It is possible to record MTS footage up to 1080p 60pfps with Sony HDR-GW77V will be many people's best choice. If you wnna link the camcorder to Mac for editing the rcordings in iMovie 10.0.3 for sharing with family, please note that iMovie doesn't support 60p AVCHD. You'd better shoot 1080i and 720p AVCHD files. However, if you have got some Full HD 60p MTS files from GW77V, you'd better to transcode AVCHD to AIC before ingestuing to iMovie.
iMovie '11 (Version 9.0) and earlier will transcode AVCHD into AIC, greatly increasing file size, reducing video quality and wasting a lot of time in the process. The 10.0 update made many changes, supporting for iPhone 5-esque panoramic photos and much-improved supporting for AVCHD and improved performance on 64-bit machines among other changes. However, though the new iMovie 10.0.3 can import and native edit AVCHD, but the AVCHD clip play back from the timeline though may be very choppy, especially 1080 60p AVCHD footage. And you must have a fast GPU in order to effectively edit AVCHD or it will be annoying.
The best format of iMovie 10.0.3 is MOV with AIC codec. For iMovie 11. it can play AIC at 720p, 1080i and 108024p/30p. To get the best qulity for editing, I prefer to get the 1080 30p video. Sometimes, I want to get a smaller file, I choose the 720p AIC for converting to. In a word, the AVCHD to AIC conversion help me a lot.AunsoftiMedia Converter for Mac is not bad to transcode AVCHD .mts/.m2ts/.m2t clips to a compatible format for editing with iMovie. In fact, I know it still has a lot of functions, such as for converting to other format, as well as it can be workd as a video editor.
Step 1. Install and run the MTS/M2TS Converter on Mac and import 60p or 50p files from GW77 into it.
Step 2. Choose “Apple Intermediate Codec(AIC) (*.mov)” as the best output format from "format > iMovie and Final Cut Express".
Step 3. Click "Settings" to freely set video resolution(1920×1080/1440×1080/1280×720/720×480), bitrate（from 1Mbps to 20Mbps）, frame rate (24p/25p/30p).
Step 4. Start the fast conversion by clicking "convert" button.
As soon as the MTS to iMovie 10.0.3 conversion is over, you can get the converted MTS file by ticking "open" to iMovie to smoothly edit. After the use, you will find iMedia Converter forMac is an easy-to-use program with a simple interface. Besides, you will also find it is an powerful Mac OS X MTS Converter.