On Debian-based distro (e.g., Debian, Ubuntu or Linux Mint), the package "ffmpeg" has existed as a "transitional" package for libav fork due to some political reason. So if you are trying to install "ffmpeg" package with apt-get, you will actually be installing libav tools, not the original FFmpeg, even when the latter is under active development. Starting from Ubuntu 14.04 (Trusty), the misleading transitional package "ffmpeg" has been removed from base repositories, but the official FFmpeg is still not part of base repositories on Debian-based distros.
If you want to install the original FFmpeg on Ubuntu or Debian, one way is to compile it yourself.
Here is how to compile and install FFmpeg on Ubuntu or Debian.
First, install prerequisites.
Download FFmpeg code, and build it as follows.
$ cd FFmpeg
$ ./configure --enable-nonfree --enable-gpl --enable-libx264 --enable-x11grab --enable-zlib
If build is successful, go ahead and install FFmpeg.
After installation, type "ffmpeg" command to verify the installation.
Troubleshooting during FFmpeg Compilation
1. If you are getting this error while running configure:
"ERROR: Xext not found"
2. If you are getting this error while running configure:
"ERROR: Xfixes not found"
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