Frame must be 1464 by 834 but why ?

Question

muhammad choudhry 2021-4-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/808965-frame-must-be-1464-by-834-but-why

评论： Walter Roberson 2021-4-26

Hi,

I am making a video from the images but I am getting error which I do not know how to deal with. Can anyone help please.

Code:

imgFiles = dir('*.jpg') ; 
N = length(imgFiles) ; 
% create the video writer with 1 fps
writerObj = VideoWriter('myVideo.avi');
%writerObj.FrameRate = 10;
% open the video writer
open(writerObj);
% write the frames to the video
for i=1:N
    img = imgFiles(i).name ; 
    I = imread(img) ; 
    imshow(I) ; 
    F = getframe(gcf) ;
    writeVideo(writerObj, F);
end
% close the writer object
close(writerObj);

Error:

Error using VideoWriter/writeVideo (line 368)

Frame must be 1464 by 834

Error in framesTovideo (line 21)

writeVideo(writerObj, F);

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Answer 1

Mohammad Sami 2021-4-26

1
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https://ww2.mathworks.cn/matlabcentral/answers/808965-frame-must-be-1464-by-834-but-why#answer_684765

在 MATLAB Online 中打开

In that case perhaps you can try writing the image directly to the video, instead of using getFrame with imshow.

imgFiles = dir('*.jpg') ; 
N = length(imgFiles) ; 
% create the video writer with 1 fps
writerObj = VideoWriter('myVideo.avi');
%writerObj.FrameRate = 10;
% open the video writer
open(writerObj);
% write the frames to the video
for i=1:N
    img = imgFiles(i).name ; 
    I = imread(img) ; 
    writeVideo(writerObj, I);
end
% close the writer object
close(writerObj);

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Walter Roberson 2021-4-26

Yes, exactly. When you getframe(), you will not always read back exactly the same size frame, even if you are plotting the same amount of data. The frame size can vary between 2 pixels narrower than normal to 3 pixels wider than normal, based upon the absolute value of the data coordinates being used -- and this can be related to the exact width of the last text label on the axes (proportional width fonts.)

Writing directly from matrix to file is better in situations where it is practical.

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