Descent20071080pblurayh264aac -

While many initial copies used AVC (H.264) , there was a documented manufacturing variation where some discs were released using MPEG-2 encoding. Aspect Ratio: 2.35:1 (Widescreen).

For fans of the film, here are the technical details:

: The video compression codec. Also known as MPEG-4 Part 10 or AVC (Advanced Video Coding), H.264 is the most universally compatible video codec on earth. It balances great visual clarity with efficient storage sizes.