I posted an how to on my blog here
Underwater Video Tips: Working with AVCHD 2.0 and 1080p60 or 1080p50 files in iMovie « Interceptor121 Underwater Video
There is also a link to a video that shows how to import 1080p50 or 1080p60 mp4 files like those produced by GoPro HD3 Black into iMovie
All with free tools
Underwater Video Tips: Working with AVCHD 2.0 and 1080p60 or 1080p50 files in iMovie « Interceptor121 Underwater Video
There is also a link to a video that shows how to import 1080p50 or 1080p60 mp4 files like those produced by GoPro HD3 Black into iMovie
All with free tools