thanks for the advice guys. so ghost with 1 round is my best bet to unlocking all the vids? is there a pattern to unlocking them? like every 5 ghost battles i win i get a vid?
No, all depends on luck.
But hey, if you're having a hard time defeating ghost after your character have leveled up so much, switch your character to beginner level character, rinse and repeat, you will get all endings in no time.
"There is no justice in using and deceiving people!"
Incidentally, the way you actually unlock endings is by beating characters who's names show up in a gold box when you are choosing your opponent(s). In the case of tag teams, you only get the ending of the point character
GT - hiltzy85 KOFXIII: Andy, Mai, Iori, Robert | TTT2: Steve, Bruce | SSFIV AE: Evil Ryu | SFxT: Kazuya, Bryan, Jin, Ryu, Steve