I alluded to this in another thread in this forum. Recording a lecture, of just a monologuist in front of a camera, will take up at least the time it takes to deliver the lecture. But preparation of the set, like lighting, camera placement and focus, takes enough time on its own, plus any post-production, like editing false starts or lost tracks. and if there were enhancements, like cuts to close ups of demos, there is even more time invested. And wisely. The students need to see something that works right and is easy on the eyes or they are not coming back for a second look. There needs to be a decent level of presentation, which I find sorely lacking when I look at some much of the YouTube stuff. It is rare to find things well done. So flipping a class would probably take the same amount of time to prepare it as to teach it. If administration does not see that the teacher needs to be compensated for the time put in, and not on their own dime, most would be reluctant to proceed. I used to be full-time, now adjunct, and I would not flip a class unless I got paid for the time I would have to invest outside of the F2F meetings as I have other money-making schemes to attend to. But I would jump at the chance to write an electronic textbook implementing flipped lesson if the price were right. I have a Master of Education in Technology in Education and plenty of photography experience, if anyone is listening!