[mythtv-users] Repack - Rescan question

[Allen Edwards]

On Tue, Mar 10, 2020 at 11:04 AM Klaas de Waal <klaas.de.waal at gmail.com>
wrote:

>
>
> On Tue, 10 Mar 2020 at 07:39, Klaas de Waal <klaas.de.waal at gmail.com>
> wrote:
>
>>
>>
>> On Tue, 10 Mar 2020 at 01:57, Allen Edwards <allen.p.edwards at gmail.com>
>> wrote:
>>
>>> I am trying to plan for the upcoming repack. I would like to do this
>>> with a minimum of "learning" new ways to do things. My basic question is
>>> can I scan a narrow range of frequencies in order to add a new channel to
>>> an existing lineup without that deleting the existing channels?
>>>
>>> Here is the background.  Right now a local station KTVU transmits on the
>>> old station, 44 and the repack station 31. Both come in great. It also
>>> transmits on 26 which comes in poorly as it is hitting the back of my
>>> antenna. There is another station, KGO that is moving from 7 to 12 that
>>> also transmits on 35 into the back of my antenna. Both the San Francisco
>>> versions that I can get and the San Jose versions that hit the back have
>>> the same call signs although they might have different xmltvids. What I
>>> recall from past times is that if Myth scans low to high, I end up with the
>>> wrong KGO and if it scans high to low I get the wrong KTVU. I am not sure
>>> of which way it scans or even if it does reject duplicate call signs that
>>> have different xmltvids.
>>>
>>> Ideally I could just set the scan to go from 31 to 31 and it would just
>>> find the new KTVU and I could manually edit out channel 44 if it isn't
>>> overwritten.
>>>
>>> Another idea I had was to add attenuators until the back stations no
>>> longer came in at all and then scan but my hope is there is an easier way.
>>> The repack is 4 stations of which 2 have both SF and SJ versions. Not sure
>>> if that would work though.
>>>
>>>
>>> There is the option "Scan of single existing transport" as described in
>> https://www.mythtv.org/wiki/Channel_Scanning#Channel_Scan but you have
>> to know the frequency to select the correct transport.
>> For ATSC only it is possible to select a from-to range of channels (this
>> are frequencies, not TV channels). This is described in section
>> https://www.mythtv.org/wiki/Channel_Scanning#ATSC_configuration
>>
>>
>>
> About
>
>> Ideally I could just set the scan to go from 31 to 31 and it would just
>> find the new KTVU and I could manually edit out channel 44 if it isn't
>> overwritten.
>
>
> I expect that this works without manual editing but you really need the
> latest mythtv, v31 or master, for this.
> The code uses the ATSC major/minor channel number to identify the channel
> so these numbers should stay the same.
> Note that the channel update  code has not been tested much because the
> repacks are not that frequent so I am interested in your results!
>
> Klaas.
>
> I am running MythTV Version : v0.28.2-6-g9031599 for the record.

I found that my KTVU has in fact moved to the repack channel 31 and that
Myth no longer could get it as the previous scan was 44. I deleted channel
2 (KTVU) in mythweb and then went to the channel editor and scanned from 31
to 31 and it worked.  Too easy. I then did a mythfilldatabase and have yet
to see a problem with the limited testing I did.

Allen
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