python + ffmepg 批量转换目录wma文件为MP3文件

# change *.wma files to *.mp3 at current folder
import os
import subprocess
 
def wma2mp3(wma_path,mp3_path=None):
    path, name = os.path.split(wma_path)
    if name.split('.')[-1]!='wma':
        print 'not a wma file'
        return 0
    if mp3_path is None or mp3_path.split('.')[-1]!='mp3':
        mp3_path = os.path.join(path, name.split('.')[0] +'.mp3')
    error = subprocess.call(['ffmpeg','-i',wma_path,mp3_path])
    print wma_path,' was changed to .MP3',
    if error:
        return 0
        print 'NOT sucess'
    print 'success'
    #return mp3_path
 
if __name__ == '__main__':
    for d,sd,files in os.walk('.'):
        for f in files:
            wma_path = os.path.join(d,f)
            (prefix,sep,suffix)=wma_path.rpartition('.')
            if suffix !='wma':
                continue
            mp3_path = prefix+'.mp3'
            wma2mp3(wma_path)