Personally I use Pavtube MTS/M2TS Converter for MAC to handle my mts
and m2ts files, before using it, I've tried many ,many different sorts
of converters, virtually all of them can transfer mts/m2ts to other
common formats, but always bring problems one or another, like
terrible conversion speed, audio and video out of sync, etc. This one
does not have these issues, so it won my appreciation.