Use an external microphone
The native microphone on your phone will capture audio of good quality if you are less than one meter from your subject, but you will get better results with an external microphone. There are plenty of options – from clip-microphones to handheld to wireless systems, and we have many recommendations in our Equipment chapter.
If you don’t have an external microphone, the headset of an iPhone or high-quality Android phone will record acceptable audio. If you need to do this, try to work indoors and don’t record in windy locations.
Attaching a clip microphone
Clip microphones should be attached so that the microphone is about 20cm from your interviewee’s mouth. Record a short test video and listen back on headphones to make sure the voice is audible, and that it is not so close to the mouth as to be distorted by ‘popping’ sounds.
Using a handheld microphone
If you are using a handheld microphone, hold it very still if it is going to be visible in the shot or consider a two-shot so that both you and your interviewee are in frame. Use a windshield to protect your microphone from wind noise.
Capturing natural sound
When you finish an interview, keep the camera running and record 60 seconds of natural sound on location. This audio will help you transition from one shot to another when you come to edit your video.
This tutorial from BBC mobile journalism trainer Marc Blank-Settle has excellent advice on recording great audio for your story.