I know Panasonic BluRay players have the reputation of being quite sniffy about the files thrown at them but there is something broken in AVIdemux 2.6. I know this because 2.5 joins the .MOV files from my Canon SX150 & my BDT130 plays the resulting .mkv file just great (apart from a slightly annoying clicking). However 2.6 is a totally different story; stuttering sound followed by an eventual player crash.
Format of audio ?
Of video ?
It might worth trying with a nightly