Hum, if I got it right, it is this way:
You can specify four different audio codecs in an audience file:
(A) presentationType audio-video, audio mode voice
(B) presentationType audio-video, audio mode music
(C) presentationType audio-only, audio mode voice
(D) presentationType audio-only, audio mode music
If you feed the producer with an audio-only file, it will choose (C) or (D), regarding the command line option "-am <voice|music>", else (A) or (B), and will encode no audio at all (even no silence), when the source file contains no audio (but will, if the source file contains a silent audio stream).
IIRC, if you provide an incomplete audience file to the producer, it won't encode anything, but cancel with an error message.
Or am I telling you nuts you already have in your pocket?
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