[mythtv-users] scan fails, some old channels no longer "lock" but w-scan sees all channels

Tue May 1 17:51:13 UTC 2018

On 01. 05. 18 15:39, Alain wrote:
> On 01. 05. 18 14:52, Stephen Worthington wrote:
>> On Tue, 1 May 2018 13:32:54 +0100, you wrote:
>>
>>> On 01/05/18 13:14, Alain wrote:
>>>> Hi,
>>>>
>>>>     On the 24th, the French did something to their emitters and we need
>>>> to rescan. TF1 works, but "France 2" fails. The Swiss channels all work.
>>>>
>>>> However, using mythtv-setup, the scan option never detects any channels:
>>>> "no new channels found"; even after I delete all channels from the
>>>> channel table.
>>>>
>>>> If I run
>>>>
>>>>      w_scan -c CH > /var/tmp/channels.conf
>>>>
>>>> The channels are detected proving that they are there:
>>>>
>>>> C8;NTN:474000:B8D0G8M64T8Y0:T:27500:120=27:0;130,131,132:0;140,141:0:513:8442:2:0
>>>> BFM TV;NTN:474000:B8D0G8M64T8Y0:T:27500:320=27:0;330:0;340:0:515:8442:2:0
>>>> CNEWS;NTN:474000:B8D0G8M64T8Y0:T:27500:420=27:0;430:0;440:0:516:8442:2:0
>>>> CSTAR;NTN:474000:B8D0G8M64T8Y0:T:27500:520=27:0;530,531:0;540,541:0:517:8442:2:0
>>>> Gulli;NTN:474000:B8D0G8M64T8Y0:T:27500:620=27:0;630,631,632:0;640,641:0:518:8442:2:0
>>>> France 2;GR1
>>>> B:666000:B8D0G8M64T8Y0:T:27500:120=27:0;130,131,132:0;140,142:0:257:8442:1:0
>>>> France 4;GR1
>>>> B:666000:B8D0G8M64T8Y0:T:27500:320=27:0;330,331,332:0;340,342:0:260:8442:1:0
>>>> France Ô;GR1
>>>> B:666000:B8D0G8M64T8Y0:T:27500:520=27:0;530,531:0;540:0:261:8442:1:0
>>>> franceinfo ;GR1
>>>> B:666000:B8D0G8M64T8Y0:T:27500:620=27:0;630:0;640:0:262:8442:1:0
>>>> F3
>>>> Rh?ne-Alpes;FTV:666000:B8D0G8M64T8Y0:T:27500:220=27:230=fre at 3,231=qad,232=qaa:0;240,242:0:282:8442:1:0
>>>> F3
>>>> Alpes;FTV:666000:B8D0G8M64T8Y0:T:27500:720=27:730=fre at 3,731=qad,732=qaa:0;740,742:0:324:8442:1:0
>>>> M6;Multi4:506000:B8D0G8M64T8Y0:T:27500:120=27:0;130,131,132:0;140,141:0:1025:8442:4:0
>>>> W9;Multi4:506000:B8D0G8M64T8Y0:T:27500:220=27:0;230,231,232:0;240,241:0:1026:8442:4:0
>>>> Arte;Multi4:506000:B8D0G8M64T8Y0:T:27500:320=27:0;330,331,332,333:0;340,341,342:0:1031:8442:4:0
>>>> France
>>>> 5;Multi4:506000:B8D0G8M64T8Y0:T:27500:420=27:0;430,431,432:0;440,441:0:1045:8442:4:0
>>>> 6ter;Multi4:506000:B8D0G8M64T8Y0:T:27500:520=27:0;530,531,532:0;540,541:0:1046:8442:4:0
>>>> TF1;SMR6:498000:B8D0G8M64T8Y0:T:27500:120=27:0;130,131,132:0;150,151:0:1537:8442:6:0
>>>> NRJ12;SMR6:498000:B8D0G8M64T8Y0:T:27500:220=27:0;230,231,232:0;250,251:0:1538:8442:6:0
>>>> TMC;SMR6:498000:B8D0G8M64T8Y0:T:27500:620=27:0;630,631,632:0;650,651:0:1542:8442:6:0
>>>> TFX;SMR6:498000:B8D0G8M64T8Y0:T:27500:520=27:0;530,531:0;550,551:0:1544:8442:6:0
>>>> LCP;SMR6:498000:B8D0G8M64T8Y0:T:27500:720=27:0;730:0;750:0:1545:8442:6:0
>>>> 8_Mont_Blanc;Harmonic:674000:B8D0G32M64T8Y0:T:27500:720=27:730=fra at 3:0:0:2050:8442:8:0
>>>> LemanBleu HD;LemanBleu
>>>> TV:554000:B8:T:27500:516+515=27:517 at 3:518:0:513:0:3841:0
>>>> SRF 1;Schweizer Radio und
>>>> Fernsehen:578000:B8C23D0G4M16T8Y0:T:27500:160=2:80=deu at 3,81=eng:32:0:1:8948:4:0
>>>> RTS Un;Radio Television
>>>> Suisse:578000:B8C23D0G4M16T8Y0:T:27500:161=2:84=fra at 3,85=eng:35:0:257:8948:4:0
>>>> RTS Deux;Radio Television
>>>> Suisse:578000:B8C23D0G4M16T8Y0:T:27500:164=2:96=fra at 3,97=eng:44:0:258:8948:4:0
>>>> RSI LA 1;Radiotelevisione
>>>> svizzera:578000:B8C23D0G4M16T8Y0:T:27500:162=2:88=ita at 3,89=eng:38:0:513:8948:4:0
>>>>
>>>> TF1, NRJ12, RTS* all work fine. But F3 or France 2, can no longer be
>>>> seen by mythtv. My real TV is able to pick all those channels, but I did
>>>> a rescan on it.
>>>>
>>>>    So mythtv-setup fails to find any channel anymore. I'm including the
>>>> logs of mythtv-setup. But I couldn't find anything useful in them.
>>>>
>>>> fixes/29 [v29-rc1-4-g696806310a]
>>>> All channels seem to be shown with the message "Channel xx offset 1 --
>>>> Timed out, no si...". And then
