Audio File Encoder

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import time
import subprocess
from datetime import datetime, timedelta


path = '/opt/data/'
rem_date = datetime.now() - timedelta(days=1)

for subdir, dirs, files in os.walk(path):
    files.sort()
    for file in files :
        filetime = datetime.fromtimestamp(os.path.getctime(subdir + '/' + file))
        if filetime > rem_date and ( str(file).endswith('.wav') or str(file).endswith('.ogg')):
            file_name = os.path.splitext(file)[0]

            if str(file).endswith('.ogg') :
                outfile_name_audio = subdir + '/' + file_name
            else:
                outfile_name_audio = subdir + '/' + file_name + ".mp3"

            fullpath = subdir + '/' + file
            print "#####################"
            print "Start Time: " + datetime.now().strftime("%Y-%m-%d %H:%M")
            print "Original File : " + file
            print "New File : " +file_name
            cmd_audio = 'ffmpeg -i %s -ab 64k -y %s' % (fullpath, outfile_name_audio)
            subprocess.call([cmd_audio, "-y"], shell=True)
            print "Removing file: " + file
            os.remove(fullpath)

            print "Stop Time: " + datetime.now().strftime("%Y-%m-%d %H:%M")