"File is corrupt or is not a standard MP3 file" error

??? Error using ==> mp3read>mysystem at 373

unable to execute mp3info -r m -p "%Q %u %b %r %v * %C %e %E %L %O %o %p" "output1.mp3" ( * output1.mp3 is corrupt or is not a standard MP3 file. )

Error in ==> mp3read at 188

w = mysystem(cmd);

i am using the mp3read function available at file exchange. My code works fine for all mp3 files but this error arises only when i use audio files in database that have separated from avi files by following code :

A=dir('*.avi')

for i=1:length(A)

filename=A(i).name

hmfr = signalblks.MultimediaFileReader...

        (filename,'AudioOutputDataType','double');

 hfirdec = dsp.FIRDecimator; % decimate by 2

hmfw = signalblks.MultimediaFileWriter...

        (strcat('output',num2str(i),'.mp3'),'SampleRate', 22050/2);

 while ~isDone(hmfr)

     audio = step(hmfr);

   audiod = step(hfirdec, audio);

   step(hmfw, audiod);

end

 release(hmfr);

 release(hmfw);

end

I am pretty sure it has something to do with it.