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

[John Pilkington]

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 
> Rhħne-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

I'm afraid I'm not familiar with the French TV standards; but I've been 
having some problems since recent changes in the UK.  Some muxes are on 
frequencies used earlier but have changed characteristics.  My old habit 
of updating by scanning 'all known transports' didn't get things right. 
Have you 'deleted old transports,' or perhaps entered new parameters 
from an up-to-date listing?

John P