YouTube: How to present embed video with sound muted

Question

I'm trying to embed a video with the sound muted but I can not figure out how it make it work.

Currently I'm using this but doesn't work:

<iframe src="https://www.youtube.com/embed/uNRGWVJ10gQ?rel=0&amp;autoplay=1" width="560" height="315" frameborder="0" allowfullscreen></iframe> 

Any of you knows how can I make this work ?

Answer 1

Updated

Add &mute=1 to the end of your url.

Your new code would be:

<iframe src="https://www.youtube.com/embed/uNRGWVJ10gQ?rel=0&amp;autoplay=1&mute=1" width="560" height="315" frameborder="0" allowfullscreen></iframe>

Answer 2

For me works using &autoplay=1&mute=1