Protoze to spusti tim "run" - zkuste si ulozit jen samotne html s video tagem - funkcni minimalizmus, ve FF hraje, v Chromem az po kliknuti do okna s videem:
<html>
<body>
<video width="400" autoplay controls>
<source src="https://www.w3schools.com/htmL/mov_bbb.mp4" type="video/mp4">
<source src="https://www.w3schools.com/htmL/mov_bbb.ogg" type="video/ogg">
</video>
</body>
</html>
FF hraje, Chrome 67 ne: