How to convert .avi files to .mt2s format.
Converting Audio Video Interleave Files directly to .mt2s files (.avi 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 AVI videos to Blu-ray BDAV Video Files. In that case, please refer to the .avi to .m2ts conversion entry.
In a word, direct avi to mt2s conversion is not possible.
So don't expect any so-called avi to mt2s converter or avi to mt2s free online conversion tool available.
The database currently does not contain any avi software converter.