GStreamer error “assertion 'GST_IS_ELEMENT (src)' failed” when linking elements

Question

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 ! auto         


        

Answer 1

If the element is not added with the pipeline, then this error will occur. Ensure that the problematic element is added with the pipeline.

Answer 2

I figured out the problem, I was linking the dynamically-created pad incorrectly:

src.link(dest)

Should have been:

pad.link(dest.get_compatible_pad(pad, None))