I think I remember someone lamenting not being able to capture .rm movies and such. Here is how I do so. (Using Gadwin PrintScreen 3.1 which you can DL at
http://www.gadwin.com/printscreen/ )
*Make sure in Gadwin 3.1 under the 'source' tab that you have 'Full Screen' checked.
*Make sure that you disable 'overlays' in realplayer tools-prefrences. (See picture below.)
*Pause at the frame you wish to capture
*Enter 'full screen theatre' mode
*press 'Print Scrn' on your keyboard.
This should do it. I only use WMP and Real Player, but hopefully this basic principle should work across the board.
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Because I am of it, not above it.