[Cin] audio opts files

[Phyllis Smith]

Andrew: will add the 2 audio later today to GIT and "yes" moving avi.xvid
to xvid.avi.  All tested good here.

Those fix xvid 'type' audio enable for me (BT327), and also add avi pcm/mp3
> audio encoding ...
> Probably xvid subtype can be moved to more generic avi type now?
>
> Will add the 2 audio later today to GIT and "yes" moving avi.xvid to
xvid.avi is much better.  All tested good here.
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