Anyone know how to do a "timed program" with mplayer?

[Adam Funk <a24061@yahoo.com>]

I can listen to a continuously ogg-streaming radio station with this
command:

mplayer http://engine.collegemedia.vt.edu:8000/wuvt.ogg

and I've successfully recorded (using scripts and at) fixed-duration
RealPlayer radio shows to .wav to listen to them later.  But I'd like to
record a specific show tonight from the continuous live ogg stream.

I suppose I could set up an at job to start recording at 18:30 and another
to "killall mplayer" at 20:00, but I think that might cause problems (and
it's hideously inelegant).

Is there a better way?