Converting .m2ts files to .mts format.
Converting Blu-ray BDAV Video Files directly to AVCHD Videos (.m2ts to .mts conversion) is certainly possible, and should be quite straightforward.
Use one of numerous currently available video editing programs or video conversion tools, such as Free Studio or Freemake Video Converter, which should be capable of converting .m2ts to .mts.
A free video conversion utility
Multimedia encoding application from Adobe
A timeline-based video editing software from Adobe
Suite of tools for video editing
All-in-one package of DVDVideoSoft utilities and converters
One of the most popular and successful free video conversion softwares
A multimedia converter
A multimedia importer for iTunes
Video capturing software from Nero Suite
A powerful and free video converter