how to fix Index exceeds matrix dimensions in Matlab?

Here is my code

%Input a Video file
obj=VideoReader('Poem2.avi');
A=read(obj);
j=1;
%Preallocate the frame structure
Frame=struct('cdata',1,'colormap',cell([1 100]));

%Create a cell array with the Poem versus
Txt={'TWO roads diverged in a yellow wood,';
'And sorry I could not travel both';
'And be one traveler, long I stood';
'And looked down one as far as I could';   
'To where it bent in the undergrowth;';
'Then took the other, as just as fair,';   
'And having perhaps the better claim,';
'Because it was grassy and wanted wear;';  
'Though as for that the passing there';
'Had worn them really about the same,';
'And both that morning equally lay';   
'In leaves no step had trodden black.';
'Oh, I kept the first for another day!';   
'Yet knowing how way leads on to way,';
'I doubted if I should ever come back.';
'I shall be telling this with a sigh'; 
'Somewhere ages and ages hence:';  
'Two roads diverged in a wood, and I—';
'I took the one less traveled by,';
'And that has made all the difference.';};

%display the image
%Add the poem lines
%Grab the frame
%There are 20 lines totally
%Add 3 and 2 lines alternatively in each frame

      inc=0;
  for i=1:size(A,4)%size(A,1) is the number of rows of A and size(A,2) is the number of columns of A.

      n=mod(i,2);  
      I=A(:,:,:,i);

      imshow(I), hold on
  for k=1:2+n
      text(60,330+(k*30),Txt{k+inc},'Color','w','FontWeight','Bold','FontSize',15);

end
    inc=inc+1+n;
    Frame(j:j+9)=getframe;
    j=j+10;

end

obj=VideoWriter('Road Not Taken.avi');
obj.FrameRate = 10;
open(obj); 
writeVideo(obj,Frame);
close(obj);

When i run it, there is an error

Index exceeds matrix dimensions.

    Error in SubVideo (line 46)
        text(60,330+(k*30),Txt{k+inc},'Color','w','FontWeight','Bold','FontSize',15);

Please help me fix this error

[KSSV]

Can you tell us what is size of A?

[huy nguyen]

i am a newbie and i use codes from "https://angeljohnsy.blogspot.com/2012/03/how-to-add-captionsubtitles-to-video-in.html"

[huy nguyen]

this is info of video info =

          Duration: 3.2280
              Name: 'Poem2.avi'
              Path: 'C:\Users\Nguye...'
               Tag: ''
              Type: 'VideoReader'
          UserData: []
      BitsPerPixel: 24
         FrameRate: 6.0000
            Height: 480
    NumberOfFrames: 18
       VideoFormat: 'RGB24'
             Width: 640

Answer 1

[KSSV]

Error is due to: size of your Txt is 20X1....and in the loop you are trying to access Txt{21}.....you need to add more Txt....or access it till 20.

[huy nguyen]

Could you tell me specifically? This is my first time i use Matlab