[mythtv] IVTV VBI reading

[Robin Gilks]

> It may be cached in the driver (we don't explicitly _disable_ vbi
> encapsulation if it's set to None), or they just run that thread all the
> time.
>
> Isaac

I can confirm that unloading and reloading the ivtv driver stops the
vbi-enc process from coming alive.

BTW - is it reasonable to look for VBI data from the s-video or composite
input of a pvr150/500 card? Perhaps just turn VBI on when a channel on a
tuner input is selected?

-- 
Robin Gilks