Either mux to m2ts using tsMuxeR, then reprocess through tsremux to Blu-ray. Or input your recoded video (must be m2ts) into tsremux, and the THD track directly from the BD rip into tsremux (with your encode). Either way you need to use tsremux to get your BD output for THD. EDIT: I think the 6-7% rule applies when we use an h264, AC3 or DTS stream for a DVD5 or 9... I mean when we agreed on the rule that's all we were encoding to. Here is a comparison of raw audio from The Dark Knight. The first shows the TrueHD track, then muxed to M2TS alone. Notice the 1GB increase in size, ~33% of an increase. The second comparison is the same TrueHD track converted to PCM, then that PCM track in M2TS alone. Notice the increase in size is not nearly as much, around a 7% increase. Also, this audio track has a bit depth of 16 bits... that's a huge PCM track! TrueHD Comparison PCM Comparison Conclusion; I'm pretty sure the m2ts overhead depends on content and is not a fixed amount.