[mythtv-users] how properly to rescan channels

[UB40D]

On 11 July 2015 at 20:54, Hika van den Hoven <hikavdh at gmail.com> wrote:

> Hoi UB40D,
>
> Saturday, July 11, 2015, 9:49:45 PM, you wrote:
>
> >> Once a channel scan is successful, what else needs to be done to have
> the
>
> >> > channels entered in the database?
> >> > I don't recall ever doing anything special when I did this other
> times.
> >>
> >>
> >> Are the channels in the same video source you have linked to your
> >> hardware in input connections?
> >>
>
>
> > I don't claim ever to have understood this fully, but I thought they
> were.
>
> > 2.capture cards
> > I have two of those
> > /dev/dvb/adapterX/frontend0 for X in [0, 1]
>
> > 4. video sources
> > I have one of these
> > EIT
>
> > 5. input connections
> > I have two of those
> > [DVB: /dev/dvb/adapter0/frontend0] (dvbinput) -> EIT
> > [DVB: /dev/dvb/adapter1/frontend0] (dvbinput) -> EIT
>
> > When I did the channel scan, the "video source" field was EIT.
>
> > All this looks to me pretty much the same as when the system last worked.
>
> > Are they linked or not? If not, what else should I do?
>
> It looks like they are, but for some reason the channels don't show
> up. I suggest following John and Mike's suggestion. Start afresh!
> Remove all inputs and sources and recreate them from scratch. It will
> automatically remove any wrong setting causing this.
>
>
>

Yes, I agree this sounded like the way to go. Indeed I had already done
that at the time of writing the previous reply, and still channels weren't
showing up.

Now, another update--- some good news, bad news, and a bit more voodoo.

The main good news: I have got channels!
How did I get them?
Well, previously today I had done the scan only for dvb-s2, given that I
rarely watch the non-HD channels any more. The scan had worked, but no
channels had appeared in the listing. Now I did the scan also for dvb-s
(the non-HD ones) and, inexplicably, channels appeared. Including the HD
ones. So the problem is mostly solved (though it's unclear why). Thanks to
you, John and Mike all the same.

As for the bad news, and some extra voodoo: even though I restarted from
zero and did only one scan of HD and one scan of SD, most channels appear
multiple times (this happened before, and always unexplained). For example
right now, if I go in
Schedule recordings / search lists / films
one of the first listings is "Harry Potter Deathly Hallows Pt 1", at 20:00
on ITV+1, and it appears no less than TEN TIMES, apparently on different
channel numbers: 10021, 10031, 10055, 10101 etc etc. Does ITV+1 really
transmit on 10 different channels on the same satellite? Is there no way to
deduplicate without deleting hundreds of channels manually?
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