Summary: The easy workaround to get iMovie work with Panasonic DMC-LX7 60p footage is to Convert MTS to Apple InterMediate Codec(AIC) MOV which ensures the best result when using in iMovie 08/09/11.
Panasonic Lumix DMC-LX7 is capable of recording Full HD video in either the AVCHD Progressive or MP4 formats. Frame rates depend on your region - the European model records AVCHD at 50 fps and MP4 at 25fps, while the US model runs at 60 fps and 30 fps respectively. The lens can zoom and refocus during recording too. After showing off your Full HD videos, you will be disappointed when you want to import Panasonic DMC-LX7 60p/50p footage to iMovie for further editing and find all MTS files are greyed out.
There are mainly two reasons why you can not transfer video files from Panasonic DMC-LX7 iMovie, incuding iMovie 8/9/11. Firstly, the recordings with the codec H.264/MPEG-4 are highly compressed for saving storage space and smooth playback, but the H.264 files are not suitable for editing, so editing H.264 MTS files in iMovie is always a headaching problem for editors. Secondly, up to now, iMovie can not always successfully recognize footages at 60fps nor at 50fps. So if you want to ingest DMC-LX7 60p/50p AVCHD footage to iMovie, you will always meet the importing problem.
Fortunately, there is an easy way to fix the issue. Since Apple InterMediate Codec(AIC) is the the most compatible codec introduced by App which ensures maximum editing quality and efficiency when working with iMovie, the common practise for Panasonic DMC-LX7 MTS workflow with iMovie is, get a Mac AVCHD to AIC Converter and transcode Panasonic DMC-LX7 .mts footage to AIC MOV, which will save you both time and trouble, and all you need is to drag the result videos for prompt editing. For this purpose, this article will show you how to transcode Panasonic DMC-LX7 MTS to AIC MOV in detail.
How to Convert Panasonic DMC-LX7 60p footage for Editing in iMovie smoothly
Step 1: Download, install and run Brorsoft MTS Converter for Mac, and then click the "Add" button to load the .mts videos. You can also use the drag-and-drop method to load the 1080p .mts files to the application UI.
The program is an easy-to-use yet professional app which can be used as a Panasonic Lumix video converter under Mac OS X 10.9 Mavericks, 10.8 Mountain Lion, 10.7 Lion, Snow Leopard 10.6, Leopard 10.5. It is free, clean and safe to install and use. With it, you can effortlessly transcode AVCHD MTS to AIC MOV for iMovie 08/09/11, Apple ProRes MOV for Final Cut Pro X/7/6, DNxHD for Avid MC, etc. and it works well and converts flawlessly.
Step 2: Click the Format box and select iMovie --> Apple InterMediate Codec(AIC) (*.mov) as output format.
Tip: Please set 1920*1080 as video size, 30fps for users in NTSC area and 25fps in PAL area as video bitrate to get the best video quality. If you want to get a smaller ones, please decrease the video size from 1920*1080 to 1440*1080 or 1280*720.
Step 3: Click the “Convert” icon under the preview window, and the Mac iMovie AIC Converter will start transcode Panasonic LX7 MTS to AIC MOV for iMovie 08/09/11 on Mac.
After the conversion, click "Open" to locate the result videos and then launch iMovie,choose File > Import > Movies..., to import the converted 60p or 50p AVCHD footage into iMovie; prepare for editing. You will find that it's just a piece of cake to edit Panasonic DMC-LX7 60p/50p video files in iMovie.
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Source:How to import movie from Panasonic DMC-LX7 to iMovie