Castles II video

• Game: Castles II
• Extension: .M

This is a simple animation format presumably created by Byon Garrabrant and used in game to show a grayscale film footage (for other animations Interplay MVE is used).

Header:

 10 bytes - "BYON PIZZA"
 2  bytes - height
 2  bytes - width
 2  bytes - unknown

Then video frames follow, each starting with 16-bit size.

Frames are split into 2x2 tiles and use the following opcodes to decode them:

• 0-63 -- this is the first pixel value, other three pixel value follow
• 64-127 -- fill tile with the value of low 6 bits of the opcode
• 128-255 -- skip 0-127 tiles

Video uses 64 greyscale shades with 0 corresponding to white and 63 corresponding to black.