What software are you looking for ?
"AVCHD (.M2TS) video is recorded using the MPEG-4 AVC/H.264 video compression codec. And chances are you will come in contact with it more and more in the future. Presently, the default media players from Microsoft (Windows Media Player) will not play AVCHD natively. That’s why third party decoders are required. AVCHD video Converter can play, edit and convert AVCHD files simply by importing the footage from hard drive, the powerful codec pack designed within the program will then automatically analyze AVCHD format then transcode them to your delivery formats. All the process can be done within minimum time at fast speed, while original video quality is kept. .....
