[FFMPEG] how to exploit all available GPUs ?

PatchWorKs · 25th July 2024, 08:24

Hi there, I've recently tested encoding performances on an a friend's MSI Stealth GS77 - 12U laptop: when the process was done with one of the GPUs, the other remained unused - although it still consumed some power (neither goes totally idle) and of course produce heat - and vice versa.

As for the title: how - if possible - write a command line to assign the Intel iGPU to decode source video stream and Nvidia dGPU to the encoding workload only (and, why not, vice-versa) ?

Thanks in advance to anyone that can/will help.

Emulgator · 25th July 2024, 13:16

This is maybe done first in BIOS (enable MSI Hybrid), then in Windows Graphic settings: Hardware Accelerated GPU On (means nVidia), then assign apps. Here on a hybrid iGPU/dGPU system (Clevo) it more or less works.

GeoffreyA · 25th July 2024, 13:56

I've only got a single GPU (Vega on Raven Ridge), but the following used the GPU for both decoding and encoding:

Code:

ffmpeg -hwaccel d3d11va -i INPUT.mp4 -c:v hevc_amf OUTPUT

Of course, that is AMD's encoder. I can't test this but give the following a go and see what happens:

Code:

ffmpeg -hwaccel d3d11va -i INPUT.mp4 -c:v h264_nvenc OUTPUT
ffmpeg -hwaccel qsv -i INPUT.mp4 -c:v h264_nvenc OUTPUT

25th July 2024, 08:24	#1 \| Link
PatchWorKs Registered User Join Date: Aug 2002 Location: Italy Posts: 312	[FFMPEG] how to exploit all available GPUs ? Hi there, I've recently tested encoding performances on an a friend's MSI Stealth GS77 - 12U laptop: when the process was done with one of the GPUs, the other remained unused - although it still consumed some power (neither goes totally idle) and of course produce heat - and vice versa. As for the title: how - if possible - write a command line to assign the Intel iGPU to decode source video stream and Nvidia dGPU to the encoding workload only (and, why not, vice-versa) ? Thanks in advance to anyone that can/will help. __________________ Hybrid Multimedia Production Suite will be a platform-indipendent open source suite for advanced audio/video contents production. Official git: https://www.forart.it/HyMPS/

25th July 2024, 13:16	#2 \| Link
Emulgator Big Bit Savings Now ! Join Date: Feb 2007 Location: close to the wall Posts: 1,671	This is maybe done first in BIOS (enable MSI Hybrid), then in Windows Graphic settings: Hardware Accelerated GPU On (means nVidia), then assign apps. Here on a hybrid iGPU/dGPU system (Clevo) it more or less works. __________________ "To bypass shortcuts and find suffering...is called QUALity" (Die toten Augen von Friedrichshain) "Data reduction ? Yep, Sir. We're that issue working on. Synce invntoin uf lingöage..." Last edited by Emulgator; 29th July 2024 at 21:54.

25th July 2024, 13:56	#3 \| Link
GeoffreyA Registered User Join Date: Jun 2024 Location: South Africa Posts: 50	I've only got a single GPU (Vega on Raven Ridge), but the following used the GPU for both decoding and encoding: Code: ffmpeg -hwaccel d3d11va -i INPUT.mp4 -c:v hevc_amf OUTPUT Of course, that is AMD's encoder. I can't test this but give the following a go and see what happens: Code: ffmpeg -hwaccel d3d11va -i INPUT.mp4 -c:v h264_nvenc OUTPUT ffmpeg -hwaccel qsv -i INPUT.mp4 -c:v h264_nvenc OUTPUT

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