If you are seeing the error Error loading player: No playable sources found when viewing the graduation live stream this is due to Flash player not being enabled in your browser.
How to enable Flash
Click on the padlock on the address bar next to https://www.liverpool.ac.uk/graduation/the_ceremony/live-webcast/ and click on Site settings in the dropdown menu.
Next to the Flash plugin select Allow from the dropdown.
Close the tab and you will be asked to reload the browser. Click on the blue Reload button.
The video will now start to play.
Click on Run Adobe Flash that appears in the player window
A popup will appear in the upper-left of the browser near to the address bar. Click the blue Allow button.
The video will start to play.