When Media Viewer is enabled, is it unable to play diaporamas (slideshows) in sequence at this time. Currently Media Viewer requires clicking from slide-to-slide, removing the animation ability. Having this ability will enhance the usefulness of the many slideshows that are used for demonstrating many aspects of physics and mathematics related articles.
Example from the French Wikipedia: https://fr.wikipedia.org/wiki/Th%C3%A9orie_des_graphes#mediaviewer/Fichier:Gnome-media-playback-start.svg/31
See Also:
T128429: Provide an rotating reader-interactive "slider" gallery mode
T7383: Inline slideshows