// Muting and UnMuting the sound of our video.

step 1. Place a button on the stage from the component library.

step 2.Label it as "Mute". Name is as "mute_btn".

step 3. _root.getVolume return the current volume of our movie. So if  _root.getVolume>0 the we need to mute the movie else UnMute it.

//code will as follows

 mute_btn.onRelese=function()

{

 if(_root.getVolume==0)

{

 _root.setVolume=100;

mute_btn.label="Mute";

}

else

{

_root.setVolume=0;

 mute_btn.label="UnMute";

}

}