Live TV won't start Root element is missing

[rinnue]

Once the problem begins i can watch previously recorded tv. Scheduled recordings will fail.
I have a Hauppauge Quad TV PCIe tuner. Ihave no IPTV set up it is all ATSC.
I'll reboot the server and post a new log in a bit.
Also, a reboot always fixes the issue. After the reboot it may run fine for a day or two.

OK. I think that every new NextPVR setup includes an "IPTV" tuner by default. I'm not sure exactly why. I think that the "checking: IPTV (http://...)" log messages are a bug and it is using the tuner name from that first tuner rather than the tuner name for actual tuner it's trying at that point.

So it looks like the driver for your Hauppauge Quad TV tuner is dying for some reason. You could try checking the Windows event logs to see if they give any details on why it's dying. You might also check the Hauppauge website to see if you've got the latest drivers installed already.

One other thing you might want to do (this wouldn't affect your problem at all, but would help to reduce clutter in your logs and status screens) would be to disable the unused tuners (the IPTV one and the QAM versions of of the 4 Hauppauge devices) that way NPVR won't keep checking to see if they can be used. To do that go to the Settings | Devices web page. Then press the Ctrl key. That will cause the priority change arrows to get replaced with "Disable" and "Delete". Click the "Disable" for the tuners you aren't using.

I disabled the IPTV and QAM versions.
Hauppauge drivers are current.

[rinnue]

I saw the error on 3 tuners (one wasn't logged) and on live tv and recordings (there were no recordings after a long break)  Check for PCI sleep settings.

Martin

The settings I can find related to pcie sleep or power management are set to Off or Disabled.

[rinnue]

After the changes I've made today, I think it is time to wait and see if the issue happens again. If it does I'll check the Windows logs next. Thanks for all the help.

[rinnue]

Unfortunately, in the last week the problem has occurred twice. I'll check power/sleep settings at the motherboard level next. Also, do you know the name of the windows logs I should check? Thanks

[Graham]

Unfortunately, in the last week the problem has occurred twice.  I'll check power/sleep settings at the motherboard level next. Also, do you know the name of the windows logs I should check? Thanks

Type ... Event Viewer ... into the Windows search box beside the Start button

[rinnue]

Thanks.
Since my last post I have picked through the motherboard settings and windows event viewer. Nothing jumps out at me as a problem.
I tried disabling all Eco friendly settings I could find on the motherboard and in windows.
Still having the same issue. Seems to happen every 36 to 48 hours.
Something interesting I ran in to.  The tuner card has 4 tuners. In Device Manager I see 2 drivers for this card and it seems like one driver for 2 tuners and another driver for the other 2.
I mention this because sometimes I get the error when I'm trying to record just 3 shows. 2 shows are recording fine but I cannot record more. After a reboot I can immediately record 3 or 4 shows. Is it possible that something is grabbing and not releasing one set of tuners?  I only have one client that we use daily. The other is on the backend pc but only gets used for troubleshooting. How can I check what is accessing the tuners? Shouldn't be anything other than NextPvr.
Any thoughts on what to check next?
Thanks

[rinnue]

Since I couldn't see an issue with any windows items I bought a new card.  Same exact issue. Works fine for a couple days and then can no longer stream live tv or record live tv.
In NextPvr logs:
Cannot find capture device, root element is missing.
In windows device manager:
Tuner card status is ok and enabled.

and nothing shows as an issue in the event viewer around the time the live tv streaming failed.

Stopping the NextPvr service and starting it again does fix the situation.

any ideas?

[Graham]

Same exact issue. Works fine for a couple days and then can no longer stream live tv or record live tv.
In NextPvr logs:
Cannot find capture device, root element is missing.
In windows device manager:
Tuner card status is ok and enabled.

device-Hauppauge WinTV 885 ATSC TunerDemod 2-1.log has this ...

2021-01-23 20:57:00.101 [ERROR][5] Unexpected error: System.NullReferenceException: Object reference not set to an instance of an object.
  at Native.DigitalRecorderBase.AttachFrontEnd(String deviceFilter, Int32 deviceInstance, String& message)
  at Native.DigitalRecorderBase.BuildGraph(String deviceFilter, Int32 deviceInstance, Int32 commonInterface, Int32 commonInterfaceInstances, String& message)
  at DeviceHostWindows.Devices.DigitalDevice.StartStream(String tuning, String target, String& reason)
  at DeviceHostWindows.Program.HandleRequest(HttpListenerContext context)

I expect that someone will be along soon who can tell you what is going on.

[mvallevand]

My gut says the problem started when some drivers failed to loads likely becoming a snowball. To me that just means a bad driver or your device as has some sleep setting. Nothing that NextPVR can do since your PC is not going to sleep.

2021-01-23 13:57:00.201 [DEBUG][4] StartStream(): D:\Recorded TV\Find & Design\Find & Design_20210123_14001430.ts
2021-01-23 13:57:00.213 [DEBUG][4] FindFilterByName failed to locate filter: Microsoft Network Provider
2021-01-23 13:57:00.215 [DEBUG][4] FindFilterByName failed to locate filter: Microsoft ATSC Network Provider

Martin

[shatty]

Go BIOS/CMOS level and disable all power management features. I do that on all machines I build as servers. Make a record of your changes just in case it doesnt make a difference and you can change it back. If you need help getting into BIOS, google your MB model and it will tell you what key to press as soon as u power on.