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There are 2 big problems with adding m2ts support to mkvtoolnix:
(1) Some audio tracks might need transcoding to make sense. E.g. there's no current standard to store TrueHD in MKV. So TrueHD would have to be transcoded to something else. Or alternatively the Matroska "official forces" would have to be asked to add an official method to mux TrueHD into MKV. But even if that happens, mkvtoolnix would still have to be able to strip the AC3 frames from the TrueHD stream. That's possible to do, but can't be developed in 5 minutes.
(2) Some Blu-Ray movies consist of multiple m2ts parts. Simply demuxing video/audio and remuxing them into MKV would result in audio slowly drifting out of sync throughout the whole movie because audio overlaps in these m2ts parts while video (usually) does not.
As a result I'm not sure if it's worth it for Mosu to add m2ts support. However, @Mosu, if you want to add ts/m2ts support, when you have any technical questions, feel free to contact me.
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