I'm running the following command on my Ubuntu 20.04
ffmpeg -i input.mp4 -vcodec libx265 -crf 28 -f mp4 output.mp4
I get the statement: Unknown encoder 'libx265'
I installed the encoder with the command sudo apt-get install libx265-dev libnuma-dev but I still get the same message. Do you know what I am doing wrong or how to get ffmpeg to work with this encoder?
I solved it by using
sudo apt-get update -qq && sudo apt-get -y install \
autoconf \
automake \
build-essential \
cmake \
git-core \
libass-dev \
libfreetype6-dev \
libgnutls28-dev \
libsdl2-dev \
libtool \
libva-dev \
libvdpau-dev \
libvorbis-dev \
libxcb1-dev \
libxcb-shm0-dev \
libxcb-xfixes0-dev \
meson \
ninja-build \
pkg-config \
texinfo \
wget \
yasm \
zlib1g-dev
as posted on the website - https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
I understand I was missing an update/some package installations must have changed my previous configuration.
Edit: I ended up getting the same error on a different system. I turned out to have multiple installations of ffmpeg in different locations and the one I was using did not have the required builds. I solved this by removing all installations of ffmpeg (using whereis) and then used the build linked by Gyan in the comments.