Fallbackswitch : erroneous pipeline: could not link videotestsrc0 to s
I have two Gstreamer pipelines that work separately:
gst-launch-1.0 nvarguscamerasrc sensor-id=0 ! "video/x-raw(memory:NVMM),width=1920,height=1080,framerate=30/1" ! nvvidconv ! video/x-raw ! ximagesink
and
gst-launch-1.0 videotestsrc ! ximagesink
But when I join them together with fallbackswitch like:
gst-launch-1.0 nvarguscamerasrc sensor-id=0 ! "video/x-raw(memory:NVMM),width=1920,height=1080,framerate=30/1" ! nvvidconv ! video/x-raw ! fallbackswitch name=s ! ximagesink videotestsrc ! s.fallback_sink
I get the following error message:
WARNING: erroneous pipeline: could not link videotestsrc0 to s
Any idea why this does not work ? Regards.