This is off topic but since it worked very well on the sample vob, anyway, I used this to remove the line:

ConvertToYV12
turnleft()
descratch(minlen=702,asym=15,mindif=3,maxgap=3,blurlen=8,keep=0,border=0,maxangle=0,modeY=3,mark=false)
turnright()

The good thing is that it should not remove anything shorter than 702 pixels so your starfield is quite safe. I could not get a single detection error in the sample anyway, use mark=true for debug mode.

http://bag.hotmail.ru/descratch/descratch.dhtml