Playback issues when merging 2 .m2ts files, need help

[Mega-Prime]

I am in the process of ripping my LOTR: Extended Edition Blu-Rays so that I can merge both discs & put them on my Media Server to watch them uninterrupted. Simple premise, but I am running into a bit of a problem.

I started by ripping both FOTR discs using DVD Fab, then joined both parts with TSMuxer. Simple enough, & it works... sort of. I can play the file through my WD Live Box using Plex Media Server but it shows the runtime as 00:00:00 so I can't fast forward or rewind and if I stop the movie for whatever reason, I have to start from the beginning again.

Usually, when this happens with other media files its because Plex is transcoding it on the fly, but when I check the streaming status it says it's "Direct Play", so it's just streaming the file directly to the Media box without any intervention.

I'm sort of new to this, but I'm guessing it has something to do with the time signatures being off after merging the two parts together since they both play correctly if streamed separately.

Is there any software out there that I can run the merged file through, (59.7 gigs), that'll analyze & fix this? (I don't care if I lose chapter breaks).


PS: I realize I can keep both files separate & just queue them together, but that's no fun.

[Baldrick]

What does MediaInfo say about the runtime?

I would try another joiner... Maybe MKVtoolnix / mkvmergegui but you will get a mkv.