amfglobal, there are free PC tools which may just add a few bytes to m2ts and create BD structure, including chapters and subtitles:
tsMuxer,
TSRemux,
BD Edit. Check also
eac3to which is great for demuxing a HD source.
Sorry, I'm not aware of similar Mac freebies.
Interesting discussion and guides you may find at
doom and
videohelp forum.
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