Video recoding external microphone doesn’t work

Hello, km195. Thank you for posting to the Apple Support Communities. 

We know that you rely on your iPhone to work normally when you create new videos and we can certainly help you research this microphone issue. 

From what we gather, you are noticing that audio is missing from your recorded videos after using the built-in microphones with your device. There could be several reasons why this may happen and we’re happy to go over the suggested troubleshooting steps with you. 

To start, we’d like to provide you with an Apple Support article. This article explains which steps you should try first if you are noticing that the microphones in your iPhone are not working as expected: 

If the microphones on your iPhone aren't working - Apple Support

If you continue to notice the same issue after this, we can help you more. To continue, can you tell us how your microphones work in the Voice Memos app, or when making a phone call? 

We look forward to your reply, and to helping you find a solution. 

Cheers! 

Thank you for replying back, km195. 

We understand that audio is recorded normally when you use the Voice Memos app and that this only seems to be an issue when you record video with the Camera app. We have several more questions to help us gain a better understanding of the situation. 

From what we gather, you are using a connected external microphone. Is that correct? If so, can you tell us how you connect the microphone to your iPhone? Is the microphone wireless, or does it connect to your iPhone with a cable? 

Can you also tell us if you notice the same issue when recording video using the built-in microphones of your device? 

We’ll talk to you soon. 

Have a great day!