What kind of video is required in a course?

Hi. I'm busy with my first course, which, I think, meets most/all Udemy's basic requirements. However, it has just struck me: do the videos all have to have a human in them? There are six sections with five or so lessons each, all of which are powerpoints converted to video, with voice overs (and images).
At the moment, each section has a human video intro and outro, but these aren't 30 minutes in total. If video with voice overs counts for the minimum video purposes, that's great, but I want to be sure before completing and submitting anything.
Thanks for the help.
Jan
Answers
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there are no rule about showing your face on video, you can go with PowerPoint video
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Make sure you appear in the your promo video and the free previews. This will help introduce you to students.
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@Janbud I guess the best strategy would be to start every video lesson with a talking head that is you and just as you get to explain the topic details switch to presentation and your audio in the background and when the lesson is at the end and you are concluding the topic you may re-appear as talking head in the video. I have tried this format recently and still getting feedback from the students. However, this format looks logical.
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The difficulty with the question is that you are asking about the minimum critical specifications. That is not a mindset that succeeds in a highly competitive marketplace. Why not ask what you need to do to make your course the best in its category.
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Thanks, everyone, for your helpful comments, which are much appreciated. The first project is often a steep learning curve, albeit a pleasant one in the case of Udemy. Can't wait to get it all delivered…
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