A video is commonly used as anything recorded. Footage 和 video 和有什么不一样？ a: Footage is commonly used on the news.
Clip is commonly used as part of a video, a minute or so.
A video is more likely to be anything that contains moving pictures like the ones which you watch on social media platforms. Synonym for image image is a picture that does not move. Pretty much the same thing. |i suppose a gif could be called footage, but footage is usually used for something more serious.
Footage is part of a video.
