Extracting & Saving of frames from a Video file through Matlab

clc;
close all;
clear all;

% assigning the name of sample avi file to a variable
filename = 'rhinos.avi';

%reading a video file
mov = MMREADER(filename);

% Defining Output folder as 'snaps'
opFolder = fullfile(cd, 'frames');
%if  not existing 
if ~exist(opFolder, 'dir')
%make directory & execute as indicated in opfolder variable
mkdir(opFolder);
end

%getting no of frames
numFrames = mov.NumberOfFrames;

%setting current status of number of frames written to zero
numFramesWritten = 0;

%for loop to traverse & process from frame '1' to 'last' frames 
for t = 1 : numFrames
currFrame = read(mov, t);    %reading individual frames
opBaseFileName = sprintf('%3.3d.png', t);
opFullFileName = fullfile(opFolder, opBaseFileName);
imwrite(currFrame, opFullFileName, 'png');   %saving as 'png' file
%indicating the current progress of the file/frame written
progIndication = sprintf('Wrote frame %4d of %d.', t, numFrames);
disp(progIndication);
numFramesWritten = numFramesWritten + 1;
end      %end of 'for' loop
progIndication = sprintf('Wrote %d frames to folder "%s"',numFramesWritten, opFolder);
disp(progIndication);
%End of the code