[mythtv] [mythtv-commits] Ticket #1866: DVB Scanning - Remaining Issues

Stuart Auchterlonie stuarta at squashedfrog.net
Tue Aug 22 09:08:07 UTC 2006

On Mon, Aug 21, 2006 at 08:19:12PM +0200, Rudy Zijlstra wrote:
> >
> >>And please, please, do ignore NIT while you are doing this?? Because 
> >>many cable operators do not provide a valid NIT-actual. They provide
> >>many NIT-Other, but no, or no valid NIT-actual.....
> >>    
> >>
> >
> >This is something I personally don't get. I can understand that a NIT 
> >becomes invalid after time if nobody maintains it. But I don't see the 
> >point in transmitting a NIT_other in cable natworks. It isn't a useful 
> >information at all.
> >  
> >
> It is, if you have a different frequency layout in different area's, and 
> only 1 HE. Or clearly less Head-Ends than area's. In that case the 
> NIT-Other describes the area frequency layout *for a specific area*, and 
> NIT-Actual is worthless. You use the network ID to select the correct 
> NIT-Other for your area. If you are willing to use the NIT-Other 
> information, better algo's are possible. But you need to know a bit 
> about the network you are installing on. Often the NIT-Other will also 
> tell you the area it is valid for, in the network description.

Okay, this is doable, but is going to require some thought on
the best way of implementing it.

I suspect the cleanest way of implementing this will be to
expand the list of locations in the country list, and then
behind the scenes encode in the exceptions to what we are
looking for.

In this case
German Cable { require SDT = yes, require NIT = no }

plus whatever we need in terms of the frequency list to


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