Recording good audio is very tricky, here are a couple quick tips to help make recording audio a bit easier.
Use a quality microphone
The internal microphones attached to camcorders and phones are usually not the best quality. Lavaliere microphones, or lapel mic, are versatile and better suited for general-purpose use. Shotgun microphones are suited for recording audio directly in front of the microphone. Handheld microphones are more of a wide-angle mic as it captures audio from a wide pattern in front of the camera.
Monitor the Sound
Keep an eye on your right and left recording channels, that they are both recording. Check that your peak level isn't to high, and most importantly put headphones in, and listen to what your microphone is hearing.
Limit Background Noise
Try to limit any noise you wouldn't want the microphone to pick up. Hums of refrigerators, A/C, heaters, traffic etc. It may not seem very loud or distracting when out in the field filming, but when you get into the edit suite you'll be grateful you blocked out the background noise!
Record Background Noise
Always do this, you may not be able to hear what the microphone picks up until you get into the edit suite. If you record background noise, you will be able to remove it from your audio recording easier in edit.
We aren't only talking about removing the sounds you don't want to hear, but the things you do expect to hear. If your in a crowded mall you expect a bit of background chatter, if your around animals you expect them to make noises. This type of background noise will make your viewers feel like they are right there in that scene.
Watch Out For Wind
Wind can very easily ruin audio recording. Try blocking it out if you can't avoid it.
Record It Later
If you can't avoid wind, or background noise, but you want a crisp clear audio recording, record the clean audio later. If your in field and your actors are talking record the audio and replace it after with the clean version. Recording the audio in the field will make it easier to match the clean version in the edit suite.
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