Hi there, I've been experiencing this weird problem after I mux a video with .ass subtitles.

Basically, I use aegisub to do some subtitles. It involves typsetting and timing etc. Subs are timed so they snap to keyframes (i.e. cuts or scene changes) if they're near.

But then, after, when I use mkvmerge to mux a video with the subtitles and play the video, I realise all the subs are 2 frames forward for some reason - despite not being like that when I preview it in aegisub.

This weird problem only started recently and I have tried to figure out what I'm doing that leads to it, but with no success. I use CCCP codec with MPC-HC and I haven't changed the way I watch videos on my PC for years.