Trouble converting from working gst-launch-0.10 to gst-launch-1.0

[Leon]

Hi all,

I'm having trouble converting a running launch from 0.10 to 1.0 and 
would really appreciate any help I can get.
I'm compositing IP camera streams to display. Works fine on 0.10 but 
nothing displays on 1.0.
There are no errors, just seems to 'hang'.

The working 0.10 launch is:

gst-launch-0.10 -ev videomixer name=mix ! ffmpegcolorspace ! xvimagesink \
rtspsrc location=rtsp://192.168.1.212:554 ! decodebin2 ! videoscale ! 
video/x-raw-yuv,framerate=30/1,width=640,height=360 ! \
textoverlay font-desc="Sans 10" text="CAM1" valign=top halign=left 
shaded-background=true ! \
clockoverlay time-format="%d/%m/%Y %H:%M:%S" font-desc="Sans 8" 
valign=bottom halign=left shaded-background=false ! \
videobox border-alpha=0 top=0 left=0 ! mix. \
rtspsrc location=rtsp://192.168.1.211:554 ! decodebin2 ! videoscale ! 
video/x-raw-yuv,framerate=30/1,width=640,height=360 ! \
textoverlay font-desc="Sans 10" text="CAM2" valign=top halign=left 
shaded-background=true ! \
clockoverlay time-format="%d/%m/%Y %H:%M:%S" font-desc="Sans 8" 
valign=bottom halign=left shaded-background=false ! \
videobox border-alpha=0 top=0 left=-640 ! mix.

and the 1.0 launch is:

gst-launch-1.0 -ev videomixer name=mix ! videoconvert ! xvimagesink \
rtspsrc location=rtsp://192.168.1.212:554 ! decodebin ! videoscale ! 
video/x-raw,framerate=30/1,width=640,height=360 ! \
textoverlay font-desc="Sans 10" text="CAM1" valignment=top 
halignment=left shaded-background=true ! \
clockoverlay time-format="%d/%m/%Y %H:%M:%S" font-desc="Sans 8" 
valignment=bottom halignment=left shaded-background=false ! \
videobox border-alpha=0 top=0 left=0 ! mix. \
rtspsrc location=rtsp://192.168.1.211:554 ! decodebin ! videoscale ! 
video/x-raw,framerate=30/1,width=640,height=360 ! \
textoverlay font-desc="Sans 10" text="CAM2" valignment=top 
halignment=left shaded-background=true ! \
clockoverlay time-format="%d/%m/%Y %H:%M:%S" font-desc="Sans 8" 
valignment=bottom halignment=left shaded-background=false ! \
videobox border-alpha=0 top=0 left=-640 ! mix.

I then tried a simpler launch in both as well, and:

this works:
gst-launch -e rtspsrc location=rtsp://192.168.1.212:554 ! decodebin2 ! 
videoscale ! video/x-raw-yuv,framerate=30/1,width=640,height=360 ! 
ffmpegcolorspace ! xvimagesink

but this doesn't:
gst-launch-1.0 -e rtspsrc location=rtsp://192.168.1.212:554 ! decodebin 
! videoscale ! video/x-raw,framerate=30/1,width=640,height=360 ! 
videoconvert ! xvimagesink


Kubuntu 12.04 (LTS)
uname -a
Linux leon 3.2.0-49-generic #75-Ubuntu SMP Tue Jun 18 17:39:32 UTC 2013 
x86_64 x86_64 x86_64 GNU/Linux

GStreamer-1.0 installed from ppa:gstreamer-developers/ppa

Thanks in advance, any help much appreciated.

Leon