Subtitle-shifter is a project mainly written in Python, it's free.
If you have a subtitle file (.srt usually) that is off from your movie file, shift it with this script.
Subtitle Shifter does an easy bit of string manipulation and datetime math to shift your subtitles to match your film.
USAGE:
$ python shiftsubs.py
source_file: The file to read from write_file: The file to write to time_change: The change in seconds to shift the subtitles, e.g. 2 or -5
You can contact me here: http://delw.in/