[FFmpeg-user] problem ffmpeg with cuda and scale

[Michele Salerno]

Il giorno mar 15 ott 2019 alle ore 23:33 Dennis Mungai
<dmngaie at gmail.com> ha scritto:
>
> On Tue, 15 Oct 2019 at 23:47, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> >
> > Am Di., 15. Okt. 2019 um 22:25 Uhr schrieb Michele Salerno
> > <mikysal78 at gmail.com>:
> >
> > > ffmpeg version 4.1.4 Copyright (c) 2000-2019 the FFmpeg developers
> >
> > This looks old.
> >
> > Carl Eugen
>
> And secondly, if you want the scale_npp filter, you must compile
> FFmpeg from source with --enable-cuda-nvcc option passed to the
> ./configure script. Note that the CUDA SDK must be installed on the
> system you're building and running FFmpeg on.
>
> Since you have nvenc present and enabled, you should be able to use
> the scale_cuda filter, yadif_cuda, thumbnail_cuda and hwupload_cuda
> filters respectively as they're dependent on the ffnvcodec headers
> package needed to enable the NVENC feature set.
>
> For usage, see:
>
> ffmpeg -h filter=scale_cuda
>
Unknown filter 'scale_cuda'.

> So with your command, substitute scale_npp with scale_cuda as shown:
>
> #!/bin/bash
> for i in *.mp4; do
>     ffmpeg -threads 8 -hwaccel nvdec -i "$i" -vf scale_cuda=720:-1
> -c:v h264_nvenc -preset slow "convert/$i";
> done
>
> NVDEC should be available on your platform as ffmpeg was configured
> with the aforementioned ffnvcodec header package.
> Note the thread count limit I've added to the command above, as nvdec
> will warn you on high thread counts exceeding ~16.
>
thanks.