[mythtv] alternate inputs broken?

[Chris Palmer]

Isaac Richards wrote
> On Sunday 16 March 2003 06:46 am, Chris Palmer wrote:
> > Hmmm...  not sure your answer is what I was after.  What I meant by
> > inputs are: "TV", "Composite1", "SVideo", and "Composite3" (those are
> > the options for my tuner card).  Usually, hitting "C" allows you to
> > rotate thru the different input options, but it's not doing anything
> > for me, other than a short flicker as if it was trying to change mode.
> 
> His answer was exactly what you were after.  MythTV will no longer switch to 
> inputs that you don't have a channel source defined for (in setup).

ok... but they're not "channels"...  how is this structured now?
I am not understanding how I would setup channels for a non-tuner
video source.