IPhone 4 hasn't been playing audio?

As of late The audio hasn't been functioning on my iPhone 4; this has been the case with both the videos in my camera and with videos online.

The volume control bar disappears entirely on internet videos, and the volume control meter doesn't even come up if I try to turn the sound up on a camera video.

What might be the problem, and how might I fix it?

Take it to Apple shop

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