So recently I had solve an issue with a YouTube embed code, while I failed to solve it at first, I successfully figured out the solution later on. What I learned is quite useful, as long as you are looking for looped videos.
So front page of this thread actually gives info on looped videos however that information is no longer correct. So then how to loop videos? Easy! Let's take a look at the basic code, I'm gonna use the video from my previous post.
<iframe src="https://www.youtube.com/embed/mJE7mv5Tm1c?loop=1;playlist=mJE7mv5Tm1c" width="640" height="360" frameborder="0" allowfullscreen></iframe>
You see the difference is I added 2 commands. The first is the loop command itself so loop=1, the other is however necessary to make it actually loop, you need the video in a playlist, worry not! You don't have to actually create a playlist for this loop just add the Video's ID as playlist, in this case it's mJE7mv5Tm1c, it is also necessary to separate the two commands with a semicolon (;) and for god's sake do not mix it up with a greek question mark or your commands won't work. That alongside with an autoplay command can create a never ending soothing ambience or a complete nightmare, whichever you prefer. Anyway here's how a looped video looks like.