MP4Splitter V3.8 doesn't have a toggle to retain embedded subtitles after splitting. You may want to use alternative software like MKVToolNix or HandBrake, ensuring to select the option to keep embedded subtitles intact while splitting your MP4 files.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
MP4Splitter V3.8 does not retain embedded subtitles after splitting. Is there a toggle that will not delete the subtitle after splitting?
MP4Splitter V3.8 doesn't have a toggle to retain embedded subtitles after splitting. You may want to use alternative software like MKVToolNix or HandBrake, ensuring to select the option to keep embedded subtitles intact while splitting your MP4 files.