Bug#893618: please suggest ffmpeg for video reader

[Lumin]

Package: python3-imageio
Version: 2.2.0-1
Severity: minor

When ffmpeg is not installed, running

   reader = imageio.get_reader('imageio:cockatoo.mp4', 'ffmpeg')

will cause the following error:

   NeedDownloadError: Need ffmpeg exe. You can obtain it with either:
  - install using conda: conda install ffmpeg -c conda-forge
  - download by calling: imageio.plugins.ffmpeg.download()

which could be solved by installing ffmpeg.

-- 
Best,