GPU / VE (44%, 20%) (low usage, not at maximum)???

[zerowalkx]

Hi, rigaya

It's normal that you don't use 100% on the GPU and the VE ? I mean it's normal that this varies a lot ? sometimes it's 50% sometimes it's more and less, on other occasions.etc, is there any way to control this or depends on the video source ?

or I need to activate some option, and accelerate to use 100 % or as close to this maximum speed ?

For example in Avisynth+ I have to add at the end in the script: Prefetch(16)

with this option in Avisynth+ I can use the 16 threads that my processor has, it uses 100% of the capacity of the processor. and the encoding is finished much faster.

Here in NVEncC we have to activate some option to increase the speed and use 100% of the GPU and VE ?

Thank you very much for your help

[rigaya]

Most of the time, especially for encoding a video smaller than fullHD (1920x1080), it is quite difficult to achieve 100% VE usage using Avisynth input, and usually requires hardware decoding to be enabled.

This can be used by using "--avhw" option and directly setting the target video file as input. If you require video editing by Avisynth+, it'll be difficult to fully utilize the VE.

[zerowalkx]

Most of the time, especially for encoding a video smaller than fullHD (1920x1080), it is quite difficult to achieve 100% VE usage using Avisynth input, and usually requires hardware decoding to be enabled.

This can be used by using "--avhw" option and directly setting the target video file as input. If you require video editing by Avisynth+, it'll be difficult to fully utilize the VE.

As I understand your answer is better to use the option --avhw as input directly, and not to use the Avisynth ?

could you please make an example of how it would be :

C:\ENCODE\0-NVEnc\Nvenc\NVEncC64.exe -i "C:\ENCODE\0-NVEnc\Led-Zeppelin.avs" --vpp-resize spline64 --crop 0,0,0,0 --output-res 0x0 --codec h265 --output-depth 10 --preset quality --level 5.1 --tier high --ref 7 --bframes 12 --mv-precision Q-pel --cqp 20 --vbv-bufsize 5000 --max-bitrate 5000 --aq --bref-mode each --lookahead 32 --deblock --strict-gop --chromaloc 2 --aud --sar 1:1 -o "Led-Zeppelin.mkv" --log Led-Zeppelin.log

Thanks for your help

Please check this link , thanks so much is very important :)

https://github.com/rigaya/NVEnc/issues/161

[iykkim]

Just FYI. I'm also doing lot of encoding with nvencc64 as situation below;

• Mpeg2 FullHD source to HEVC FullHD
• H.264 FullHD source to HEVC FullHD
• HEVC 4K source to HEVC 4K: In this case, I only decrease video bitrate around to 30 Mbps from 4K bluray rip source for decrease size and keep exact same quality as ripped source.

VE utilization and encoding fps that I experiencing are;

• Mpeg2 to HEVC FullHD: About 45%, 240 fps
• H.264 to HEVC FullHD: About 45%, 140 fps
• HEVC to HEVC 4K: About 45%, 69 fps

When I doing dual encoding ( you know, Nvidia GTX has dual nvenc encode chipset so it can run 2 encode jobs simultaneously ) then;

• Mpeg2 to HEVC FullHD: About 85%, 210 fps
• H.264 to HEVC FullHD: About 85%, 130 fps
• HEVC to HEVC 4K: About 85%, 58 fps

It's my assumption that VE utilization showing for overall of nvenc chipset usage so if you just doing single encoding then it will not over 50% as it will use only one nvenc encode chipset of GTX adapter. And I also agree to rigaya's reply above as it will not use all 100% for encode only. And Nvidia GTX adapter seems utilize enough of nvenc chipset resource when encoding.

I'm not a technical expert of Nvidia so just can say in my experience and I think more technical answer can be done by Nvidia support/forum...

Below image is single HEVC 4K encoding job capture. You can see that VE utilization is 48% and 72fps encoding speed in this one. This seems almost full usage of one of encode chipset resource of Nvidia GTX adapter.

Below capture is one of dual Mpeg2 FullHD to HEVC FullHD encoding screen. As you can see VE utilization increased around 85%.

[pwacooijmans]

Basicly to get higher GPU and VE usage you need a faster CPU with more threads etc etc....it just means your graphics card is not the bottle neck

[pwacooijmans]

Secondly your graphics card does NOT support B-frames so you better set bframes to 0. Third ref can't be 0. https://developer.nvidia.com/video-encode-decode-gpu-support-matrix#Encoder here a link to check weather your card supports b frames or not.

[Aesthermortis]

This happens to me when both the Intel and Nvidia GPUs are active. For example, when using a laptop with the integrated screen, NVENC does not show any GPU activity. However, when I connect the HDMI and the laptop uses the Nvidia GPU for the display instead of the Intel one, it does show GPU activity during encoding.