[mythtv-users] DVB-S2: How to decrypt a channel with card TBS6590 // changing adapter number

[Alain]

On 1/2/26 20:54, Klaas de Waal wrote:
> -v dvbcam --loglevel=debug

    The first attempt failed due, to what I believe a design change 
within mythtv. I have logical names for the DVB devices which gets 
recreated every time I reboot. For the Satellite card, for example today 
I have :

/dev/dvb/TBS6590-0:
total 4
lrwxrwxrwx 1 root root 15 jan  2 16:58 ca0 -> ../adapter1/ca0
lrwxrwxrwx 1 root root  3 jan  2 16:58 ca1 -> ca0
lrwxrwxrwx 1 root root 18 jan  2 16:58 demux0 -> ../adapter1/demux0
lrwxrwxrwx 1 root root  6 jan  2 16:58 demux1 -> demux0
-rw-r--r-- 1 root root 12 jan  2 16:58 dvb1
lrwxrwxrwx 1 root root 16 jan  2 16:58 dvr0 -> ../adapter1/dvr0
lrwxrwxrwx 1 root root  4 jan  2 16:58 dvr1 -> dvr0
lrwxrwxrwx 1 root root 21 jan  2 16:58 frontend0 -> ../adapter1/frontend0
lrwxrwxrwx 1 root root 21 jan  2 16:58 frontend1 -> ../adapter1/frontend1
lrwxrwxrwx 1 root root 16 jan  2 16:58 net0 -> ../adapter1/net0
lrwxrwxrwx 1 root root  4 jan  2 16:58 net1 -> net0

    But when I recreated the capture cards for myth-0.35, I could no 
longer use these logical names and I had to hard-code the 
value /dev/dvb/adapter0/frontend1. But after yesterday's last reboot, as 
can be seen above, the TBS6590, decoder 0, is now 
/dev/dvb/adapter1/frontend1. Adapter0 is now for the Nova1 capture card.

  So I now get :

2026-01-03 14:50:09.218308 W [91754/91754] CoreContext 
dvbchannel.cpp:258:Open  DVBChan[25](/dev/dvb/adapter0/frontend1): 
Opening DVB frontend device failed.
             eno: No such file or directory (2)

    I remember having this conversation back in 2019 when you said that 
the logical names would no longer be needed in future releases. Am I 
missing something, or do we still need some kind of logical names ?

    For now, I've gone back to hard-coding the logical path in the DB :

update capturecard set videodevice = '/dev/dvb/TBS6590-0/frontend1' 
where cardid = 25 or cardid = 29;

     Luckily, that still works :

2026-01-03 15:08:44.425127 D [92620/92620] CoreContext 
cardutil.cpp:1866:GetStartChannel  CardUtil[25]: Start channel 4 on 
inputid 25
2026-01-03 15:08:45.124374 I [92620/92620] CoreContext 
cardutil.cpp:1208:SetDeliverySystem  CardUtil[25]: Set delivery system: 
DVB-S2
2026-01-03 15:08:46.298308 D [92620/92620] CoreContext 
dtvmultiplex.cpp:375:ParseDVB_S2  DTVMux: ParseDVB_S2 frequency:10971000 
inversion:a symbol_rate:29700000 fec_inner:auto modulation:qpsk 
polarity:h mod_sys:DVB-S2 rolloff:0.35
2026-01-03 15:08:46.298327 D [92620/92620] CoreContext 
dtvchannel.cpp:296:SetChannelByString 
DTVChan[25](/dev/dvb/TBS6590-0/frontend1): SetChannelByString(4): 
Initialize multiplex options m_tunerType:32 mplexid:33
2026-01-03 15:08:46.374207 D [92620/92639] TVRecEvent 
portchecker.cpp:75:checkPort  PortChecker::checkPort(): host localhost 
port 3306 timeLimit 30000 linkLocalOnly 1
2026-01-03 15:08:46.377106 D [92620/92620] CoreContext 
cardutil.cpp:1866:GetStartChannel  CardUtil[29]: Start channel 4 on 
inputid 29

    I'll wait for your thoughts on this one. I'm now going back to the 
previous thread (separate email), getting that DVB card working.

Regards,

Alain