[mythtv-users] Guidance for phase 9

Tue Aug 13 16:11:55 UTC 2019

On Tue, Aug 13, 2019 at 8:07 AM Tom Dexter <digitalaudiorock at gmail.com>
wrote:

> On 8/13/19, Tom Dexter <digitalaudiorock at gmail.com> wrote:
> > On 8/12/19, Allen Edwards <allen.p.edwards at gmail.com> wrote:
> >> On Mon, Aug 12, 2019 at 1:26 PM Tom Dexter <digitalaudiorock at gmail.com>
> >> wrote:
> >>
> >>> On 8/12/19, Allen Edwards <allen.p.edwards at gmail.com> wrote:
> >>> > In planning for Phase 9 channel reassignments scheduled for next year
> >>> > I
> >>> > found this quote (paraphrase):
> >>> >
> >>> > "MythTV rescan is just too difficult so I did it manually and it only
> >>> took
> >>> > 4 hours"
> >>> >
> >>> > Not what I wanted to find. Can someone point me to how this should be
> >>> done.
> >>> > Specifically, I find four possibilities on how this might be done in
> >>> > two
> >>> > menus:
> >>> > In Connect Source to Inputs
> >>> > 1) Scan for Channels
> >>> > 2) Fetch channels from Listing Source
> >>> >
> >>> > In Channel Editor
> >>> > 1) Channel Scan
> >>> > 2) Edit Transports
> >>> >
> >>> > I have learned the hard way not to just experiment so I am asking for
> >>> > guidance.
> >>> >
> >>> > I have two HD Homerun dual tuners (first generation) so I have four
> >>> capture
> >>> > cards listed and connected to a single Video Source called "Antenna
> >>> North"
> >>> > which is linked to Schedules Direct. All the capture cards are
> >>> > apparently
> >>> > set up as MPEG2TS.
> >>> >
> >>> > My system is Mythbuntu 14.04.1 LTS and MythTV fixes/0.28
> >>> >
> >>> > Is there some documentation or can someone give me some specific
> >>> > guidance
> >>> > for doing the required rescan or other channel reassignment process.
> >>> >
> >>> > Allen
> >>> >
> >>>
> >>> I just replied to a thread from James Abernathy with the subject "USA
> >>> OTA FCC frequency rescan?" that you may want to check out. As far as I
> >>> know, the biggest pitfall of the channel rescan in mythtv-setup is the
> >>> possibility of new channels getting created when you really want to
> >>> just change the frequency of existing channels. This (also as far as I
> >>> know) is caused by the station changing the callsign that gets
> >>> reported from the signal itself.
> >>>
> >>> Assuming you have something that can be used to just scan channels to
> >>> a file as I describe in that reply, you should be able to use the
> >>> channel editor to change and callsigns to the new ones before doing
> >>> the rescan to prevent that.
> >>>
> >>> I'm actually one of those who's written utilities of my own to
> >>> manually change frequencies surgically, but again, I believe those
> >>> callsign changes are the main source of unwanted results.
> >>>
> >>> Tom
> >>>
> >>>
> >> I am not sure I understand the call signs of these stations. Let me give
> >> an
> >> example.  Channel 7_3 in MythTV Channel infor is LAFFTV.  In HDHomeRun
> >> (under windows) it is also LAFFTV. In Schedules Direct it is KGODT3  and
> >> the channel that overwrites it is KGOLD3. I think I should ignore the SD
> >> name.
> >>
> >> I did hdhomerun_config 10126134 scan /tuner1 filescan and for the above
> >> channel I get two listings
> >> Channel 35 Program 5 7.3 LAFFTV
> >> Channel 7 Program 5 7.3 LAFFTV
> >>
> >> That is the problem I always have with scan. I end up with channel 35
> and
> >> I
> >> want channel 7. According the the repack guidance I am seeing, 7 will
> >> move
> >> to 12 and 35 stays put. This will still give ma a problem when I scan. I
> >> think I just rescanned and interrupted it before the overwrite but I am
> >> not
> >> sure.
> >>
> >> So just to clarify, you are suggesting checking that LAFFTV and all the
> >> other channels to check for name changes then just do a rescan and
> figure
> >> out how to deal with channel 7.
> >>
> >> It looks like the repack will move 4 stations we watch.
> >>
> >> Channel 35 comes to the back of my antenna and is weak. It has the same
> >> program information as channel 7.
> >>
> >> Allen
> >>
> >
> > Wow...I'm a bit confused as to what you're saying. Here's an example
> > what my output from the scan looks like:
> >
> > SCANNING: 599000000 (us-bcast:35)
> > LOCK: 8vsb (ss=92 snq=98 seq=100)
> > TSID: 0x07D5
> > PROGRAM 1: 4.1 WNBC
> > PROGRAM 2: 4.2 COZI-TV
> > PROGRAM 3: 47.1 WNJU-HD
> > PROGRAM 4: 47.2 TeleX
> >
> > That PROGRAM reported there (stored as the serviceid on the channels
> > table) is always unique for the specific frequency and defines the
> > specific channel on the multiplex. What's the exact output you're
> > getting? It sounds like you're saying you get the same channel and
> > callsign (7.3  LAFFTV) on two completely different frequencies. If so
> > that's pretty ugly and I have no clue how or if the channel scan would
> > deal with that.
> >
> > As to the callsign reported by SD that should have no affect on
> > anything related to the scan. As mentioned above, the only connection
> > between the MythTV channels and XMLTV is the xmltvid on the channel.
> >
> > Tom
> >
>
> Sorry...clearly didn't read you're reply carefully enough. It sounds
> like that's exactly what you're saying. I assume  that when you refer
> to channel 7 and 35 you mean the VHF channel 7 and UHF channel 35.
>
> Wow, yea that's a tough one, and I've never encountered that. Maybe
> someone else here knows what might happen in that case.
>
> Tom
> _______________________________________________
>

Yes, I am referring to transmitter channel 7 and 35.  After the repack they
will be transmitter channel 12 from San Francisco and transmitter channel
35 from San Jose. I live between the two.  They both carry the same
programming and both are virtual channel 7. What happens is that you end up
with transmitter channel 35 and nothing for channel 7.

What I remember for sure is that it was a problem because I want
transmitter 7 and after the scan I got transmitte 35, which is weak.  I
think I repeated the scan to clear it.  I don't recall if the scan started
at the high end, got 35 and then ignored 7 or if it started at the low end
and when it got to 35 it overwrote 7. My forensics indicate that I started
the final scan on 7.1 so once I know which way the scan works, I will know
what I did.

Perhaps I could have renamed the channels from transmitter 35 to something
other than 7 and then deleted them after the second scan. But I dealt with
it before so I guess I can deal with it again. It is just too bad I can't
just edit something or fetch channels from listing source and have that
work and avoid the scan.

Two questions remain unanswered (or perhaps unasked):
1) Does "Fetch channels from listing source" work? If so, what does it do?
2) Is there documentation on "Edit Transport" beyond don't use it unless
you know what you are doing?

I only need to change 4 channels although that represents a larger number
of sub channels.

Allen
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