Hello, Motitz

 See the output of the command:

 root@darkstar:~# ffmpeg -codecs | grep libvpx
ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.5.0 (GCC)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64
--docdir=/usr/doc/ffmpeg-3.2.4/html --mandir=/usr/man --disable-debug
--enable-shared --disable-static --enable-gpl --enable-version3
--enable-avresample --arch=x86_64 --enable-libfontconfig
--enable-libfreetype --enable-libfribidi --enable-gnutls --enable-libcaca
--enable-libcdio --enable-libspeex --enable-libssh --enable-libtheora
--enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264
--enable-libmp3lame --enable-opengl --enable-libopenjpeg --enable-libpulse
--enable-libsmbclient --enable-libwavpack --enable-x11grab
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
 DEV.L. vp8                  On2 VP8 (decoders: vp8 libvpx ) (encoders:
libvpx )
 DEV.L. vp9                  Google VP9 (decoders: vp9 libvpx-vp9 )
(encoders: libvpx-vp9 )

 However, when trying to record on the simplescreenrecorder the error
appears:

[VideoEncoder::PrepareStream] Usando formato de pixel yuv420.
[libvpx @ 0x129dd00] v1.5.0
[libvpx @ 0x129dd00] Failed to initialize encoder: ABI version mismatch
[BaseEncoder::Init] Erro: Não foi possível abrir o o codec!
[PageRecord::StartOutput] Erro: Ocorreu um erro durante a inicialização.

Thanks
*César Murilo da Silva Júnior*
*Téc. Oper. Monit. Computadores Help Desk | Redes e Segurança*
*UNIPAM - Centro Universitário de Patos de Minas*
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Em seg., 29 de jun. de 2020 às 07:07, Moritz Barsnick <barsn...@gmx.net>
escreveu:

> On Sun, Jun 28, 2020 at 22:40:39 -0300, CESAR MURILO DA SILVA JUNIOR wrote:
> > I use OS Slackware 14.2, and for it there is libvpx 1.5.0. Which version
> of
> > ffmpeg is supported?
>
> ffmpeg has supported libvpx 1.5.0 for a very long time, and still does.
>
> > I currently have ffmpeg 3.2.4 and wanted to record
> > video with the simplescreenrecorder version 0.4.2, but says that the
> > library is not compatible with the codec.
>
> Who says that, and what does it say?
>
> ffmpeg needs to be compiled with support for libvpx. Perhaps yours
> isn't, but I cannot guess without more detail.
>
> If simplescreenrecorder uses the same ffmpeg libraries as your ffmpeg
> command line tool, you can check with
> $ ffmpeg -codecs
> and check whether libvpx is listed.
>
> (ffmpeg 3.2.4 is very old. If simplescreenrecorder supports anything
> recent, please try to use a new version of ffmpeg.)
>
> Moritz
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