▁help ▁prevent ▁buffer ▁under run s ▁in ▁the ▁case ▁of ▁dirty ▁or ▁scratch ed ▁disc s ▁ ▁A im ing ▁to ▁improve ▁picture ▁quality ▁over ▁standard ▁ed itions , ▁Columbia ▁Tri Star ▁Home ▁Entertainment ▁offered ▁" Super bit " — a ▁prem ium ▁line ▁of ▁DVD - Video ▁titles ▁having ▁average ▁bit r ates ▁closer ▁to ▁ 6 ▁M bit / s . ▁Audio ▁quality ▁was ▁also ▁improved ▁by ▁the ▁mand atory ▁inclusion ▁of ▁both ▁Dol by ▁Digital ▁and ▁D TS ▁ 5 . 1 ▁surr ound ▁audio ▁tracks . ▁Multiple ▁languages , ▁angles , ▁and ▁extra ▁audio ▁tracks ▁were ▁elimin ated ▁to ▁free ▁up ▁more ▁space ▁for ▁the ▁main ▁title ▁and ▁thereby ▁to ▁ensure ▁the ▁highest ▁data ▁rate ▁possible . ▁In ▁January ▁ 2 0 0 7 ▁the ▁Super bit ▁line ▁was ▁dis cont in ued . ▁ ▁Other ▁features ▁ ▁Some ▁DVD ▁hardware ▁or ▁software ▁players ▁may ▁play ▁disc s ▁whose ▁M PE G ▁files ▁do ▁not ▁conform ▁to ▁the ▁above ▁standards ; ▁commonly ▁this ▁is ▁used ▁to ▁support ▁disc s ▁author ed ▁with ▁formats ▁such ▁as ▁V CD ▁and ▁SV CD . ▁While ▁V CD ▁and ▁C VD ▁video ▁is ▁supported ▁by ▁the ▁DVD ▁standard , ▁neither ▁SV CD ▁video ▁nor ▁V CD , ▁C VD , ▁or ▁SV CD ▁audio ▁is ▁compatible ▁with ▁the ▁DVD ▁standard . ▁ ▁Some ▁hardware ▁players ▁will ▁also ▁play ▁DVD - ROM s ▁or ▁CD - ROM s ▁containing ▁" raw " ▁M PE G ▁video ▁files ; ▁these ▁are ▁" un author ed