I use to conver the 東方茱麗葉 becuse it dosn't have 因它在開始是沒有集數..
Sorry, don't quite understand what'd you mean.
It is the same principle to add watermarks or subpictures when converting. Use avisynth with the similar script. Or there is an easier way by just naming the subpicture with the same name of the file to be convert, put them in the same folder, if you have directvobsub(VSfilter) installed, the subpictures will be encoded automatically.