Ok... according to a guide i found here in order to be able to put subtitles in a movie you must "demux" it with vobedit and then join all the elements with ifoedit.
The problem is that to do this i must have only one .vob file.
The movie i'm trying to put subtitles in it's divided in more than one .vob files (like all movies i suppose). I've tried it merging them in one single .vob with both "dvdshrink" and "vob merge" but with both programs i get an error near the end of the process (in dvdshrink says that there's not enough disk space wich is not true and in vob merge says I/O error).
I guess it must have to do something with the size of the file cause the movie plays fine.
So... anyone knows why i get an error??
If not, is there another way to put subtitles without merging the vob files?