Speeding up video creation

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KieranSQ 2019-5-21

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https://ww2.mathworks.cn/matlabcentral/answers/463309-speeding-up-video-creation

评论： KieranSQ 2019-5-21

I am trying to create a video in matlab from some data I have produced. I have data of size 5242x5000 double against nodes 5242x2. When I try to plot my movie the run time is into the hours which isn't practical and I do not understand programming enough to know where to go, any help will be appreciated.

Unfortunately I cannot attach my data.

tic
T=its(2)
M = struct('cdata', cell(1,T+1), 'colormap', cell(1,T+1)); %Pre allocates the structure
hold off
% hold on;
% Prepare the new file.
figure(5);
set(gcf,'units','normalized','outerposition',[0 0 1 1]);
file=char('NeumannCluster-dt'+ string(dt)+'DateTime'+string(datestr(now,'mm-dd-yyyy-HH-MM')));       
% vidObj = VideoWriter(file, 'MPEG-4');
vidObj = VideoWriter(file);
open(vidObj);
% %Replace with a While 
its=size(results_matrix)
for i=1:T
        i
        trimesh(connectivity_matrix, nodes(:,1),nodes(:,2),results_matrix(:,i));
        hold on 
        plot(boundarynodeGeometry(:,1),boundarynodeGeometry(:,2), 'b-'); %Plots stationary boundary points
        zlabel('Temperature');
        xlabel('X Position');
        ylabel('Y Position');
        colorbar;
        set(gcf, 'color', 'white');
        view(0,90) ;
        
        M(i)=getframe(gcf);
        writeVideo(vidObj,M(i));
end
% Close the file.
   close(vidObj);
   toc

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Geoff Hayes 2019-5-21

I'm not too clear on the statement 5242x5000 double against nodes 5242x2. Could you clarify please? Also, what is T? (I'm guessing 5000?)

KieranSQ 2019-5-21

Hello,

Apologies, I was hoping to upload the data. So my data (z position/colour) is a matrix of size 5242x5000 (rows,columns) and nodes is the x,y positions of a vector.

T is 5000, the number of iterations i took to produce my data - this variable can be changed slightly without impacting the data. I mostly want to produce a video for qualitative purposes.

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