tl;dr: Reverse engineering of Sega CD Silpheed's FMV format reveals how Game Arts achieved impressive full-screen cutscenes on severely constrained hardware (12.5MHz 68k, 16 colors, 150 KiB/s, no framebuffer). Rather than shrinking real video like other FMV games, they engineered upward from hardware limits using clever tricks: aggressive tile reuse for solid colors (~50% savings), exploiting the Mega-CD ASIC's "font bit" register to expand 2-color tiles from bitmaps, bitmap-based tilemap compression via auto-increment, and palette-cycling for laser/explosion effects during gameplay.