Audio syncing issues are a very common, and distracting, problem in video production, whether you're filming a project for work or school or just a family gathering. It can be caused by any number of technical issues, but you don't need to be a technical person to solve the problem. All you need are sharp ears and a computer, and your video will have perfect sync in no time.
Step 1
Capture your footage onto a non-linear editing system (NLE). For camcorders based on hard drives or memory cards, the footage will be saved as clips, which can be dragged from your camcorder onto your NLE via a USB or firewire connection. For footage on tape, make sure the tape is fully rewound and play back the footage for the NLE while it is in capture mode. It should capture all the footage automatically.
Step 2
Scan the footage for a short, loud noise. Good examples would be a car door slamming, a firework exploding or a champagne cork popping. You are looking for a distinctive sound paired to a distinctive action.
Step 3
Separate the audio from the video by using the "Unlink" or "Separate" function found in the Edit menu of your NLE. Then locate the noise you're using and drag it to the exact moment the action that makes that noise happens on screen.
Step 4
Drop the noise at the exact moment the action happens in the video, and then play back the video. If it's not in perfect sync, you may have to move the audio one or two frames one way or the other to "lock in" the sync.
Step 5
Render the video either to your computer or back to your camera. Be sure to open the video once it's rendered to make sure your audio has stayed in sync.
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