The batch can convert files from one format to another.
During the conversion, you can use macros modify the subtitles, including their times.
•Launch the macros editor, and create a new macro.
•Add two utilities to your macro: one to change the frame rate, another to multiply the times.
•Save the macro with a descriptive name, and use it in your batch conversions.
You may also need to include an utility to fix the subtitles separation.