[g545952@localhost ~]$  gst-launch -v  v4lsrc ! xvimagesink

(gst-launch-0.10:10132): GLib-GObject-WARNING **: cannot register existing type
`GstRTPBin'

(gst-launch-0.10:10132): GStreamer-CRITICAL **: gst_element_register: assertion
`g_type_is_a (type, GST_TYPE_ELEMENT)' failed

(gst-launch-0.10:10132): GLib-GObject-WARNING **: cannot register existing type                                                            `GstRTPJitterBuffer'

(gst-launch-0.10:10132): GStreamer-CRITICAL **: gst_element_register: assertion                                                            `g_type_is_a (type, GST_TYPE_ELEMENT)' failed
Setting pipeline to PAUSED ...
/pipeline0/v4lsrc0.src: caps = video/x-raw-yuv, format=(fourcc)I420, width=(int)                                                           160, height=(int)120, framerate=(fraction)75/16
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
/pipeline0/xvimagesink0.sink: caps = video/x-raw-yuv, format=(fourcc)I420, width                                                           =(int)160, height=(int)120, framerate=(fraction)75/16