Error using VideoWriter/writeVideo (line 344) Frame must be 434 by 343

Question

saravanakumar D 2017-2-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/327160-error-using-videowriter-writevideo-line-344-frame-must-be-434-by-343

回答： venus 2019-7-22

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

I getting error: Error using VideoWriter/writeVideo (line 344) Frame must be 434 by 343

Error in movie_trial5 (line 22) writeVideo(v,getframe(gca))

Here is my code:

nframes=50;
Frames=moviein(nframes);
x1=linspace(0,L,1000);
x2=linspace(L,2*L,1000);
figure
v = VideoWriter('E:\newfile.avi');
open(v)
for t=1:nframes
  y1=sin(x1)*cos(20*t);
  y2=sin(2*L-x2)*cos(20*t);
  plot (x1,y1,x2,y2,'Linewidth',3)
  writeVideo(v,getframe(gca))
end
close(gca)
close(v)

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Geoff Hayes 2017-2-27

在 MATLAB Online 中打开

Perhaps the frame size is changing on an iteration of your for loop which leads to the error. Try doing

 for t=1:nframes
   y1=sin(x1)*cos(20*t);
   y2=sin(2*L-x2)*cos(20*t);
   myFrame = getframe(gca);
   size(myFrame.cdata)
   writeVideo(v,myFrame)
 end

Does the size of the frame ever change?

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Answer 1

Walter Roberson 2017-2-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/327160-error-using-videowriter-writevideo-line-344-frame-must-be-434-by-343#answer_256524

在 MATLAB Online 中打开

nframes=50;
Frames=moviein(nframes);
x1=linspace(0,L,1000);
x2=linspace(L,2*L,1000);
figure
v = VideoWriter('E:\newfile.avi');
open(v)
ax = gca();
for t=1:nframes
  y1=sin(x1)*cos(20*t);
  y2=sin(2*L-x2)*cos(20*t);
    if t == 1
      h = plot(ax, x1, y1, x2, y2, 'Linewidth',3);
      set(ax, 'XLimMode', 'manual', 'YLimMode', 'manual');
    else
      set(h(1), 'YData', y1);
      set(h(2), 'YData', y2);
    end
    drawnow();
    writeVideo(v,getframe(ax))
  end
  close(gca)
  close(v)

Besides being more efficient, this avoids the chance that the frame will change size.

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Answer 2

venus 2019-7-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/327160-error-using-videowriter-writevideo-line-344-frame-must-be-434-by-343#answer_384181

在 MATLAB Online 中打开

A simple solution is to keep the first figure with its size (with using hold on) and plot all the data in it.

nframes=50;
Frames=moviein(nframes);
x1=linspace(0,L,1000);
x2=linspace(L,2*L,1000);
myfig = figure();
hold on
v = VideoWriter('E:\newfile.avi');
open(v)
for t=1:nframes
  y1=sin(x1)*cos(20*t);
  y2=sin(2*L-x2)*cos(20*t);
  plot (x1,y1,x2,y2,'Linewidth',3)
  writeVideo(v,getframe(gca))
  clf(myfig);
end
close(gca)
close(v)