my python mp4 convert stripts(for psp)

It's easy but useful.
Convert .rmvb and avi file to mp4 file.

#!/usr/bin/env python
#coding=utf-8
import os,sys

'''
psp转换脚本
2007-12-31
qinchuan
'''
_filelist = []

def quote(name):
    name = name.replace(" ","\ ")
    name = name.replace("[","\[")
    name = name.replace("(","\(")
    name = name.replace("]","\]")
    name = name.replace(")","\)")
    return name

def getFile(path):
    global _filelist
    for item in os.listdir(path):
        if os.path.isdir(os.path.join(path,item)):
            getFile(os.path.join(path,item))
        elif os.path.isfile(os.path.join(path,item)):
            t = item.split(".")[-1].lower()
            if t == "rmvb" or t =="rm" or t =="avi" or t =="mpg":
                path = quote(path)
                item = quote(item)
                _filelist.append([path,item])
            
def change(str1,str2):
    convert = "mencoder -oac lavc -ovc lavc -of lavf -lavcopts aglobal=1:vglobal=1:vcodec=mpeg4:acodec=libfaac -af lavcresample=24000 -vf harddup,scale -zoom -xy 320  -ofps 30000/1001 %s -o %s" % (str1,str2)
    print convert
    os.system(convert)

if __name__ == '__main__':
    if len(sys.argv) > 3:
        print "cpsp filepath outputpath"
    exit(0)
    elif len(sys.argv) == 3:
        change(sys.argv[1],sys.argv[2])
    elif len(sys.argv) == 2:
        print "change all media file"
        getFile(sys.argv[1])
        for item in _filelist:
            print os.path.join(item[0],item[1]),"/melo/mp4/"+item[1]+".mp4"
            change(os.path.join(item[0],item[1]),"/melo/mp4/"+item[1]+".mp4")