MATLAB: Make 2 videos side by side

MATLABvideo on matlab

i have the following code to make 2 videos side by side.
v1 = VideoReader('XXXXXXX.avi')
v2 = VideoReader('XXXXXXX.avi')
i1 = 0;
i2 = 0;
while i1 < v1.NumberOfFrames && i2 < v2.NumberOfFrames
      if i1 < v1.NumberOfFrames
          i1 = i1+1;
          subplot(2,2,1)
          image(v1.read(i1))
      end
      if i2 < v2.NumberOfFrames
          i2 = i2+1;
          subplot(2,2,2)
          image(v2.read(i2))
      end
  drawnow
  end
but a figure will keep popping out whenever i try to close the window. the window will only close until the video ends. how to fix that? i will also get an error saying :
Error using VideoReader/read (line 160)
The frame index requested is beyond the end of the file.
how to fix both things? please help.

Best Answer

v1 = VideoReader('XXXXXXX.avi')
v2 = VideoReader('XXXXXXX.avi')
i1 = 0;
i2 = 0;
fig = gcf;
ax1 = subplot(2,2,1, 'Parent', fig);
ax2 = subplot(2,2,2, 'Parent', fig);
while i1 < v1.NumberOfFrames && i2 < v2.NumberOfFrames
        if i1 < v1.NumberOfFrames
            i1 = i1+1;
            if ishandle(ax1)
              image(ax1, v1.read(i1));
            else
              break;    %axes is gone, figure is probably gone too

           end
        end
        if i2 < v2.NumberOfFrames
            i2 = i2+1;
            if ishandle(ax2)
              image(ax2, v2.read(i2));
            else
              break;    %axes is gone, figure is probably gone too
            end
        end
    drawnow
    end
Note: in R2014b or later, it would be better to use isgraphics() instead of ishandle()
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