problem with videoWriter not closing

Hi folks,

I am creating a video and having trouble with the videoWriter not closing, or taking a very long time to close.

May I please ask how to fix this? The code is as follows:

    writerObj = VideoWriter(mainVideoName);
    writerObj.FrameRate = 10;
    open(writerObj);
    
    for j = 1 : numMainImages

        mainImg = imread([imageMainFolder imageMainFiles(j).name]);
        mainImg = mainImg(:,:,1:3);
        cropImg = imread([cropsFolder cropFiles(j).name]);
        threshImg = im2uint8(imread([threshFolder threshFiles(j).name]));
        h = figure;
        h(1) = subplot(2, 2, 1);
        image(cropImg, "Parent", h(1));
        h(2) = subplot(2, 2, 2);
        image(threshImg, "Parent", h(2));
        h(3) = subplot(2, 2, 3:4);
        image(mainImg, "Parent",  h(3));
        myText = ['Temperature = ', num2str(myTemp(j)), '^{o}C'];
        annotation('textbox', [0.4, 0.55, 0,0], 'string', myText, "FitBoxToText","on");
        h(2).Colormap = gray(256);
    
    for k = 1:3
        h(k).XAxis.Visible = "off";
        h(k).YAxis.Visible = 'off';
    end
    
        thisFrame = getframe(gca);
        writeVideo(writerObj, thisFrame);      
    end
close(writerObj);

[Benjamin Thompson]

How big is numMainImages? Can you post some sample images?

[Teshan Rezel]

@Benjamin Thompson Hi there, numMainImages is typically between 1000-1500. So essentially, since I'm taking 3 images and colating them into one figure, that number is tripled.

[Image Analyst]

Does it actually GET to the close() statement? Maybe wrap it in tic and toc to see how many seconds it actually takes.

tic;
close(writerObj);
toc

[Jan]

@Teshan Rezel: Do not remove this question. Simply ask your new question and insert a link to this thread to avoid confusions. You can add a linl to the new question here also. Then everything is fine.

[Teshan Rezel]

hi @Image Analyst, thanks for the response! It appears it doesn't actually get to the close(writeObj) statement as I left the programme running over 2 days and had no video files written.

I'm not sure why this is!

Answer 1

[yanqi liu]

yes，sir，may be use image replace frame to test，such as

writerObj = VideoWriter(mainVideoName);
writerObj.FrameRate = 10;
open(writerObj);

for j = 1 : numMainImages
    
    mainImg = imread([imageMainFolder imageMainFiles(j).name]);
    mainImg = mainImg(:,:,1:3);
    cropImg = imread([cropsFolder cropFiles(j).name]);
    threshImg = im2uint8(imread([threshFolder threshFiles(j).name]));
    h = figure;
    h(1) = subplot(2, 2, 1);
    image(cropImg, "Parent", h(1));
    h(2) = subplot(2, 2, 2);
    image(threshImg, "Parent", h(2));
    h(3) = subplot(2, 2, 3:4);
    image(mainImg, "Parent",  h(3));
    myText = ['Temperature = ', num2str(myTemp(j)), '^{o}C'];
    annotation('textbox', [0.4, 0.55, 0,0], 'string', myText, "FitBoxToText","on");
    h(2).Colormap = gray(256);
    
    for k = 1:3
        h(k).XAxis.Visible = "off";
        h(k).YAxis.Visible = 'off';
    end
    
    thisFrame = frame2im(getframe(gca));
    writeVideo(writerObj, thisFrame);
end
close(writerObj);

[Teshan Rezel]

@yanqi liu hi, thank you for this but it doesn't seem to solve the issue just yet!

[Rik]

I haven't read the rest of the thread, but can you explain what is different between what you need and what this suggestion does? Yanqi might be able to help you if you make it clear what should be different.

In general users with sufficient reputation points to delete posts, are not fans of doing that for legitimate content.