DVB-T2 Scan not working after upgrading to 4.3

Sebastian Schwarzbrunn

Hi folks,

in 4.2.x DVB-T2 scans worked perfectly. When I upgrade to 4.3, the scans are constantly failing.
Version: 4.3-2098~g44bf691ac
OS: Debian 12

Tuner: WinTV DualHD

Scanning Astra 19.2E with a WinTV HVR4000 worked. So it seems to be DVB-T2 or tuner-related. Is there something, I can do/test?

Log:
2024-01-03 14:18:07.309 [ INFO]:mpegts: 482MHz in DVB-T Network - tuning on Silicon Labs Si2168 #2 : DVB-T #0
2024-01-03 14:18:07.309 [ INFO]:subscription: 0002: "epggrab" unsubscribing
2024-01-03 14:18:07.309 [ INFO]:subscription: 0004: "scan" subscribing to mux "482MHz", weight: 6, adapter: "Silicon Labs Si2168 #2 : DVB-T #0", network: "DVB-T Network", service: "Raw PID Subscription"
2024-01-03 14:18:12.309 [ INFO]:mpegts: 482MHz in DVB-T Network - scan no data, failed
2024-01-03 14:18:12.309 [ INFO]:subscription: 0004: "scan" unsubscribing
2024-01-03 14:18:13.309 [ INFO]:mpegts: 482MHz in DVB-T Network - tuning on Silicon Labs Si2168 #2 : DVB-T #0
2024-01-03 14:18:13.309 [ INFO]:subscription: 0006: "epggrab" subscribing to mux "482MHz", weight: 4, adapter: "Silicon Labs Si2168 #2 : DVB-T #0", network: "DVB-T Network", service: "Raw PID Subscription"
2024-01-03 14:22:01.985 [WARNING]:epggrab: PSIP: ATSC Grabber - data completion timeout for 530MHz in DVB-T Network
2024-01-03 14:22:01.985 [WARNING]:epggrab: EIT: EPG Grabber - data completion timeout for 530MHz in DVB-T Network
2024-01-03 14:22:01.985 [ INFO]:subscription: 0001: "epggrab" unsubscribing
2024-01-03 14:22:02.986 [ INFO]:mpegts: 562MHz in DVB-T Network - tuning on Silicon Labs Si2168 #1 : DVB-T #0
2024-01-03 14:22:02.986 [ INFO]:subscription: 0007: "epggrab" subscribing to mux "562MHz", weight: 4, adapter: "Silicon Labs Si2168 #1 : DVB-T #0", network: "DVB-T Network", service: "Raw PID Subscription"

Jonas Lang

Here’s an extensive discussion on that particular tuner working in TVH
https://tvheadend.org/d/8359-having-great-difficulty-getting-linux-to-install-and-see-win-tv-dualhd?r=50260

Sebastian Schwarzbrunn

Hi Jonas. Thanks for the quick response.

The posted thread is quite big. I tried to extract the things, that could be directly related to my problem.

What I did so far:

* Set the USB-mode to bulk-transfer (this might not be necessary because it seems like this is done on startup)
* installed the firmware-files from https://github.com/LibreELEC/dvb-firmware as there where errormessages after executing >dmesg | egrep "firmware|dvb|frontend"<
no errormessages regarding the firmware anymore and I get signal-strength displays not in the status page, which was not the case before
* Purged and re-installed TVHEADEND
Still my scan-results are FAIL on every MUX. When I connect my Raspberrypi to the same stick, using the 4.2.8, the scans are successful (updating to 4.3 on the raspberry breaks it.

Any ideas, what I can test or maybe compare?

Best regards, Sebastian

Jonas Lang

What hardware do you have TVH installed on. What source did you use to install TVH. Is this a VM or Docker install

You could possibly compile TVH yourself. Depending on what hardware you have you may need to do this to successfully run a DVBT2 scan.

I have seen reports of problems scanning German DVBT2 muxes. Although 7 years old this thread might provide some insight
https://tvheadend.org/d/4525-search-for-right-dvb-t2-usb-stick-for-german-dvb-t2-hevc-h-265?r=24807

Sebastian Schwarzbrunn

Thanks, I´ll check-out that thread. To quickly answer the question:

It´s an Intel Atom N2800, which is an x64-system. I´ts pretty old, but enough to run TV-Headend.

I´m running Debian 12 and installed TV-Headend, using this how-to: https://tvheadend.org/projects/tvheadend/wiki/AptRepositories. So it´s running without docker or any other virtual stuff.

I´ve tried compiling the 4.2.8. I wanted to try the version, which works on my RaspberryPi4, to verify if this verion also works on the Atom-board. Unfortunately I was not able to compile due to errors I could not resolve.

I have a WinTV HVR4000 installed in parallel, which is working fine. Maybe I could try the WinTV duo without the HVR4000. I´ll check that tomorrow.

