Swapping Channels with Audioconvert's mix-matrix

[Mariano Koremblum]

I managed to "solve it". This issue is related with this:
https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/issues/521

Apparently it does not work when from N input channels you mix with this
property to N output channels. So, two workarounds are:

1) You add one dummy output channel to the stream ( N to N+1)
2) You add one dummy output channel to the stream and then remove it ( N to
N+1 and then N+1 to N)



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