Steps to reproduce:
- go to a category on Commons with a video, such as https://commons.wikimedia.org/wiki/Category:Wikimania_2014_videos
- click on a video with sound (in the aforementioned category, the first video Clay_Shirky.webm has sound)
- click the close button on the top right of the video that appears
- The window closes and no sound is playing anymore.
- The window closes, but sound keeps playing until I click on another video.
Sorry if this isn't tagged the right way, I didn't know what component this is.