Detelecining
When using HandBrake, you most likely want to enable detelecining to restore content to it's “original” framerate.
As a personal matter, I only care about deinterlacing, and don't worry about the framerate.
Some great information as to why is found here on MPlayer's documentation wiki: http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-telecine.html
HandBrakeCLI -i /dev/sr0 --detelecine -o dvd_track.mkv