Let me help you with this.
I would like to get more information about your system configuration so I can have a clear picture of the issue.
Can you please provide your dxdiag report here?
How to get it?
Dxdiag Report: Type dxdiag in Start Menu> open> Save> Attach using Advanced Editor Options.
Can you also provide a link as an example of the embedded video you are trying to play?
Kevin M