Okay I think I got it cleared. There might be some misinformation around that I could recall and applied while testing these.
Installing the DVD, I got no video as usual and was stuck in the pink screen, the classic colour mode mismatch, I then applied the 1.04 patch. Installing the Elecard, DVD Express decoders, it didn't take me anywhere.
I then went to the GOG version because users said the DVD Express decoder was replaced with Xing (and the version of Xing I had was problematic for the Windows core) so for an attempt to secure this Xing, I installed the GOG game. There was no Xing decoder. It was just ffdshow installed over the game.
The game was configured with Xing Decoder. It is possible Xing was based on ffdshow, and thus ffdshow worked when Xing was configured. Installing just ffdshow and setting Xing as decoder made sure the videos player, however they wouldn't display unless I put VideoMode=8 in Tex.ini
There is a NoDVD for the game around, but I didn't need it. Now the game crash...
Instead of using ffdshow installer or my one-time package, you can also use LAV, that also works. There are some issues here and there and the game is certainly not perfect...
previously known as Discrete_BOB_058