create a gif or video using this sequence of figures

I want to create a gif or video using this sequence of figures:

plot of figure 1
pause(0.8);
hold on;
plot of figure 2;
pause(0.8);
plot of figure 3;
pause(0.8);
plot of figure 4;
pause(0.8);
hold off

Is it possible ?

[Rik]

You will need to be able to export the contents of those figures, but if I recall correctly, the documentation example is fairly close to what you're asking. What did you try?

[Alberto Acri]

I was unable to use the examples in the documentation for my situation.

I had used this example:

https://it.mathworks.com/matlabcentral/answers/94495-how-can-i-create-animated-gif-images-in-matlab

[Rik]

The steps are still the same:

1. Create graphics
2. Capture as images
3. Write to file

What did you try exactly?

[Alberto Acri]

I tried this way but I don't get the gif.

% Capture the plot as an image 
      h=figure
      filename = 'testAnimated.gif';
      frame = getframe(h); 
      im = frame2im(frame); 
      [imind,cm] = rgb2ind(im,256); 
      % Write to the GIF File 
      n = 1:0.5:5
      if n == 1 
          imwrite(imind,cm,filename,'gif', 'Loopcount',inf); 
      else 
          imwrite(imind,cm,filename,'gif','WriteMode','append'); 
      end 

[Walter Roberson]

    n = 1:0.5:5

That is a vector of values

    if n == 1 

You are testing a vector of values. For the if to succeed, all of the tests need to be true simultaneously . The first element where n is 1 succeeds, but where n = 1.5, 2, 2.5, and so on all fail, so n == 1 is [true] followed by a bunch [false], and if needs them all to be true to work. So the if will not match. Only the else will happen.

The else branch will write one frame.

You do not have any looping.

Also, the colormap needs to be the same for all of the frames. That is not a requirement of GIF file format, but imwrite() is not able to write different colormaps for each frame, so imwrite() would silently rewrite your coloring. I at least made it obvious here. Now you just have the problem that the colormap derived from the first image might not be representative of the rest. You would probably be better off using a fixed colormap.

% Capture the plot as an image 
  h=figure
  filename = 'testAnimated.gif';
  for n = 1:0.5:5
      frame = getframe(h); 
      im = frame2im(frame); 
      % Write to the GIF File 
      if n == 1
          [imind,cm] = rgb2ind(im,256); 
          imwrite(imind, cm, filename, 'gif', 'Loopcount', inf); 
      else
          imind = rgb2ind(im, cm);
          imwrite(imind, cm, filename, 'gif', 'WriteMode', 'append'); 
      end 

[Alberto Acri]

but I want to create a video with the sequence of images above.

[Walter Roberson]

Your question asked to create a gif or a video, and the above shows creating a gif.

You can use VideoWriter; see for example https://www.mathworks.com/help/matlab/ref/videowriter.writevideo.html#bus2hel-1_sep_bus0tu7

Answer 1

[Gaurav Garg]

Hi,

Apart from all the resources provided in the comments above, the below links would surely help you -

1.) Link 1

2.) Link 2

The above 2 links contain similar questions answered by MATLAB users and accepted too.

[Alberto Acri]

I used link 1 shown below:

N=1   % set

for i = 1:N
    figure(1)  
%    imshow(processo(:,:,1,i))
plot of figure 1
pause(0.8);
hold on;
plot of figure 2;
pause(0.8);
plot of figure 3;
pause(0.8);
plot of figure 4;
pause(0.8);
hold off

      F(i) = getframe(gcf) ;
      drawnow
    end
  % create the video writer with 1 fps
  writerObj = VideoWriter('myVideo.avi');
  writerObj.FrameRate = 10;
  % set the seconds per image
% open the video writer
open(writerObj);
% write the frames to the video
for i=1:length(F)
    % convert the image to a frame
    frame = F(i) ;    
    writeVideo(writerObj, frame);
end
% close the writer object
close(writerObj);

but it creates me a video of 00.00.00 seconds. I set N=1

[Walter Roberson]

You need more than one frame for avi files. It is a limitation of the movie encoders.