Previously on rec.arts.sf.tv.babylon5.moderated, Chris Adams said:

> Also, a box can't necessarily tell what the best signal is for the
> output device.  I have multiple TVs (HD and SD) hooked up to one TiVo
> for example; sometimes the "best" channel is determined by
which TV I'm
> watching.

That is actually quite simple:  Go by the output cable being used.  The
box can tell which one is being used, and HDMI, at least, talks back to
report the capabilities of the display device.  I know, because without
making any changes to the settings on my cable box, it autodetected the
resolution abilities of my Toshiba Regza when I upgraded from a
mumble-year old SD set - and won't let me override them.

ANT, Composite or S-Video, use SD channels/output.  Component or HDMI,
use HD channels/output.  Overrideable by the user, of course.  Both to
overcome the stupid stretch-to-fit that some HD channels do, and also
to allow the user to watch the HD on SD sets if their box can
downconvert.  Which is what I was doing before, btw.

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