Handbrake Mac OS

For the conversion of MTS files to MP4 you can use Handbrake.

Mac OS X 10.7 and later

 

https://handbrake.fr/downloads.php

 

Make sure the conversion is in high quality. The same  as described under Format factory

 

Since this program does not have a merge/join function it is not preferable to use.
In stead, you can use Avidemux

 

 

Disclaimer

Because we do not have a Mac at our disposal, We cannot explain in detail how the program works.

So it is up to you to understand the details of the program and experiment with the software.