Convert audio to mp3 and cut silence at the end

audiocut.py

import os
import shutil
from glob import glob
import subprocess

output_path = 'mp3'
mp3_quality = '320k'

if os.path.exists(output_path):
    shutil.rmtree(output_path)

os.makedirs(output_path)

input_files = list(glob('*.wav')) + list(glob('*.wma'))

for i, f in enumerate(input_files):
    print f, i + 1, len(input_files)

    last_silence_start = None

    for line in subprocess.check_output('ffmpeg -i "%s" -af silencedetect=n=-20dB:d=1 -f null -' % f, shell=True, stderr=subprocess.STDOUT).splitlines():
        if ' silence_start: ' in line:
            last_silence_start = line.split(' silence_start: ')[1]

    mp3_path = os.path.join(output_path, '.'.join(f.split('.')[:-1]) + '.mp3')

    try:
        if last_silence_start is None:
            print 'No silence found'
            subprocess.check_output('ffmpeg -i "%s" -b:a %s "%s"' % (f, mp3_quality, mp3_path), shell=True, stderr=subprocess.STDOUT)
        else:
            print 'Found silence after %s' % last_silence_start
            subprocess.check_output('ffmpeg -i "%s" -t %s -b:a %s "%s"' % (f, last_silence_start, mp3_quality, mp3_path), shell=True, stderr=subprocess.STDOUT)
    except subprocess.CalledProcessError as e:
        print e.output