[mythtv-users] how properly to rescan channels

Sun Jul 12 19:47:13 UTC 2015

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Hoi UB40D,

Sunday, July 12, 2015, 9:06:29 PM, you wrote:

> MIKE:
> Yep. Deleting all capture cards won't help. Once you have correctly

>> defined your cards you shouldn't need to touch that menu option again.
>>> You must delete all video sources.
>>
>>
> I have now done that.

>> Where you got the EIT entry I don't
>>> know, since I have never seen that on the sources screen and it wouldn't
>>> make sense anyway.
>>>
>>
> It was my user-defined name for it. As for "wouldn't make sense", well, it
> was the only thing that made sense to me, given that the first editable
> field besides the user-defined video source name was "listings grabber",
> for which my choice was EIT, and none of the other available fields said
> anything very interesting.

> What is an example of a video source name that would make more sense?

Anything that makes sense to you. But EIT is normally reserved for
program info transmitted with the channel

>>> A video source is the link between your capture card(s) and your list of
>>> channels.
>>
>>
> Hmmm... from the way things are presented in the setup, before hearing you
> speak I would have said these are the 5.input connections, not 4.video
> sources.

Both right. The channel definitions and program info is linked to the
video source and the video source is through input connections linked
to the hardware. But the tuning info is through the channels in the
video source.
The logic is that while the tuning of course is done with the
hardware, it is possible that you can reach multiple sources through
one tuner and that you can reach one source through multiple tuners.
So the cards represent hardware and the video sources the logic of
where and what, which link through the input connections.

>> It defines which channels are available and how you acquire
>>> them ie in your case tune them. (Other "capture cards" may in fact be
>>> Internet feeds or other methods of supplying input.)
>>>
>>
> I am not sure I see how the fields in the video source screen say anything
> about how to tune to the channels.

Not directly. The channels contain that info and they are contained in a
video source, which needs the hardware through the input connection to
do the actual tuning.

>>
>>> Because of this the video source also defines the channels you can
>>> receive using the cards associated with it. That's why the scan options
>>> are under the source menu item,
>>
>>
> I am really puzzled now.
> Under the video source menu item I do NOT have an option to scan anything.
> I do, however, have such an option in the 5.input connections screen.

> Are we talking at cross purposes?

No the scan option is in the input connection screen, but is part of
the video source linked in there.

> I do not presume to know the "correct" names for things, but I am reading
> what I see in the backend setup program.

> but certainly for DVB-T you can also do
>>> scans from within the channel editor screen. You may get more options
>>> that way.
>>>
>>
> If I do the scan from the channel editor, the screen I get to looks the
> same to me.

It is

>>
>>> As I mentioned EIT is just a method of providing program info and is
>>> available on *all* transmission methods, except analog which is mostly
>>> obsolete anyway.
>>>
>>> Oh, and remember that not all channels transmit 24/7. Some like CBBC and
>>> BBC3, BBC4 are part-time, which means that any scan may happen in a
>>> period when they are off-air. This can cause fun when scheduling
>>> subsequently...
>>>
>>>
> What should I do about that? First check that BBC4 is transmitting and then
> scan?

> Anyway:
> this pm I deleted all video sources, redid the scan for both dvb-s and
> dvb-s2, and again I get several instances of each "channel" (in the tv
> sense, as in ITV HD), though apparently on different "channels" (in the
> satellite number sense, as in 20010).

> If the satellite does offer several copies of, say, ITV HD on
> differently-numbered "channels" then I admit it kind of makes sense for
> myth to show them all as distinct items. On the other hand I would expect
> not to be the only person to have experienced that, and I would imagine
> it'd make sense for Myth also to have an option to collapse such duplicates
> into one (I mean all the "channels" with the same human-readable name, even
> if they have a different "channel" number).

I quote myself:
"You're right Mike and I can add to this something that came up one or
two month ago. Correct me if I'm not exactly right.

If you want MythTV to see two channels in different sources as one,
give them the same callsign. If you also want them to show up as one
in your EPG give them the same Channel Number"

> JOHN:

>  I've been keeping quiet because of my lack of DVB-S experience, but
>> deleting ALL capture cards has been recommended almost ad nauseam here to
>> remove channels that won't otherwise go away;  perhaps it's only essential
>> if you have several hostnames.

> By now I've deleted all cards AND all sources...

>> And AFAIR the name of the video source is user-defined and essentially
>> arbitrary, so EIT ought to be valid purely as a mnemonic.

> That's what I had.

>> But you would need more source names if you had say two dishes or two
>> polarisations.
>>

> I think I kind of get it.

>> Do the multiple channel numbers define regional variations?
>>

> Some of them may (but then they are labelled as such, e.g. BBC 2 Wales...)
> but here I am talking of several channels with distinct numbers but
> identical human-readable name.

>>
>> The options on exit from Mythtvsetup might be better as:
>>
>> 'Would you like to re-edit your settings?'
>>
>> 'Yes' / 'No, try them as they are'
>>
>>  with optional extra civility.

> Yes, that would be more in tune with what the options actually do.

Tot mails,
  Hika                            mailto:hikavdh at gmail.com

"Zonder hoop kun je niet leven
Zonder leven is er geen hoop
Het eeuwige dilemma
Zeker als je hoop moet vernietigen om te kunnen overleven!"

De lerende Mens