First, sorry from my English. I'm Catalan !!*!! :)
My battle for rendering best with less time. This is for make a DVD with DEVEDE later... :)
1. First, install "ffmbc" http://www.videohelp.com/tools/ffmbc
sudo make install
2. Second, convert MTS file to an ULTRA QUALITY MP4:
ffmbc -i input.mts -vcodec copy -acodec aac -ab 512k -strict experimental output.mp4
3. Create your Project with the MP4 file (of course!). When you are going to Render, put the same bitrate that are at the "Propierties" of your MP4 File!