Since I have nothing better to do (or the pending stuff makes me thinks I have nothing better to do), I search for a game to look at (preferably with a custom video format with an extension starting with ‘o’, ‘w’ or ‘y’ but any undocumented custom video format would do).
One of those games was Blood & Lace (despite the name it’s not about somebody cutting fingers while trying to put shoes on; whatever—I mostly study games, not play them). It had some videos using Indeo 4 or 5 plus some animations apparently on the game engine. Those were compressed as well as all TGA files. So out of curiosity I looked at the binary specification and apparently most of the files are compressed with LZH (the old compression method with dynamic Huffman coding used in LHA) using custom header starting with JFX1. And TGA files use JGF5 header which is almost the same but has image width and height in it before LZH-compressed data.
That’s another one in my collection of common LZ77-based methods used in multimedia compression, I wonder what will be next.