play audio via Rygel to USB sound card

[Soho Soho123 <soho123 2012 gmail com>]

Dear Jens,

I got a error when I try to play audio via Rygel to usb sound card.
but when I try to play by gst-launch, it is OK,
the pipeline is :
gst-launch-0.10 -v filesrc location=/bin/audio_src_48k_le.wav !
wavparse ! audioconvert ! alsasink device="hw:0,0"

it get not-linked error when playing audio from media server via Rygel
to USB sound card,
Do you have any idea?

thanks!
Soho

(rygel:881): Playbin-DEBUG: rygel-playbin-player.vala:75: Changing playback
state to PLAYING.
(rygel:881): Rygel-DEBUG: rygel-changelog.vala:74: 'TransportState = PLAYING'
logged
(rygel:881): Rygel-DEBUG: rygel-changelog.vala:55: LastChange sent
(rygel:881): Playbin-WARNING **: rygel-playbin-player.vala:218: Error from
GStreamer element playbin20: gstbasesrc.c(2625): gst_base_src_loop ():
/GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstSoupHTTPSrc:source:
streaming task paused, reason not-linked (-1)
(rygel:881): Playbin-WARNING **: rygel-playbin-player.vala:221: Going to
STOPPED state