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(1) video internal and self-contained in a book adds a great number of megabytes to the book's size, but with a good ebook reader it will play and has sound and can even show start/stop/volume controls. (2) Alternately, ou can reference the actual file of the video to an external source, but his requires a connection while reading, although the file size of the book itself is kept small. (3) You can insert an animated GIF, perhaps looping continuously, for a short demonstration video, but it will be soundless. If the number of frames is relatively low and if the resolution of the individual pictures are reasonable the size of the book is kept within normal parameters. (4) A nice option is to use CSS animations to create pseudo-movies and this is what you see most often on your phone as advertisements while trying to read the news. These are so well done you do not even notice it is not a little movie: a static, sliding, or slightly enlarging background with a foreground banner sliding in, etc. This does not increase file size hardly at all, but requires a good knowledge of CSS. As for E-ink and so forth not being able to show these things, some of them do, others don't. The concept of 'book' is in an evolving state and there will be some day books which will include videos as a necessary integral part of the author's intent, not just a gee-whiz inclusion. You can add internal video in the calibre editor and the calibre viewer will play the video with sound absolutely correctly, but it will stall out when trying to use the ebook with this or that -- in fact -- most other commercial ebook readers. Best regards, Pop
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