getting problem in coading while reading input video.

if true
  % code
end[filen,pathn]=uigetfile('*.avi','select the avifile','avi'); 
avi = aviread(filen);
frames = {avi.cdata};
a = mmreader([pathn,filen]);
vidFrames = read(a);
numFrames = get(a,'numberOfFrames');
figure;