Videos not getting mute when running a game

[Former user]

In the latest stable of BigBox, sometimes when I start a game, the audio on the preview video, keeps playing.

Despite the emulator used (Retroarch, Mame, Dolphin) whenever I start a game, sometimes the audio of the video doesn't stop.

So the game runs, with the audio of the video in the background.

I'm using Windows 8.1 and Windows Media Player as the video Backend.