If you like to edit your home movies with iMovie, then you will have some problems when trying to import MTS to iMovie since .mts (.m2ts) video files produced by Sony, Canon, Panasonic, etc. camcorders are not supported by iMovie. To get these MTS videos accepted by iMovie (iMovie 11), you'll have to convert MTS to iMovie friendly video format like MP4 with a video conversion tool.
Here Aimersoft Video Converter for Mac is highly recommended as the best MTS to iMovie converter to convert .mts and .m2ts files to iMovie compatible videos with ultra-fast conversion speed and lossless video quality so that you can add the video to iMovie for editing. It provides the video preset for iMovie so you don't need to worry about the compatibility. In addition, output formats like MOV, MP4, AVI, WMV, MKV, FLV, etc. are provided and 150+ video presets for portable devices like iPhone, iPad, iPod, etc. are offered for your choice. Just download it and follow the steps to get your work done.
Download MTS to iMovie Converter:
After downloading, double click the .dmg file to install and run the converter. The software interface is as below. You can either click File > Add Video Files or drag and drop videos to the item bar to add the files you want to convert for iMovie. Batch conversion is well supported so can add multiple videos at a time.
The video preset for iMovie is provided here. Open the format list and select iMovie from Editing as the output video format. As you see, you can also convert your MTS video to Final Cut Pro, iPhone, iPad, iPod, Apple TV, etc.
OK, now let's go to the last step: click the Convert button to start converting the added MTS video to iMovie. The conversion will finish soon if your videos are not too large. After the conversion, the destination folder will open automatically. Then start iMovie and click File > Import > Movies to import the converted video files to iMovie.
Here is the vide tutorial on how to convert camcorder MTS to iMovie:
More about MTS/M2TS and iMovie
Actually, iMovie works with lots of camcorder, including the HD AVCHD camcorders. Then you may be wondering why you still fail to import MTS files to iMovie. Here are some possible reasons:
1> MTS/M2TS videos are only compatible with iMovie when your Mac's processor is an Intel-based Core Duo or above.
2> You can directly add MTS/M2TS videos to iMovie from your camera (Connect your camera to Mac via a USB cable and set it to the Play Mode. Run iMovie and click File > Import from Camera to load the MTS videos from your camera.) However, after you transferred the videos to computer, the file structure has changed and iMovie won't accept them. What's more, not all AVCHD camcorders are supported. You can have a look at iMovie compatible cameras at: http://help.apple.com/imovie/cameras/en/index.html?lang=en_US