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[David Röthlisberger]

On 7 Jan 2013, at 09:17, Ian Davidson wrote:
> 
> Hi Kris,
> 
> You are correct when you say that you did not explain why my program didn't work - but I tried your advice and now have 2 programs which don't work.
> 
> I use a gst_parse_launch, passing it a string such as 
> "v4l2src norm=PAL ! videorate ! 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1' ! queue ! mux. alsasrc ! audioconvert ! 'audio/x-raw,rate=44100,channels=2' ! queue ! mux. avimux name=mux ! filesink location=file.avi"
> but when I run the program I get a message
> GStreamer-CRITICAL **: gst_element_make_from_uri: assertion `gst_uri_is_valid (uri)' failed

Have you tried removing the single-quotes? When you pass that to gst-launch on the command line, the shell will have stripped the quotes off, so what gst-launch saw isn't the same as what you are passing to gst_parse_launch.