recording in mono

[lunix]

vlc mms://citadelcc-KGO-AM.wm.llnwd.net/citadelcc_KGO_AM --sout '#transcode{ab=32,aenc=vorbis,channels=1}:standard{access=file,mux=ogg,dst="/tmp/brinker.ogg"}' -d

The above is my command line which works. It doesn't seem to matter if I use
channels=1 or channels=2 I still get stereo reported where the incoming stream
is only mono.

How do I set the above line to only record mono?
I did notice a "--mono" option but I couldn't get it to work.

If setting the stream in record mode to mono won't result in a smaller resultant
file size then I don't care.

Any suggestions?