A short python script I made to help me rename external subtitle files in my media server.
Straightforward, download and place the renamer.py to your show's directory.
Edit the code with any text editor and add the file extensions you have, by default it only looks for MKV, MP4 and .SRT
videoExtensions = ['.mkv', '.mp4']
subtitleExtensions = ['.srt']
Run the script (double click the file)
Pull requests are welcome.