Hi Brian,
I'm not so familiar with Incoder so I don't know the specifics of that tool.
But I think we can compare it with the XPression Video Coder where you also manually have the install the codecs that can be used by Video Coder because the software itself does not install any codecs.
Sp you have to install yourself the Quicktime and DNxHD-codecs in order to use them in Video Coder, so I would not be surprised if it's the same for Incoder.
But I could be wrong ofcourse...
#XPression