Vidéoclips is the short movies on music that you can see on mtv
Capsules vidéos is a most generic expression meaning a short video. It is most often use to speak of a corporate video or a short video on the web. Capsules is used for the «short» aspect of the thing, beside the most cinematographical expression «short-movie». Maybe capsule video is an expression used most in Quebec.
(sorry for my bad english)
Now : how can I translate capsule in english?