From cmdline.txt in the docs folder:
Command line parameters
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-fs Start in fullscreen mode
-ar=W:H Aspect ratio, ex.: -ar=16:9
-asx Start with x audio stream
x=1-> 1st audio stream
x=2-> 2nd audio stream
x=n-> n audio stream
-pan Pan-scan mode
-nsub Disable subtitles
-skin=SKIN Start with specified skin, ex.:-skin=Base
-res=WxHxDxF Startup resolution (W=width, H=height, D=color depth, F=Frequency), ex.: -res=800x600x32-80
-lang= Specify language, ex:. -lang=English
-eend Exit when movie is finished
-sdown Shutdown when movie is finished
-stime=x Start movie at x seconds
-deskmode Start in desktop mode
-hide Hide controls
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