Great thanks, got it to work.
I encountered a problem though.
The Blu-Rays im trying to sub are episodes , but they only have 1 big playlist , one has both episodes as 1 m2ts , i guess there wont be any problems if i sync the merged subs to that m2ts , however the other has the episodes as seperate m2ts (and only 1 big playlist).I tried using the mpls which worked but tsmuxer merged both m2ts as 1 m2ts and the subs were desynched from episode 2 onwards.Since there arent any single mpls for the episodes im not sure how to mux em.