Handheld.PlayFullScreenMovie not playing sound

My movie’s video plays, but no audio. It’s got audio in the mp4 file for sure. Volume is ‘up’. Thinking maybe a codec issue? What’s the proper codec for iOS? Using 5.2.1p1, XCode7, iOS 9, iPhone 5 (so far)

We’re experiencing the same issue with Unity 4.6.9 il2cpp, ios, and only on one device out of many we’ve tested.

Are you downloading the video from a server or trying to run it locally from streaming assets?

We’re loading a .MOV video from a server and we’ve had instances where the device it wasn’t working on, a week later, the same build and everything, works when they try to run it again.

Currently it’s working on my ipad 4, iphone 5c, iphone 5s, and it doesn’t work on an ipad mini(16gb), while the video plays just fine…just without any audio…