Take a look at DVDSupEncode cli options.
Frame size seems to be full (720x576, 720x480, 352x240), defined in DVDSupEncode.ini.
Don't know if 1920x1080 bitmap res will then be a valid input for SubRip.
Maybe try to export @1920x1080 and feed SubRip with these bitmaps ?
If SubRip does not accept, try a PAL or NTSC resize ?
But I don't what the bitmap will look like after a resize ...
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