I don't know if this is helpful, but in case it is I used gst-inspect on the two provided custom elements in case it is helpful. I don't know what to do with it, but I had hoped it might give a clue either to what stream format the mixersink expect, or if it is flexible how to specify what input we are passing to it. I had hoped that the audible source details might allow me to use something like:
gst-launch audiblesrc {options} ! mixersink {options}
If this would work then perhaps there would be a way to pull the stream description from the source to the sink. Unfortunately there is a reference to an authentication file in audiblesrc, so unless someone knows where that hides this isn't possible.
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