In Martian Gothic: Unification, the ending video (<path-to-game>\data\outro.bik) can be corrupted. The other videos aren't. If it is, when it should play the game crash. The used game installation was fully updated with all the available patches.
Can be tested if it's corrupted using the last RAD Video Tools/Bink and Smacker (Actually Bink 2021.3/Smacker 4.2e) and trying to playing it. If its corrupted it should play with big greens and blues squares as the screenshot. Also MPC-HC doesn't play the video (only the audio) but VLC plays it normally.
It seems it's about of using a different encoding than the others videos, which doesn't match the binkw32.dll bundled with the game. The game seems to be using Bink compatible with RAD Video Tools 1.0e (which is the one available when this game was launched), and the video is created with 0.8 or below, or a higher version.
So the attached video is the same video reencoded with Rad Video Tools 1.0e. To fix the video, change the original file in <path-to-game>\data\outro.bik with this one.
No need to point it out, but this is the ending and it has spoilers, although not the big ones.