Coverting Millisec to frame FPS for FXP import XTI

Thank you this importer. It has been huge help when working with translators in other countries.

However, I need to be able to adjust the time-code to align with my video editing software Final Cut Pro X. When I import the subtitles from aegissub there is a time shift because the timecodes formats are different milliseconds versus frames. It does not seem I can adjust these formats in either aegisub or FCPX. When I create the srt to FCPXML. I beleive it is expecting FPS and converting the MS which is creating a shift when I try to align the subtitles up in FCPX.

What work flow do you suggest to import subtitles from Aegisub into Final Cut Pro X to void timecode shifts and line the subtitles up with the dialog using XTI to generate the xml.

I would appreciate the guidance.
Thank you,
Steph