Doubt with conversion of DVD to XviD?

Hello guys!

I just converted a movie from DVD format to XVID with Auto Gordian Knot using its basic settings. The resolution of the original video was 720480 which the converted video has a resolution of 592256. Again, the original video was of 29.97 FPS which the converted one is of 23.97 FPS. Why this difference? How come the resolution and framerate went down when I didnt do any such setting? Will a lower framerate and resolution effect the video viewing in a normal television?