DiSEqC port does not change

[PeterVB]

I've installed NextPVR on Debian Linux (Trixie).
I've also installed the NSShared.ddl (April 2, 2026).
I am using a four port DiSEqC connected to three LNBs (port four is not used).

Port 1: 19.2 Astra 1
Port 2: 28.2 Astra 2
Port 3: 23.5 Astra 3
Port 4: -

When I start Scanning, it seems to be working fine. 
When checking the DiSEqC, I can see that it is using Port 1.
NextPVR finds over 600 channels, which is okay for Astra 1.

Then the channelcounter (Channels found ...) starts over. First the count disappears, then it comes back with a low count.
I suppose NextPVR now wants to scan the transponders on Port 2 (Astra 2) of the DiSEqC, however the port on the DiSEqC has not changed!
The LED on port 1 is still emitting light, so DiSEqC has not switched to Port 2.

After over 30 minutes it is still scanning 12168000 kHz and number of channels is stable at 44. Seems like NextPVR is stalled.

With same hardware, Linux and same dvb-driver and Tuner, I have tested this exact same setup with MythTV and TVheadEnd.
Both work fine controlling the the DiSEqC.
I could just use MythTV or TVheadEnd but I prefer to use NextPVR.

Seems like NextPVR does not send the command to switch the DiSEqC port.

Is this a known issue? Is there a solution for this issue ?

Regards.

[mvallevand]

I just replied to your deleted post but could you please send the zipped logs from the main setting screen. Also what does find /dev/dvb look like.

Nice look there on 3 satellites from your place. I am currently working on bouquet support for Astra 28.2 and your configuration is not one I had considered.

Martin

[PeterVB]

Hi Martin,

thanks for you reply.

I indeed deleted the post as there was something wrong with the attachments and update post did not give me the result I wanted.

I was just reading the logs myself.
Seems line NextPVR is looping at the end, multiple times it repeats below until I cancel the scan.

2026-04-24 15:25:47.378 [DEBUG][37] Got request [192.168.178.161]: /services/service (setting.scan.status)
2026-04-24 15:25:47.378 [DEBUG][37] parameters:
2026-04-24 15:25:47.378 [DEBUG][37]   method: setting.scan.status
2026-04-24 15:25:47.378 [DEBUG][37]   format: json
2026-04-24 15:25:47.378 [DEBUG][37]   sid: 359104a5-aeb5-4f68-bf25-5eb2cf75f4cb
2026-04-24 15:25:47.378 [DEBUG][37]   client_ip: 192.168.178.161
2026-04-24 15:25:47.378 [DEBUG][37]   client_local: true
2026-04-24 15:25:47.378 [DEBUG][37]   user_agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:150.0) Gecko/20100101 Firefox/150.0
2026-04-24 15:25:47.378 [DEBUG][37]   host_callback: ...
2026-04-24 15:25:47.378 [DEBUG][37] setting.scan.status
2026-04-24 15:25:47.379 [DEBUG][37] {"stat":"ok",
"complete":false,
"status":">>> Scanning 12168000 (44 channels found)",
"channels": [
]

# find /dev/dvb
/dev/dvb
/dev/dvb/adapter0
/dev/dvb/adapter0/frontend1
/dev/dvb/adapter0/frontend0
/dev/dvb/adapter0/net0
/dev/dvb/adapter0/dvr0
/dev/dvb/adapter0/demux0

I have attached the zip file.

[mvallevand]

The loop is normal until you exit the screen. I think I see what might be going on Could you confirm that it works ok with dvbv5-scan

dvbv5-scan -a 0 -f 1 -S 0 -l UNIVERSAL /usr/share/dvbv5/dvb-s/Astra-28.2E
dvbv5-scan -a 0 -f 1 -S 1 -l UNIVERSAL /usr/share/dvbv5/dvb-s/Astra-19.2E
dvbv5-scan -a 0 -f 1 -S 2 -l UNIVERSAL /usr/share/dvbv5/dvb-s/Astra-23.5E

Since you are doing a long scan git the most recent scan files git https://git.linuxtv.org/dtv-scan-tables.git/tree/dvb-s You might need to make a big one for 19.2

Martin

[PeterVB]

Hi Martin,

ran the dvbv5-scans.
You swapped port 1 and 2 in your commands.
port 1 = Astra-19.2E
port 2 = Astra-28.2E
port 3 = Astra-23.5E

Yes, I can confirm that the LED at port 2 and 3 emitted light when respectively scanning Astra-28.2E and Astra-23.5E,
which you can also see in the results of dvbv5-scan (different channels are shown).

