Anybody use softdevice and mplayer plugins?

I use spdif out for audio, and have trouble.

softdevice have: -vo dfb:mgatv -ao alsa:pcm=plug:spdif#ac3=plug:spdif#

mplayer.sh: AO="alsa:device=spdif"

mplayer work without vdr, but than I use mplayer-plugin, I can see video, but no audio from mplayer.

[AO_ALSA] Unable to set hw-parameters: Device or resource busy
Failed to initialize audio driver 'alsa:device=spdif'
Could not open/initialize audio device -> no sound.
Audio: no sound

I think softdevice takes resources and does not give them to mplayer

I use 2.6.24 kernel on Ubuntu 8.04, alsa-1.0.15, softdevice from cvs, mplayer from svn, vdr-1.6.2 and vdr-1.7.4

Any suggestios?