[Bug 761489] matroskademux: fails to parse opus ('audio/x-unknown, codec-id=(string)A_OPUS')

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761489

--- Comment #23 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
(In reply to Sebastian Dröge (slomo) from comment #19)
> Comment on attachment 320452 [details] [review]
> Fix opus negotiation with mono streams
> 
> This breaks the case where downstream only accepts mono (or stereo), and the
> stream is stereo (or mono). We supported this conversion before.
> 
> This needs to be a bit more clever.

How did this work, and do you have a particular test case for this ?
If I remove the patch, this still does not work:

gst-launch-1.0 audiotestsrc ! audio/x-raw,channels=1 ! opusenc ! opusdec !
audio/x-raw,channels=2 ! autoaudiosink

I want to understand what is/are the case(s) that used work before I
modify/test.

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