ok, if you want a movie to fit on a dvd you can either encode it as a XVID/DIVX, this can only be played on your computer or a special DIVX player but not on a DVD player. There is a program called DVD Shrink that can compress a movie > 4.5gb so it will fit onto a Single Layer disc, i suppose you can use it to compress it < 700mb so theoretically it will play in a normal DVD player but:
1. The quality wont be good.
2. The DVD player might not like playing dvd files of a CD.
Core 2 Duo E6400, DFI Infinity 975X/G, 2x 512mb DDR2 667mhz, Albatron 7900gt, WD 200gb SATA, Samsung DVD-RW, Silverstone ST-50EF 500w PSU.