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I use dual layer dv mp4, I don’t think I can merge the files

You need to merge the m2ts files when you are demuxing the BL, EL and audio files.
To do this with ffmpeg
1- create a txt file contening a list of the files to merge
exemple : m2ts_list.txt
file 'F:\000731.M2TS'
file 'F:\000732 ...

Yesterday I merged the 2 videos (using mkvtoolnix) of The Lord of the Rings: The Fellowship of the Ring, and with mp4muxer (dual layer) for DoVi. I've played it on my LG TV via external HDD and the video stutters (laggy)

Hello. I don't know how to mux the .dtshd to the .mp4 (muxed with mp4muxer), I've tried with mp4box but it says this message

E:\gpac-0.9.0-DEV-latest-filters-x64>MP4Box -add 2.dtshd dsd.mp4
[FFDmx] Fail to open 2.dtshd - error Error number -360024468 occurred
[Importer] Error probing 2.dtshd
Error ...

Doing the first post, will that be enough to have the best version? Or was there some advance in the entire discussion. I already tried with matrix and transformers, and everything ok with the tv