[mythtv] Has anyone tested channel scanning in a us-cable Clear QAM environment?

[faginbagin]

On 2/7/2020 1:55 PM, Klaas de Waal wrote:
> On Fri, 7 Feb 2020 at 08:00, faginbagin <mythtv at hbuus.com <mailto:mythtv at hbuus.com>> wrote:
> 
>     I ask because I can't get mythtv-setup to find any channels. I first
>     tried a scan before running mythfilldatabase as mentioned in this email
>     thread on mythtv-users:
>     http://lists.mythtv.org/pipermail/mythtv-users/2020-January/402291.html
> 
>     I just tried another channel scan after running mythfilldatabase.
>     mythfilldatabase added lots of channels and listings to the database,
>     but the channel data looked incomplete. So I did a full channel scan,
>     which said it was scanning for ATSC channels, not QAM, and found no
>     channels. I can't find any channel scan settings that distinguish
>     between ATSC and QAM.
> 
>     Not surprisingly, the channel data still looks wrong. For example, all
>     of the channel records have a NULL mplexid and the dtv_multiplex table
>     is empty. Has tuning a clear qam channel changed so much that channel
>     records don't need to point to valid dtv_multiplex records any more?
> 
>     FWIW, both "General -> Locale Settings -> Channel frequency table" and
>     "Video Sources -> MyVideoSource -> Channel frequency table" are set to
>     us-cable and the listings grabber is "Multinational (Schedules Direct
>     JSON web services w..." and the listings data looks correct.
> 
> 
> It is interesting to know which version of MythTV you are running. There are lots of changes in the latest master / v31 compared with previous versions.
> You might have missed the Scan Type/ Full Scan settings, see the end of this thread:
> https://forum.mythtv.org/viewtopic.php?f=36&t=3567  
> Also described here:
> https://www.mythtv.org/wiki/Channel_Scanning#Scan_Type_2  
> 
> 
> 
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Hi Klaas,

My apologies for not mentioning the version, it's v31 from the ubuntu PPA, 2:31.0~master.202002051824.e81d4cc~ubuntu19.10.1 and the distro is lubuntu 19.10 with the lxqt desktop.

Both the forum thread and images got me on the right track. Instead of scanning 51 ATSC channels, I'm now scanning 130+ QAM-256 channels. It's still in progress. I'll report back once I've done further testing.

But I must say the new settings UI is quite confusing and a departure from how other parts of mythtv's UI work. It hadn't occurred to me that right arrow would do something different than OK. Also, that left arrow behaves differently than ESC.

Another point of confusion: after navigating to the scan type page and changing the frequency table and modulation to cable and qam-256, followed by pressing ESC and being asked if I want to save my changes, and saying yes, why am I kicked out of not only the scan type page, but also out of the channel scan page? And when I go back into the scan type page, why are the frequency table and modulation settings back to the original broadcast and 8-vsb settings? Maybe something can be done to explain these points in the help text and the wiki?

And, if I've specified us-cable as the channel frequency table in the channel scan page and also in the Global -> Locale page, why does the frequency table in the scan type page always revert to Broadcast, not to mention 8-vsb modulation? Seems to me there's room for improvement in setting more reasonable defaults based on the us-cable setting as well as saving the settings the user specifies?

Food for thought?