Sometimes we record in a noisy environment. We can re-record the audio, but it can be hard as well as time-consuming. This tutorial will show you how to quickly remove noise from audio/video.
Step 1: Separate audio track from video. You can use freeware like Format Factory for this.
Step 2: Download and install Audacity.
Step 3: Open audio file in Audacity by pressing Ctrl + O.
Step 4: Find a part of audio where only noise is present, actual audio is absent. You may find a single second of noise. Select that portion.
Step 5: Go to Effect > Noise removal and click “Get Noise Profile”.
Step 6: Select whole audio or part of the audio track from which you want to remove noise.
Step 7: Go to Effect > Noise removal and adjust less or more slider listening preview every time. Select best position where noise has been removed though actual audio is clear.
Step 8: Click “Remove Noise”.
You will get such noise filtered audio output which you can export from file menu. Replace audio track of video using windows live movie maker or virtualdub.
Hope that works!