How to Convert MTS/M2TS files to QuickTime on Mac (QuickTime X included)
If your AVCHD camcorder can't be recognized by iMovie, you will probably need to convert the MTS/M2TS files to QuickTime for playback or editing on Mac OS X. Or you'll have to view the footages on the camera or playback the videos with other players. If you have QuickTime X installed, you can also share videos to YouTube easily if you convert the MTS/M2TS files to QuickTime format.
Just follow the 4 easy steps to convert MTS/M2TS to QuickTime(X) on Mac
1Download and install MTS to QT Converter for Mac
Download this professional yet easy to use MTS to QT Video Converter for Mac (Get Intel version, PowerPC version here), double click the .dmg image to install it.
2Load M2TS/MTS files
Launch the Mac MTS to QT conversion tool, drag and drop the MTS/M2TS clips to the program or click "Add file" button to load MTS/M2TS files.

3Select "QuickTime MOV" from the output format list.

Note: If you just want to import certain segment of the MTS/M2TS clips for editing, you can trim the clip before conversion.

4Hit "Convert" to start converting MTS/M2TS clips to QuickTime
This smart MTS to QT Video Converter for Mac can automatically switch off the computer when the conversion is done, so you don't need to wait around during the conversion. The output QuickTime files can be played with QuickTime or for editing in iMovie, and Final Cut Pro.

