NPVR stopped detecting RTL2838 DVB-T

[spasiklas]

Hello,

A couple of weeks ago I installed NextPVR on Ubuntu 18.04 and it worked normally for a couple of days, but at some point the tv tuner disappeared from the Devices list.

I can still use the same tv tuner with Kaffeine (on the same computer) and it works ok.

I removed NextPVR (with apt purge) and installed it again today, only to find out that NextPVR does not detect it, again (but the web UI works).

lsusb returns Bus 001 Device 004: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T

I also saw this in the log

Code:

[...startup]
2019-10-19 20:44:12.760    [DEBUG][1]    No /var/opt/nextpvr/scripts/PreStartup.sh
2019-10-19 20:44:12.771    [DEBUG][1]    Checking if upgrade required
2019-10-19 20:44:12.773    [DEBUG][1]    master file is /opt/nextpvr/system/data/Config-master-dont-edit.xml
2019-10-19 20:44:12.780    [DEBUG][1]    Doing database updates
2019-10-19 20:44:12.781    [DEBUG][1]    Database: /var/opt/nextpvr/npvr.db3
2019-10-19 20:44:12.847    [INFO][1]    Version 5.0.0.191018
2019-10-19 20:44:12.966    [DEBUG][1]    CaptureSource.LoadAll()
2019-10-19 20:44:13.625    [DEBUG][1]    []
2019-10-19 20:44:13.648    [DEBUG][1]    HDHR Discover
2019-10-19 20:44:14.608    [DEBUG][1]    Local Devices: <devices>

2019-10-19 20:44:14.650    [ERROR][1]    Unexpected error scanning for other devices: System.Xml.XmlException: Unexpected end of file has occurred. The following elements are not closed: devices. Line 2, position 1.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
   at System.Xml.XmlTextReaderImpl.ThrowUnclosedElements()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.XmlLoader.LoadNode(Boolean skipOverWhitespace)
   at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)
   at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
   at System.Xml.XmlDocument.Load(XmlReader reader)
   at System.Xml.XmlDocument.LoadXml(String xml)
   at NShared.Visible.CaptureSource.UpdateDevices(ICaptureSourceUpdateStatus callback)
2019-10-19 20:44:17.011    [DEBUG][1]    CaptureSource.LoadAll()
2019-10-19 20:44:17.028    [INFO][1]    Using in-progress RecordingService
2019-10-19 20:44:17.030    [INFO][1]    RecordingService.Startup()
2019-10-19 20:44:17.034    [DEBUG][9]    PowerManagement CancelWakeup (needs implementation)
2019-10-19 20:44:17.040    [DEBUG][9]    Requesting wake up for 'EPG-UPDATE' [EPG Update] at

and sudo systemctl status nextpvr-server returns this
server.sh[925]: ERROR: Open frontend0 failed

[mvallevand]

Make sure Kaffeine isn't holding the device open. If you run

/opt/nextpvr/system/DeviceHost/x64/DeviceHostLinux -discover

do you see any additional messages?

Martin

[spasiklas]

Make sure Kaffeine isn't holding the device open.  If you run

/opt/nextpvr/system/DeviceHost/x64/DeviceHostLinux -discover

do you see any additional messages?

Martin

Thank you for your reply. This is the output

Code:

~$ /opt/nextpvr/system/DeviceHost/x64/DeviceHostLinux -discover
<devices>
  <device>
    <name>adapter0 (Realtek RTL2832 (DVB-T))</name>
    <type>DVB-T</type>
    <filter>adapter0</filter>
    <instance>1</instance>
    <resource>adapter0</resource>
  </device>
  <device>
    <name>adapter0 (Realtek RTL2832 (DVB-T))</name>
    <type>DVB-C</type>
    <filter>adapter0</filter>
    <instance>1</instance>
    <resource>adapter0</resource>
  </device>
</devices>

I did sudo apt purge kaffeine && sudo systemctl restart nextpvr-server but the issue persists.
Is there a way to check if there is another app holding it open? (although I don't think that I have any other apps that could be using it)

[mvallevand]

If you get that output then the tuner is not locked, however your earlier snippet showed it locked when the server started. Do you still get that error on a restart?

Martin

[spasiklas]

If you get that output then the tuner is not locked, however your earlier snippet showed it locked when the server started.  Do you still get that error on a restart?

Martin

Yes, the only device is IPTV, nothing else.

/opt/nextpvr/system/DeviceHost/x64/DeviceHostLinux -discover
still shows the device but the web ui does not

Code:

[ERROR][1]    Unexpected error scanning for other devices: System.Xml.XmlException: Unexpected end of file has occurred. The following elements are not closed: devices. Line 2, position 1.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
   at System.Xml.XmlTextReaderImpl.ThrowUnclosedElements()
   at System.Xml.XmlTextReaderImpl.ParseElementContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.XmlLoader.LoadNode(Boolean skipOverWhitespace)
   at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)
   at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
   at System.Xml.XmlDocument.Load(XmlReader reader)
   at System.Xml.XmlDocument.LoadXml(String xml)
   at NShared.Visible.CaptureSource.UpdateDevices(ICaptureSourceUpdateStatus callback)

This error is still here

[mvallevand]

Are your /dev/dvb/adaptor devices in the video group? If so can you check to see if nextpvr (the user the deb installer created for the server) is also in video ie:

getent group video

Martin

[spasiklas]

Are your /dev/dvb/adaptor devices in the video group?  If so can you check to see if nextpvr (the user the deb installer created for the server) is also in video ie:

getent group video

Martin

Code:

~$  getent group video
video:x:44:nextpvr

I have followed this in order to setup the folders but I haven't done anything for the device.

How do I add it to the video group?

[mvallevand]

Normally the devices are added to the video group when they are installed but you can confirm

ls -lt /dev/dvb/adapter0

Martin

[spasiklas]

Normally the devices are added to the video group when they are installed but you can confirm

ls -lt /dev/dvb/adapter0

Martin

This is the output, not sure about what it means

Code:

~$ ls -lt /dev/dvb/adapter0
total 0
crw-rw----+ 1 root plugdev 212, 1 Οκτ  20 01:26 dvr0
crw-rw----+ 1 root plugdev 212, 3 Οκτ  20 01:26 frontend0
crw-rw----+ 1 root plugdev 212, 2 Οκτ  20 01:26 net0
crw-rw----+ 1 root plugdev 212, 0 Οκτ  20 01:26 demux0

[mvallevand]

It means that you probably can't access it with nextpvr. Maybe try

sudo usermod -a -G plugdev nextpvr

Martin