Voting Question: How to put videos on forums/post?

How to put videos on forums/post?
How to put videos on forums/post?
How do people put videos on forums or post that auto play and repeat and it doesn't have any frame on it. Not like youtube videos but like on forums I saw the video thingy that kept replaying and autoplaying, I copied the video link thingy and it was from tinypic. But when I uploaded a short clip and posted it on a blog or something it had a back frame around it and you had to click play, then it didn't repeat autoly.