[mythtv] Channel scanning data flow - never any saved channels

[Klaas de Waal]

On Wed, 16 Apr 2025 at 18:06, faginbagin <helen.buus at gmail.com> wrote:

> On 4/16/2025 2:45 AM, Klaas de Waal wrote:
>
>
>
> On Tue, 15 Apr 2025 at 23:07, Kingsley Turner <krt at krt.com.au> wrote:
>
>> G'day,
>>
>> Over the weekend I hosed my Mythbox.  A nvidia driver update borked lots
>> of
>> things, including GUI and network (scream!).  I couldn't back-out the
>> change, and elected to nuke-from-orbit.
>>
>> Over the last 15 years, I've installed mythtv a bunch of times, in
>> different
>> countries with different DVB-T/DVB-C inputs...  So I like to think I
>> kind-of
>> know what I'm doing.
>>
>> But on v35 (ppa.launchpadcontent.net/mythbuntu/35/ubuntu package) I
>> cannot
>> get channel scanning to work.  Under no circumstances do I get channels
>> in
>> my database.
>>
>>   - Both DVB-T tuners are working.
>>   - Both tuners find some channels.
>>   - In every case I used the web interface (or deprecated GUI) to "save"
>> the
>> found channels
>>   - (and "ignore" the non-channels)
>>
>> But the ultimate result is that there is no channels in the system.
>>
>> I'm not sure how to progress from here.
>>
>> Any sage advice would be much welcome.
>>
>> thanks,
>> -kt
>>
>>
>> ASIDE: the mythbuntu package seems to have pulled in  _newer_ libraries
>> that
>> what ubuntu has by default.  As soon as that was installed I started
>> getting
>> package issues on things like bzlib2 (many more) where the to-install
>> package wanted a slightly older library than the one installed.   I don't
>> really understand what's going on here.  I _guess_ my ubuntu packages are
>> slightly (days) old.  /me shrugs
>>
>>
> If you happen to use the database from your old system then it is a good
> idea to do the following:
> - delete the capture cards
> - make a new video source
> - connect the capture cards to the new video source
> - do the scan etc etc.
> If this does not work then it is best to create a ticket  in
> https://github.com/MythTV/mythtv/issues
>
> Klaas.
>
>
> Hi Klaas,
>
> Is there an advantage to deleting capture cards if everything seems to be
> working well after an upgrade? I have a hdhomerun flex 4k and just upgraded
> from v32/22.04 to v35/24.04 last Thursday and it's been recording without
> any problems. That includes a Sunday when I've got the most recordings
> going. I'll also be upgrading a family member's system in a couple of weeks
> with two tuners, a 3rd gen and a 4th gen hdhr connects.
>
> I've spent a lot of time over the years getting the channel and
> dtv_multiplex tables to make sense and am worried that deleting the capture
> cards and video sources will throw all that work out the window.
>

Hi Helen,

If all is working OK then you should not change anything!
FYI, the sequence to delete and recreate the capture cards and to create a
new video source has fixed DVB-T/T2 problems that some people had after an
upgrade from v31 or earlier to v33 or later. In v32/v33 the support for
DVBv5 was introduced and this made changes in the capture card and the
transport tables necessary.

 Klaas.
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