$ gst-launch playbin2 uri=rtsp://cam/h264
Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstURIDecodeBin:uridecodebin0/GstRTSPSrc:source: Could not read from resource.
Additional debug info:
gstrtspsrc.c(4193): gst_rtspsrc_try_send (): /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstRTSPSrc:source:
Could not receive message. (Parse error)
Setting pipeline to NULL ...

(gst-launch-0.10:12620): GStreamer-WARNING **: Element udpsrc3 is not in bin source

(gst-launch-0.10:12620): GStreamer-WARNING **: Element udpsrc4 is not in bin source
Freeing pipeline ...
$