Had a similar experience, but it was a video of a guy who got run over by a truck, or in more accurate terms…smushed into its radiator. There was not a lot left that could be recognized as a normal human body, but he was still alive and crying for help.
I’ll also never forget that, fucking traumatizing thing. I believe the Nokia phone camera quality which was usual back then made it even worse, because there were missing details you couldn’t see, only imagine.
Just use smplayer as the frontend for mpv and you’re all set.