Adding timestamp crashes program because of slashes

[Adam-Kay]

Bug Description

When the proposed output file already exists, the program attempts to append a timestamp to the filename to ensure its uniquity. Due to the locale on many systems, this date ends up being formatted as dd/mm/yyyy hh:mm:ss . The / character is illegal in file paths so the following encode fails.

Steps to Reproduce

1. Ensure a file already exists with the name that the batch encode would spit out. Usually <filename>-ENC.<ext>
2. Attempt to run the encoder
3. Program reports that a file already exists with this name and it will append a timestamp to mitigate filename collisions.
4. The program crashes.
   [[[include screenshot here]]]

Potential Cause

The timestamp being locale dependent. If possible, enforce the format to be something like yyyy-mm-dd_hh-mm-ss.