In the last post I showed an animated gif of the of the post source run through sent.
This gif was super easy to make manually, I ran sent on the post source file, then I ran my screenshot tool from dmenu on each slide. I stepped through each slide manually.
For a long presentation, or if I might do this more often I would probably automate this in some way.
I was left with a directory of files call 1.png, 2.png, for each of the slides. I used the convert tool from imagemagick to turn these into an animated gif.
$ convert -delay 100 -loop 0 *.png sent.gif
Animated gifs can be played with the animated tool from imagemagick to see how the delay is working.