How to generate video file from animated plot in Matlab?

Question

Alireza Babaei 2021-1-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/714463-how-to-generate-video-file-from-animated-plot-in-matlab

评论： Alireza Babaei 2022-10-16

Dear scholars,

I have a problem with generating .avi video file from animated file. I attach the code below, I appreciate if sb can give me a hand in figuring out the problem.

It generates the vidoe but the video is quite short and practically does NOT show anything!

Regards

x = linspace(0, 1*pi, 5000)
y = exp(-0.05.*100.*x).*sin(100.*x+0);
curve = animatedline('Color', 'k', 'LineStyle', '-', 'LineWidth', 2)
set(gca, 'XLim', [0 1*pi]);
box on 
 for i = 1 : length(x)
     addpoints(curve, x(i), y(i));
     drawnow
 end 
 legend('Classical Rod Model', 'FontSize', 12)
 xlabel('t (s)', 'FontSize', 12)
 ylabel('Amplitude', 'FontSize', 12)
obj = VideoWriter('curve.avi');
obj.Quality = 100;
obj.FrameRate = 3; 
open(obj);
f = getframe(gcf)
writeVideo(obj, f)
obj.close();

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Answer 1

KSSV 2021-1-12

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/714463-how-to-generate-video-file-from-animated-plot-in-matlab#answer_595778

It is because, you are writitng only the last frame into video...you need to keep the video writer code into a loop.

x = linspace(0, 1*pi, 1000) ;
y = exp(-0.05.*100.*x).*sin(100.*x+0);
curve = animatedline('Color', 'k', 'LineStyle', '-', 'LineWidth', 2) ;
set(gca, 'XLim', [0 1*pi]);
box on
f = cell(length(x),1) ; 
for i = 1 : length(x)
    addpoints(curve, x(i), y(i));
    drawnow
    f{i} = getframe(gcf) ;
end
legend('Classical Rod Model', 'FontSize', 12)
xlabel('t (s)', 'FontSize', 12)
ylabel('Amplitude', 'FontSize', 12)
obj = VideoWriter('curve.avi');
obj.Quality = 100;
obj.FrameRate = 3;
open(obj);
for i = 1:length(x)
    writeVideo(obj, f{i}) ;
end
obj.close();