a simple cli tool to change the subtitle files delay and fix the encoding.

subtitle.py

import pysubs2
from optparse import OptionParser
from charset_normalizer import detect

def main():
    # parse the options
    parser = OptionParser("python %prog [options] --shift 2s FILE.srt")
    parser.add_option("-s", "--shift", dest="shift", type=int,
                    help="shift the subtitle time forward.")
    # check the options values
    options, args = parser.parse_args()
    
    if not args:
        parser.error("Please give a subtitle file path.")
    # open file and detect encoding
    subtitle_file = args[0]
    with open(subtitle_file, 'rb') as file:
        encoding = detect(file.read())['encoding']
    
    # open with pysub
    subs = pysubs2.load(subtitle_file, encoding=encoding)

    if options.shift:
        # shift the seconds
        subs.shift(s=int(options.shift))
    # save the output
    subs.save(subtitle_file, encoding="utf-8")

#delay = int(input("Enter the subtitle delay : "))

if __name__ == "__main__":
    main()