My TV is a 65RU7100 - firmware 1356.
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>