Impl output to video, update program args

Impl output to video, update program args

Turns out output to video suffers from loss of quality problems when in
color (not grayscale). It may be better in some cases to just output
each frame as a png and combining them later with ffmpeg like how it is
mentioned here: https://trac.ffmpeg.org/wiki/Slideshow . Grayscale video
is noticably better, but both cases result in large video sizes, so care
may be needed if free disk-space is sparse.