flac 和 wav音频格式转换

参考：https://stackoverflow.com/questions/23925494/how-to-convert-wav-to-flac-from-python

wav to flac:

import audiotools
filepath_wav = 'music.wav'
filepath_flac = filepath_wav.replace(".wav", ".flac")
audiotools.open(filepath_wav).convert(filepath_flac,
                                      audiotools.FlacAudio)

flac to wav:

import audiotools
filepath_flac = 'music.flac'
filepath_wav = filepath_flac.replace(".flac", ".wav")
audiotools.open(filepath_flac).convert(filepath_wav,
                                      audiotools.WaveAudio)