My sound on Iphone 4 doesn't work?

So a few minutes ago i tried to record one video, and when i play it it didn't have sound but my phone is not on mute and when I play older video it does have sound… Can somebody help me?

1. Recharge fully 100 percent 2. Try again 3. Turn off and on. 4. There's volume buttons on the side adjust those.

You have to change your speaker.

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