How to Embed a Video
When I say to add a bit of code to the end of the URL, you shoudl find where it says “youtube.com/embed/abc123” and put your new bits of code at the end of that. With the old embed code, there are two locations that such a thing is found, and you must place your code at the end of both URLs. Most of these commands only work with the old embed code, and I suggest that you use that one.
Forcing a Video to Start at a Specific Time
Add #t=?m?s to the end of the URL when embedding to force a youtube video to start at a specific number of minutes and seconds in, replacing the question marks with numbers, like so:
Making a Video Loop
Add &loop=1 to the end of the URL to force a video to loop. Like so:
Making a Video Autoplay
Do not do this on the forums. Or in a meme entry. Only on your wall.
Add the line &autoplay=1 to the end of the URL. I won’t be putting an example here, but I think you get the idea.
Making a Video Invisible
As you can see from this code,
<object width="425" height="349"><param name="movie" value="http://www.youtube.com/v/lgb6peaKCSc?version=3&hl=en_US&rel=0">
<param name="allowFullScreen" value="true">
<param name="allowscriptaccess" value="always">
<embed src="http://www.youtube.com/v/lgb6peaKCSc?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="425" height="349" allowscriptaccess="always" allowfullscreen="true"></embed></object>
…there is an option to change the frame width and height. Simply change each of these to 1 and the video will appear as a period, a small little black dot.