playing dvds with mplayer

identify subtitles and audio tracks:
mplayer -dvd-device mnt -vo null -ao null -frames 0 -identify dvd://1

deinterlace-post-processing and subtitles at the bottom:
mplayer -dvd-device mnt -vf pp=l5,expand=0:-50 -sid 0 -spualign 2 dvd://1