[FFmpeg-user] Ffmpeg Nvenc GPU decode , set hwaccel_device not work

Dennis Mungai dmngaie at gmail.com
Tue Dec 25 08:44:23 EET 2018


On Tue, 25 Dec 2018 at 07:22, dd <unicorok at 163.com> wrote:

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> Very magical with your guide, it works well.
> Thanks a lot for your quickly reply, I am very grateful.
> Merry Christmas!
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> At 2018-12-25 02:35:35, "Dennis Mungai" <dmngaie at gmail.com> wrote:
> >On Mon, 24 Dec 2018 at 21:23, dd <unicorok at 163.com> wrote:
> >
> >> Dear my friend,
> >> We replace cpu with gpu to ffmpeg recently, I set the gpu device no, but
> >> it still use default device 0.
> >> As the following problem Code:
> >> ffmpeg -hwaccel_device 2 -hwaccel cuvid -i a.mp4 -vf
> >> “scale=1080:720,overlay=()” -c:v h264_nvenc out.mp4
> >>
> >>
> >> I found if use “scale_npp” replace  “scale” will work with device 2, but
> >> in that way, we will lost some filter functions
> >> like overlay,suntitles burning,and so on.Is there some parameters of
> >> scale_npp with the same functions?
> >> Or how can I implement add water picture on gpu platform with seted
> device
> >> number?
> >> Linux server has 5 NVIDIA card, i see it use device 0 always by the
> >> nvidia-smi tool.
> >> Hope your help, thank you!
> >
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> >> _______________________________________________
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> >
> >
> >Hey,
> >
> >You must add the -gpu option to ffmpeg, passed to the NVENC encoder(s), as
> >shown below with the example you provided::
> >
> >ffmpeg -hwaccel_device 2 -hwaccel cuvid -i a.mp4 -vf
> >“scale=1080:720,overlay=()” -c:v h264_nvenc -gpu 2 out.mp4
> >
> >That should use the selected device, ie gpu 2.
> >
> >Now, retest and report back.
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Merry Christmas to you too!


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