is there a new to burn a movie by the size of the files and not the mins cause i am trying to get like 3 movies on one dvd and the size of each of the movies is like 1gb so it will fit but it goes by mins
Try DVD Shrink with DVD Decrypter to burn. Neither of these programs use minutes. Nero Recode2 will work as well.
If you just want to join movies together you can do it with Shrink DVD2One or several other programs. With Shrink it is just a matter of Using Open Files and then browsing for the remaining movies. you just drag each one into the compilation window and back them all up at once. Shrink will join them and create the correct nav structure.