GStreamer error “assertion 'GST_IS_ELEMENT (src)' failed” when linking elements
I'm working on a GStreamer-based program using Python and the GObject introspection bindings. I'm trying to build this pipeline: videomixer name=mix ! autovideosink \ uridecodebin uri=v4l2:///dev/video0 ! mix. The pipeline works perfectly using gst-launch-1.0, but my Python program gives the errors: (minimal.py:12168): GStreamer-CRITICAL **: gst_element_link_pads_full: assertion 'GST_IS_ELEMENT (src)' failed on_error(): (GError('Internal data flow error.',), 'gstbasesrc.c(2865): gst_base_src_loop (): /GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0/GstV4l2Src:source:\nstreaming task paused