Create a .avi through VideoWriter

Question

Richard Wood 2020-2-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/507206-create-a-avi-through-videowriter

评论： Richard Wood 2020-2-25

Hello everyone,

I am trying to replicate the approach given in this example: https://es.mathworks.com/matlabcentral/answers/78345-make-a-smooth-animation

I want, as him, to not to show each frame in iteration of a loop, and get directly the .avi video. I have tried to addapt directly the code for my case, but it seems that avifile function does not work in my MatLab version (the last one). So I have seen that the role of avifile has been replaced by VideoWriter. The problem is... which function plays the role of addframe in the VideoWriter environment? I let you here my example of the code adapted directly from the aforementioned post

physical_time_inelastic=[0:1:30];
spatial_grid=[0:1:100];
data_set_inelastic=rand([length(spatial_grid),4,length(physical_time_inelastic)]);
avi_mx_inelastic=VideoWriter('mx_Magnetization_Component_Evolution_Inelastic.avi');
u9=figure('visible','off');
for i=1:length(physical_time_inelastic)
    plot(spatial_grid.*(10^6),data_set_inelastic(:,2,i),'-b','LineWidth',2)
    xlabel('Track position, $x \, \, \left( \mu\mathrm{m} \right)$','FontSize',14,'interpreter','latex')
    ylabel('$x$-{\it th} magnetization components, $m_x$','FontSize',14,'interpreter','latex')
    t9=title(['Inelastic collision, $t=$',num2str(physical_time_inelastic(i).*(10^(12))),' ps'],'FontSize',14,'interpreter','latex')
    set(t9,'interpreter','latex','FontSize',12)
    set(u9,'Units','Inches');
    posu9=get(u9,'Position');
    set(u9,'PaperPositionMode','Auto','PaperUnits','Inches','PaperSize',[posu9(3),posu9(4)])
    avi_mx_inelastic=addframe(avi_mx_inelastic,u9);
end
avi_mx_inelastic=close(avi_mx_inelastic)
implay('mx_Magnetization_Component_Evolution_Inelastic.avi')

Also I would want to display in the title of each frame which is the value of physical_time_inelastic variable. It works as it is, but I would prefer the number to be in scientific notation. Any suggestion?

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darova 2020-2-24

I can't run your code without data

Richard Wood 2020-2-25

See above that I have created the necessary matrices with random values, just to be used as an example.

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Answer 1

Delprat Sebastien 2020-2-25

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/507206-create-a-avi-through-videowriter#answer_417228

Well everything is in the doc and that's very easy. It is writeVideo.

Z = peaks; surf(Z); axis tight manual set(gca,'nextplot','replacechildren'); v = VideoWriter('peaks.avi'); open(v); for k = 1:20 surf(sin(2*pi*k/20)*Z,Z) frame = getframe(gcf); writeVideo(v,frame); end close(v);