Select correct PID for sound playing TS files

has anyone any experience serving ts files such as would be recorded my MediaPortal? Such files play via Serviio brilliantly to my Panansonic BluRay player, but the default sound track (highest PID) is MPEG which carries the Narrated soundtrack. Leaving the lovely ac3 soundtrack ignored! It's possible to strip off the mpeg soundtrack using a program such as tssniper and if this is done, the ac3 soundtrack is passed through with no problem.
My question is: is it possible to select the correct soundtrack that Serviio sends and if so, how? So it's an issue of selection rather than transcoding. Programs such as MediaPortal have a 'prefer ac3' option in their configurations. It would be great if Serviio did too!
My question is: is it possible to select the correct soundtrack that Serviio sends and if so, how? So it's an issue of selection rather than transcoding. Programs such as MediaPortal have a 'prefer ac3' option in their configurations. It would be great if Serviio did too!