RPi4, Hauppauge dualHD - Channel Scan returns no data

[mikeh28]

Hello.

I am trying to use V5 of NextPVR in Docker with a RPi4, Hauppauge dualHD USB and USB connected hard disk for tv and config file storage all under latest LibreELEC.

Docker command (but on one line):
docker run -d \
--volume /var/media/htpc-disk-1/npvr/config:/config \
--volume /var/media/htpc-disk-1/npvr/recordings:/recordings \
--volume /var/media/htpc-disk-1/npvr/buffer:/buffer \
--publish 8866:8866 \
--device /dev/dvb:/dev/dvb \
nextpvr/nextpvr_arm32v7:latest
 
Then into the NPVR web interface on 8866. Then Settings/Devices after the login. DVB-T adapters 0&1 show up but when I do a Scan Channels on UK-Rowridge no channel information is returned. Is this expected behaviour for my setup and NPVR V5 or am I doing something wrong? Logs attached, just in case.
 
The DualHD works fine under TVHeadend/Kodi on the RPi4.  
 
Any help much appreciated. 

- Mike

[mvallevand]

What is the tuning file you used for TVH?

Martin

[sub]

Unfortunately we've found the tuning tables supplied with Linux are often out of date or just plain incorrect. You should watch the frequencies it's scanning, and check they're correct for your area. If they're not - let us know what frequencies your local transmitters used, and we'll see if we can find another tuning file for you to choose.

[mvallevand]

Right the on git is 2018 https://git.linuxtv.org/dtv-scan-tables....k-Rowridge and and is way ahead of the 2014 file in the debian repo (not sure what you use with Docker)

I have been thinking of using the file in the buster repo with the deb installer since it is two years newer or maybe even the one from the tvheadend repo.

Martin

[mikeh28]

Hello again.
Thank you very much for your prompt replies yesterday.

Just for completeness in this thread, the LibreELEC Pi4 TVHeadend location of the Channel Scan files is:
~/.kodi/addons/service.tvheadend42/dvb-scan/dvb-t/uk-Rowridge
As you say, these are from 2018-05-07.

From your "nextpvr/nextpvr_arm32v7:latest" Docker build, the Channel Scan files are in:
usr/share/dvb/dvb-t/uk-Rowridge
usr/share/dvb/dvb-legacy/dvb-t/uk-Rowridge
As you say, they are from 2014-03-25.

Current UK-Rowridge from https://ukfree.tv/transmitters/tv/Rowridge
PSB1 BBCA C24  (498.0MHz)
PSB2 D3+4 C27  (522.0MHz)
PSB3 BBCB C21+ (474.2MHz)
COM4 SDN  C25  (506.0MHz)
COM5 ArqA C22+ (482.2MHz)
COM6 ArqB C28  (530.0MHz)
LSO      C29  (538.0MHz)
com7      C55  (746.0MHz)
com8      C56  (754.0MHz)

The TVHeadend42 2018-05-07 entries cover the correct channels above apart from:
TVHE = c37L-SOT 602.0MHz but is not in current Rowridge channels above (but entry still allows TVHE scan ok).

So, as you say, looks like the 2014 file in the current armv7 build is sadly very out of date. I'm also not sure that there is a close match in the 2014 scan file either. So, do you have any plan to replace the channel scan file (with at least a 2018 version) in your next release or is there a trick I can use to getting a scan file into the Docker container in the interim?

Many thanks for your help.

- Mike

[mvallevand]

I'm not sure if you can override the the

--volume /usr/share/dvb/dvb-t:/usr/share/dvb/dvb-t \

but I'd start there.

If that fails open

in LE

cp /usr/share/dvb/dvb-t/uk-Rowridge /var/media/htpc-disk-1/npvr/config

run bash into docker again and then

cp /confiig/uk-Rowridge /usr/share/dvb/dvb-t/uk-Rowridge

Martin

[mikeh28]

Hello again.

Just to update on this query. I did a fresh install of LibreE, docker etc.

Used the standard "docker exec -ti <containerid> bash" to get into the container.

As you suggested, copied a correct uk-Rowridge file across through the /confg mount route into /usr/share/dvb/dvb-t. Then into the 8866 port to do a Channel Scan with the updated file. Scan process finished but still no channel data, sorry.

Interestingly, on this first clean scan, there were two extra channels scanned 714000000 and 674000000 - neither are in the Rowridge file! On a repeat scan, they did not show up again.

I then deleted everything from the dvb-t directory apart from the Rowridge file. The drop-down menu correctly picked up only this file, but no difference in outcome sadly.

Looking generally at the logs, it seems like the program loops on each frequency - could it be that the data is not being returned correctly from this action somehow. However, I know nothing!

Many thanks for any help you can provide.

- Mike

[sub]

Interestingly, on this first clean scan, there were two extra channels scanned 714000000 and 674000000 - neither are in the Rowridge file! On a repeat scan, they did not show up again.

In the information transmitted on each frequency is a table called the NIT, which carries a list of frequencies used in that area. Those extra frequencies will be from that.

I then deleted everything from the dvb-t directory apart from the Rowridge file. The drop-down menu correctly picked up only this file, but no difference in outcome sadly.

Looking generally at the logs, it seems like the program loops on each frequency - could it be that the data is not being returned correctly from this action somehow. However, I know nothing!

Try using the dvbv5-scan utility to see if it can find your channels. If that works, then NextPVR should work. This utility is the official scan utility from linuxtv.org, and NextPVR is modeled on it.