High CPU usage with Npvr even on idle

[Elanus]

Hi,

I recently installed NextPVR 2.1.5 and the current patches to take advantage of the aspect ratio options it has available to remove letterbox aspect ratio on 16:9 broadcasts my TV operator puts in their signal. I noticed some lag using analog input, then I realized NPVR has a CPU usage of 45-55%. I Tested all combinations of the decoders and renderers available for video and audio but the CPU Usage did not change.

When I stop the playback and NPVR idles the CPU usage is 50% for that process, but interestingly, when I open the Settings dialog CPU Usage drops to 10-15% even with the program showing analog TV. What can be causing this?

I currently use Cyberlink PowerCinema 6 and its CPU usage using post-processing is about 6-8%

My system:
Tuner Pegatron TV7160E analog, made by Asus for HP
AMD Athlon II X2 255
2 Gb RAM DDR2 667 MHz
ATI HD 4670 1Gb DDR3 with latest drivers
I'm running Windows 7 32bits Professional

[sub]

The usual reason for this the DirectX runtime not being installed. If you can post the npvr.log I can confirm if that is the case.

[Elanus]

Hi, thanks for the quick response. Here are the logs.

One more thing, I use a set top box connected by coaxial cable and composite AV, I prefer to use composite because it has slightly better quality. While I opened the program to create the logs the playback for Analaog TV using composite input, only showed static, but the cable (coaxial) input worked as usual. This happened a couple of times before, maybe in the logs there is some hint about this too.

Thanks for the help.

[sub]

Unfortunately I cant see any obvious reason for high CPU in those logs.

[Elanus]

Ok, but do you think there is something else I can do to help with this issue?

[sub]

Does the high CPU start pretty much straigh when you launch nextpvr.exe? ie, even if just left at the main menu?

[Elanus]

I just realized that this problem only occurs inf I set the program to "TV Viewer" in the settings dialog.

When I have it configured that way, windows reports a CPU usage of 50% as soon as I open it, but If i set it to "PVR" the CPU usage does not go above 10% while it is on the main menu or playing TV.

Well maybe this can help reproduce the issue.

[mikeh49]

Same here FWIW if TV Viewer is selected (much less than 10% when in PVR mode). When started in TV Viewer I get a black screen. Then right-click and select Live TV or a channel from the list. CPU is 50% with the black screen (80% on one core and 20% on the other) and about 60% when playing a channel (30% on each core).

[jcjefferies]

I am just setting up a new Vista server to replace my old XP server. Everything seems to be working but I just noticed that NPVR.exe is running at 32% at rest and is caused by DirectX. If I go to NPVR settings it randomly sometimes shows the Direct X warning and other times doesn’t. If it shows the warning then the processor runs at around 32%, but if next time you do it there is no warning then the processor immediately drops to almost zero. The same thing happens if I install a different video card.

I have tried to install the Web install of Direct X9c but it fails. Looking at the error log it seems to fail because a later version is already installed.

[sub]

I've found the cause of this high CPU when configured for TV Viewer mode, and have fixed it for the next release. It also fixes high CPU usage when running on machines with DirectX not available.