python script to batch harsub video using ffmpeg

harsub_local_videos.py

import os, time

start_time = time.time()

#good tuning for compromise quality/weight
tuning = '-c:v libx264 -x264opts keyint=60 -pix_fmt yuv420p -preset medium -crf 19 -c:a copy -y'
ext = 'srt'

cwd = os.getcwd()

for i in os.listdir():
	if i.startswith("sub_"):
		for srt in os.listdir(i):
			if srt.endswith(ext):
				fullname = srt.split('.')[0] #sauce_EN
				video = fullname.split('_')[0]#sauce
				videoIn = video + '.mp4' #sauce.mp4
				videoOut = fullname + ".mp4" #sauce_EN.mp4

				fullpathVideo = os.path.join(os.path.abspath(i), videoIn)
				# print (fullpathVideo)

				fullpathSub = os.path.join(os.path.abspath(i), srt)
				# print (fullpathSub)

				fullpathOut = os.path.join(os.path.abspath(cwd), videoOut)
				# print (fullpathOut)
				os.chdir(os.path.abspath(i))
				# print (os.path.abspath("."))
				cmd = 'ffmpeg -i "{0}" -vf subtitles={1} {2} "{3}"'.format(fullpathVideo ,srt, tuning, fullpathOut)
				print(cmd)
				os.system(cmd)

				os.chdir(os.path.abspath(cwd))

print ("elapsed time:", time.time() - start_time)