How to convert .m4v videos to .mt2s format.
Converting iTunes Video Files directly to .mt2s files (.m4v to .mt2s conversion) is not possible, since .mt2s is a non-existing format.
Perhaps this is just a typo, and you are actually searching for ways how to convert iTunes videos to Blu-ray BDAV Video Files. In that case, please refer to the .m4v to .m2ts conversion entry.
In a word, direct m4v to mt2s conversion is not possible.
So don't expect any so-called m4v to mt2s converter or m4v to mt2s free online conversion tool available.
The database currently does not contain any m4v software converter.