Convert all FFmpeg supported media file to high quality AAC file (need libfdk_aac encoder)

ffaac.py

#!/usr/bin/env python2.7

from optparse import OptionParser
from subprocess import call
from os.path import splitext
import sys, os

def ffaac(filename, opts):
	cmd = ['ffmpeg', '-hide_banner', '-y', '-i', filename, 
				'-c:a', 'libfdk_aac']
	profile = {'lc':'aac_low', 'he':'aac_he', 'he2':'aac_he_v2', 
			'ld':'aac_ld', 'eld':'aac_eld'}
	if not opts.br and not opts.vbr:
		cmd.extend(['-b:a', '256k'])
	if opts.br:
		cmd.extend(['-b:a', str(opts.br)+'k'])
		if opts.br >= 256:
			cmd.extend(['-cutoff', '20000']) #20khz is the upper limit
		elif opts.br >= 192:
			cmd.extend(['-cutoff', '18000'])
	if opts.vbr:
		cmd.extend(['-vbr', opts.vbr])
	if opts.ar:
		cmd.extend(['-ar', opts.ar])
	if opts.ch:
		cmd.extend(['-ac', opts.ch])
	cmd.extend(['-profile:a', profile[opts.prof]])
	if opts.prof == 'eld' and opts.sbr:
		cmd.extend(['-eld_sbr', '1'])
	cmd.extend([
		'-write_id3v2', '1',
		'-write_id3v1', '1',
		'-id3v2_version', '3',
		'-f', 'adts'])

	if filename.lower().endswith('.aac'):
		return
	outfile = splitext(filename)[0] + '.aac'
	cmd.append(outfile)
	print cmd

	return call(cmd)

if __name__=='__main__':
	parser = OptionParser()
	parser.add_option('-b', metavar='NUM', type=int, dest='br')
	parser.add_option('-r', metavar='NUM', choices=['8000','11025','16000','22050','32000', '44100', '48000'], dest='ar', help='8000/11025/16000/22050/32000/44100/48000')
	parser.add_option('-c', metavar='NUM', choices=['1','2'],dest='ch', help='1/2')
	parser.add_option('-p', metavar='TYPE',choices=['lc', 'he', 'he2', 'ld', 'eld'], default='lc', dest='prof', help='lc/he/he2/ld/eld')
	parser.add_option('-v', metavar='QUAL', choices=['1', '2', '3', '4', '5'], dest='vbr', help='1/2/3/4/5')
	parser.add_option('-s', action='store_true', dest='sbr', help='SBR for ELD')
	parser.add_option('-d', action='store_true', dest='delete')
	opts,  args = parser.parse_args()
	for f in args:
		if ffaac(f, opts) == 0 and opts.delete :
			try:
				os.remove(f)
			except OSError:
				pass