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Unsilenceable stutter on crash, and NDigitalHost high CPU use freezing PC

Unsilenceable stutter on crash, and NDigitalHost high CPU use freezing PC
bitoclass
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#1
2015-08-16, 09:48 PM
I've recently switched from Media Center on Windows 8.1 (in hope of upgrading to Windows 10!) and am mostly loving NPVR so far - thank you!

But I have encountered a particular issue a couple of times that has required me to reboot my entire PC to fix it so I thought I'd report it and see if you can help. I attach my logs as requested in case these are useful.

The problem I have been left with a couple of times is that the sound from NPVR (live TV this time, and I think last time too) suddenly gets stuck repeating one tiny fragment of sound, so making an ongoing jarring buzzing sound, and nothing I do shuts it up! I can even launch NPVR again and happily carry on watching TV with sound, but the previous sound stutter continues.

Exacerbating this problem, NPVR doesn't appear at all in the Windows Volume Mixer, as most software does, so I can't mute or otherwise adjust its sound selectively. Muting the items that do appear there makes no difference, but muting the overall ouput to my speakers in there does mute the noise (and everything else!). Only a reboot shuts it up.

Any ideas what could be causing this?

This time, it happened on the second occasion this evening that one of the NDigitalHost processes had suddenly started using a great deal of CPU, making the entire PC freeze up for a second or two at a time, repeatedly, and the sound stutter for the duration of the freeze. Earlier this evening, when I wasn't watching live TV or even had NPVR running as a window itself, this had happened but the computer recovered after perhaps 30 seconds to a minute of this behaviour. This time NPVR was in use for live TV, and it exited without notice or error and the permanent stuttering sound began.

I believe both occurrences of the freezing-up computer/NDigitalHost high CPU use issue this evening happened when NPVR was beginning to record a programme on BBC One (BBC London News). Neither of these recordings has worked - both are 900kB files which dono't play. I'm not sure what the problem is there but presumably it's all related!

My DVB hardware is a BlackGold BGT3600 with dual DVB-S and dual DVB-T tuners. I have lots of channels (including BBC One) set up to use sources from both types of tuner - four sources in total. On the first freezing-up/high CPU occasion this evening, I was already recording a programme on Channel 4 HD when the BBC One recording tried to start. On the second occasion there was no other recording already taking place. In both cases there should clearly have been at least three tuners going spare for recording BBC One from.

My soundcard is an ASUS Xonar D2X. My motherboard is an ASUS P7P55D. I'm on Windows 8.1 32-bit and have more RAM than 32-bit Windows can see (8GB, so it sees about 3GB). If relevant I also have a Modular Technologies PCI DAB radio card installed in the PC but that does not interact with NPVR and was not actively in use at the time of these incidents.

Let me know if you need any other information - thanks!
sub
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Posts: 106,671
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#2
2015-08-16, 09:58 PM
If the sound continues after NextPVR has been killed, then it sounds like it's related to drivers for your soundcard.

You could also try a different audio decoder, in case the one you're currently using is generating some audio samples your device's drivers don't like.

The bit about NDigitalHost.exe using lots of CPU when this happens doesn't really make much sense to me. This process isn't decoding audio or anything. For the most part it's very very little. It just dumps to disk whatever the digital tuner supplies.
sub
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NextPVR HQ, New Zealand
Posts: 106,671
Threads: 767
Joined: Nov 2003
#3
2015-08-16, 10:02 PM
You could also try disabling the 'Update DVB EPG during live tv' checkbox on the Settings->Misc tab, because it can generate some CPU usage while digital devices are running.
bitoclass
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#4
2015-08-16, 10:03 PM
Thanks for this quick response!

That's interesting about the soundcard and decoder - I will look at that.

I think in hindsight the NDigitalHost CPU issue is probably separate - but may have been what caused NPVR to crash (which in turn triggered the sound going wrong).

The NDigitalHost high CPU use appears to have been triggered by NPVR trying to start a new recording from BBC One, in both cases this evening. As I say I think this must be unrelated to the sound issue. Any clues in the logs or anything?

Thanks again!
bitoclass
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#5
2015-08-16, 10:04 PM
Ooh just saw this second reply. Thanks, will try that!
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