DVB-C DeviceHost cannot tune channels on Raspberry Pi 5

[dino0206]

Hello ppl,

Summary
I am running the latest ARM64 Docker image of NextPVR on a Raspberry Pi 5.
The DVB-C scan succeeds and channels are imported correctly, but Live TV and recordings always fail with:

Code:

No tuner was available for the requested channel.

The DeviceHost logs show:

Code:

Failed to get tuning params for (...) from /config/adapterX-DVB-C-channels.conf

The file is either never generated by NextPVR or the DeviceHost expects a different format than the standard DVBv5 tuning files.

---

Environment
Hardware

• Raspberry Pi 5
  
• 8 GB RAM
  
• Hauppauge WinTV-dualHD (dual DVB-C/T/T2)
  
• USB 3.0 connection
  

OS

Code:

Linux dino-pi 6.18.33+rpt-rpi-2712
Debian 13 (Trixie)
64-bit ARM

Kernel:

Code:

Linux dino-pi 6.18.33+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.18.33-1+rpt1

---

NextPVR
Docker image:

Code:

nextpvr/nextpvr_arm64:stable

Version:

Code:

7.1.1.260616

---

Docker Compose

Code:

nextpvr:
  image: nextpvr/nextpvr_arm64:stable
  container_name: nextpvr

  environment:
    - TZ=Europe/Vienna

  devices:
    - /dev/dvb/adapter0:/dev/dvb/adapter0
    - /dev/dvb/adapter1:/dev/dvb/adapter1

  volumes:
    - /opt/nextpvr/config:/config
    - /mnt/media/tv-aufnahmen:/recordings
    - /mnt/downloads:/buffer

  ports:
    - "8866:8866"

  restart: unless-stopped

---

DVB Devices detected
NextPVR detects both tuners correctly.

Code:

adapter0/frontend0 (Silicon Labs Si2168)
adapter1/frontend0 (Silicon Labs Si2168)

Both are shown as

Code:

Present = true
Enabled = true

---

Driver

Code:

em28xx
si2168

Kernel modules load correctly.
After reboot there are no I²C errors anymore.

---

Signal
Signal quality is 37dB.
Example:

Code:

C/N = 37.5 dB

---

DVB Utilities

Code:

dvbv5-zap

Tunes correctly.

Code:

w_scan

Works.
It finds over 220 TV services.

Code:

channels.conf

is generated.

---

NextPVR Scan
The channel scan succeeds.
Example from device log:

Code:

Scanning 474000000
Scanning 482000000
Scanning 490000000
Scanning 498000000
Scanning 506000000
Scanning 514000000
Scanning 522000000
Scanning 530000000
Scanning 538000000
...

Channels are found and imported.
Example:

Code:

Arena Sport 1 HD
Arena Sport 2 HD
Arena Sport 3 HD
Pink Kids
BN 2 TV
...

Around 220 channels are imported.

---

Problem
When starting Live TV:

Code:

No tuner was available for the requested channel.

---

nrecord.log

Code:

checking: adapter1/frontend0
enabled and present
has channel
live tv is possible

NextPVR launches DeviceHost correctly.
Example:

Code:

DeviceHostLinux
-listen:39823
-type:DVB-C
-device:"adapter1/frontend0"

DeviceHost receives:

Code:

<tuning>
  <type>DVB-C</type>
  <name>Arena Sport 3 HD</name>

  <locator>
    <conf>514000000OFF</conf>
  </locator>

  <service_id>2320</service_id>
</tuning>

---

DeviceHost error
Immediately afterwards:

Code:

Failed to get tuning params for
(Arena Sport 3 HD)
from

/config/adapter1-DVB-C-channels.conf

Then:

Code:

HTTP 404

Finally:

Code:

No tuner was available for the requested channel.

---

Important observation
Originally there was no

Code:

adapter0-DVB-C-channels.conf

or

Code:

adapter1-DVB-C-channels.conf

inside

Code:

/config

.
The DeviceHost still expects them.

---

Experiments
I manually created

Code:

adapter0-DVB-C-channels.conf
adapter1-DVB-C-channels.conf

using:

• DVBv5 format
  
• frequency sections
  
• standard NextPVR tuning format
  

Examples:

Code:

[514000000OFF]
DELIVERY_SYSTEM = DVBC/ANNEX_A
FREQUENCY = 514000000
SYMBOL_RATE = 6900000
INNER_FEC = NONE
MODULATION = QAM/256
INVERSION = AUTO

Parser accepts the syntax (no parsing errors),
but DeviceHost still reports:

Code:

Failed to get tuning params

which suggests it expects a different internal format.

---

Additional information
Missnet (Bosnia)
DVB-C

Code:

6900 KS/s
QAM256

Frequencies:
394 MHz
402 MHz
410 MHz
418 MHz
426 MHz
434 MHz
442 MHz
450 MHz
458 MHz
466 MHz
474 MHz
482 MHz
490 MHz
498 MHz
506 MHz
514 MHz
522 MHz
530 MHz
538 MHz
546 MHz
554 MHz
562 MHz
570 MHz
578 MHz
586 MHz
594 MHz
602 MHz
610 MHz
618 MHz
626 MHz
634 MHz

---

Question
Should NextPVR automatically generate

Code:

adapter0-DVB-C-channels.conf
adapter1-DVB-C-channels.conf

after scanning?

Since scanning succeeds and

Code:

w_scan

works perfectly, the tuner and driver appear to be functioning correctly. The failure seems to occur only when DeviceHost attempts to resolve tuning parameters for live streaming.
Thank you for your help.

[mvallevand]

Could you attach the zipped log, after trying a scan. Arm64 Docker is new for NextPVR

On an RPI why not just run native version?

Martin

[dino0206]

Was already using docker for vpn etc so i installed it as a docker :/

[mvallevand]

OK when you say it didn't create the adapter conf file I suspect you didn't let the scan finish at the beginning it will take a long time. Unfortunately your logs don't go back to the original scan and a scan is still going on right now.

My suggestion stop Docker remove the adapter files you made and delete npvr.db3 and do the scan again and then when it say complete upload the logs.

Martin

[dino0206]

scan stopped at some point with aorund 60 channel. i will try your Suggestion