VideoWriter is only showing the last figure as opposed to full 135 image movie

Question

james Brown 2018-7-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/411886-videowriter-is-only-showing-the-last-figure-as-opposed-to-full-135-image-movie

评论： james Brown 2018-7-24

Here is my code:

myFolder = 'C:\Users\Authorised User\Documents\MATLAB\OilDropForceImages\OilDropForceImagesResized'; if ~isdir(myFolder) errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder); uiwait(warndlg(errorMessage)); return; end

filePattern = fullfile(myFolder, '*.png');

pngFiles = dir(filePattern);

for k = 1:length(pngFiles)

baseFileName = pngFiles(k).name;
fullFileName = fullfile(myFolder, baseFileName);
fprintf(1, 'Now reading %s\n', fullFileName);
imageArray = imread(fullFileName);
imshow(imageArray, 'InitialMagnification', 77); 
% Display image.
drawnow; % Force display to update immediately.

end

A = imageArray;

hold on

vid0bj = VideoWriter('OilDropForceMovie','MPEG-4');

open(vid0bj);

writeVideo(vid0bj,A)

hold off

close(vid0bj)

This code plots in MATLAB the full video I want to see which lasts roughly 20 seconds but when I convert it to windows media player it is only showing the final image. What am i doing wrong?

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Answer 1

Giridharan Kumaravelu 2018-7-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/411886-videowriter-is-only-showing-the-last-figure-as-opposed-to-full-135-image-movie#answer_330112

You are writing the video outside of the loop, that is why you are seeing only the last image. Move the writeVideo command inside the loop, you will find the full plot video getting saved.

Hope this helps!

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james Brown 2018-7-24

Thanks that makes a lot of sense. haha problem now is that permission is being denied to create the mp4 file but I'll try and sort this problem myself

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