What do i do if the sound for my videos on my iphone is not working?

Whenever i make videos, there's no sound present. But when i record voicenotes, or listen to music the sound works, it just doesn't work for recording videos anymore. What is wrong?

It seems like the mic for the camera is broken and needs to be replaced, it usually happens from liquid damage.
Iphone 4/4s the mic is located at the top of the iphone it is a very tiny hole by the headphone jack.
iphone 5 it is next to the back camera

Sell iphone at: http://ibuybroken.com

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