MATLAB: How to make an animated GIF file from an AVI file

MATLAB

I would like to use MMREADER and IMWRITE to create an animated GIF file from an AVI file.

Best Answer

In order to convert code from an AVI file to an animated GIF file, follow the steps below. The AVI file is the input and named 'mode15_600p78Hz.avi' and the output file is the GIF file 'test1.gif.'

vrinfo = aviinfo('mode15_600p78Hz.avi');
filename = 'test1.gif'; 
mov1 = mmreader('mode15_600p78Hz.avi');
vidFrames = read(mov1);
for n = 1:vrinfo.NumFrames
      [imind,cm] = rgb2ind(vidFrames(:,:,:,n),255);
      if n == 1;
          imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
      else
          imwrite(imind,cm,filename,'gif','WriteMode','append');
      end
end

Related Solutions

MATLAB: How to create animated GIF images in MATLAB

Use the 'imwrite' function to create an animated GIF. An animated GIF contains a series of images all combined into one file. For this example,

1. Draw a series of plots for the function y = x^n for different values of n

2. Capture them as images

3. Write them into a GIF file

h = figure;
axis tight manual % this ensures that getframe() returns a consistent size
filename = 'testAnimated.gif';
for n = 1:0.5:5
    % Draw plot for y = x.^n
    x = 0:0.01:1;
    y = x.^n;
    plot(x,y) 
    drawnow 
      % Capture the plot as an image 
      frame = getframe(h); 
      im = frame2im(frame); 
      [imind,cm] = rgb2ind(im,256); 
      % Write to the GIF File 
      if n == 1 
          imwrite(imind,cm,filename,'gif', 'Loopcount',inf); 
      else 
          imwrite(imind,cm,filename,'gif','WriteMode','append'); 
      end 
  end

For a more detailed description on creating an animated GIF File, see the example “Write Animated GIF” on the 'imwrite' function reference page:

http://www.mathworks.com/help/matlab/ref/imwrite.html#btv452g-1

MATLAB: How to have an animated bar graph

h = figure;
axis tight manual % this ensures that getframe() returns a consistent size
filename = 'test.gif';
for n = 1:0.5:5
    % Draw plot for y = x.^n
    x = rand(10,1) ;
    bar(x)
    drawnow
    % Capture the plot as an image
    frame = getframe(h);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);
    % Write to the GIF File
    if n == 1
        imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
    else
        imwrite(imind,cm,filename,'gif','WriteMode','append');
    end
end

Best Answer

Related Solutions

MATLAB: How to create animated GIF images in MATLAB

MATLAB: How to have an animated bar graph

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