use a pipe to mplayer, does not work

opens one frame or so then shows error message about wrong data
something, *and hangs* (waiting for stdin to close probably), that's
why no error message is displayed from videorecorder, fun.
two fixes: typo (hu), and no -slave for mplayer

todo: why was there no exception shown??

Also, messes up the terminal settings now.
prevent mplayer from messing up terminal
cleanup