Here are the error-messages, I ran into when i tried to compile (https://tvheadend.org/projects/tvheadend/wiki/Building). But I think, a self-compiled version is not necessary in my case.

make[2]: Verzeichnis „/root/source/tvheadend-4.2.8/build.linux/ffmpeg/ffmpeg-3.4.5“ wird verlassen
make[1]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird verlassen
make -f Makefile.ffmpeg libcacheput
make[1]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird betreten
make[1]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird verlassen
make all
make[1]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird betreten
Receiving data/dvb-scan from https://github.com/tvheadend/dtv-scan-tables.git#tvheadend make -f Makefile.hdhomerun libcacheget
make[2]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird betreten
DOWNLOAD misc/staticlib/Debian 12/x86_64/hdhomerun-6bd8f579a6d05cd70238a488f0d955fda4bbbccf.tgz / kZ54ee7ZUvsSYmb9VGSpnmoVzcAUhpBXLq8k
/usr/bin/env: „python“: Datei oder Verzeichnis nicht gefunden
FAILED TO DOWNLOAD (BUT THIS IS NOT A FATAL ERROR! DO NOT REPORT THAT!)
make[2]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird verlassen
make -f Makefile.hdhomerun build
make[2]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird betreten
WGET http://download.silicondust.com/hdhomerun/libhdhomerun_20171221.tgz http://download.silicondust.com/hdhomerun/libhdhomerun_20171221.tgz: 2024-01-04 14:52:07 FEHLER 404: Not Found.
make[2]:* [Makefile.hdhomerun:79: /root/source/tvheadend-4.2.8/build.linux/hdhomerun/libhdhomerun_20171221/.tvh_download] Fehler 8
make[2]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird verlassen
make[1]:* [Makefile:800: /root/source/tvheadend-4.2.8/build.linux/hdhomerun/libhdhomerun/libhdhomerun.a] Fehler 2
make[1]: Verzeichnis „/root/source/tvheadend-4.2.8“ wird verlassen

make:* [Makefile:99: ffmpeg_all] Fehler 2

Jonas Lang

What I could suggest is using these simple copy/paste commands I posted a while back. They were certainly working up to yesterday. Just modify the autobuild configure extra to suit your own purposes https://tvheadend.org/d/8133-tvheadend-build-and-install-on-ubuntu-22-04-64-bit-x86_64-platform-for-beginners

Sebastian Schwarzbrunn

It seems like, it´s not that easy under Debian. As far as I saw, you are using Ubuntu. I´ll grab the Atom330 from my museum and set-up a test-system where I can try it with Ubuntu.
Thanks so far, I´ll post the results / further questions as soon as I have time to build this.

Saen Acro

I'm on older then your Atom an it works no problem with local DVB-T,

but cannot test with T2. I don't have even modulator to simulate T2 Station

As temporary solution scan with https://github.com/stefantalpalaru/w_scan2 or even make "init scan list" for your location

Stop TVH service when scan withW-SCAN2

----


$ neofetch 
       .hddddddddddddddddddddddh.          saen@wafer 
      :dddddddddddddddddddddddddd:         ---------- 
     /dddddddddddddddddddddddddddd/        OS: Alpine Linux v3.16 i686 
    +dddddddddddddddddddddddddddddd+       Host: Uknown 1.0 
  `sdddddddddddddddddddddddddddddddds`     Kernel: 5.15.127-0-lts 
 `ydddddddddddd++hdddddddddddddddddddy`    Uptime: 30 days, 14 hours, 22 mins 
.hddddddddddd+`  `+ddddh:-sdddddddddddh.   Packages: 582 (apk) 
hdddddddddd+`      `+y:    .sddddddddddh   Shell: bash 5.1.16 
ddddddddh+`   `//`   `.`     -sddddddddd   Terminal: /dev/pts/1 
ddddddh+`   `/hddh/`   `:s-    -sddddddd   CPU: Intel Celeron 400MHz (1) @ 400MHz 
ddddh+`   `/+/dddddh/`   `+s-    -sddddd   GPU: 01:00.0 Trident Microsystems CyberBlade/i1 
ddd+`   `/o` :dddddddh/`   `oy-    .yddd   Memory: 27MiB / 486MiB 
hdddyo+ohddyosdddddddddho+oydddy++ohdddh
.hddddddddddddddddddddddddddddddddddddh.                           
 `yddddddddddddddddddddddddddddddddddy`                            
  `sdddddddddddddddddddddddddddddddds`
    +dddddddddddddddddddddddddddddd+
     /dddddddddddddddddddddddddddd/
      :dddddddddddddddddddddddddd:
       .hddddddddddddddddddddddh.

https://www.empowerlaptop.com/p/wafer-c400e2vr-r10/ It runs TVH no problem if have patience to compile it for 3-4 hours ;)

DeltaMikeCharlie

Apologies if you have already looked at these items:

Do you still have any DVB-T1 services? If so, do they scan OK?
Have your mux definitions changed? Are they still valid for DVB-T2 services?

Sebastian Schwarzbrunn

Hey saen acro,

you´ve pointed me exactly into the right direction. With w_scan2, I was able to receive tome data on DVB-T2. And then, I remembered, that I had to use a special file for pre-defined muxes for german DVB-T2 frequencies.
The ones available from TV-Headend seems to not work correctly.
After using this: https://picockpit.com/raspberry-pi/wp-content/uploads/2022/10/aa-All.txt I was now able to get positive scan-results.

This was now on my new Ubuntu-testsytem. I´ll try that trick on the debian-system later, but I think, the channels did the trick.

However, it´s a bit strange, because the only difference is (left->shipped with tv-teadend, right->downloaded):

!channels.PNG!

I´ll do further investigations on that and post the results here.

Saen Acro

You can generate your own init-scan with w-scan2
something as


w_scan2 -c DE -5

Jonas Lang

Most of those predefined mux tables that come with TVH are out of date. As mentioned above best to create your own tables. The w-scan2 tool will do that for you.