HNM

HNM is a multimedia format used in almost every computer game by CRYO.

During it's lifetime, format has been changed at least 6(+1) times.

HNM (0) aka HNM Zero. Used in debut Cryo' games - Dune (floppy version) and KGB to display animated Cryo logo. Uses typeless chunks and single rotated palette for the whole movie. No sound.
HNM (1) Improved version, with typed chunks, dynamic palettes and (optional) soundtrack.
HNM4 First version, where HNM tag explicitly written in the file header. Used in many games released during 1995-1997.
HNM4 (A) Hi-resolution format spin-off, used in ALIENS game. While all file tags indicates genuine HNM4, interframe (de)compression is not compatible.
UBB Another hi-resolution spin-off, first appeared in MegaRace 2 game. Same file structure as in HNM4, but completely reworked codec.
HNM6 Finally, movies comes in hi-color. Based on JPEG compression.
Currently, Kheops Studio uses HNM-successor called KSV to carry XviD-encoded FMVs.

This forum discusses the coding algorithms used in the format: http://dune2k.com/forum/index.php?topic=18539.90

Games Using HNM