[FFmpeg-user] problem ffmpeg with cuda and scale

Michele Salerno mikysal78 at gmail.com
Thu Oct 17 02:08:37 EEST 2019

Il giorno mar 15 ott 2019 alle ore 23:33 Dennis Mungai
<dmngaie at gmail.com> ha scritto:

> For usage, see:
> ffmpeg -h filter=scale_cuda
> On my build, I see:
> Filter scale_cuda
>   GPU accelerated video resizer
>     Inputs:
>        #0: default (video)
>     Outputs:
>        #0: default (video)
> cudascale AVOptions:
>   w                 <string>     ..FV...... Output video width (default "iw")
>   h                 <string>     ..FV...... Output video height (default "ih")
it's ok, i have reinstall OS and compile Driver and Cuda from bin
(NVIDIA-Linux-x86_64-430.50.run and cuda_10.1.243_418.87.00_linux.run)
Compile ffmpeg with
./configure --enable-nonfree --enable-nvenc --enable-libx264
--enable-gpl --enable-cuda --enable-cuvid --enable-cuda-nvcc

> 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

No work, i have this error:
At least one output file must be specified
./1.sh: riga 4: -c:v: comando non trovato

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