I'm trying to remux one of my 3D discs to add an atmos track, and have an odd issue with TSMuxer (via the GUI v2.6.12) not splitting the file. The meta params it is generating is showing --split-size=4GB, but the files generated just aren't split, and are showing some odd sizes, some over 9GB.

I opened the title via the .MPLS for the 3D movie title.

It does the same for ISO and AVCHD.

Any ideas? Or any other suggestions?