If your camcorder model has no luck, you can also get rid of the trouble. In the case, you may need a third-party software, which can do the Canon Vixia AVCHD video converson on Mac OSX (Lion OSX included). It is known to all that Mac programs like iMovie, QuickTime or iTunes has good compability with MPEG4 or H.264 codec. So the easy way is to convert the original M2TS/MTS file format to Mac formats one with the Canon Vixia Video Converter for Mac.

Moreover, the program can convert Canon VIXIA video to Mac MOV, MP4, AVI, 3GP, MPEG-4 for Mac so that you can import these AVCHD MTS/M2TS files to iMovie'11, iTunes, iDVD, FCPX, FCE etc for editing. Besides, it also has powerful editing function like trim video length, crop video, set video brightness, contrast, and saturation, and customize video/audio output settings, etc.

Tip: Supposed you don't want to convert the orginal files, but cut the its time-length or combine multiple files, you can choose the Canon Video Editing for Mac

Detailed tutorial on how to upload the Canon Vixia Camcorder to Mac and convert Canon AVCHD on Mac:

Step 1: Backup the camcorder to Mac
Plug your camcorder into the AC adaptor, then connect your camcorder to Mac via USB plug, you'll find the recorded videos on a new drive, now you can copy the camcorder videos to your Mac hard disk.

Step 2: Load Canon AVCHD clip(s) to Mac
Launch the Canon AVCHD Converter for Mac, and load your camcorder .m2ts video files to the program.

Step 3: Choose the output settings
Select the output video format and specify the output folder to store the converted file(s). Supposed that you would like to further shooting in iMovie, you can select the "iMovie" as output file format. Alternatively, you can choose QuickTime, MOV, H.264, etc file format as output.

Step 4: Hit "START" button to start converting Canon Video on Mac