title: How to transition smoothly and repeatedly between two videos using a command line tool on Ubuntu?
body: <p>At first glance, this problem seems like it should be easy to solve, but I'm having difficulty locating the right solution on Ubuntu. I simply want to output a video using two videos as input, where these two videos fade into each other in a smooth and repetitive manner, every second or so. Would I be able to use something like ffmpeg for this task? If not, what's a typical efficient path to this goal?</p>