Batch rename movie files

renamer.py

# To run this script, simply call
# $ python renamer.py "/path/to/folder" "S01" " - "
# This will take a file with a divider in it and add
# the appropriate formatting to work better with 
# Plex Media Server. 
# i.e. "Season 1 Episode 21 Episode Name.mp4" would become
# "S01E21 Episode Name.mp4"

import os
import sys

if len(sys.argv) < 3:
    print('You must specifiy a folder and a season')
    sys.exit(1)

folder = sys.argv[1]
season = sys.argv[2]

divider = ""
if sys.argv[3]:
	divider = sys.argv[3]

renamed = False

os.chdir(folder)
for (index, file) in enumerate(os.listdir(folder)):
	if file.lower().endswith((".avi", ".mp4", ".m4v", ".mkv")):
		if divider in file:
			start = file.index(divider) + len(divider)
			end = len(file)
			fileName = file[start:end]
			newFileName = season + "E" + str(index + 1) + " " + fileName
			os.rename(file, newFileName)
			renamed = True

if renamed:
	print("Renamed %s files in %s" % (len(os.listdir(folder)), folder))
else:
	print("There were no files that needed renaming")