[FFmpeg-user] problem ffmpeg with cuda and scale

[Dennis Mungai]

On Wed, 16 Oct 2019 at 01:14, Michele Salerno <mikysal78 at gmail.com> wrote:
>
> 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.

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