It's supposed to just work in Chrome. Do you have any unusual extensions in use that may be relevant? I also assume the desktop is reasonably powerful ... If you are seeing the "stalled" message showing up, it usually means that either the network can't deliver the video, or the browser can't accept the video fast enough.
Do you have a laptop or anything else running Chrome that you could try with to see if the problem is specific to the one desktop, or occurs across the board?
If none of the above seem to apply, "Report Bug" (from the dropdown you get if you click the profile pic at the top right) and click all of the checkboxes so that both browser and device logs are sent so that we can get some more information about what could be going wrong.