import os

def main():
    dirname = "C:\\BevDoc\\Black_Eyed_Peas\\Monkey_Business"
    dl = os.listdir(dirname)
    for f in dl:
        if f.endswith(".mp3"):
            nfn = dirname + "\\" + f[0:-4] + ".aac"
            fn = dirname + "\\" + f
            params = ['-i', fn, '-acodec', 'libfaac', '-ab', '128k', '-ar', '44100', nfn]
            ffmpeg = "c:\\bin\\ffmpeg\\bin\\ffmpeg.exe"
            code = os.spawnv(os.P_WAIT, ffmpeg, params)
            print fn, os.stat(fn) 

if __name__ == "__main__":
    main()