How To Install FFmpeg In Linux for Stackpost
And it seems that you will need to install ffmpeg. To Stackposts can working Stable you need follow by this steps to installing FFMPEG. This project will be run on Windows and Linux computers.

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FFmpeg is one of the best multimedia frameworks that can be used to encode, decode, transcode, mux, demux, record, stream, filter, and play any type of media files. It is a completely free multimedia framework that works on almost all operating systems, including Linux, Mac OS X, Microsoft Windows, the BSDs, Solaris, etc.
Install FFmpeg In Linux
FFmpeg is packaged for most Linux distributions and is available in the default repositories. Here are installation instructions for popular Linux distros.
1. Install FFmpeg on Arch Linux and its derivatives
FFmpeg is available in the default repositories of Arch Linux. You can install it using the command:
$ sudo pacman -S ffmpeg
The latest development version is available in the AUR. , so you can install it using any AUR helpers, for example, Yay.
$ yay -S ffmpeg-git
There is also ffmpeg-full package in AUR, which is built with as many optional features enabled as possible. You can install that too if you want.
$ yay -S ffmpeg-full-git
2. Install FFmpeg on Debian
FFmpeg is available in the default repositories. Open your Terminal and run the following command to install it.
$ sudo apt-get install ffmpeg
3. Install FFmpeg on Ubuntu and its derivatives
In Ubuntu, FFmpeg is available in the official repositories, so you can install it using command:
$ sudo apt-get install ffmpeg
FFmpeg in the official repositories might be bit outdated. To install the most recent version, use the FFmpeg PPA.
$ sudo add-apt-repository ppa:mc3man/trusty-media
$ sudo apt-get update
$ sudo apt-get dist-upgrade
4. Install FFmpeg on Fedora, RHEL, CentOS
FFmpeg can be installed via EPEL and RPM Fusion repositories on RPM-based distributions, such as RHEL, Fedora, CentOS.
First, Add EPEL repository using the command:
$ sudo dnf install epel-release
Add RPM Fusion repository as shown below depending upon the distribution you use:
To enable access to both the free and the nonfree repository use the following command:
Fedora 22 and later:
$ sudo dnf install https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
RHEL 8.x and compatible systems:
$ sudo dnf install --nogpgcheck https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
$ sudo dnf install --nogpgcheck https://mirrors.rpmfusion.org/free/el/rpmfusion-free-release-8.noarch.rpm https://mirrors.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-8.noarch.rpm
RHEL 7.x, CentOS 7.x:
$ sudo yum localinstall --nogpgcheck https://mirrors.rpmfusion.org/free/el/rpmfusion-free-release-7.noarch.rpm https://mirrors.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-7.noarch.rpm
The above commands will install both free and non-free repositories.
After enabling EPEL and RPM Fusion repositories, run the following command to install FFmpeg:
$ sudo dnf install ffmpeg ffmpeg-devel
Or,
$ sudo yum install ffmpeg ffmpeg-devel
5. Install FFmpeg in openSUSE
Enable Packman repository on your openSUSE system.
If you're using openSUSE Tumbleweed edition, run the following command to enable Packman repository:
$ sudo zypper addrepo -cfp 90 'https://ftp.gwdg.de/pub/linux/misc/packman/suse/openSUSE_Tumbleweed/' packman
On openSUSE Leap:
$ sudo zypper addrepo -cfp 90 'https://ftp.gwdg.de/pub/linux/misc/packman/suse/openSUSE_Leap_$releasever/' packman
Refresh the repository database:
$ sudo zypper refresh
Finally, install FFmpeg on openSUSE using the command:
$ sudo zypper install --from packman ffmpeg
! Congratulations! You have successfully installed FFmpeg on your Linux box.
To verify the FFmpeg version, run
$ ffmpeg -version
Sample output:
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (GCC)
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' -I/usr/include/rav1e' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librav1e --enable-libsmbclient --enable-version3 --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-version3 --enable-vapoursynth --enable-libvpx --enable-vulkan --enable-libglslang --enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2 --enable-libzimg --enable-libzvbi --enable-lv2 --enable-avfilter --enable-avresample --enable-libmodplug --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-lto --enable-libmfx --enable-runtime-cpudetect
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
libpostproc 55. 9.100 / 55. 9.100
To print FFmpeg help section:
$ ffmpeg -h
Display FFmpeg man page:
$ man ffmpeg