Thanks for the writeup, Avram. I'd never invest the time into playing with these tools, but I'll gladly read about your experiences with them.
BTW, the GIFs didn't display until I clicked the "zoom" button, in the corner. Currently using Firefox.
I'm dreading these sorts of videos showing up in more mass media, because I always watch something with the assumption that it's real and the challenge for me as a viewer is to visually parse what's going on. When I know it's not real, I don't stress over anything that doesn't "look right". However, the uncertainty of not knowing whether a video is real or not seems like it could really mess with me.