I can set the ringer to Off and turn down the volume right away (on the side of the phone), then open a video that I've taken in the Camera Roll, and as soon as the video starts playing, the volume can blast me out (as it did a minute ago). Neither the ringer nor volume control lowered it. It's not until the video actually starts playing that I can lower it. God help me if it's set high - especially since I work in a very quiet office environment, and they hear anything out of the ordinary. I don't know if there's a way to make sure the volume doesn't blare everyone's ears off, but it would be nice to NOT have to rush to turn it down once it's started.