Render Speed Up? 7 hours or more for render MTS to MP4... (Ubuntu Studio 12.10)

Hi!

I'm trying to reduce the time that my videos are created. There are a method to speed up renders???
My current profile:

"/usr/bin/melt" "/tmp/kde-jordiMFuSFg/kdenlivefB2247.mlt -profile atsc_1080p_50 -consumer avformat:/home/jordi/Diània.tv/BARXETA/Bilbeny/JordiBilbeny.mp4 progress=1 f=mp4 hq=1 acodec=aac ab=192k ar=48000 pix_fmt=yuv420p vcodec=libx264 minrate=0 vb=6000k g=250 bf=3 b_strategy=1 subcmp=2 cmp=2 coder=1 flags=+loop flags2=dct8x8 qmax=51 subq=7 qmin=10 qcomp=0.6 qdiff=4 trellis=1 aspect=@16/9 threads=1 real_time=-1"

Is a Project with MTS files (Canon HF G10), Titles, Flac Audio file... But the Speed is slowwww...
:(

I'm catalan. Sorry for my english! :)