▁DVD + V R ▁standard ▁defines ▁a ▁logical ▁format ▁for ▁DVD - Video ▁comp li ant ▁recording ▁on ▁optical ▁disc s ▁and ▁is ▁commonly ▁used ▁on ▁DVD + R / R W ▁media . ▁ ▁Sub tit les ▁ ▁DVD - Video ▁may ▁also ▁include ▁up ▁to ▁ 3 2 ▁sub title ▁or ▁sub picture ▁tracks . ▁Sub tit les ▁are ▁usually ▁intended ▁as ▁a ▁visual ▁help ▁for ▁the ▁de af ▁and ▁hearing ▁imp a ired ▁and ▁for ▁transl ating ▁dialog s . ▁ ▁Sub tit les ▁can ▁serve ▁other ▁purposes ▁as ▁well . ▁For ▁example , ▁in ▁the ▁DVD ▁release ▁of ▁Th ir teen ▁Days ▁one ▁of ▁the ▁sub title ▁tracks ▁includes ▁history ▁notes , ▁giving ▁additional ▁information ▁tim ed ▁to ▁the ▁events ▁dep icted ▁in ▁the ▁film . ▁In ▁the ▁release ▁of ▁For ▁All ▁M ank ind ▁subt it les ▁display ▁names ▁of ▁the ▁NASA ▁miss ions ▁and ▁names ▁of ▁the ▁people ▁shown ▁on ▁the ▁screen . ▁Sh a un ▁of ▁the ▁Dead ▁also ▁features ▁t riv ia ▁facts ▁about ▁the ▁making ▁of ▁the ▁film ▁on ▁its ▁subt it les ▁menu . ▁ ▁Sub tit les ▁are ▁stored ▁as ▁bitmap ▁images ▁and ▁therefore ▁can ▁contain ▁messages ▁in ▁any ▁language . ▁Sub tit les ▁are ▁restricted ▁to ▁four ▁colors , ▁including ▁transparent ▁" color ", ▁and ▁thus ▁tend ▁to ▁look ▁cr uder ▁than ▁permanent ▁subt it les ▁on ▁film . ▁Trans par ency ▁allows ▁lay ing ▁subt it les ▁over ▁the ▁video ▁during ▁play back . ▁The ▁sub title ▁tracks ▁are ▁contained