thanks, tbn

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Answer 1

Prajith Chilummula 2018-2-23

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编辑：Prajith Chilummula 2018-2-23

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Hello, can you try using

drawnow limitrate;

to increase the animation rate. Refer this link for more information:

https://www.mathworks.com/help/matlab/ref/drawnow.html

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Answer 2

tbn 2018-2-23

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Thanks Raghu ram for your answer.

drawnow limitrate

does not solve it. In the meantime, I received some feedback from the MathWorks Support team which basically tells me that - at this stage - I'd have to code my own GUI or use GUIDE in order to play video inside a custom GUI. They did reach out to their development team to improve this behavior. So there's hope.

tbn