How to Import MTS to iPhone 4S
MTS is a file extension of AVCHD, i.e. Advanced Video Codec High Definition, specially created for HD camcorders. This file format is joint developed by Sony and Panasonic, and now many HD camcorders shoot video as this format such as Canon(HF10/HF11/HF200 etc), JVC,Sony, Panasonic (HDC-HS200/DMC-GH1 etc).
MTS is a pretty new HD video format now and therefore many devices including iPhone 4S do not support this file, if you need to play such file on iPhone 4S, you need a Video Converter to convert the MTS to the format that iPhone 4S support. According to the specs of iPhone 4S from the Apple's official website, the video it can support includes:

H.264 video up to 1080p, 30 frames per second, High Profile level 4.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
MPEG-4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format
So if you want to import MTS file to iPhone 4S, you'd better convert the it to MP4 or H.264. iOrgsoft AVCHD Converter is a professional software to convert AVCHD .mts, .m2ts video file to popular video formats such as mp4, wmv, avi etc, easy to use and produce high quality video. This step-by-step guide will show you how to convert/import MTS to iPhone 4S.
Step 1: Download and install AVCHD Converter on your computer, run it.
Step 2: import AVCHD file and set output format, output path
Click the Add File button to import AVCHD video file from your HD camcorder, the set output format and output path as below.

Tip: AVCHD Converter can help you to create your personalized video by the clipping(split the video into several segments, set aspect ratio) ,editing(crop video, apply effect to video)


Step 3: setting
You need to finish the setting below before convert the video file especially the resolusion.

Step 4: Convert
After all steps have been finished, click the Convert button to start convert. A progressing bar will show you the converting status on the AVCHD Converter.

