My TV is a 65RU7100 - firmware 1356.
The HTML below works perfectly when running in the simulator. On TV, it successfully loads the video only occasionally (about 1 in 10 tries). I have tried loading and playing the video through javascript, but the issue persists.
I also have a program that uses AVPlay directly to play videos and I am getting the same problem. The videos almost never load. It looks like an underlying problem in AVPlay.
Simple HTML5 videos tested in the TV’s browser also do not work. Strangely, Youtube and Twitch works perfectly in the browser.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
<title>Test</title>
<link rel="stylesheet" type="text/css" href="css/style.css"/>
<script src="js/main.js"></script>
</head>
<body>
<video id="video" width="400">
<source src="http://media.w3.org/2010/05/sintel/trailer.mp4" type="video/mp4">
</video>
</body>
</html>