自动给coursera课程添加字幕加班

addsrt.py

#coding=utf-8
import sys, os, subprocess
dir_ = sys.argv[1]
command = 'mencoder -oac mp3lame -ovc lavc -lavcopts vcodec=mpeg4 -sub "%s" -subfont-text-scale 1.8 -subpos 95 -sub-bg-alpha 240 -utf8 -o "%s" "%s"'
for fn in os.listdir(dir_):
    name, ext = os.path.splitext(fn)
    mp4_file = os.path.join(dir_, fn)
    srt_file = os.path.join(dir_, '%s.srt'%name)
    if ext == '.mp4' and os.path.exists(srt_file):
        print fn
        output_dir = os.path.join(dir_, 'srt')
        if not os.path.exists(output_dir):
            os.mkdir(output_dir)
        output_file = os.path.join(output_dir, fn)
        c = command%(srt_file, output_file, mp4_file)
        subprocess.call(c, shell=True)