When I play the video on my my Tablet there is no sound . However the sound has been set to maximum on iPad 4 with iOS 6.1.
Ensure that there are no issues while hearing any audio clip such as youtube etc on your iPad.
If other audio clips are playing the follow the steps below:
- Navigate to Settings on device.
- Choose General and then select the option called 'Lock Rotation' under the: 'Use Side Switch to:' heading.