Convert MT2S to M4V

Converting .mt2s files directly to iTunes Video Files (.mt2s to .m4v 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 Blu-ray BDAV Video Files to iTunes Video Files. In that case, please refer to the .m2ts to .m4v conversion entry.

Simply put, it is impossible to convert MT2S to M4V directly.
Thus, there is no so-called mt2s to m4v converter or a free online .mt2s to .m4v converter to be found.