MTS

Files that contain the .mts file extension are AVCHD video files. AVCHD is an acronym for Advanced Video Codec High Definition. These MTS files contain high-def MPEG transport stream videos that have been captured by certain video camcorders. MTS files containing high-def video streams and can support both the 720p and 1080i HD video formats. The files can be played back on a user's computer using a variety of software applications including the Windows Media Player.

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3GP

3GP is defined in the ETSI 3GPP technical specification.[1] 3GP is a required file format for video and associated speech/audio media types and timed text in ETSI 3GPP technical specifications for IP Multimedia Subsystem (IMS), Multimedia Messaging Service (MMS), Multimedia Broadcast/Multicast Service (MBMS) and Transparent end-to-end Packet-switched Streaming Service (PSS).3G2 is defined in the 3GPP2 technical specification.

- - Wikimedia

Step-By-Step to Convert MTS to 3GP

Interface

Step 1. Download and install the program, then double click it to run it, and then you'll see the main interface of the program.

Load Files

Step 2. Click "Add File(s)" button. Here you can select "Add Video" or "Add Folder" button to add files as you like.

Profile

Step 3. Click the drop-down arrow right beside the "Profile" column and select your desired video format from the drop-down list.

Edit

Step 4. Click "Edit" button to customize the output video like Effect, Trim, Crop, 3D Settings and Watermark.

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