[Audio processing] FFMPEG转音频格式和采样率

import os
import string
import subprocess as sp

#Full path of ffmpeg
FFMPEG_BIN = "/Users/karl/Documents/python/audio/tool/ffmpeg"
#Full path of sourceDir
sourceDir = "/Users/karl/Documents/python/audio/"
#Full path of targetDir
targetDir = "/Users/karl/Documents/python/newdir/"
#Sample frequency
sf = 11025
#Extension setting
ext = ‘mp3‘

def convert(sourceDir, targetDir, sf, ext):
    if not sourceDir.endswith(‘/‘):
        sourceDir += ‘/‘
    if not targetDir.endswith(‘/‘):
        targetDir += ‘/‘
    if not os.path.exists(targetDir):
        os.mkdir(targetDir)
    files = os.listdir(sourceDir)
    for f in files:
        if f.endswith(‘wav‘):
            command = [ FFMPEG_BIN,
                   ‘-i‘, sourceDir + f,
                   ‘-ar‘, str(sf), targetDir + os.path.splitext(f)[0] + ‘.‘ + ext]
            print command
            pipe = sp.Popen(command, stdout = sp.PIPE, bufsize = 10**8)


convert(sourceDir, targetDir, sf, ext)