It works. The alsa device is an on-board audio codec that has input and
output. I didn't test the audio by listening to anything, but the debug
output shows that it is in the PLAYING state.
So far so good. Now I want to move on to a slightly more complicated
I decided to expand the above example to deinterleave the audio input and
interleave it back together again. There are examples of this e.g. given on
the interleave element reference page. Here is the pipeline: