Convert audio file format using ffmpeg in ubuntu

audio_format_convert.py

''' convert file format using ffmpeg in ubuntu
 windows install: https://video.stackexchange.com/questions/20495/how-do-i-set-up-and-use-ffmpeg-in-windows 
 or https://www.wikihow.com/Install-FFmpeg-on-Windows

 Usage:
 $ python ./format_convert.py --input <dir/path> --output <dir/path>
'''
import os
import argparse

arg = argparse.ArgumentParser()
arg.add_argument("--input",default='./tf')
arg.add_argument("--output",default="./wav_dataset")
opt = arg.parse_args()

INPUT_FORMAT = ('aac','mp4','m4a','ogg','mp3','opus')
OUTPUT_FORMAT = 'wav'
PATH = opt.input+'/'
SAMPLE_RATE = 16000
OUT_DIR = opt.output


if not os.path.isdir(OUT_DIR):
	os.mkdir(OUT_DIR)

dirs = os.listdir(PATH)
dirs.sort()
print(dirs)
for folder in dirs:
	c=0
	if not os.path.isdir(OUT_DIR+'/'+folder):
		os.mkdir(OUT_DIR+'/'+folder)
	for filename in os.listdir(PATH+folder):
		if filename.endswith(INPUT_FORMAT):
			c+=1
			output = OUT_DIR+'/'+folder+'/'+filename.split('.')[0]+".wav"
			if not os.path.exists(output):
				print(output)
				os.system("ffmpeg -i '{0}' -ar {1} '{4}/{2}.{3}' -y".format(PATH+folder+'/'+filename, SAMPLE_RATE, filename.split('.')[0], OUTPUT_FORMAT, OUT_DIR+'/'+folder))