Issue with scanning DVB-T channels

[zbuzanic]

I have TBS 6281SE v2 + unraid + docker nextpvr, my tuners are detected properly but when I go to scan channels nothing is detected, it shows

>>> Scanning 546000000

but nothing is detected, same machine, same card in Windows nextpvr works fine. I tried to copy npvr.db3 from windows data and then I got channels there but it does not work so I'm attaching logs, maybe you can help me with this.

I tried to scan inside docker:

./DeviceHostLinux -device:adapter0 -type: DVB-T -scan:/usr/share/dvb/dvb-t/hr-All
Partial output (not sure if this meas it found something or not):

Code:

025-11-17 21:33:41:966 [DEBUG] >>> Scanning 690000000
       (0x00) Signal= -91.99dBm
          Layer A: Signal= 0.00%
               (0x00) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm
          Layer A: Signal= 36.82%
        RF     (0x01) Signal= -71.87dBm

[mvallevand]

You'd have to have to let the manual dvbv5-scan complete to see if it find channels but I suspect a signal issue or a bad scanning file.

Martin

[zbuzanic]

Scanning file seems to be ok I tried tvheadend now and it found channels like in Windows and I managed to stream to Kodi without issues, so something in nextpvr is not working as expected.
I'm not sure what does "manual dvbv5-scan complete" means?

[mvallevand]

Did you use the same parameters for passing /dev/dvb the same for both dockers?

Sorry for the confusion I though you were doing a manual scan not using DeviceHostLinux but I definitely didn't see it lock The syntax for the manual scan in the docker would be as follows and you should see it lock when it finds a signal.

dvbv5-scan /usr/share/dvb/dvb-t/hr-All

Martin

[zbuzanic]

I searched for dvbv5-scan but it's nowhere to be found in docker or unraid..

[mvallevand]

Inside the NextPVR docker which I assumed you used to run DeviceHostLinux you might need to run apt install dvb-tools if sub doesn't include it.

We should be able to get to the bottom of this. I had a look at it appear the hr-ALL file that is in with Linux is dated before the conversion to DVB-T2 in Croatia. Perhaps tvheadend handles that differently I would try downloading this inside Docker.

curl https://raw.githubusercontent.com/tvhead...b-t/hr-All -O /usr/share/dvb/dvb-t/hr-t2All

Martin

[zbuzanic]

Hi, thnx, I have downloaded this and tried to scan with this in nextpvr, still nothing, then I installed dvb-tools and executed dvbv5-scan with same file and the result was:

Code:

dvbv5-scan /usr/share/dvb/dvb-t/hr-t2All
Scanning frequency #1 594000000
      (0x00) Signal= -92.39dBm
          Layer A: Signal= 0.00%
Scanning frequency #2 658000000
      (0x00) Signal= -91.99dBm
          Layer A: Signal= 0.00%
Scanning frequency #3 618000000
      (0x00) Signal= -91.57dBm
          Layer A: Signal= 0.00%
Scanning frequency #4 650000000
      (0x00) Signal= -91.57dBm
          Layer A: Signal= 0.00%
Scanning frequency #5 506000000
Lock  (0x1f) Signal= -68.96dBm C/N= 18.60dB
          Layer A: Signal= 42.63% C/N= 43.04%
malloc(): invalid size (unsorted)
Aborted

Attaching new logs if you have any use of them. If needed we can setup a session or whatever you need to investigate further as I really want to continue using nextpvr

[mvallevand]

Seems like libdvbv5 that NextPVR uses is having problems with 506Mz since that is where DeviceHostLinux is stopping too. If you aren't in region D03 https://support.oiv.hr/reception/temp/DT...eOnly.aspx maybe just remove it and hope there are not other problems. I figure it is plp related.

As for debugging the problem since the Linux library that NextPVR crashes the normal method I would use to get the full mux on Linux won't work. If you do have channels on the mux this (apparently) will do it https://docs.tvheadend.org/documentation...a-mux-dump from TVH. If you do receive 506 on Windows then you could get the full mux there.

It might also be related to how you compiled the TBS driver too, since they aren't supported by kernel.

Martin