Looping VideoReader in Matlab for processing - matlab

Question

I've looked everywhere and I still cannot seem to successfully loop MATLAB's videoreader. I am trying to use MATLAB to process videos and convert them to saved image sequences which I can analyze by binary pixel properties for areas and such. I'm really new to MATLAB so any help would most certainly help.
Here is my code thus far for the image sequence creation. Also this is in R2015a.
function VideoToImageSequence(dirname,doall)
% load up the set of global variables
global settings
inpath = [settings.inpath, '\' , settings.dirname, '\'];
outpath = inpath;
%list of files
list = dir([inpath, '\*.avi']);
N =length(list);
display(['Found ', mat2str(N), ' movies in ', inpath]);
%Main converter
for i= 1:N
rootname{i} = list(i).name(1:end-4);
savefile = [rootname{i}, '.mat'];
if exist([inpath, savefile], 'file') && doall==0
display(['Found analyzed file ', savefile, ' .... skipping']);
else
%Directory
addpath(genpath([settings.inpath,'\', settings.dirname,'\' ,rootname{i}]));
workingDir = [settings.inpath,'\' , settings.dirname, '\' , rootname(i)];
cd([settings.inpath, '\', settings.dirname, '\'])
filename= rootname(i) ;
VideoFile = VideoReader(filename) ;
ii = 1;
%Spits out image sequence
while hasFrame(VideoFile(i))
img = readFrame(VideoFile(i));
filename = [sprintf('%03d',ii) '.jpg'];
fullname = fullfile(workingDir,'images',filename);
imwrite(img,fullname) % Write out to a JPEG file (img1.jpg, img2.jpg, etc.)
ii = ii+1;
end
end
end
Any help you can give would be awesome! Thanks.