Extract Video Frame (non-avi) in Matlab

The original author for this code can send me an email so that I can credit back to him/her.
Work for both avi and non-avi file

clc;

close all;

%% USE THIS IF - open a non-avi file

mov = mmreader('n3.mp4')

frame = read(mov,200); %LONG WAIT

mov.NumberOfFrames;

%% or USE THIS IF - Open an avi file

%filename = 'n3.wmv';

%mov = mmreader(filename);

%% continue here

% Output folder

outputFolder = fullfile(cd, 'frames');

if ~exist(outputFolder, 'dir')

mkdir(outputFolder);

end

%getting no of frames

numberOfFrames = mov.NumberOfFrames;

numberOfFramesWritten = 0;

for frame = 1 : numberOfFrames

thisFrame = read(mov, frame);

outputBaseFileName = sprintf('%3.3d.png', frame);

outputFullFileName = fullfile(outputFolder, outputBaseFileName);

imwrite(thisFrame, outputFullFileName, 'png');

progressIndication = sprintf('Wrote frame %4d of %d.', frame,numberOfFrames);

disp(progressIndication);

numberOfFramesWritten = numberOfFramesWritten + 1;

end

progressIndication = sprintf('Wrote %d frames to folder "%s"',numberOfFramesWritten, outputFolder);

disp(progressIndication);