I'm not sure it runs on linux, but check out TheaterTek.com, TheaterTek is very popular for people using HTPC's. I've only used it on windows environment. One feature is that it allows for trailers and custom aspect ratios. Nvidia Cards are also recommended.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85