What's the difference between the 3 "Apple Keynotes" podcasts?
In order of increasing quality &amp; size: Regular, HD, 1080p.

iMore forums:


  Normally when a video is referred to as HD. They are talking about
  720p. Which is a slightly lower quality compared to 1080p and if they
  say FHD (Full HD) they are talking about 1080p. I cant give you the
  exact space you need to store the videos since they can vary in
  length. But it could be over 1GB depending on the length.