Greetings ! I am getting an assertion failure. I am writing in the hope that this is a well known issue and you can point me in the right direction. The problem happens when I do a "switch" on an input-selector element and the aravissrc becomes the new active pad. Thanks much, Bert Douglas ------------------------------------------------------------------------------------------ (panocam5.py:10442): GStreamer-CRITICAL **: gst_segment_set_newsegment_full: assertion `segment->format == format' failed (panocam5.py:10442): GStreamer-CRITICAL **: gst_segment_set_newsegment_full: assertion `segment->format == format' failed (panocam5.py:10442): GStreamer-CRITICAL **: gst_segment_set_newsegment_full: assertion `segment->format == format' failed (panocam5.py:10442): GStreamer-CRITICAL **: gst_segment_set_newsegment_full: assertion `segment->format == format' failed Error: Internal GStreamer error: negotiation problem. Please file a bug at <a href="http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer">http://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer</a>. xvimagesink.c(2251): gst_xvimagesink_setcaps (): /GstPipeline:pipeline0/GstXvImageSink:xdisplay-pz: Error calculating the output display ratio of the video. Error: GStreamer encountered a general stream error. gstbasesrc.c(2562): gst_base_src_loop (): /GstPipeline:pipeline0/GstAravis:src1: streaming task paused, reason not-negotiated (-4)