Writing a plot into a video

Question

Yanjika O 2020-6-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/555979-writing-a-plot-into-a-video

回答： Image Analyst 2020-6-28

Hello all,

I have this code for generating plots with complete dark and green rectangular. I wanted to get the frames and save them into video. How do i do this?

clear all
clc
repeats=5;
x=[3 7 7 3];
y=[3 3 7 7];
plot(x,y);
set(gca,'color','k','XTick',[], 'YTick', [])
set(gcf, 'WindowState', 'maximized')
for k=1:repeats
        fill(x,y,'k')
        set(gca,'color','k')
        ax=gca;
        xlim([0 10]);
        ylim([0 10]);
        pause(5)
                fill(x,y,'g')
                set(gca,'color','k')
                ax=gca;
                xlim([0 10]);
                ylim([0 10]);
                pause(5)  
                F(k)=getframe(gcf);        
end
close all
writerObj=VideoWriter('safeGreen.avi','Uncompressed AVI');
writerObj.FrameRate=30;
open(writerObj);
writeVideo(writerObj,F);
close(writerObj);

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Walter Roberson 2020-6-28

在 MATLAB Online 中打开

I suspect that you want the frames you draw to last 5 seconds each upon display.

In order to do that at 30 fps, you would have to record 150 copies of the same frame.

Alternately, you can switch to 1/5 fps, like in the below code.

repeats=5;
x=[3 7 7 3];
y=[3 3 7 7];
plot(x,y);
set(gca,'color','k','XTick',[], 'YTick', [])
set(gcf, 'WindowState', 'maximized')
for k=1:2:repeats*2
    fill(x,y,'k')
    set(gca,'color','k')
    ax=gca;
    xlim([0 10]);
    ylim([0 10]);
    pause(1)
    F(k)=getframe(gcf);
    
    fill(x,y,'g')
    set(gca,'color','k')
    ax=gca;
    xlim([0 10]);
    ylim([0 10]);
    pause(1)
    F(k+1)=getframe(gcf);
end
close all
writerObj=VideoWriter('safeGreen.avi','Uncompressed AVI');
writerObj.FrameRate=1/5;
open(writerObj);
writeVideo(writerObj,F);
close(writerObj);