<iframe id="ytplayer" type="text/html" width="640" height="360"
src="https://www.youtube.com/embed/M7lc1UVf-VE?autoplay=1&origin=http://example.com"
frameborder="0"></iframe><iframe class="embed-responsive-item"id="ytplayer" type="text/html" width="640" height="360" src="https://www.youtube.com/embed/M7lc1UVf-VE?&autoplay=1&loop=1&rel=0&showinfo=0&color=white&iv_load_policy=3&playlist=M7lc1UVf-VE"
frameborder="0" allowfullscreen></iframe>
// Add this to your URL
?autoplay=1&mute=1
// example
https://www.youtube.com/embed/9QTojZVR_Ec?autoplay=1&mute=1<iframe width="560" height="315" src="https://www.youtube.com/embed/videoseries?list=PLQGSXoAiT2W4W8D3397nl4OB_GxfOmJk9" allowfullscreen></iframe><iframe id="ytplayer" type="text/html" width="640" height="360"
src="http://www.youtube.com/embed/M7lc1UVf-VE?autoplay=1&origin=http://example.com"
frameborder="0"/>