problem with ffmpeg and webcam

Hi everybody,
I'm a new ffmpeg and ffserver user.
I've a problem whith ffmpeg: my video are fine, but there's no audio.
I use a webcam video device, but sound is not grabbed by the webcam.
I'm running a 2.6.11-1.1369_FC4 kernel
does anybody know anything about that?

this is the command i run when generating video.
ffmpeg -vd /dev/video0 -ad /dev/audio1 -b 128 -r 15 -s 352x240 -target
film-vcd /home/share/appo2.mpg

thank's a lot.