Subtitle TC-Converter converts all timcodes from/to many different time bases. If requested, a timecode offset can be added or subtracted within the conversion.
Timecode offsets can be added or subtracted even without framerate conversion. Therefor, simply set the “New Framerate” to the value of the “Original Framerate”.
Notice: In order to keep rounding errors as small as possible, it should be absolutely avoided carrying out a frame rate change from an already converted STL file a second time.