No sound when playing iphone video?

Last night i went to a concert and took a bunch of videos, when i played then back today the it plays the video but not the audio. I tried restarting the phone and putting the pictures on the computer but that didn't work. I really want to keep these video can anyone help

I sometimes have this problem too on my iPhone 5s. I usually just put in head phones and it works, but I think if you put headphones in, resume play, and pull them out it normally has sound again.

Hope this helps!

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