First it is important to decide whether the conversion between different frame rates should be based on time or on number of frames. This can be selected in Extras/Options/System/System settings
Some subtitle files contain information about the frame rate they were made for and some do not. Therefore it is important that the frame rate of the original subtitle file is selected correctly in Options before opening the file.
- First click on Extras/Options/System/System settings and select the frame rate that the original file was created for and click OK.
Open the subtitle file.
Click on File / Export.
Select the format and frame rate the file should be exported to.
- Click OK to export a new subtitle file with different frame rate.