▁including ▁the ▁majority ▁of ▁home ▁cinema ▁systems , ▁are ▁pres et ▁to ▁play ▁only ▁region ▁ 2 ▁disc s . ▁ ▁In ▁China , ▁DVD - V ideos ▁for ▁television ▁series ▁are ▁usually ▁released ▁in ▁M PE G - 1 ▁video , ▁with ▁MP 2 ▁audio . ▁By ▁for going ▁Dol by ▁standards , ▁manufact ur ers ▁cut ▁costs ▁consider ably ; ▁encoding ▁in ▁lower ▁bit - r ates ▁also ▁allows ▁a ▁TV ▁series ▁to ▁be ▁s que ez ed ▁onto ▁fewer ▁disc s . ▁There ▁is ▁no ▁region ▁coding ▁in ▁such ▁cases . ▁ ▁There ▁are ▁also ▁two ▁additional ▁region ▁codes , ▁region ▁ 7 , ▁which ▁is ▁reserved , ▁and ▁region ▁ 8 , ▁which ▁is ▁used ▁exclus ively ▁for ▁passenger ▁transport ▁such ▁as ▁air lines ▁and ▁cru ise ▁ships . ▁ ▁Program ming ▁interface ▁ ▁A ▁virtual ▁machine ▁implemented ▁by ▁the ▁DVD ▁player ▁runs ▁byte code ▁contained ▁on ▁the ▁DVD . ▁This ▁is ▁used ▁to ▁control ▁play back ▁and ▁display ▁special ▁effects ▁on ▁the ▁men us . ▁The ▁instruction ▁set ▁is ▁called ▁the ▁Virtual ▁Machine ▁( VM ) ▁DVD ▁command ▁set . ▁There ▁are ▁ 1 6 ▁general ▁parameter ▁registers ▁( G PR M ) ▁to ▁hold ▁temporary ▁values ▁and ▁ 2 4 ▁system ▁parameters ▁( SP R M ). ▁As ▁a ▁result ▁of ▁a ▁moder ately ▁flexible ▁programming ▁interface , ▁DVD ▁players ▁can ▁be ▁used ▁to ▁play ▁games , ▁such ▁as ▁the ▁DVD ▁re - release ▁of ▁Dragon ' s ▁La ir , ▁along ▁with ▁more ▁s oph istic