Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Not easily, the only way I can think of is using a brute force method such as a screen recording utility (snapz pro) then export using quicktime.

Realplayer videos usually stink anyway, if possible try to get a better quality original.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.