I recently treated myself to a HD camcorder as I will be going on holiday to California soon. I got the camcorder a bit early so I could have a chance to play around with it and practice editing the clips, the camcorder records the clips in a .MTS format which is a High-definition MPEG Transport Stream video format, commonly called “AVCHD;” used by Sony, Panasonic, and other HD camcorders; based on the MPEG-2 transport stream and supports 720p and 1080i HD video formats.
If you've got some MTS videos and want to convert MTS to MP4 videos, you need a Mac HD video converter tool like iFunia HD Video Converter for Mac to convert MTS to MP4 video. This program can easily convert MTS HD video to MP4 videos!
MPEG-4 is a multimedia container format which is most commonly used to store digital audio and digital video streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The official filename extension for MPEG-4 files is .mp4, thus the container format is often referred to simply as MP4.

Step 1: Download and install Mac MTS to MP4 Converter to convert MTS to MP4 videos
We’ll be using a very nice HD video converter software for Mac OS called ‘iFunia MTS to MP4 Converter for Mac’ for converting MTS/ M2TS HD video, head over here and download the free trial version. Next step is to install the program.
Step 2: Run iFunia MTS to MP4 Converter for Mac and add MTS video files
Now run iFunia MTS to MP4 Converter on your Mac and click the big button "Add..." to add MTS/M2TS HD video files, you may add as many videos as you want to convert to MP4 videos.
Step 3: Select the video titles that you'd like to convert
Only the titles you checked will be converted. So if there're some videos you don't want to convert, you need to uncheck them or 'Remove' them from the right-click menu. 'Clear' in the right-click menu means remove all titles in the list.

Step 4: Edit videos: crop, trim, add effects, add watermark
Wanna edit your videos to make it more personalized? You may add a watermark in iFunia MTS to MP4 video converter for Mac. Just select the title you'd like to add watermark, then click the button 'Edit' to launch video editing window. If you want to crop video or add some special effects, click the first two tabs.
You're able to add a text watermark or an image watermark (you may call it logo) on the output video. Adjust the 'Transparency' to make the watermark look better.

Step 5: Merge some separate videos to 1 single file
Click on the video titles you'd like to merge to 1 single file, then click 'Merge' button and uncheck the former separate files if you just need the single merged video file. Here 'click on the video titles' is not just check the options, you need to click them to make them highlight. You may see the image below to have an idea.

Step 6: Change the output settings to convert videos with best quality
There are almost all common video formats available for you to choose to convert to. You may convert MTS/M2TS HD video to different video formats for video editing or playback on your mobile devices, such as iPod, iPhone, PSP, cellphone, etc.
MP4 file format is supported by most media player and mobile devices, like iPod/iPhone/PSP. Remember that the output file size mostly depends on the Bitrate you set. Larger Bitrate, larger file size. Actually video with bitrate as 768 is acceptable for watching.
Step 7: Start converting MTS to MP4 video
Now you may click the big button "Start" to begin converting HD videos to MP4 video. Once the convert is complete, iFunia MTS to MP4 Video Converter for Mac will place a new version of your video. Double-click the new MP4 file and play it to make sure it looks as you expect.
MTS to MP4 Video Converter for Mac is the best mac MTS to MP4 video converter software to convert HD videos (MTS/ M2TS/ MOD file format) to any other video formats. You may use iFunia HD Video Converter for Mac to convert MTS/M2TS videos to AVI/ MOV/ MP4/ WMV/ MPEG file for playback in media players and mobile devices.