This is done on purpose by faad.
When parametric stereo (a codec tool in HE-AAC v2 which downmixes a
stereo source into a mono stream) is implicitly signaled, a mono stream
may later transform into a stereo stream after initialization, and from
what I could see in the faad sources, this has been known to cause
applications trouble, so faad initializes stereo unconditionally as a
convenience to those users.
It's an unfortunate tradeoff, but I defer to upstreams' experience for
choosing it. I will close this as Invalid, since this is not a bug on
the Ubuntu side.
** Changed in: faad2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/290259
Title:
faad_2.6.1-2_i386.deb does not handle mono audio
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