View and record dvb at the same time

Hi folks,

i have a little problem with mplayer and dvb viewing/recording. I want 
to view and record with mplayer at the same time.
I have two dvb tuner configured (Adapter 0 and 1) and want to play with 
one mplayer a program and with a second mplayer record another program.
When i start the second mplayer session, the first one freezes. Is there 
any configuration, that i forgott ?

Thank you very much.

Volker