Great Porcess of Editing Sony FS700 AVCHD video in Sony Movie Studio 13
The following steps will guide you through the process of using Sony FS700 AVCHD video in your Sony Movie Studio 13 project.
"I shoot my family party with my Sony FS700 with the output video format of .MTS . I tried to do some editing on Sony Movie Studio 13. I have made some searches ,and i found that the Sony Movie Studio 13 can edit the file formats of mpeg2 and avi. So i am wondering how to convert mts file to mpeg2 and avi for me to edit on Sony Movie Studio 13? what software and programme should i need.and where can i get it. Thanks." 
To import and play Sony FS700 AVCHD MTS files in Sony Movie Studio flawlessly, we really have two options:
1) Get a much more powerful computer
2) Convert the MTS files to something less compressed like MPEG-2, AVI for Sony Movie Studio
Personally, I now would choose the second way and to get the work done, a MTS converter seems to be necessary. After trying 3+ MTS converter software on the market, I highly recommend Brorsoft MTS/M2TS Converter to convert MTS files to Sony Movie Studio 13/12/11 compatible format without loosing quality.
This software is very good & produces excellent results. I'm very impressed with the number of available output formats as well! It features optimal formats for Adobe Premiere Pro, Sony Vegas Pro, Windows Movie Maker, Avid Media Composer and more editing apps, resulting files with great image and sound quality without audio delay issues. 
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Simple Steps for importing Sony a7s AVCHD files into Sony Movie Studio 13
Step 1. Import MTS to the converter
Run the MTS to Sony Movie Studio converter and click the Add Files button to import the MTS videos to be converted. The converter supports converting multiple files at a time. 
Step 2. Choose target format
Hit the "Format" bar and select Adobe Premiere/Sony Vegas > MPEG-2 (*.mpg) as output format on the drop-down menu. 
Tip: In case the default settings do not fit your requirement, you can click "Settings" button and enter "Profile Settings" panel to adjust video size, bit rate, frame rate, sample rate and audio channels.
Step 3. Start MTS conversion with a click
Simply click the "Convert" button to start converting MTS for Sony Movie Studio and everything else will be automated.
After the process completes, click "Open" button to find the generated videos. Now, it's much easy for you to import Sony a7s AVCHD files to Sony Movie Studio 10/11/12/13 for further editing.
Additional Tips:
If you also wanna convert Sony a7s XAVC S video files on Edius, Sony Vegas Pro, Adobe Premiere Pro , iMovie, FCP... you can apply this professional all-in-one tool Brorsoft iMedia Converter for Mac or Brorsoft Video Converter Ultimate for Windows.
If you have problems when importing or editing your Canon, Sony, Panasonic etc, camera video files, you can check out “Brorsoft Camcorder/Camera Importing Tips" or "FCE, FCP, iMovie Column"to get your solutions. 
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