Uhh I’m just adjusting the speed property of one clip or many clips, they’re at lossless quality 6fps (for timelapse) and while at 10x speed they work fine, but when at anything over 12x speed the entire video speeds up. Genuinely I have no idea if I’m somehow tinkering with things beyond the scope of just the one clip, but I don’t think so.
EDIT: I’m using OBS, set to lossless quality 6fps for the source video. The format is avi.