gstreamer problem

# GET AUDIO
gst-launch-0.10 \
alsasrc device="plughw:1,0" ! audio/x-raw-int ! queue ! \
audioconvert ! queue ! vorbisenc ! queue ! mux. \
oggmux name=mux ! filesink location=whatever.ogg

# works

# GET VIDEO
gst-launch-0.10 \
v4l2src device="/dev/video0" ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \
tee name=t_vid ! queue ! xvimagesink sync=false t_vid. ! queue ! videorate ! \
'video/x-raw-yuv,framerate=30/1' ! theoraenc ! queue ! mux. \
oggmux name=mux ! filesink location=whatever.ogg

# also works

# GET AUDIO AND VIDEO
gst-launch-0.10 \
alsasrc device="plughw:1,0" ! audio/x-raw-int ! queue ! \
audioconvert ! queue ! vorbisenc ! queue ! mux. \
v4l2src device="/dev/video0" ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \
tee name=t_vid ! queue ! xvimagesink sync=false t_vid. ! queue ! videorate ! \
'video/x-raw-yuv,framerate=30/1' ! theoraenc ! queue ! mux. \
oggmux name=mux ! filesink location=whatever.ogg

# fails with 
Setting pipeline to PAUSED ...
libv4l2: error setting pixformat: Input/output error
Pipeline is live and does not need PREROLL ...
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device '/dev/video0' cannot capture at 640x480
Additional debug info:
gstv4l2object.c(1920): gst_v4l2_object_set_format (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Call to S_FMT failed for YU12 @ 640x480: Input/output error
ERROR: pipeline doesn't want to preroll.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...