Avidemux for Mac OS X

For the conversion of MTS files to MP4 you can use the free software Avidemux.

http://avidemux.sourceforge.net/download.html

Using this software you are able to join video files and convert to MP4 in one session.

File – Open: the first MTS-file

File – Append: the second MTS-file

and so on

For MP4 output we suggest:

1. In the Video dropdown list on the top left: select MPEG-4 AVC
2. Click [Configure] button, a new x264 configuration window opens up. Go to Rate Control. Move the scroll bar at the bottom to the left: 0 (High Quality). Select Average Bitrate (Two Pass) from the dropdown list and set the Average Bitrate to at least: 10000
3. Click OK in the button of the screen to close the window
4. In the Audio dropdown list: select MP3 (lame)
5. Click on [Filters] button and set Resampling at 48000 then click OK
6. In the Format dropdown list: select MP4

Now save the file by File – Save  – Save Video and type a file name with the extension *.mp4

Bear in mind that you need a powerful computer to do the encoding.

You could experiment with the Average Bitrate; a higher value means better quality