I was looking for ways to use external subtitles with DVD movies and have found several solutions (amongst others, MPC-HC).
But I was surprised that VLC was not a solution here - and I imagine some settings are possible. I have tested different settings for the Video Output, but then the subs disappeared etc when for a moment it seemed to work: subtitles may disappear from time to time or appear for too short a time, or they may fully disappear after seeking back or forth withing the video.
I have tested this in Mac, Windows and Linux.
Are there some tweaks under the hood in order to make it work in VLC?