ffmpeg-doc 7:4.2.1-2 (armhf binary) in ubuntu focal

 FFmpeg is the leading multimedia framework, able to decode, encode, transcode,
 mux, demux, stream, filter and play pretty much anything that humans and
 machines have created. It supports the most obscure ancient formats up to the
 cutting edge.
 .
 This package contains the HTML documentation for the FFmpeg multimedia
 framework including the API documentation created by doxygen and the manpages
 for the libraries.