Adding the ability to mute files in the video player while in the mobile app.

Right now there doesn't seem to be a way to mute the video player without turning off the volume of the device in the mobile app.

I often want to look at some video files (that don't actually have any audio) while listening to some music. But the app essentially forces me to pause my music so that the video can play in the app. 

A mute function shouldn't be too difficult to implement and would improve quality of life.