How to Sync Audio & Video in a Recorded Video
Often, when you want the best quality audio and video content, you record the video with one device and record the audio with a separate audio recorder. However, after you are done videotaping and recording the audio, you need to sync the two back together. In order to do this, you need the aid of a video editor. The software pre-installed on your Mac and PC is not capable of doing this. In order to sync the two media, you need a video editor that recognizes the audio and video as separate tracks.
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Instructions
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Record every take with a clapboard at the beginning of the shot. The clapboard produces a loud snapping sound. It is important for the video camera to record the clapboard (or slate) and the audio recording equipment to record the audio.
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Launch the video editing software on your computer. Once it loads, click "File" followed by "Import." Select the audio and video files you want to sync.
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Click and drag the audio track down into the timeline.
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Place an "In" point at the beginning of the timeline. For most video editing programs you can do this by pressing the "I" button on the keyboard. Move through the audio one frame at a time until you hear the loud pop of the slate cracking down. Place an "Out" point on the first frame of the loud cracking sound.
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Press the "Delete" button to remove the area in between the in and out marks. Now the first frame is the snapping noise from the slate.
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Pull down the video into the video timeline track. Lock the audio track (or de-select it) so all of the editing done to the video track does not effect the audio track.
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Place an "In" port at the beginning of the video file and move through the video until you come to the first full frame of the slate's clapper making contact with the actual state. Place an "Out" point here and push the "Delete" button to remove the video content selected. The audio and video are now synced up and flow with each other. When you export the file, it appears just like one fluid audio/video file.
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