Do we want optional dependencies?

Currently, mat2 only has mandatory dependencies. To support videos (!25 (closed) ), we'll need to drag ffmpeg in, and I'm not sure that everyone will be happy to have it as a hard-dependency. For example, ffmpeg is not included in the default repositories of Fedora.

Do we want to implement it as an optional dependency?

changed the description

IMHO, this is fine, as long as we inform users why cleaning an .avi file doesn't work (and what to do about it), in case ffmpeg isn't installed.

mat2 has an optional dependency on ffmpeg since 38df679a.

A message is shown to the user upon cleaning a video file if ffmpeg isn't installed :)

closed