Good morning, I'm creating a website and in one page I put the following code

<video width="450" height="450"controls>
    <source src="Video/Video1.mp4" type="video/mp4">

or using youtube:

<iframe width="560" height="315" src="" frameborder="0" allowfullscreen></iframe>

I can see the videos in chrome, firefox, explorer and so on, except SAFARI. Can someone help me to solve these problems? or can someone send me an example code, which works correctly on all browers?

Thank you really much
Best Regards