A simple Python script to add an intermediate (or initial) time slot in .srt subtitles files.
Useful when video has an ad but not the SRT file.
Example (add 23 seconds after minute 12):
Before:
181
00:12:02,801 --> 00:12:04,909
The IT Crowd continues next!
After:
181
00:12:25,801 --> 00:12:27,909
The IT Crowd continues next!