Astra-23.5E did not yet give channel names as a result. I know that the last transponders only give a result. Same at my TV/Satellite receiver.

Attached the zip file with the results.

[mvallevand]

OK I just wanted you to confirm this I think I see a way forward, I will discuss with sub.

Martin

[PeterVB]

Great!

Please keep me updated on any progress regarding this issue

Have a nice day!

Peter

[mvallevand]

Peter, I made a little progress but could you help me out be providing some fullmux recordings for 19.2 and 23.5 and put them on some places I can download from, like GoogleDrive, OneDrive, Dropbox or Limewire. I can give some example of how to do this if you are willing.

Also I saw you are running on Arm64 which could be challenge for testing. I assume that is in an RPi but can you tell me what version of the OS you are running and what model of RPi. I can only build on am RPi5 my 4 starting smoking so I don't plug it in any more.

Martin

[PeterVB]

Hi Martin,

yes, of course. Just, tell me how I can gather the information.

I am using a Raspberry Pi 5 (8G), Raspberry Pi OS (Trixie), NVMe storage:

# cat /etc/os-release

PRETTY_NAME="Debian GNU/Linux 13 (trixie)"
NAME="Debian GNU/Linux"
VERSION_ID="13"
VERSION="13 (trixie)"
VERSION_CODENAME=trixie
DEBIAN_VERSION_FULL=13.4
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

# uname -a

Linux RPi5-8G-1 6.12.75+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.12.75-1+rpt1 (2026-03-11) aarch64 GNU/Linux


Peter

[mvallevand]

OK that's great thanks. Well will focus on some FTA and create some minimal conf files .

For 19.2 create this as 192martin.conf file in /usr/share/dvb/dvb-s

Code:

[Germany]
    DELIVERY_SYSTEM = DVBS2
    FREQUENCY = 10891250
    POLARIZATION = HORIZONTAL
    SYMBOL_RATE = 22000000
    MODULATION = PSK/8
    INNER_FEC = 2/3
    INVERSION = AUTO

[WDR]
    DELIVERY_SYSTEM = DVBS2
    FREQUENCY = 11523250
    POLARIZATION = HORIZONTAL
    SYMBOL_RATE = 22000000
    MODULATION = PSK/8
    INNER_FEC = 2/3
    INVERSION = AUTO

[Paramount International Networks, CHANNEL]
    DELIVERY_SYSTEM = DVBS
    FREQUENCY = 11973000
    POLARIZATION = VERTICAL
    SYMBOL_RATE = 27500000
    INNER_FEC = 3/4
    INVERSION = AUTO    

[Canal France, CHANNEL]
    DELIVERY_SYSTEM = DVBS2
    FREQUENCY = 12012000
    POLARIZATION = VERTICAL
    SYMBOL_RATE = 29700000
    MODULATION = PSK/8
    INNER_FEC = 2/3
    INVERSION = AUTO

[Austria]
    DELIVERY_SYSTEM = DVBS2
    FREQUENCY = 11273250
    POLARIZATION = HORIZONTAL
    SYMBOL_RATE = 22000000
    MODULATION = PSK/8
    INNER_FEC = 2/3
    INVERSION = AUTO

dvbv5-scan -a 0 -f 1 -S 1 -l UNIVERSAL /usr/share/dvbv5/dvb-s/192martin.conf -F - T 2 -o 192martin.conf

open 192maritn.conf and find a channel on 10891250 and note the channel_name

dvbv5-zap -a 0 -f 1 -S 1 -l UNIVERSAL -c 192martin.conf channel_name -P fullmux_192.ts

I only need on of the four frequencies now but I might ask for more later.

let it run for one minute and upload the ts file and give me the link.

The we can repeat that for 23.3 for a couple of Dutch frequencies and use -S 2

Code:

[M7 Group, CHANNEL]
    DELIVERY_SYSTEM = DVBS2
    FREQUENCY = 11739000
    POLARIZATION = VERTICAL
    SYMBOL_RATE = 29900000
    MODULATION = PSK/8
    INNER_FEC = 3/4
    INVERSION = AUTO

[M7 Group]
    DELIVERY_SYSTEM = DVBS2
    FREQUENCY = 12188000
    POLARIZATION = HORIZONTAL
    SYMBOL_RATE = 29900000
    MODULATION = PSK/8
    INNER_FEC = 3/4
    INVERSION = AUTO

We and use these shorened conf files for scanning later on when I give a patch for testing. For 28l.2 there are lots of choices for a filter conf file, I can offer suggestions if you need it.

For the RPi5 also run this command ldd --version to confirm my version I build will be compatible If you don't have that install try getconf GNU_LIBC_VERSION .

Your help is much appreciated.

Martin