How do I make an animated GIF file from an AVI file?

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

Answer 1

[MathWorks Support Team]

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