>>>>      "Failed to find any new channels!"
>>>>
>>>> However, I can see the Signal Strength bar move to above 50% for some of
>>>> those channels.
>>>>
>>>> I've included the log using --loglevel=debug. (Actually had to remove it
>>>> to pass the max message size lmit)
>>>>
>>>>     I'm also including a partial log of mythbackend --loglevel=debug when
>>>> I try to watch the TV.
>>>> First I "watched TF1" and that worked, then I changed to "France 2" and
>>>> I got the error that it couldn't get a lock.
>>>> There seems also to be a recording started on another channel (Swiss)
>>>> which worked fine.
>>>>
>>>> In the log, look for:
>>>>
>>>> 2018-04-28 17:11:34.363564 I  TVRec[17]: HandleTuning Request:
>>>> Program(NULL) channel(2) input() flags(LiveTV,)
>>>> 2018-04-28 17:11:39.390308 W  TVRec[17]: See 'Tuning timeout' in
>>>> mythtv-setup for this input
>>>>
>>>>     Otherwise, most recent version of Ubuntu 17.10.
>>>> System:    Host: mytv Kernel: 4.13.0-39-generic x86_64 bits: 64 gcc:
>>>> 7.2.0 Desktop: Xfce 4.12.3 (Gtk 2.24.31)
>>>>              Distro: Ubuntu 17.10
>>>> MythTV Version : v29-rc1-4-g696806310a
>>>> MythTV Branch : fixes/29
>>>> Network Protocol : 91
>>>> Library API : 29.20170212-1
>>>> QT Version : 5.7.1
>>>>
>>>>      Given that I've been using MythTV for years, this is a bit
>>>> frustrating: channel scanning used to work just fine.
>>>>
>>>> Alain Brossard
>>>>
>>>> That was my thought too.  The channels you are having problems with
>>>> seem to be all on the 666000 MHz multiplex.  So if that used to be on
>>>> a different frequency, you may need to either scan that frequency
>>>> manually, or do a full scan of all frequencies.  I believe w_scan will
>>>> just scan all frequencies, so it found the new frequency.  MythTV will
>>>> only scan all frequencies if you tell it to do that, rather than to
>>>> scan the existing ones.
>>>>
>>>> This sort of thing may well be better in v30 - I think the code for
>>>> scanning is being updated to better conform to the DVB-T standards,
>>>> which means that it should find the messages that get sent on one
>>>> frequency telling it to scan on a different frequency when things
>>>> move.
>>>>
>>>> If you are up for some SQL, this command should show you all the
>>>> frequencies for your existing multiplexes:
>>>>
>>>> select mplexid,sourceid,transportid,networkid,frequency from
>>>> dtv_multiplex;
>>>>
>>>> If the frequency column does not have any entry where the frequency is
>>>> 660000000, then your problem channels have moved to a new frequency.
>>>> _______________________________________________
>>>> mythtv-users mailing list
>>>> mythtv-users at mythtv.org
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>>>> http://wiki.mythtv.org/Mailing_List_etiquette
>>>> MythTV Forums:https://forum.mythtv.org
>>>>
> Hi, actually, it isn't only the 66000 frequency, but also the 506000 
> which is no longer working; not that this helps :-(.
> I confirm that neither is present in dtv_multiplex.
>   I told mythtv to do a full scan so what can I do to tell it to do a 
> real full scan?
>
>   Do I need to modify mplexid?  If so, just tell me what I need to 
> insert. I've tried to do a "Full Scan(Tuned)" but got "Error parsing 
> parameters".
>  Scan of existing transport: at least it found some already existing 
> channels whereas the "full scan" finds nothing.
>
>   So what next?
>
> Alain
I've added the new frequencies to the table dtv_multiplex, but I'm not 
sure what to use as value for mplexid and transportid. My first attempt 
at mplexid 30/31 failed to scan at all.
   I've re-run a scan and the channels are now seen. However, those at 
frequency 666000000 still can't get a lock and those at frequency 
506000000, though they can be watched, the On-Air Program guide is 
empty, no program info seems to be caught by MythTV.

