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The G722 payload only accepts G722 audio with channels=1, so it must specify the encoding-params=1 in its src caps, otherwise it causes issues with farstream which thinks it supports 2 channels G722 and when confronted with a remote that has G722/8000/2, it will negotiate it and error out with a not-negotiated when the caps don't intersect at runtime. https://bugzilla.gnome.org/show_bug.cgi?id=789878
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