These are the settings I use (as of December 2019) when making a photo slideshow video—the pictures and music pretty much carry the feel-goodness of the whole presentation.

I like the Ken Burns effect of alternate zooming in and out of picture from one to the next. Give each picture some 4 seconds and when a 2-second transition is added, it will be less at around 2 seconds—just enough to let the audience fixate on a single picture.

Here is the latest video that I made for Jaycelle.