select mplexid, transportid, networkid, frequency from dtv_multiplex;
+---------+-------------+-----------+-----------+
| mplexid | transportid | networkid | frequency |
+---------+-------------+-----------+-----------+
|       3 |           4 |      8442 | 506000000 |
|       2 |           4 |      8442 | 666000000 |

  The partial result from the new scan :
select chch.transportid, chch.scanid, mplex_id, callsign, chan_num, 
service_id, frequency from channelscan_channel chch, 
channelscan_dtv_multiplex dtv where chch.transportid = dtv.transportid 
and not is_data_service order by callsign, scanid;
+-------------+--------+----------+-----------------+----------+------------+-----------+
| transportid | scanid | mplex_id | callsign        | chan_num | 
service_id | frequency |
+-------------+--------+----------+-----------------+----------+------------+-----------+
|         210 |     26 |        2 | France 2        | 2 |        257 | 
666000000 |
|         210 |     26 |        2 | France 4        | 14 |        260 | 
666000000 |
|         210 |     26 |        2 | France Ô        | 19 |        261 | 
666000000 |
|         210 |     26 |        2 | franceinfo:     | 27 |        262 | 
666000000 |
|         220 |     27 |        3 | M6              | 6 |       1025 | 
506000000 |
|         220 |     27 |        3 | W9              | 9 |       1026 | 
506000000 |

   I had erased both tables before running the latest scans which is why 
we only have the results for the last 2 scans.
I haven't figured out how to match from the table channel to these two 
tables. I would like to do some clean up as everytime I run a scan, I 
get more and more channels (/transportid/scanid).

Alain

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