How do i burn an 8gb movie to a 4.7gb dvd?

ok so i have a toshiba a205-s5000 laptop..and i want to know first off if my pc is capable of burning dual layered discs..and if so do i need to buy special discs for that? or is there a way i can shrink it further? bc i use dvd fab and usually just then burn to disc with nero..but i tried dvd fab then i went and used dvd shrink and it wouldnt play on my dvd player so im lost please help!