HTML5 video tag not working

Can someone please explain why the following code does not work in a SmartTv?

<!DOCTYPE html>
<video src=“” id=“currentpic” width=“1920” height=“1080” muted autoplay controls/>

It’s about as basic as you can get with a video tag - does a video need to be local to be played? And if so, how do we do that with Tizen 4.0?