Error message "No compatible source was found for this video"

If you read the error message "No compatible source was found for this video" you use seem to use an outdated browser (for example Internet Explorer 11 on Windows 7).

This browser does not support all necessary HTML5 functionality for our video application.

Please update either your operation system to Windows 10 or install a modern browser like Mozilla Firefox  or Google Chrome.

You may switch temporarily to our old flash based web application in your profile settings (not recommended, requries the installation of Adobe Flash!)