libffmpeg-ocaml-dev 0.4.1-1build1 (arm64 binary) in ubuntu focal

 The modules currently available are:
 Av: the module containing demuxers and muxers for reading and
 writing multimedia container formats.
 Avcodec: the module containing decoders and encoders for audio,
 video and subtitle codecs.
 Swresample: the module performing audio resampling, rematrixing
 and sample format conversion operations.
 Swscale: the module performing image scaling and color
 space/pixel format conversion operations.
 Avdevice: the module containing input and output devices for
 grabbing from and rendering to many common multimedia
 input/output software frameworks.
 .
 This package contains all the development stuff you need to develop
 OCaml programs whcich use ocaml-ffmpeg.