Surround sound question about blu-ray

[Rany1977]

I have a Samsung home theater system and on some blu-ray movies such as the Spiderman trilogy and other Sony movies.

Before the movie begins all five speakers are working, even on the main menu, but once I play the movie only the front three speakers and a subwoofer work.

With some movies, all five speakers work incredible. Like both national treasure movies, Rush hour 3, 30 days of night, Untraceable, the Brave One, both AVP movies. All the above movies and a whole bunch more all have surround sound on my home theater system.

The only movies that I can't get surround sound on are movies such as, the Spiderman trilogy, War, SuperBad, the other Bolyen girl.

Does anyone know why this is and how I can get it to work?

I have an LG HD DVD/BLU-RAY combo player and have it connected to my Samsung home theater system via optical digital cable.

Any help will be greatly appreciated. Thank you in advance.