[mythtv] ATSC scan, default channel number

John P Poet jppoet at gmail.com
Sat Jul 10 15:41:05 UTC 2021

On Sat, Jul 10, 2021 at 7:30 AM Klaas de Waal <klaas.de.waal at gmail.com>

> On Sat, 10 Jul 2021 at 10:32, Klaas de Waal <klaas.de.waal at gmail.com>
> wrote:
>> On Fri, 9 Jul 2021 at 22:57, John P Poet <jppoet at gmail.com> wrote:
>>> Hi Klaas,
>>> I am setting up a new development machine to do some work. In the
>>> process I noticed that when scanning ATSC channels, no default channel
>>> number is given and the user must manually choose one for every single
>>> channel. This is when the user chooses to manually pick which channels get
>>> inserted into the DB.
>>> For example, the message I am getting is:
>>>> You chose to manually insert channel 7_1 (KOAT-DT). Please enter a
>>>> unique channel channel number. Default value is
>>> If I just click on OK, it just redraws the same dialog box. Instead I
>>> have to select Edit and type in 7_1. I could have sworn this was more
>>> automatic the last time I did this. Any chance you can have it pick a good
>>> default?
>>> Hi John,
>> This definitely should be automatic so there is something really wrong.
>> The correct behavior is to use the received channel number without asking
>> and when there is a conflict the suggestion channel number is with a letter
>> added.
>> There should also be the option in the dialog for "OK for all"  so that
>> it is never asked again.
>> It could be a coincidence but there are also threads in the forum about
>> ATSC cable scanning not working at all or crashing once the scan is
>> complete. And that is with v31. I assume you are using master.
>> At least you still get the correct channel numbers and names, which the
>> ATSC cable scans do not even do anymore.
>> What makes this a puzzle is that I have not changed anything significant
>> in the scanning code for a long time now.
>> On the other hand, maybe people do not do channel scans that often....
>> The scanning does work correctly with DVB-T2/C/S2 as you might have
>> guessed.
>> I will have a look at the code this weekend and possibly try to do a
>> simple ATSC scan with a captured ATSC transport stream. Have done that in
>> the past so I should be able to do that again....
>> In the meantime, if you have an idea what is wrong be welcome to explore
>> and fix it!
>> Hi John,
> Can you please send me a complete backup of your database after you have
> done one or more scans?
> Rationale:
> In master the "Scan type"  "Import Existing Scan" allows playing back
> again a scan previously done. I expect the bug to be in the channel
> importer where the options such as "Complete scan data required" etc are
> processed and this can be replayed from an existing scan. Which then
> hopefully enables me to debug the channel numbering code with your ATSC
> scan.
> Thanks,
> Klaas.

Yes, I can do that. I will replicate what I did when I saw the problem,
which was to do a scan on an initial setup, i.e. brand new database.

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